Esempio n. 1
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def plot_GraphAnalysis():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    graph.to_core()
    graph.analysis.plot(show=False)
    os.remove(path)
    return True
Esempio n. 2
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    def __init__(self, label, edges, w, z, **kwargs):
        if not hasattr(w, '__len__'):
            w = [
                w,
            ]
        if not hasattr(z, '__len__'):
            z = [
                z,
            ]
        assert len(w) == len(z),\
            'len(z)={0!s} is not equal to len(w)={1!s}.'.format(len(z), len(w))
        # init PortHamiltonianObject
        Graph.__init__(self, label=label)
        # build correspondance between labels in subs and pars (dicpars)...
        # ... and build the correspondance between symbols and subs (subs)
        dicpars, subs = mappars(self, **kwargs)
        # update dict of subs in phs
        self.core.subs.update(subs)
        # replace parameters in z by correspondances in 'dicpars'
        for i, zz in enumerate(z):
            z[i] = zz.subs(dicpars)
        for e, edge in enumerate(edges):
            if 'z' in edge[2].keys():
                for k in ['e_ctrl', 'f_ctrl']:
                    edges[e][2]['z'][k] = edge[2]['z'][k].subs(dicpars)

        # add dissipative component
        self.core.add_dissipations(w, z)
        # update phs.Graph with edges
        self.add_edges_from(edges)
Esempio n. 3
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def split_sp():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    print(graph.edges(data=True))
    graph.split_sp()
    os.remove(path)
    return True
Esempio n. 4
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def split_sp():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    print(graph.edges(data=True))
    graph.split_sp()
    os.remove(path)
    return True
Esempio n. 5
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 def __init__(self, label, nodes, **kwargs):
     Graph.__init__(self, label=label)
     if not isinstance(kwargs['value'], Argument):
         coeff = Argument(label + 'coeff', kwargs['value'])
     else:
         coeff = kwargs['value']
     x = nicevarlabel("x", label)
     x = self.core.symbols(x)
     if kwargs['inv_coeff']:
         coeff.symb = coeff.symb**-1
     H = coeff.symb * x**2 / 2.
     self.core.add_storages([x], H)
     edge_data_dic = {
         'label': x,
         'type': 'storage',
         'ctrl': kwargs['ctrl'],
         'link': None
     }
     edge = (nodes[0], nodes[1], edge_data_dic)
     self.add_edges_from([edge])
     self.core.subs.update(coeff.sub)
     if len(coeff.sub) == 0 and kwargs['inv_coeff']:
         self.core.p += [
             coeff.symb**-1,
         ]
     elif len(coeff.sub) == 0:
         self.core.p += [
             coeff.symb,
         ]
Esempio n. 6
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def plot_GraphAnalysis():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    graph.buildCore()
    graph.analysis.plot(show=False)
    os.remove(path)
    return True
Esempio n. 7
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    def __init__(self, label, edges, w, z, **kwargs):
        if not hasattr(w, '__len__'):
            w = [w, ]
        if not hasattr(z, '__len__'):
            z = [z, ]
        assert len(w) == len(z),\
            'len(z)={0!s} is not equal to len(w)={1!s}.'.format(len(z), len(w))
        # init PortHamiltonianObject
        Graph.__init__(self, label=label)
        # build correspondance between labels in subs and pars (dicpars)...
        # ... and build the correspondance between symbols and subs (subs)
        dicpars, subs = mappars(self, **kwargs)
        # update dict of subs in phs
        self.core.subs.update(subs)
        # replace parameters in z by correspondances in 'dicpars'
        for i, zz in enumerate(z):
            z[i] = zz.subs(dicpars)
        for e, edge in enumerate(edges):
            if 'z' in edge[2].keys():
                for k in ['e_ctrl', 'f_ctrl']:
                    edges[e][2]['z'][k] = edge[2]['z'][k].subs(dicpars)

        # add dissipative component
        self.core.add_dissipations(w, z)
        # update phs.Graph with edges
        self.add_edges_from(edges)
Esempio n. 8
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File: port.py Progetto: yomguy/pyphs
    def __init__(self, label, nodes, **kwargs):

        # update default parameters
        parameters = {'ctrl': '?', 'const': None}
        parameters.update(kwargs)

        Graph.__init__(self, label=label)
        # set starting node to datum if not provided
        if nodes.__len__() == 1:
            node1 = datum
            node2 = nodes[0]
        elif nodes.__len__() == 2:
            node1 = nodes[0]
            node2 = nodes[1]
        # define symbols
        u, y = symbols((nicevarlabel('u', label),
                        nicevarlabel('y', label)))
        # add port to phs
        self.core.add_ports([u], [y])
        # check edge control type (dual of input control type in values[0])
        assert parameters['ctrl'] in ('e', 'f', '?')
        # define edge data
        edge_data = {'label': y,
                     'type': 'port',
                     'ctrl': parameters['ctrl'],
                     'link': None}
        # add edge to phs.Graph
        self.add_edges_from([(node1, node2, edge_data)])
        # check if constant value is provided
        if parameters['const'] is not None:
            self.core.subs.update({u: parameters['const']})
Esempio n. 9
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    def __init__(self, label, nodes, **kwargs):

