The invention belongs to the technical field of anti-
seismic safety analysis and evaluation of
nuclear power equipment
engineering, and relates to a multi-damping
artificial wave fitting method for constructing a multi-parameterized
time domain adjustment curve. According to the narrow-band
time history construction method, the narrow-band
time history has narrow-band characteristics in a
time domain and a
frequency domain, the
ringing effect caused by
Fourier transform is avoided, and the new narrow-band
time history is called as a standard input time history; the
artificial wave is roughly adjusted in a mode of separately superposing each
damping ratio of each frequency
control point with the standard input time history; then, a frequency
control point with the maximum absolute deviationis searched; the
optimal weight combination of the standard input time history of each
damping ratio at the frequency is searched by using a
simulated annealing algorithm so as to simultaneously superpose the standard input time history of multiple damping ratios, thereby controlling the influence of the superposed time history on the
response spectrum in the
time domain adjustment process and further improving the fitting precision of all
damping ratio response spectrums at the frequency; a frequency
control point with the maximum relative deviation is searched, and circularly adjusting is performed in the same way; and finally, the
artificial wave is adjusted in the post-
processing module, so that the artificial wave meets the standard requirement, and the fitting precision is further improved. According to the method, the multi-damping artificial wave fitting problem formed by the frequency and the damping ratio is subjected to
dimensionality reduction processing, the problem is simplified into the one-dimensional problem only needing to pay attention to the frequency, and the artificial
seismic wave of the high-precision fitting multi-damping
nuclear power design spectrum canbe generated.