地震模拟试验波形分频复现方法研究
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摘要
对于地震模拟试验中加速度波形复现方法在低频段精度差的问题,提出了按频率分段进行地震模拟波形复现的控制方法,分别对系统的加速度阻抗、位移阻抗进行辨识,并在处理过程中不断迭代更新。低于转折频率为位移控制区,高于转折频率为加速度控制区,并实现了位移驱动信号与加速度驱动信号的合成。该算法提高了地震模拟试验在低频段的精度,实现了地震模拟试验在整个试验频段内的高精度。最终在研发的地震模拟试验台上,分别对El-Centro地震波与Northridge地震波进行了复现,验证了算法的可行性。
For the problem of poor precision of waveform replication method on earthquake simulation test in low frequency section,the control method of waveform replication algorithm according to the frequency section was put forward. The acceleration impedances and displacement impedances of the system were identified and iterated continuously during the processing. Lower than the turning frequency is displacement zone and higher than the turning frequency was acceleration zone. The algorithm also realizes the synthesis of displacement driving signal and acceleration driving signal. The algorithm improves the precision of earthquake simulation test in low frequency section,and finally realizes the high precision of the earthquake simulation test in the whole test frequency band. The feasibility of the control method is verified by an experiment on the earthquake simulation platform.
For the problem of poor precision of waveform replication method on earthquake simulation test in low frequency section,the control method of waveform replication algorithm according to the frequency section was put forward. The acceleration impedances and displacement impedances of the system were identified and iterated continuously during the processing. Lower than the turning frequency is displacement zone and higher than the turning frequency was acceleration zone. The algorithm also realizes the synthesis of displacement driving signal and acceleration driving signal. The algorithm improves the precision of earthquake simulation test in low frequency section,and finally realizes the high precision of the earthquake simulation test in the whole test frequency band. The feasibility of the control method is verified by an experiment on the earthquake simulation platform.
引文
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[2]于慧君,陈章位.道路模拟试验自适应时域复现控制方法研究[J].振动工程学报,2007,20(5):498-501.
[3]肖长志.地震模拟试验系统控制技术研究[D].哈尔滨:哈尔滨工业大学,2011.
[4]林泽宇.液压振动实验台的时域波形复现控制的软件实现[D].哈尔滨:哈尔滨工业大学,2013.
[5]田磐,陈章位.基于弹性负载的地震模拟试验控制策略[J].振动与冲击,2013,32(5):26-30.
[6]赵越阳,冯咬齐,邱汉平,等.多自由度微振动环境时域波形复现的数值仿真[J].航天器环境工程,2017,34(3):241-246.
[7]沈刚.三自由度电液振动台时域波形复现控制策略研究[D].哈尔滨:哈尔滨工业大学,2011.
[8]李宾.汽车零部件道路模拟时域波形复现控制策略研究[D].哈尔滨:哈尔滨工业大学,2015.