        Graph.__init__(self, label=label)
        if not isinstance(kwargs['coeff'], Argument):
            coeff = Argument(label + 'coeff', kwargs['coeff'])
        else:
            coeff = kwargs['coeff']
        w_label = nicevarlabel("w", label)
        w = self.core.symbols(w_label)
        z_f_ctrl = coeff.symb * w
        z_e_ctrl = w / coeff.symb
        if 'inv_coeff' in kwargs and kwargs['inv_coeff']:
            z_f_ctrl, z_e_ctrl = z_e_ctrl, z_f_ctrl
        self.core.add_dissipations([w], [z_f_ctrl])
        edge_data_dic = {
            'label': w,
            'type': 'dissipative',
            'ctrl': '?',
            'z': {
                'e_ctrl': z_e_ctrl,
                'f_ctrl': z_f_ctrl
            },
            'link': None
        }
        edge = (nodes[0], nodes[1], edge_data_dic)
        self.add_edges_from([edge])
        self.core.subs.update(coeff.sub)
        if len(coeff.sub) == 0:
            self.core.p += [
                coeff.symb,
            ]
Esempio n. 10
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 def __init__(self, label, edges, **kwargs):
     # init PortHamiltonianObject
     Graph.__init__(self, label=label)
     # build correspondance between labels in subs and pars (dicpars)...
     # ... and build the correspondance between symbols and subs (subs)
     dicpars, subs = mappars(self, **kwargs)
     # update dict of subs in phs
     self.core.subs.update(subs)
     # update phs.Graph with edges
     self.add_edges_from(edges)
Esempio n. 11
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def TestCore2Tex():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    core = graph.to_core()
    content = netlist2tex(netlist)
    content += graphplot2tex(graph)
    content += core2tex(core)
    texdocument(content, path, title='test core2tex')
    os.remove(path)
    return True
Esempio n. 12
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    def __init__(self, label, nodes, **kwargs):

        # instanciate a Graph object
        Graph.__init__(self, label=label)

        path = kwargs.pop('file')
        data = np.vstack(map(np.array, data_generator(path)))
        w_vals = data[0, :]
        z_vals = data[1, :]

        assert all(z_vals[np.nonzero(w_vals >= 0)] >= 0), 'All values z(w) for\
 w>=0 must be non-negative (component {})'.format(label)

        assert all(z_vals[np.nonzero(w_vals < 0)] < 0), 'All values z(w) for\
 w<0 must be negative (component {})'.format(label)

        assert all(z_vals[np.nonzero(w_vals == 0)] == 0), 'z(0) must be zero \
(component {})'.format(label)

        assert all(np.diff(z_vals) > 0), "z'(0) must be positive\
(component {})".format(label)

        ctrl = kwargs.pop('ctrl')

        # state  variable
        w = symbols("w" + label)
        # dissipative funcion
        z = pwl_func(w_vals, z_vals, w, **kwargs)

        if ctrl == 'e':
            not_ctrl = 'f'
        else:
            assert ctrl == 'f'
            not_ctrl = 'e'

        # edge data
        data = {
            'label': w,
            'type': 'dissipative',
            'ctrl': ctrl,
            'z': {
                ctrl + '_ctrl': z,
                not_ctrl + '_ctrl': sp.sympify(0)
            },
            'link': None
        }
        N1, N2 = nodes

        # edge
        edge = (N1, N2, data)

        # init component
        self += edges.DissipativeNonLinear(label, [
            edge,
        ], w, z, **kwargs)
Esempio n. 13
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    def __init__(self, label, nodes, **kwargs):

        Graph.__init__(self, label=label)

        pars = parameters_JSV2016()
        pars.update(kwargs)
        Ccoil = float(pars.pop('Ccoil'))
        Ncoil = float(pars.pop('Ncoil'))

        # remove H0
        pars.pop('H0')
        dicpars, subs = mappars(self, **pars)

        # parameters
        pars = ['Rb', 'Rp', 'Lh', 'Lv']
        Rb, Rp, Lh, Lv = self.core.symbols(pars)

        # nodes
        MASS, ELEC1, ELEC2 = nodes
        NMagnet = 'N' + label + 'Magnet'
        NCcoil = 'N' + label + 'Ccoil'

        self += Source(
            label + 'Magnet',
            (self.datum, NMagnet),
            **{
                'type': 'mmf',
                #                          'const': H0,
            })

        MASS_obs = Observerec(label + 'OBS', (self.datum, MASS))
        self += MASS_obs
        q, dtq = MASS_obs.core.o()

        def f(q, dtq):
            """
            cf JSV Rhodes eq (25)
            set dmu = (murel-1)/(murel + 1) to 1
            """
            dmu = 1
            f1 = (q - Rp + Lv)**2 + Lh**2
            f2 = (q + Rp + Lv)**2 + Lh**2
            return 2 * Rb**2 * dmu * Rp * ((f1 - 2 * Lh**2) / f1**2 -
                                           (f2 - 2 * Lh**2) / f2**2) * dtq

        falpha = (f(q, dtq)**-1).subs(dicpars)
        self += Gyrator(label + 'MecToMag',
                        (self.datum, NCcoil, self.datum, NMagnet),
                        alpha=(label + 'f', falpha))
        self += Capacitor(label + 'Ccoil', (self.datum, NCcoil), C=Ccoil)
        self += Gyrator(label + 'MagToElec',
                        (self.datum, NCcoil, ELEC1, ELEC2),
                        alpha=(label + 'Ncoil', Ncoil))
        self.core.subs.update(subs)
Esempio n. 14
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    def __init__(self, label, nodes, **kwargs):

        Graph.__init__(self, label=label)

        pars = parameters_JSV2016()
        pars.update(kwargs)
        Ccoil = float(pars.pop('Ccoil'))
        Ncoil = float(pars.pop('Ncoil'))

        # remove H0
        pars.pop('H0')
        dicpars, subs = mappars(self, **pars)

        # parameters
        pars = ['Rb', 'Rp', 'Lh', 'Lv']
        Rb, Rp, Lh, Lv = self.core.symbols(pars)

        # nodes
        MASS, ELEC1, ELEC2 = nodes
        NMagnet = 'N' + label + 'Magnet'
        NCcoil = 'N' + label + 'Ccoil'

        self += Source(label+'Magnet',
                       (self.datum, NMagnet),
                       **{'type': 'mmf',
#                          'const': H0,
                          })

