ross.Rotor.run_forced_response

Rotor.run_forced_response(force=None, speed_range=None, modes=None, unbalance=None)

Forced response for a mdof system.

This method returns the unbalanced response for a mdof system given magnitude and phase of the unbalance, the node where it’s applied and a frequency range.

Available plotting methods:

.plot() .plot_magnitude() .plot_phase() .plot_polar_bode() .plot_deflected_shape() .plot_bending_moment() .plot_deflected_shape_3d() .plot_deflected_shape_2d()

Parameters:

forcelist, array, pint.Quantity

Unbalance force in each degree of freedom for each value in omega

speed_rangelist, array, pint.Quantity

Array with the desired range of frequencies

modeslist, optional

Modes that will be used to calculate the frequency response (all modes will be used if a list is not given).

unbalancearray, optional

Array with the unbalance data (node, magnitude and phase) to be plotted with deflected shape. This argument is set only if running an unbalance response analysis. Default is None.

Returns:

resultsross.ForcedResponseResults

For more information on attributes and methods available see: ross.ForcedResponseResults

Examples

>>> rotor = rotor_example()
>>> speed = np.linspace(0, 1000, 101)
>>> force = rotor._unbalance_force(3, 10.0, 0.0, speed)
>>> resp = rotor.run_forced_response(force=force, speed_range=speed)
>>> abs(resp.forced_resp)
array([[0.00000000e+00, 5.06073311e-04, 2.10044826e-03, ...