摘要
根据非平稳输入下建立的功率谱与均值反应谱之间的关系,合成基于水工设计反应谱的人工地震波,并对其幅值进行修正,降低了高频区误差作用。为了解决加速度时程积分后的速度、位移时程的零线漂移现象,利用Huang变换得到加速度时程的固有模态函数,这种最低频率固有模态函数分量通常情况下代表原始信号的趋势或均值;再对去掉均值后的加速度时程进行积分,得到的速度、位移时程不存在零线漂移问题。
A method that can simulate earhtquake wave based on the hydraulic design response spectrum and the relationship of power spectrum and mean response spectrum in the non-stationary input is presented. It can be used to modify the initial wave and reduce the error of high frequency. In order to solve the shift of velocity and displacement obtained by integraling acceleration, the Huang transform is used to obtain the intrinsic mode functions of acceleration. The lowest frequency intrinsic mode function is generally the mean value or trend of singals. The velocity and displacement obtainde by Integraling the acceleration which is deducted trend dont have the shift problem.
出处
《西北地震学报》
CSCD
北大核心
2008年第3期255-260,共6页
Northwestern Seismological Journal
基金
国家自然科学基金重大研究计划重点项目(90510017)
中国博士后科学基金(20060390832)
关键词
人工地震波
功率谱
幅值谱
Huang变换
固有模态函数
Simulated earthquake wave
Power spectrum
Ampltiude spectrum
Huang transform
Intrinsic mode functions