        MASS_obs = Observerec(label+'OBS', (self.datum, MASS))
        self += MASS_obs
        q, dtq = MASS_obs.core.o()

        def f(q, dtq):
            """
            cf JSV Rhodes eq (25)
            set dmu = (murel-1)/(murel + 1) to 1
            """
            dmu = 1
            f1 = (q - Rp + Lv)**2 + Lh**2
            f2 = (q + Rp + Lv)**2 + Lh**2
            return 2*Rb**2*dmu*Rp*((f1-2*Lh**2)/f1**2 -
                                   (f2-2*Lh**2)/f2**2) * dtq

        falpha = (f(q, dtq)**-1).subs(dicpars)
        self += Gyrator(label+'MecToMag',
                        (self.datum, NCcoil, self.datum, NMagnet),
                        alpha=(label+'f', falpha))
        self += Capacitor(label+'Ccoil',
                          (self.datum, NCcoil),
                          C=Ccoil)
        self += Gyrator(label+'MagToElec',
                        (self.datum, NCcoil, ELEC1, ELEC2),
                        alpha=(label+'Ncoil', Ncoil))
        self.core.subs.update(subs)
Esempio n. 15
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 def __init__(self, label, edges, x, H, **kwargs):
     # init PortHamiltonianObject
     Graph.__init__(self, label=label)
     # build correspondance between labels in subs and pars (dicpars)...
     # ... and build the correspondance between symbols and subs (subs)
     dicpars, subs = mappars(self, **kwargs)
     # update dict of subs in phs
     self.core.subs.update(subs)
     # replace parameters in H by correspondances in 'dicpars'
     H = H.subs(dicpars)
     # add dissipative component
     self.core.add_storages(x, H)
     # update phs.Graph with edges
     self.add_edges_from(edges)
Esempio n. 16
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def TestCore2Tex():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    core = graph.to_core()
    folder = os.path.join(here, 'temp')
    if not os.path.exists(folder):
        os.mkdir(folder)
    path = os.path.join(folder, 'test_core2tex.tex')
    content = netlist2tex(netlist)
    content += graphplot2tex(graph, folder=folder)
    content += core2tex(core)
    texdocument(content, path, title='test core2tex')
    shutil.rmtree(folder)
    return True
Esempio n. 17
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 def __init__(self, label, edges, x, H, **kwargs):
     # init PortHamiltonianObject
     Graph.__init__(self, label=label)
     # build correspondance between labels in subs and pars (dicpars)...
     # ... and build the correspondance between symbols and subs (subs)
     dicpars, subs = mappars(self, **kwargs)
     # update dict of subs in phs
     self.core.subs.update(subs)
     # replace parameters in H by correspondances in 'dicpars'
     H = H.subs(dicpars)
     # add dissipative component
     self.core.add_storages(x, H)
     # update phs.Graph with edges
     self.add_edges_from(edges)
Esempio n. 18
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        dic = {
            'A': 1e2,  # [N.s/m] Felt damping coefficient
            'B': 2.5,  # [#] Hysteresis coefficient for the felt
            'F': 13.8,  # [N/m] Elastic characteristic force
            'L': 1.5 * 1e-2,  # [m] Height of the felt at rest
        }
        dic.update(kwargs)
        dicpars, subs = mappars(self, **dic)
        # parameters
        pars = ['L', 'F', 'A', 'B']
        L, F, A, B = symbols(pars)

        N1, N2 = nodes
        xnl = symbols('q' + label)
        hnl = sp.Piecewise((0., xnl <= 0.),
                           ((L * F / (B + 1)) * (xnl / L)**(B + 1), True))
        hnl = hnl.subs(dicpars)
        # edge data
        data = {'label': xnl, 'type': 'storage', 'ctrl': 'e', 'link': None}
        self.add_edges_from([
            (N1, N2, data),
        ])
        self.core.add_storages(xnl, hnl)

        r = sp.Piecewise((0., xnl <= 0.),
                         ((A * L / B) * (xnl / L)**(B - 1), True))
        r = r.subs(dicpars)
        wnl = symbols('dtq' + label)
        # edge data
        data = {
            'label': wnl,
            'type': 'dissipative',
            'ctrl': 'e',
            'z': {
                'e_ctrl': r * wnl,
                'f_ctrl': sp.sympify(0)
            },
            'link': None
        }
        self.add_edges_from([
            (N1, N2, data),
        ])
        self.core.add_dissipations(wnl, r * wnl)

        self.core.subs.update(subs)
Esempio n. 19
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    def __init__(self, label, nodes, **kwargs):

        # instanciate a Graph object
        Graph.__init__(self, label=label)

        assert 'file' in kwargs, "pwl.storage component need 'file' argument"
        path = kwargs.pop('file')
        vals = np.vstack(map(np.array, data_generator(path)))
        x_vals = vals[0, :]
        h_vals = vals[1, :]

        assert all(h_vals[np.nonzero(x_vals >= 0)] >= 0), 'All values h(x) for\
 x>=0 must be non-negative (component {})'.format(label)

        if kwargs['integ']:
            assert all(h_vals[np.nonzero(x_vals < 0)] < 0), 'All values dxh(x)\
 for x<0 must be negative (component {})'.format(label)
        else:
            assert all(h_vals[np.nonzero(x_vals < 0)] >= 0), 'All values h(x)\
 for x<0 must be non-negative (component {})'.format(label)

        assert h_vals[np.nonzero(x_vals == 0)] == 0, 'dxh(0) and h(0) must be \
zero (component {})'.format(label)

        ctrl = kwargs.pop('ctrl')

        # state  variable
        x = symbols("x" + label)
        # storage funcion
        h = pwl_func(x_vals, h_vals, x, **kwargs)

        # edge data
        data = {
            'label': x,
            'type': 'storage',
            'ctrl': ctrl,
            'file': path,
            'link': None
        }
        N1, N2 = nodes

        # edge
        edge = (N1, N2, data)

        # init component
        self += edges.StorageNonLinear(label, [edge], x, h, **kwargs)
Esempio n. 20
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'alpha' not in kwargs:
            alpha = 0.5
        else:
            alpha = kwargs.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(p, alpha, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        N1 = Ndeb
        for n in range(nbPoles):
            if n < nbPoles-1:
                N2 = 'N'+label+str(n)+"_1"
            else:
                N2 = Nend
            Rn = diagR[n]  # here, diagR[n] is a res (flux-controlled)            
            self += DissipativeLinear(label+'R'+str(n),
                                         (N2, N1),
                                         ctrl='f',
                                         coeff=Rn,
                                         inv_coef=False)

