—A data windowing approach is developed to
estimate the evolutionary power spectra of strong motion
earthquakes. The main properties and the engineering
significance of the evolutionary power spectrum of seismic
accelerations are first presented. Specific guidelines for optimal
windowing to be used in time dependent spectrum analyses of
transient signals are then formulated. Based on these guidelines,
three moving data window functions and their characteristics
are examined with the perspective of studying their effects on
both the spectral resolution and the stability of spectral
estimates of earthquake strong ground motions. Specific
parameter values for which particular data window functions
are more suitable to be used in order to obtain reliable estimates
of the evolutionary spectral amplitudes are discussed.
—Data window functions, nonlinear response
spectrum, random process, strong ground motions.
The authors are with the Ecole Nationale Polytechnique, 10 Avenue
Hassen Badi, 16200 Algiers, Algeria (e-mail: email@example.com,
Cite:Hammoutène Malek and Tiliouine Boualem, "Time Dependent Spectrum Analysis of Transient Signals:
Application to Seismic Engineering," International Journal of Engineering and Technology vol. 5, no. 3, pp. 424-427, 2013.