基于ITD的强震动加速度记录数据处理方法

The Data Processing Method for the Strong Vibration Acceleration Record Based on ITD

基于本征时间尺度分解算法(ITD)对比了二次拟合法、EMD算法对人工合成地震波的处理结果,证明了ITD算法对于强震动加速度记录数据的基线校正有较好的校正效果;进一步基于ITD算法对台湾集集地震和某强震动台阵未校正加速度记录进行处理,并采用带通滤波方法进行进一步滤波处理和变换得到校正后的加速度、傅里叶频谱、反应谱;最后通过梯形数值积分计算得到速度和位移。对比分析了ITD算法、EMD算法采用上述计算流程和强震分析软件的计算结果,验证了文中提出的强震动数据处理方法是稳定、可靠的,可以作为实时、快速的处理强震动加速度记录的一种有效方法。

Based on the intrinsic time-scale decomposition(ITD)algorithm,the paper compares the processing results of the quadratic fitting method and the EMD algorithm for artificial synthetic seismic waves,and proves that the ITD algorithm has a good correction effect on the baseline correction of the strong motion acceleration record data.Furthermore,the ITD algorithm was used to process the uncorrected acceleration record of the Chi-Chi earthquake in Taiwan and a certain strong motion array,and then the band-pass filtering was adopted for further filtering and transformation to obtain the corrected acceleration,Fourier spectrum,and response spectrum.Finally,the velocity and displacement are calculated by trapezoidal numerical integration.By comparing and analyzing the calculation results of the ITD algorithm and the EMD algorithm by using the above calculation process and strong motion analysis software,it is proved that the method of strong vibration data processing proposed in this paper was stable and reliable,and can be used as an effective method to deal with the the strong vibration acceleration records in real time and quickly.