【摘要】 研究了平稳随机地震动过程的功率谱拟合问题,分析比较了４类常用拟合模型,发现其中３类模型存在谱收敛性方面的问题,对此进行了全面的阐述,并提出了一类新的满足谱收敛性的拟合三角级数模型,该模型利用分段功率谱密度函数生成各频段的随机频率,反映了功率谱对不同频段内频率随机性的影响,并且便于控制拟合三角级数中的频率成份。由于人造地震动在工程抗震研究上的重要性,本文研究成果对于正确生成地震加速度时程具有实际意义。更多还原

【Abstract】 The PSD simulation of stationary random ground motion process is studied in this paper. By analysing and comparing 4 common simulation models, the spectrum convergence problem which exists in three models of them is pointed out and explained comprehensively. A new simulation model satisfying the spectrum convergence is derived. The fact that random frequency in each band can be generated by using local PSD function shows the influence of PSD on random property of frequency in each band and provides an approach to control the frequency components in the model. Since the artificial ground motion to research of earthquake engineering is impartant effect, the result of this paper is practical to generating random seismic ground motion.更多还原