sdynpy.fileio.sdynpy_rattlesnake.read_system_id_data

• Module: sdynpy.fileio.sdynpy_rattlesnake

• Source: GitHub

Signature¶

def sdynpy.fileio.sdynpy_rattlesnake.read_system_id_data(file)

Read system-identification data from a Rattlesnake npz file.

Parses the FRF matrix, response CPSD, reference CPSD, response noise CPSD, reference noise CPSD, and multiple coherence from a numpy .npz file produced by the Rattlesnake system-identification routine. Applies response and reference transformation matrices when they are present in the file (i.e. when the corresponding array is not NaN).

Parameters¶

• file : str or numpy.lib.npyio.NpzFile Path to the Rattlesnake .npz system-ID file, or an already-loaded NpzFile object.

Returns¶

• frfs : TransferFunctionArray Frequency response function matrix from the system ID.

• response_cpsd : PowerSpectralDensityArray Response cross-power spectral density array.

• reference_cpsd : PowerSpectralDensityArray Reference cross-power spectral density array.

• response_noise_cpsd : PowerSpectralDensityArray Response noise cross-power spectral density array.

• reference_noise_cpsd : PowerSpectralDensityArray Reference noise cross-power spectral density array.

• coherence : MultipleCoherenceArray Multiple coherence array for each response channel.