ross.CriticalSpeedResults

class ross.CriticalSpeedResults(_wn, _wd, log_dec, damping_ratio, whirl_direction)

Class used to store results from run_critical_speed() method.

Parameters:

_wnarray

Undamped critical speeds array.

_wdarray

Undamped critical speeds array.

log_decarray

Logarithmic decrement for each critical speed.

damping_ratioarray

Damping ratio for each critical speed.

whirl_directionarray

Whirl direction for each critical speed. Can be forward, backward or mixed.

Methods

__init__(_wn, _wd, log_dec, damping_ratio, whirl_direction)

classmethod load(file)

Load results from a .toml file.

This function will load the simulation results from a .toml file. The file must have all the argument’s names and values that are needed to reinstantiate the class.

Parameters:

filestr, pathlib.Path

The name of the file the results will be loaded from.

Examples

>>> # Example running a stochastic unbalance response
>>> from tempfile import tempdir
>>> from pathlib import Path
>>> import ross as rs
>>> # Running an example
>>> rotor = rs.rotor_example()
>>> freq_range = np.linspace(0, 500, 31)
>>> n = 3
>>> m = 0.01
>>> p = 0.0
>>> results = rotor.run_unbalance_response(n, m, p, freq_range)
>>> # create path for a temporary file
>>> file = Path(tempdir) / 'unb_resp.toml'
>>> results.save(file)
>>> # Loading file
>>> results2 = rs.ForcedResponseResults.load(file)
>>> abs(results2.forced_resp).all() == abs(results.forced_resp).all()
True

classmethod read_toml_data(data)

Read and parse data stored in a .toml file.

The data passed to this method needs to be according to the format saved in the .toml file by the .save() method.

Parameters:

datadict

Dictionary obtained from toml.load().

Returns:

The result object.

save(file)

Save results in a .toml file.

This function will save the simulation results to a .toml file. The file will have all the argument’s names and values that are needed to reinstantiate the class.

Parameters:

filestr, pathlib.Path

The name of the file the results will be saved in.

Examples

>>> # Example running a unbalance response
>>> from tempfile import tempdir
>>> from pathlib import Path
>>> import ross as rs

>>> # Running an example
>>> rotor = rs.rotor_example()
>>> speed = np.linspace(0, 1000, 101)
>>> response = rotor.run_unbalance_response(node=3,
...                                         unbalance_magnitude=0.001,
...                                         unbalance_phase=0.0,
...                                         frequency=speed)

>>> # create path for a temporary file
>>> file = Path(tempdir) / 'unb_resp.toml'
>>> response.save(file)

wd(frequency_units='rad/s')

Convert units for damped critical speeds.

Parameters:

frequency_unitsstr, optional

Critical speeds units. Default is rad/s

Returns:

wdarray

Undamped critical speeds array.

wn(frequency_units='rad/s')

Convert units for undamped critical speeds.

Parameters:

frequency_unitsstr, optional

Critical speeds units. Default is rad/s

Returns:

wnarray

Undamped critical speeds array.