ross.Rotor.run_misalignment

ross.Rotor.run_misalignment#

Rotor.run_misalignment(node, unbalance_magnitude, unbalance_phase, speed, t, coupling='flex', **kwargs)#

Run analysis for the rotor system with misalignment given an unbalance force.

Misalignment object is instantiated and system’s time response is simulated. There are two types of coupling: flexible (flex) and rigid, each with distinct parameters. These parameters are passed to the respective method through **kwargs.

Parameters:

nodelist, int

Node where the unbalance is applied.

unbalance_magnitudelist, float, pint.Quantity

Unbalance magnitude (kg.m).

unbalance_phaselist, float, pint.Quantity

Unbalance phase (rad).

speedfloat or array_like, pint.Quantity

Rotor speed.

Farray

Force array (needs to have the same number of rows as time array). Each column corresponds to a dof and each row to a time.

tarray

Time array.

couplingstr

Coupling type. The avaible types are: “flex” and “rigid”. Default is “flex”.

**kwargsdictionary

If coupling = “flex”, **kwargs receives:

nfloat: Number of shaft element where the misalignment is ocurring.
mis_type: string: Name of the chosen misalignment type. The avaible types are: “parallel”, “angular” and “combined”.
mis_distance_xfloat, pint.Quantity: Parallel misalignment distance between driving rotor and driven rotor along X direction.
mis_distance_yfloat, pint.Quantity: Parallel misalignment distance between driving rotor and driven rotor along Y direction.
mis_anglefloat, pint.Quantity: Angular misalignment angle.
radial_stiffnessfloat, pint.Quantity: Radial stiffness of flexible coupling.
bending_stiffnessfloat, pint.Quantity: Bending stiffness of flexible coupling. Provide if mis_type is “angular” or “combined”.
input_torquefloat, pint.Quantity: Driving torque. Default is 0.
load_torquefloat, pint.Quantity: Driven torque. Default is 0.

If coupling = “rigid”, **kwargs receives:

nfloat: Number of shaft element where the misalignment is ocurring.
mis_distancefloat, pint.Quantity: Parallel misalignment distance between driving rotor and driven rotor.
input_torquefloat, pint.Quantity: Driving torque. Default is 0.
load_torquefloat, pint.Quantity: Driven torque. Default is 0.

Additional keyword arguments can be passed to define the parameters of the Newmark method if it is used (e.g. gamma, beta, tol, …). See ross.utils.newmark for more details. Other keyword arguments can also be passed to be used in numerical integration (e.g. num_modes). See Rotor.integrate_system for more details.

Returns:

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

Examples

>>> import ross as rs
>>> from ross.probe import Probe
>>> from ross.units import Q_
>>> rotor = rotor_example_with_damping()
>>> n1 = rotor.disk_elements[0].n
>>> n2 = rotor.disk_elements[1].n
>>> results = rotor.run_misalignment(
...    node=[n1, n2],
...    unbalance_magnitude=[5e-4, 0],
...    unbalance_phase=[-np.pi / 2, 0],
...    speed=Q_(1200, "RPM"),
...    t=np.arange(0, 0.5, 0.0001),
...    coupling="rigid",
...    n=0,
...    mis_distance=2e-4,
...    input_torque=0,
...    load_torque=0,
...    num_modes=12,  # Pseudo-modal method
... )
Running pseudo-modal method, number of modes = 12
>>> probe1 = Probe(14, 0)
>>> probe2 = Probe(22, 0)
>>> fig1 = results.plot_1d([probe1, probe2])
>>> fig2 = results.plot_dfft(
...     [probe1, probe2],
...     frequency_range=Q_((0, 200), "Hz"),
...     yaxis_type="log",
... )

ross.Rotor.run_misalignment

Contents

ross.Rotor.run_misalignment#