            Qn = diagQ[n]
            N3 = 'N'+label+str(n)+"_2"
            self += StorageLinear(label+'Q'+str(n),
                                     (N3, datum),
                                     value=Qn,
                                     inv_coeff=False,
                                     ctrl='e')

            Nend = nodes[1]
            self += Transformer(label+'alpha'+str(n),
                                (N1, N2, N3, datum),
                                alpha=Rn)
            N1 = N2
Esempio n. 21
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File: _felt.py Progetto: pyphs/pyphs
    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        parameters = parametersDefault(self.metadata['parameters'])
        parameters.update(kwargs)

        dicpars, subs = mappars(self, **parameters)
        # parameters
        pars = ['L', 'F', 'A', 'B']
        L, F, A, B = symbols(pars)

        N1, N2 = nodes
        xnl = symbols('q' + label)
        hnl = sp.Piecewise((0., xnl <= 0.),
                           ((L * F / (B + 1)) * (xnl / L)**(B + 1), True))
        hnl = hnl.subs(dicpars)
        # edge data
        data = {'label': xnl, 'type': 'storage', 'ctrl': 'e', 'link': None}
        self.add_edges_from([
            (N1, N2, data),
        ])
        self.core.add_storages(xnl, hnl)

        r = sp.Piecewise((0., xnl <= 0.),
                         ((A * L / B) * (xnl / L)**(B - 1), True))
        r = r.subs(dicpars)
        wnl = symbols('dtq' + label)
        # edge data
        data = {
            'label': wnl,
            'type': 'dissipative',
            'ctrl': 'e',
            'z': {
                'e_ctrl': r * wnl,
                'f_ctrl': sp.sympify(0)
            },
            'link': None
        }
        self.add_edges_from([
            (N1, N2, data),
        ])
        self.core.add_dissipations(wnl, r * wnl)

        self.core.subs.update(subs)
Esempio n. 22
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    def __init__(self, label, nodes, **kwargs):

        # instanciate a Graph object
        Graph.__init__(self, label=label)

        assert 'file' in kwargs, "pwl.storage component need 'file' argument"
        path = kwargs.pop('file')
        vals = np.vstack(map(np.array, data_generator(path)))
        x_vals = vals[0, :]
        h_vals = vals[1, :]

        assert all(h_vals[np.nonzero(x_vals >= 0)] >= 0), 'All values h(x) for\
 x>=0 must be non-negative (component {})'.format(label)

        if kwargs['integ']:
            assert all(h_vals[np.nonzero(x_vals < 0)] < 0), 'All values dxh(x)\
 for x<0 must be negative (component {})'.format(label)
        else:
            assert all(h_vals[np.nonzero(x_vals < 0)] >= 0), 'All values h(x)\
 for x<0 must be non-negative (component {})'.format(label)

        assert h_vals[np.nonzero(x_vals == 0)] == 0, 'dxh(0) and h(0) must be \
zero (component {})'.format(label)

        ctrl = kwargs.pop('ctrl')

        # state  variable
        x = symbols("x"+label)
        # storage funcion
        h = pwl_func(x_vals, h_vals, x, **kwargs)

        # edge data
        data = {'label': x,
                'type': 'storage',
                'ctrl': ctrl,
                'link': None}
        N1, N2 = nodes

        # edge
        edge = (N1, N2, data)

        # init component
        self += edges.StorageNonLinear(label, [edge], x, h, **kwargs)
Esempio n. 23
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'alpha' not in kwargs:
            alpha = 0.5
        else:
            alpha = kwargs.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(p, alpha, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        for n in range(nbPoles):

            Rn = diagR[n]  # here, diagR[n] is a conductance (e-ctrl)

            N1 = 'N'+label+str(n)+"_1"
            N2 = 'N'+label+str(n)+"_2"
            self += DissipativeLinear(label+'R'+str(n),
                                         (N1, Ndeb),
                                         inv_coeff=True,
                                         coeff=Rn,
                                         ctrl='e')
            
            
            
            Qn = diagQ[n]
            self += StorageLinear(label+'Q'+str(n),
                                     (N2, datum),
                                     value=Qn,
                                     ctrl='f',
                                     inv_coeff=False)

            self += Transformer(label+'alpha'+str(n),
                                (N1, Nend, N2, datum),
                                alpha=Rn**-1)
Esempio n. 24
0
    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'alpha' not in kwargs:
            alpha = 0.5
        else:
            alpha = kwargs.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(p, alpha, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        N1 = Ndeb
        for n in range(nbPoles):
            if n < nbPoles - 1:
                N2 = 'N' + label + str(n) + "_1"
            else:
                N2 = Nend
            Rn = diagR[n]  # here, diagR[n] is a res (flux-controlled)
            self += DissipativeLinear(label + 'R' + str(n), (N2, N1),
                                      ctrl='f',
                                      coeff=Rn,
                                      inv_coef=False)

            Qn = diagQ[n]
            N3 = 'N' + label + str(n) + "_2"
            self += StorageLinear(label + 'Q' + str(n), (N3, datum),
                                  value=Qn,
                                  inv_coeff=False,
                                  ctrl='e')

            Nend = nodes[1]
            self += Transformer(label + 'alpha' + str(n), (N1, N2, N3, datum),
                                alpha=Rn)
            N1 = N2
Esempio n. 25
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)

        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'beta' not in kwargs:
            beta = 0.5
        else:
            beta = kwargs.pop('beta')

        self.core.subs.update({self.core.symbols('p_'+label): p,
                               self.core.symbols('beta_'+label): beta})

        diagRmu, diagQmu = fractionalIntegratorWeights(p, beta, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagRmu.__len__()

        for n in range(nbPoles):
            Rn = diagRmu[n]  # here, diagRmu[n] is a resistance (f-ctrl)
            Nend = nodes[1]
            Ncomp = 'iN_'+label + str(n)
            comp = DissipativeLinear('R_'+label+str(n),
                                            (Ncomp, Nend),
                                            coeff=Rn,
                                            ctrl='f')
            self += comp

