Abstract
Aiming at the problem of poor accuracy of acceleration waveform reproduction during the shaking table test of earthquake simulation, a hybrid integration algorithm based on seismic acceleration signal is proposed to control the trend term error. The low-frequency attenuation integral algorithm in the frequency domain is used to integrate the original seismic acceleration signal once to obtain the vibration velocity signal, then, the polynomial fitting integration algorithm is introduced to integrate of the vibration velocity signal once in the time domain to obtain the vibration displacement signal. Through these two integrals, the sensitivity of low frequency band during frequency domain integration and the accumulation of small errors in time domain are reduced. Finally, the hybrid integration algorithm is used to perform seismic wave reproduction experiments on the seismic simulation shaker and good results are obtained, which proves that the hybrid integration calculation has high practical value and practical significance in improving the accuracy of the vibration table waveform reproduction.
Highlights
Earthquake simulation shaking table is a research material or building structure under earthquake or specific vibration that can more realistically simulate the state of stress and failure form of the structure under the action of seismic load
The research shows that the hybrid integration algorithm can effectively improve the test error compared with other simple timedomain or frequency-domain integration, and the seismic wave simulation shake table test shows that the algorithm has certain advantages in processing seismic acceleration signals
In order to deal with the problem of poor accuracy of seismic waveform reproduction caused by large errors in the integration
Summary
Earthquake simulation shaking table is a research material or building structure under earthquake or specific vibration that can more realistically simulate the state of stress and failure form of the structure under the action of seismic load. In the real vibration occurrence site, the detection of the signal displacement response is very troublesome, and even for some reasons, it can not be directly measured, so most natural signals such as seismic waves are stored in the form of acceleration, at present, the displacement and velocity time-history curves of the test waveform need to be obtained in most seismic simulation shaking table tests, and the control signal required for each action of the servo motor is calculated through these two curves. The low-frequency attenuation integration algorithm in the frequency domain is used to integrate the original seismic acceleration signal once to obtain the vibration velocity signal, which is mainly used to control the low-frequency trend term error. The research shows that the hybrid integration algorithm can effectively improve the test error compared with other simple timedomain or frequency-domain integration, and the seismic wave simulation shake table test shows that the algorithm has certain advantages in processing seismic acceleration signals
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