sdypy-excitation
================
Frequency response function as used in structural dynamics.
-----------------------------------------------------------
The ``sdypy-excitation`` is a namespace project of the ``sdypy`` framework and is a direct link
to the ``pyExSi`` package (developed at `pyFRF <https://github.com/ladisk/pyExSi>`_).
Use the ``sdypy`` package to conveniently access the functionality of the
`pyFRF <https://github.com/ladisk/pyExSi>`_ package through its namespace (see example below).
Other functionalities of the ``sdypy`` framework include:
- `sdypy-EMA <https://github.com/sdypy/sdypy-EMA>`_: Experimental Modal Analysis
- `sdypy-io <https://github.com/sdypy/sdypy-io>`_: Input/Output operations (LVM files, UFF files)
- `sdypy-FRF <https://github.com/sdypy/sdypy-FRF>`_: Frequency Response Function estimation
For more information check out the showcase examples and see documentation_.
Basic ``sdypy-excitation`` usage:
---------------------------------
Import the module:
~~~~~~~~~~~~~~~~~~
.. code:: python
import numpy as np
# import the sdypy module
import sdypy as sd
N = 2**16 # number of data points of time signal
fs = 1024 # sampling frequency [Hz]
t = np.arange(0,N)/fs # time vector
# define frequency vector and one-sided flat-shaped PSD
M = N//2 + 1 # number of data points of frequency vector
freq = np.arange(0, M, 1) * fs / N # frequency vector
freq_lower = 50 # PSD lower frequency limit [Hz]
freq_upper = 100 # PSD upper frequency limit [Hz]
PSD = sd.excitation.get_psd(freq, freq_lower, freq_upper) # one-sided flat-shaped PSD
#get gaussian stationary signal
gausian_signal = sd.excitation.random_gaussian((N, PSD, fs))
#get non-gaussian non-stationary signal, with kurtosis k_u=10
#amplitude modulation, modulating signal defined by PSD
PSD_modulating = sd.excitation.get_psd(freq, freq_lower=1, freq_upper=10)
#define array of parameters delta_m and p
delta_m_list = np.arange(.1,2.1,.5)
p_list = np.arange(.1,2.1,.5)
#get signal
nongaussian_nonstationary_signal = sd.excitation.nonstationary_signal(N,PSD,fs,k_u=5,modulating_signal=('PSD', PSD_modulating),param1_list=p_list,param2_list=delta_m_list)
.. _documentation: https://sdypy-excitation.readthedocs.io/en/latest/
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