            Qn = diagQmu[n]
            Ndeb = nodes[0]
            comp = StorageLinear(label+str(n),
                                        (Ndeb, Ncomp),
                                        value=Qn,
                                        name='pL_',
                                        inv_coeff=False,
                                        ctrl='e')
            self += comp
Esempio n. 26
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)

        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'beta' not in kwargs:
            beta = 0.5
        else:
            beta = kwargs.pop('beta')

        self.core.subs.update({
            self.core.symbols('p_' + label): p,
            self.core.symbols('beta_' + label): beta
        })

        diagRmu, diagQmu = fractionalIntegratorWeights(p, beta, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagRmu.__len__()

        for n in range(nbPoles):
            Rn = diagRmu[n]  # here, diagRmu[n] is a resistance (f-ctrl)
            Nend = nodes[1]
            Ncomp = 'iN_' + label + str(n)
            comp = DissipativeLinear('R_' + label + str(n), (Ncomp, Nend),
                                     coeff=Rn,
                                     ctrl='f')
            self += comp

            Qn = diagQmu[n]
            Ndeb = nodes[0]
            comp = StorageLinear(label + str(n), (Ndeb, Ncomp),
                                 value=Qn,
                                 name='pL_',
                                 inv_coeff=False,
                                 ctrl='e')
            self += comp
Esempio n. 27
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'beta' not in kwargs:
            beta = 0.5
        else:
            beta = kwargs.pop('beta')

        diagR, diagQ = fractionalIntegratorWeights(p, beta, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        N, Nend = nodes
        for n in range(nbPoles):
            if n < nbPoles - 1:
                Ncomp = 'iN_' + label + str(n) + 'to' + str(n + 1)
            else:
                Ncomp = Nend
            nodes = (N, Ncomp)
            # here, diagRmu[n] is a conductance (effort-controlled)
            Rn = diagR[n]
            self += DissipativeLinear(label + 'R' + str(n),
                                      nodes,
                                      coeff=Rn,
                                      inv_coeff=True,
                                      ctrl='e')

            Qn = diagQ[n]
            self += StorageLinear(label + 'Q' + str(n),
                                  nodes,
                                  value=Qn,
                                  inv_coeff=False,
                                  ctrl='f')
            N = Ncomp
Esempio n. 28
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 def __init__(self, label, nodes, **kwargs):
     # init PortHamiltonianObject
     Graph.__init__(self, label=label)
     # pop connector type
     connector_type = kwargs.pop('connector_type')
     # build correspondance between labels in subs and pars (dicpars)...
     # ... and build the correspondance between symbols and subs (subs)
     dicpars, subs = mappars(self, **kwargs)
     # update dict of subs in phs
     self.core.subs.update(subs)
     # replace parameters in alpha by correspondances in 'dicpars'
     alpha = self.core.symbols('alpha')
     alpha = alpha.subs(dicpars)
     # symbols for inputs and outputs:
     u1, u2 = self.core.symbols([nicevarlabel('u', label + str(el))
                                 for el in (1, 2)])
     y1, y2 = self.core.symbols([nicevarlabel('y', label + str(el))
                                 for el in (1, 2)])
     # add connector component
     ny = self.core.dims.y()
     self.core.add_ports((u1, u2), (y1, y2))
     self.core.add_connector((ny, ny+1), alpha)
     # update phs.Graph with edges
     edge1_data = {'type': 'connector',
                   'connector_type': connector_type,
                   'alpha': alpha,
                   'ctrl': '?',
                   'label': y1,
                   'link': y2}
     edge2_data = {'type': 'connector',
                   'connector_type': connector_type,
                   'alpha': None,
                   'ctrl': '?',
                   'label': y2,
                   'link': y1}
     N1, N2, N3, N4 = nodes
     edges = [(N1, N2, edge1_data), (N3, N4, edge2_data)]
     # update phs.Graph with edges
     self.add_edges_from(edges)
Esempio n. 29
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'beta' not in kwargs:
            beta = 0.5
        else:
            beta = kwargs.pop('beta')

        diagR, diagQ = fractionalIntegratorWeights(p, beta, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        N, Nend = nodes
        for n in range(nbPoles):
            if n < nbPoles-1:
                Ncomp = 'iN_'+label + str(n) + 'to' + str(n+1)
            else:
                Ncomp = Nend
            nodes = (N, Ncomp)
            # here, diagRmu[n] is a conductance (effort-controlled)
            Rn = diagR[n]
            self += DissipativeLinear(label + 'R' + str(n),
                                         nodes,
                                         coeff=Rn,
                                         inv_coeff=True,
                                         ctrl='e')

            Qn = diagQ[n]
            self += StorageLinear(label + 'Q' + str(n),
                                     nodes,
                                     value=Qn,
                                     inv_coeff=False,
                                     ctrl='f')
            N = Ncomp
Esempio n. 30
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    def __init__(self, label, nodes, **kwargs):

        # instanciate a Graph object
        Graph.__init__(self, label=label)

        assert 'file' in kwargs, "pwl.dissipative component need 'file' argument"
        path = kwargs.pop('file')
        data = np.vstack(map(np.array, data_generator(path)))
        w_vals = data[0, :]
        z_vals = data[1, :]

        assert all(z_vals[np.nonzero(w_vals >= 0)] >= 0), 'All values z(w) for\
 w>=0 must be non-negative (component {})'.format(label)

        assert all(z_vals[np.nonzero(w_vals >= 0)] >= 0), 'All values z(w) for\
 w<0 must be negative (component {})'.format(label)

        assert all(z_vals[np.nonzero(w_vals == 0)] == 0), 'z(0) must be zero \
(component {})'.format(label)

        ctrl = kwargs.pop('ctrl')

