... 不定常方法：time-dependent method 不定常迭代：non-stationary iteration 不定常：Unsteady ...
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Then a new iteration method is developed for generation of random accelerograms non-stationary both in amplitude and frequency which are compatible with target.
提出一种以渐进谱为目标谱的生成幅值和频率非平稳地震加速度时程的迭代方法。
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