计算响应谱矩的复模态方法

CALCULATING RESPONSE SPECTRAL MOMENTS VIA COMPLEX MODAL ANALYSIS

Response spectral moments are useful information for system performance prediction. Usually, spectral moments are calculated by the frequency domain method. Among the existing references some related analytical results are restricted to the classical damping cases; some are restricted to the white noise excitation; and none deals with the band-limited white noise excitation. By using the time domain modal analysis, the authors suggest a new method for calculating the response spectral moments, which can apply to both classical and non-classical damping cases and to all three kinds of random excitations, i.e. white noise, filtered white noise, and band-limited white noise.