        # state  variable
        w = symbols("w" + label)
        # storage funcion
        z = pwl_func(w_vals, z_vals, w, **kwargs)

        # edge data
        data = {'label': w, 'type': 'dissipative', 'ctrl': ctrl, 'link': None}
        N1, N2 = nodes

        # edge
        edge = (N1, N2, data)

        # init component
        self += edges.DissipativeNonLinear(label, [
            edge,
        ], w, z, **kwargs)
Esempio n. 31
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        dic = {'A': 1e2,  # [N.s/m] Felt damping coefficient
               'B': 2.5,  # [#] Hysteresis coefficient for the felt
               'F': 13.8,  # [N/m] Elastic characteristic force
               'L': 1.5*1e-2,  # [m] Height of the felt at rest
               }
        dic.update(kwargs)
        dicpars, subs = mappars(self, **dic)
        # parameters
        pars = ['L', 'F', 'A', 'B']
        L, F, A, B = symbols(pars)

        N1, N2 = nodes
        xnl = symbols('q'+label)
        hnl = sp.Piecewise((0., xnl <= 0.), ((L*F/(B+1))*(xnl/L)**(B+1), True))
        hnl = hnl.subs(dicpars)
        # edge data
        data = {'label': xnl,
                'type': 'storage',
                'ctrl': 'e',
                'link': None}
        self.add_edges_from([(N1, N2, data), ])
        self.core.add_storages(xnl, hnl)

        r = sp.Piecewise((0., xnl <= 0.), ((A * L/B)*(xnl/L)**(B-1), True))
        r = r.subs(dicpars)
        wnl = symbols('dtq'+label)
        # edge data
        data = {'label': wnl,
                'type': 'dissipative',
                'ctrl': 'e',
                'z': {'e_ctrl': r*wnl, 'f_ctrl': sp.sympify(0)},
                'link': None}
        self.add_edges_from([(N1, N2, data), ])
        self.core.add_dissipations(wnl, r*wnl)

        self.core.subs.update(subs)
Esempio n. 32
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)
        if 'p' not in kwargs:
            p = 1
        else:
            p = kwargs.pop('p')

        if 'alpha' not in kwargs:
            alpha = 0.5
        else:
            alpha = kwargs.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(p, alpha, **kwargs)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        for n in range(nbPoles):

            Rn = diagR[n]  # here, diagR[n] is a conductance (e-ctrl)

            N1 = 'N' + label + str(n) + "_1"
            N2 = 'N' + label + str(n) + "_2"
            self += DissipativeLinear(label + 'R' + str(n), (N1, Ndeb),
                                      inv_coeff=True,
                                      coeff=Rn,
                                      ctrl='e')

            Qn = diagQ[n]
            self += StorageLinear(label + 'Q' + str(n), (N2, datum),
                                  value=Qn,
                                  ctrl='f',
                                  inv_coeff=False)

            self += Transformer(label + 'alpha' + str(n),
                                (N1, Nend, N2, datum),
                                alpha=Rn**-1)
Esempio n. 33
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)

        parameters = parametersDefault(self.metadata['parameters'])
        parameters.update(kwargs)

        g = parameters.pop('g')
        alpha = parameters.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(g, alpha, **parameters)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        N1 = Ndeb
        for n in range(nbPoles):
            if n < nbPoles - 1:
                N2 = 'N' + label + str(n) + "_1"
            else:
                N2 = Nend
            Rn = diagR[n]  # here, diagR[n] is a res (flux-controlled)
            self += DissipativeLinear(label + 'R' + str(n), (N2, N1),
                                      ctrl='f',
                                      coeff=Rn,
                                      inv_coef=False)

            Qn = diagQ[n]
            N3 = 'N' + label + str(n) + "_2"
            self += StorageLinear(label + 'Q' + str(n), (N3, datum),
                                  value=Qn,
                                  inv_coeff=False,
                                  ctrl='e')

            Nend = nodes[1]
            self += Transformer(label + 'alpha' + str(n), (N1, N2, N3, datum),
                                alpha=Rn)
            N1 = N2
Esempio n. 34
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 def __init__(self, label, nodes, **kwargs):
     Graph.__init__(self, label=label)
     if not isinstance(kwargs['value'], Argument):
         coeff = Argument(label + 'coeff', kwargs['value'])
     else:
         coeff = kwargs['value']
     x = nicevarlabel("x", label)
     x = self.core.symbols(x)
     if kwargs['inv_coeff']:
         coeff.symb = coeff.symb**-1
     H = coeff.symb * x**2/2.
     self.core.add_storages([x], H)
     edge_data_dic = {'label': x,
                      'type': 'storage',
                      'ctrl': kwargs['ctrl'],
                      'link': None}
     edge = (nodes[0], nodes[1], edge_data_dic)
     self.add_edges_from([edge])
     self.core.subs.update(coeff.sub)
     if len(coeff.sub) == 0 and kwargs['inv_coeff']:
         self.core.p  += [coeff.symb**-1, ]
     elif len(coeff.sub) == 0:
         self.core.p  += [coeff.symb, ]
Esempio n. 35
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 def __init__(self, label, nodes, **kwargs):
     Graph.__init__(self, label=label)
     if not isinstance(kwargs['coeff'], Argument):
         coeff = Argument(label + 'coeff', kwargs['coeff'])
     else:
         coeff = kwargs['coeff']
     w_label = nicevarlabel("w", label)
     w = self.core.symbols(w_label)
     z_f_ctrl = coeff.symb*w
     z_e_ctrl = w/coeff.symb
     if 'inv_coeff' in kwargs and kwargs['inv_coeff']:
         z_f_ctrl, z_e_ctrl = z_e_ctrl, z_f_ctrl
     self.core.add_dissipations([w], [z_f_ctrl])
     edge_data_dic = {'label': w,
                      'type': 'dissipative',
                      'ctrl': '?',
                      'z': {'e_ctrl': z_e_ctrl, 'f_ctrl': z_f_ctrl},
                      'link': None}
     edge = (nodes[0], nodes[1], edge_data_dic)
     self.add_edges_from([edge])
     self.core.subs.update(coeff.sub)
     if len(coeff.sub) == 0:
         self.core.p  += [coeff.symb, ]
Esempio n. 36
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    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)

