sdypy-FRF

Frequency response function as used in structural dynamics.

The sdypy-FRF is a namespace project of the sdypy framework and is a direct link to the pyFRF package (developed at pyFRF).

Use the sdypy package to conveniently access the functionality of the pyFRF package through its namespace (see example below).

Other functionalities of the sdypy framework include:

• sdypy-EMA: Experimental Modal Analysis
• sdypy-io: Input/Output operations (LVM files, UFF files)
• sdypy-excitation: Excitation signals as used in structural dynamics and vibration fatigue

For more information check out the showcase examples and see documentation.

Basic sdypy-FRF usage:

Import the module:

from sdypy import FRF

Make an instance of FRF class:

a = FRF.FRF(
    sampling_freq,
    exc=None,
    resp=None,
    exc_type='f', resp_type='a',
    window='none',
    weighting='linear',
    fft_len=None,
    nperseg=None,
    noverlap=None,
    archive_time_data=False,
    frf_type='H1',
    copy=True
)

Adding data:

We can add the excitation and response data at the beginning through exc and resp arguments, otherwise, the excitation and response data can be added later via add_data() method:

a.add_data(exc, resp)

Computing FRF:

The preferable way to get the frequency response functions is via get_FRF() method:

frf = a.get_FRF(type="default", form="receptance")

We can also directly get the requested FRF via other methods: get_H1(), get_H2(), get_Hv() and, get_ods_frf():

H1 = a.get_H1()
H2 = a.get_H2()
Hv = a.get_Hv()
ods_frf = a.get_ods_frf()

to test the Showcase.ipynb.