def test_acceleration_mss_velocity_ms_to_ds(self):
"""Tests the conversion from acceleration m/s^s and velocity m/s
to rotational speed d/s."""
# Examples taken from
# www.mattawanschools.org/14662062013835470/lib/14662062013935470/
# Ch_8_Problem_set.pdf
velocity_ms = 2 * math.pi * 4.0 / 2.0
acceleration_mss = velocity_ms ** 2 / 4.0
self.assertAlmostEqual(
4.0 * 0.5 * 360.0, # 2 seconds per revolution
Telemetry.acceleration_mss_velocity_ms_to_ds(
acceleration_mss,
velocity_ms
)
)
velocity_ms = 2 * math.pi * 5e4 / 1.8e3
acceleration_mss = velocity_ms ** 2 / 5e4
self.assertAlmostEqual(
30 * 60 * 360.0, # 1 revolution per 30 minutes
Telemetry.acceleration_mss_velocity_ms_to_ds(
acceleration_mss,
velocity_ms
)
)
def test_acceleration_mss_velocity_ms_to_ds(self):
"""Tests the conversion from acceleration m/s^s and velocity m/s
to rotational speed d/s."""
# Examples taken from
# www.mattawanschools.org/14662062013835470/lib/14662062013935470/
# Ch_8_Problem_set.pdf
velocity_ms = 2 * math.pi * 4.0 / 2.0
acceleration_mss = velocity_ms**2 / 4.0
self.assertAlmostEqual(
4.0 * 0.5 * 360.0, # 2 seconds per revolution
Telemetry.acceleration_mss_velocity_ms_to_ds(
acceleration_mss, velocity_ms))
velocity_ms = 2 * math.pi * 5e4 / 1.8e3
acceleration_mss = velocity_ms**2 / 5e4
self.assertAlmostEqual(
30 * 60 * 360.0, # 1 revolution per 30 minutes
Telemetry.acceleration_mss_velocity_ms_to_ds(
acceleration_mss, velocity_ms))