        parameters = parametersDefault(self.metadata['parameters'])
        parameters.update(kwargs)

        g = parameters.pop('g')
        beta = parameters.pop('beta')

        diagR, diagQ = fractionalIntegratorWeights(g, beta, **parameters)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        N, Nend = nodes
        for n in range(nbPoles):
            if n < nbPoles - 1:
                Ncomp = 'iN_' + label + str(n) + 'to' + str(n + 1)
            else:
                Ncomp = Nend
            nodes = (N, Ncomp)
            # here, diagRmu[n] is a conductance (effort-controlled)
            Rn = diagR[n]
            self += DissipativeLinear(label + 'R' + str(n),
                                      nodes,
                                      coeff=Rn,
                                      inv_coeff=True,
                                      ctrl='e')

            Qn = diagQ[n]
            self += StorageLinear(label + 'Q' + str(n),
                                  nodes,
                                  value=Qn,
                                  inv_coeff=False,
                                  ctrl='f')
            N = Ncomp
Esempio n. 37
0
    def __init__(self, label, nodes, **kwargs):
        Graph.__init__(self, label=label)

        parameters = parametersDefault(self.metadata['parameters'])
        parameters.update(kwargs)

        g = parameters.pop('g')
        beta = parameters.pop('beta')

        self.core.subs.update({
            self.core.symbols('g_' + label): g,
            self.core.symbols('beta_' + label): beta
        })

        diagRmu, diagQmu = fractionalIntegratorWeights(g, beta, **parameters)

        # Truncation of poles with null Q
        nbPoles = diagRmu.__len__()

        for n in range(nbPoles):
            Rn = diagRmu[n]  # here, diagRmu[n] is a resistance (f-ctrl)
            Nend = nodes[1]
            Ncomp = 'iN_' + label + str(n)
            comp = DissipativeLinear('R_' + label + str(n), (Ncomp, Nend),
                                     coeff=Rn,
                                     ctrl='f')
            self += comp

            Qn = diagQmu[n]
            Ndeb = nodes[0]
            comp = StorageLinear(label + str(n), (Ndeb, Ncomp),
                                 value=Qn,
                                 name='pL_',
                                 inv_coeff=False,
                                 ctrl='e')
            self += comp
Esempio n. 38
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    def __init__(self, label, nodes, **kwargs):

        parameters = parametersDefault(self.metadata['parameters'])
        parameters.update(kwargs)

        Graph.__init__(self, label=label)

        g = parameters.pop('g')
        alpha = parameters.pop('alpha')

        diagR, diagQ = fractionalDifferenciatorWeights(g, alpha, **parameters)

        # Truncation of poles with null Q
        nbPoles = diagR.__len__()

        Ndeb, Nend = nodes
        for n in range(nbPoles):

            Rn = diagR[n]  # here, diagR[n] is a conductance (e-ctrl)

            N1 = 'N' + label + str(n) + "_1"
            N2 = 'N' + label + str(n) + "_2"
            self += DissipativeLinear(label + 'R' + str(n), (N1, Ndeb),
                                      inv_coeff=True,
                                      coeff=Rn,
                                      ctrl='e')

            Qn = diagQ[n]
            self += StorageLinear(label + 'Q' + str(n), (N2, datum),
                                  value=Qn,
                                  ctrl='f',
                                  inv_coeff=False)

            self += Transformer(label + 'alpha' + str(n),
                                (N1, Nend, N2, datum),
                                alpha=Rn**-1)
Esempio n. 39
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"""

from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph

label = 'triodeamp'

path = os.path.realpath(__file__)[:os.path.realpath(__file__).rfind(os.sep)]

netlist_filename = path + os.sep + label + '.net'

netlist = Netlist(netlist_filename)

graph = Graph(netlist=netlist)

core = graph.to_core(verbose=False)
core.linear_nonlinear()
core.subsinverse()

#core.reduce_z()

#if __name__ == '__main__':
#
#    from pyphs import signalgenerator
#
#    config = {'fs': 96e3,
#              'split': True,
#              'pbar': True,
#              'maxit': 100,
Esempio n. 40
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"""
Created on Sat Jan 14 11:50:23 2017

@author: Falaize
"""

from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph

label = 'mka_dual'
path = os.path.realpath(__file__)[:os.path.realpath(__file__).rfind(os.sep)]
netlist_filename = path + os.sep + label + '.net'
netlist = Netlist(netlist_filename)
graph = Graph(netlist=netlist)
core = graph.buildCore()

#if __name__ == '__main__':
#
#    from pyphs import Simulation, signalgenerator
#    import numpy as np
#
#
#    tsig = 0.01
#    fs = 48000.
#
#    config = {'fs': 48e3,
#              'progressbar': True,
#              }
#    simu = Simulation(core, config)
Esempio n. 41
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from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph

# ---------------------------  NETLIST  ------------------------------------- #
label = 'piano_hammer'
this_script = os.path.realpath(__file__)
here = this_script[:this_script.rfind(os.sep)]
netlist_filename = here + os.sep + label + '.net'
netlist = Netlist(netlist_filename)


# ---------------------------  GRAPH  --------------------------------------- #
graph = Graph(netlist=netlist)


# ---------------------------  CORE  ---------------------------------------- #
core = graph.to_core()


## ---------------------------  SIMULATION  ---------------------------------- #
#if __name__ == '__main__':
#
#    import numpy
#    import matplotlib.pyplot as plt
#    from pyphs import Simulation
#
#    core.reduce_z()
#
Esempio n. 42
0
"""

from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph

# ---------------------------  NETLIST  ------------------------------------- #
label = 'pickup'
this_script = os.path.realpath(__file__)
here = this_script[:this_script.rfind(os.sep)]
netlist_filename = here + os.sep + label + '.net'
netlist = Netlist(netlist_filename)

