基于弹性负载的地震模拟试验控制策略
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摘要
传统地震模拟试验控制方法多将试件假定为刚性负载。针对该控制方法在实际应用中精度差的缺点,提出一种基于弹性负载的地震模拟控制策略,通过分析弹性试件力学模型,合理设置内环伺服控制参数,实现各种负载下系统传递特性的近似统一。在此基础上,优化外环振动控制辨识方法。振动台系统能在无预试验步骤情况下获得较高地震波形复现精度。试验表明:该控制策略无需预试验,在优化的伺服控制参数下,能在首帧地震模拟试验中获得85%以上的输入输出信号时域相关系数;经数帧试验,通过对系统驱动信号进行更新,地震模拟输入输出信号时域相关系数能稳定在90%以上。
The specimen is assumed to be rigid payload in traditional earthquake simulation test control.To overcome the poor control precision of this kind of control,an earthquake simulation control strategy was proposed.In the control strategy,servo-control parameters were set reasonably by analyzing physical modes of elastic payload,so the transfer function of the shaking table can keep approximately unvaried under a variety of different loads.On this basis,the system identification method of vibration control was optimized.The shaking table system can achieve high simulation precision for seismic wave without pre-test step.The experimental results on the Zhejiang University shaking table indicate that with the control strategy,the first frame correlation coefficient between reference signal and control signal in time domain can be above 85%without pre-test step in the case of parameter optimization;and after several frames of earthquake simulation test,the correlation coefficient can reach 90%through identifying the transfer function continuously.
The specimen is assumed to be rigid payload in traditional earthquake simulation test control.To overcome the poor control precision of this kind of control,an earthquake simulation control strategy was proposed.In the control strategy,servo-control parameters were set reasonably by analyzing physical modes of elastic payload,so the transfer function of the shaking table can keep approximately unvaried under a variety of different loads.On this basis,the system identification method of vibration control was optimized.The shaking table system can achieve high simulation precision for seismic wave without pre-test step.The experimental results on the Zhejiang University shaking table indicate that with the control strategy,the first frame correlation coefficient between reference signal and control signal in time domain can be above 85%without pre-test step in the case of parameter optimization;and after several frames of earthquake simulation test,the correlation coefficient can reach 90%through identifying the transfer function continuously.
引文
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[3]Kuehn J,Epp D,PattenW N.High-fidelity control of a seismic shake table[J].Earthquake Engineering & Structural Dynamics,1999,28(11 ):1235 - 1254.
[4]王春行.液压控制系统[M].北京:机械工业出版社, 2006:112-129.
[5]黄浩华.地震模拟振动台的设计与应用技术[M].北京:地震出版社,2008:59-76.
[6]李振宝,唐贞云,周大兴,等.试件特性对地震模拟振动台控制性能影响Ⅰ-对系统稳定性的影响[J].北京工业大学学报,2010,36(8):1091-1098. LI Zhen-bao,TANG Zhen-yun,ZHOU Da-xing,et al. Effects on the earthquake simulation caused by the characteristics of the specimen in the shaking table tests-part 1:effects on the stability of the system[J].Journal of Beijing University of Technology,2010,36(8):1091 -1098.
[7]唐贞云,李振宝,周大兴,等.试件特性对地震模拟振动台控制性能影响研究(Ⅱ)-对地震记录再现精度的影响及实时补偿[J].北京工业大学学报,2010,36(9): ??1199 - 1205. TANG Zhen-yun LI Zhen-bao,ZHOU Da-xing,et al.The effects on the earthquake simulation caused by the characteristics of the specimen in the shaking table testspart2: the effects on the replaying precision of the recorded seismic waves and the real-time compensation[J].Journal of Beijing University of Technology,2010,36(9 ): 1199 - 1205.
[8]Scharton T D.Force limited vibration testing monograph[M]. Nasa Reference Publication RP - 1403,2000:3 - 8.
[9]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.
[10]黄宝锋,卢文胜,宗周红.地震模拟振动台阵系统模型试验方法探讨[J].土木工程学报,2008,41(3):46-52. HUANG Bao-feng,LU Wen-sheng,ZONG Zhou-hong.Study on model experimental methodology utilizing the multiple earthquake simulation shake table system[J].China Civil Engineering Journal,2008,41(3):46-52.
[11]Dozono Y,Horiuchi T.Shaking-table control by real-time compensation of the reaction force caused by a nonlinear specimen[J].J.Pressure Vessel Technol,2004,126(1 ): 122 - 128.
[12]叶献国,徐勤,李康宁,等.地震中受损钢筋混凝土建筑弹塑性时程分析与振动台试验研究[J].土木工程学报, 2003,36(12):20-25. YE Xian-guo,XU Qin,LI Kang-ning,et a1.Experiment research on inelastic time-history analysis and shaking table test for a reinforced concrete building damaged in earthquake [J].China Civil Engineering Journal,2003,36(12 ): 20 - 25.
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