def __init__(self, name, masscenter=None, mass=None, frame=None, central_inertia=None): self.name = name self.loads = [] if frame is None: frame = ReferenceFrame(name + '_frame') if masscenter is None: masscenter = Point(name + '_masscenter') if central_inertia is None and mass is None: ixx = Symbol(name + '_ixx') iyy = Symbol(name + '_iyy') izz = Symbol(name + '_izz') izx = Symbol(name + '_izx') ixy = Symbol(name + '_ixy') iyz = Symbol(name + '_iyz') _inertia = (inertia(frame, ixx, iyy, izz, ixy, iyz, izx), masscenter) else: _inertia = (central_inertia, masscenter) if mass is None: _mass = Symbol(name + '_mass') else: _mass = mass masscenter.set_vel(frame, 0) # If user passes masscenter and mass then a particle is created # otherwise a rigidbody. As a result a body may or may not have inertia. if central_inertia is None and mass is not None: self.frame = frame self.masscenter = masscenter Particle.__init__(self, name, masscenter, _mass) else: RigidBody.__init__(self, name, masscenter, frame, _mass, _inertia)
def __init__(self, symbol, point, mass): Particle.__init__(symbol, point, mass)