一种改进的基于自适应控制的地震模拟试验方法
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摘要
针对地震模拟试验常采用的开环迭代控制存在控制精度差的缺点,提出一种用于地震模拟的自适应控制方法。用该方法不断识别系统的传递函数克服液压系统的时变性,获得较高的地震模拟波形复现精度。在此基础上,通过分析控制方法中预试验步骤存在的不足,实现试验方法改进,使得无需预试验步骤便能直接进行正式试验,且首帧试验中的参考时域信号和控制时域信号相关系数较高。试验表明:改进后的试验方法在不进行预试验的情况下,首帧地震模拟试验获得75%以上的输入输出信号时域相关系数,同时能缩短试验时间;多帧地震模拟试验后,通过更新系统传递函数,地震模拟输入输出信号时域相关系数能稳定在95%以上。
To overcome the poor control precision of iterative learning control(ILC) which is generally used in earthquake simulation test,an adaptive control method was proposed.Adaptive control can obtain high simulation precision for seismic wave,by continuously identifying the transfer function of shaking table to overcome the time-variation of hydraulic system.On the basis of analyzing the disadvantage of pre-test step,the test method was so improved that the earthquake simulation test can be completed without conventional pre-test step,and the correlation coefficient betwecn reference signal and control signal in time domain can reach a high level.Several typical earthquake wave experimental results,got on Zhejiang University shaking table,indicate that by the improved test method,the first frame correlation coefficient between reference signal and control signal in time domain can reach above 75% without pre-test step,while the experimental time is shortened;and after several frames of earthquake simulation test,the correlation coefficient can reach 95% through identifying the transfer function continuously.
To overcome the poor control precision of iterative learning control(ILC) which is generally used in earthquake simulation test,an adaptive control method was proposed.Adaptive control can obtain high simulation precision for seismic wave,by continuously identifying the transfer function of shaking table to overcome the time-variation of hydraulic system.On the basis of analyzing the disadvantage of pre-test step,the test method was so improved that the earthquake simulation test can be completed without conventional pre-test step,and the correlation coefficient betwecn reference signal and control signal in time domain can reach a high level.Several typical earthquake wave experimental results,got on Zhejiang University shaking table,indicate that by the improved test method,the first frame correlation coefficient between reference signal and control signal in time domain can reach above 75% without pre-test step,while the experimental time is shortened;and after several frames of earthquake simulation test,the correlation coefficient can reach 95% through identifying the transfer function continuously.
引文
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[2]贾丽花.电液伺服地震模拟振动台控制算法的研究与实现[D].北京:北京交通大学,2006,52-58.
[3]Kuehn J,Epp D,PattenW N.High-fidelity control of aseismic shake table[J].Earthquake Engineering&Structural Dynamics,1999,28(11):1235-1254.
[4]于慧君.电液振动试验系统长时间历程复现控制技术研究[D].杭州:浙江大学,2009,81-84.
[5]唐贞云,李振宝,纪金豹,等.地震模拟振动台控制系统的发展[J].地震工程与工程振动,2009.29(6):162-169.
[6]韩俊伟,于丽明,赵慧,等.地震模拟振动台三状态控制的研究[J].哈尔滨工业大学学报,1999,31(3):21-28.
[7]王春行.液压控制系统[M].北京:机械工业出版社,2006:112-129.
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