地震加速度时程在时域和频域积分中的对比分析  

作　　者：徐龙辉 

机构地区：[1]广州南粤地震工程勘察有限公司,广州510641

出　　处：《科技创新与应用》2022年第23期65-68,共4页Technology Innovation and Application

摘　　要：为对比地震加速度在时域和频域积分的优缺点,该文用2种方法分别对EL-Centro波和Northridge波进行时程分析。结果表明,在对初始加速度不进行任何处理时,时域积分因直流通量和干扰噪声的原因会存在较大的基线漂移现象,导致速度或位移信号“失真”;在进行了二次项趋势项校正后,虽能改善基线漂移现象,但是却有可能使得时域积分后的信号与初始加速度信号存在较大形变;频域积分相较于时域积分则具有更强的稳定性、准确性和适用性,进行高通滤波后更能改善基线漂移现象,同时使积分后的信号与初始加速度信号保持较好的一致性。In order to compare the advantages and disadvantages of seismic acceleration integration in time domain and frequency domain, this paper uses two methods to analyze the time history of EL-Centro wave and Northridge wave respectively. The results show that when the initial acceleration is not processed, the time domain integral will have a large baseline drift due to DC flux and interference noise, resulting in velocity or displacement signal "distortion". After the correction of the quadratic trend term, although the baseline drift can be improved, it is possible to make the signal after the time domain integral have greater deformation with the initial acceleration signal;compared with the time domain integral, the frequency domain integral has stronger stability, accuracy and applicability, and the high-pass filter can improve the baseline drift phenomenon and keep a good consistency between the integrated signal and the initial acceleration signal.

关 键 词：地震加速度 时域积分 频域积分 速度时程 位移时程 

分 类 号：P315[天文地球—地震学]