# ---------------------------  GRAPH  --------------------------------------- #
graph = Graph(netlist=netlist, label=label)

# ---------------------------  CORE  ---------------------------------------- #
core = graph.buildCore()

## ---------------------------  SIMULATION  ---------------------------------- #
#if __name__ == '__main__':
#
#    import numpy
#    import matplotlib.pyplot as plt
#    from pyphs import Netlist, Graph
#    from pyphs.misc.tools import interleave
#
#    core.reduce_z()
#
#    # Define the simulation parameters
Esempio n. 43
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"""

from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph

# ---------------------------  NETLIST  ------------------------------------- #
label = 'piano_hammer'
this_script = os.path.realpath(__file__)
here = this_script[:this_script.rfind(os.sep)]
netlist_filename = here + os.sep + label + '.net'
netlist = Netlist(netlist_filename)

# ---------------------------  GRAPH  --------------------------------------- #
graph = Graph(netlist=netlist)

# ---------------------------  CORE  ---------------------------------------- #
core = graph.to_core()

## ---------------------------  SIMULATION  ---------------------------------- #
#if __name__ == '__main__':
#
#    import numpy
#    import matplotlib.pyplot as plt
#    from pyphs import Simulation
#
#    core.reduce_z()
#
#    # Define the simulation parameters
#    config = {'fs': 48e3,           # Sample rate (Hz)
Esempio n. 44
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from __future__ import absolute_import, division, print_function

import os
from pyphs import Netlist, Graph


label = 'triodeamp'

path = os.path.realpath(__file__)[:os.path.realpath(__file__).rfind(os.sep)]

netlist_filename = path + os.sep + label + '.net'

netlist = Netlist(netlist_filename)

graph = Graph(netlist=netlist)

core = graph.to_core(verbose=False)
core.linear_nonlinear()
core.subsinverse()

#core.reduce_z()

#if __name__ == '__main__':
#
#    from pyphs import signalgenerator
#
#    config = {'fs': 96e3,
#              'split': True,
#              'pbar': True,
#              'maxit': 100,
Esempio n. 45
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def plot_Graph():
    netlist = NetlistThieleSmallNL()
    graph = Graph(netlist=netlist)
    graph.plot(show=False)
    os.remove(path)
    return True
Esempio n. 46
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    def __init__(self, label, nodes, **kwargs):

        pars = parameters_JSV2016()

        for k in kwargs.keys():
            if k not in pars.keys() and str(k)[0] not in 'zw':
                raise AttributeError('parameter {} unknown'.format(k))

        Graph.__init__(self, label=label)

        pars.update(kwargs)
        pars.update({
                     # [kg] Modal mass density
                    'Mb': pi*(pars['R']**2)*pars['M'],
                    # [N/m] Modal stiffness
                    'Kb': (pars['E']*pi*pars['R']**4.)/4.,
                    })
        pars.update({
                    # [m] Tine length for the fondamental frequency f0[Hz]
                    'Lb': beamLength(pars['F'], pars['Kb'], pars['Mb'])
                    })

        # [1/m] list of the nkmax first cantilever beam  modes with length L
        k, fk = waveNumbers(pars['N'], pars['Lb'], pars['Kb'], pars['Mb'])

        # truncate below the Nyquist frequency fe/2
        # list of the nk first modes below the Nyquist frequency fe/2 [1/m]
        # k = k[(fk < pars['n']/2).nonzero()]
        # list of the nk first frequencies below the Nyquist frequency fe/2 [Hz]
        # fk = fk[(fk < pars['fs']/2).nonzero()]

        # [#] number of simulated modes
        pars.update({'kmodes': k,
                     'fmodes': fk})
        pars['N'] = len(pars['kmodes'])

        # [N/m**1] Modal damping coefficient
        pars.update({'Ab_array': pars['A']*10**(linspace(0, pars['D'],
                                                         pars['N']))})
        # definition of stiffnesses values
        coeffs = pars['Kb']*(k.flatten()**4)
        # definition of stiffnesses components
        for i, c in enumerate(coeffs):
            stiffness = Stiffness(label+'K'+str(i),
                                  (datum, label+'M'+str(i)),
                                  K=(label+'K'+str(i), c))
            self += stiffness
        # definition of masses values
        coeffs = [pars['Mb']]*pars['N']
        # definition of masses components
        for i, c in enumerate(coeffs):
            mass = Mass(label+'M'+str(i),
                        (label+'M'+str(i), ),
                        M=(label+'M'+str(i), c))
            self += mass

        # definition of dampers components
        coeffs = list(pars['Ab_array'])
        # definition of dampers components
        for i, c in enumerate(coeffs):
            damper = Damper(label+'A'+str(i),
                            (datum, label+'M'+str(i)),
                            A=(label+'A'+str(i), c))
            self += damper

        for n, Nn in enumerate(nodes):

            label_n = label+'T'+str(n)
            Omega = omega_cosine(pars['z'+str(n+1)]*pars['Lb'],
                                 pars['w'+str(n+1)],
                                 pars['Lb'], pars['kmodes'])

            # transformers associated with the coefficients of modal projection

            # Begining of the serial connection of transformers primals
            A1 = Nn
            # tail node for the serial connection of transformers primals
            if pars['N'] == 1:
                A2 = datum
            else:
                A2 = label_n + str(0)

            # iterate over coefficients values
            for i, o in enumerate(Omega):

                # define transfomer
                transfo = Transformer(label_n+str(i),
                                      (A1, A2,
                                      datum, label+'M'+str(i)),
                                      alpha=(label_n+'alpha'+str(i), o))
                self += transfo

                # update nodes
                A1 = label_n+str(i)
                if i == pars['N']-2:
                    A2 = datum
                else:
                    A2 = label_n+str(i+1)