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基于强震时断层附近地面地震动转动分量对单摆式地震仪水平和竖向摆造成的响应差异性,建立采用小波分析获取地震动转动分量的方法。首先采用离散小波变换探讨未修正地震动水平和竖向分量的局部时频特性;进而在水平和竖向分量低频差异性的基础上,建立新的阈值处理方法对水平分量的小波系数进行处理,从而获取了地震动转动分量;最后,通过振动台试验验证了基于小波分析的地震动转动分量获取方法的正确性和精度。结果表明:基于小波分析获取的地震动转动分量的残余倾斜位移与实测的基本吻合,且过滤掉转动分量的水平分量傅里叶谱的低频部分与竖向分量的较为相似;振动台试验验证了基于小波分析获取地震动摇摆分量方法的正确性,且相较于基于傅里叶分析的方法,结果与实际情况更加吻合,精度实现了大幅提高。
Based on the difference of the response of ground-shaking motion to the horizontal and vertical swinging of pendulum seismograph in the event of strong earthquakes, a method of obtaining the rotational component of earthquakes using wavelet analysis is established. Firstly, the local time-frequency characteristics of uncorrected ground motion and vertical components are explored by using discrete wavelet transform (DWT). Based on the low frequency difference between horizontal and vertical components, a new threshold processing method is proposed to process the wavelet coefficients of horizontal components, Finally, the correctness and accuracy of the method of obtaining the rotational component of ground motion based on wavelet analysis are verified by shaking table test. The results show that the residual tilt displacement of the ground motion component obtained by wavelet analysis agrees well with the measured data, and the low-frequency component and the vertical component of the Fourier component of the horizontal component of the filtered rotation component are similar. The shaking table test verifies Compared with the method based on Fourier analysis, the result obtained by wavelet analysis is more accurate than the actual situation, and the accuracy is greatly improved.