基于虚拟振动台的实时耦联动力仿真试验  

Real-time dynamic hybrid simulation testing based on virtual shaking-table

作　　者：汪强[1] 王进廷[1] 金峰[1] 张楚汉[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《地震工程与工程振动》2009年第6期25-32,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50779021;90715041)

摘　　要：实时耦联动力试验(RTDHT)是一种将物理模型试验与数值求解计算实时耦联在一起的新型结构动力试验方法。本文采用SIMULINK对液压伺服振动台系统进行了仿真,建立虚拟振动台模型对真实振动台进行离线调试。并提出基于虚拟振动台进行实时耦联动力仿真试验,从而对真实实时耦联动力试验进行指导的思想。仿真结果表明,虚拟振动台可以很好地仿真真实振动台的动力特性,离线调试结果应用于真实振动台能够得到优良的控制性能;基于虚拟振动台的实时耦联动力仿真试验能够反映真实实时耦联动力试验中存在的时滞以及由此而可能导致的系统失稳问题。采用预测补偿算法对时滞进行了补偿,结果表明补偿算法消除了时滞的影响,试验系统稳定且试验结果与数值计算结果吻合得较好。基于虚拟振动台对实时耦联动力试验进行研究,既能对真实试验提出指导又可避免试验系统失稳对设备的损害,是一种实用且必要的研究手段。Real-time dynamic hybrid testing（RTDHT） is a novel testing method coupled of physical substructure testing and numerical substructure calculation.In this paper,hydraulic servo shaking-table is modeled in SIMULINK and the offline tuning is performed based on it.A new idea of RTDHT pre-testing based on virtual shaking-table is realized.The RTDHT pre-testing can be used to guide the real RTDHT tests.A high degree simulation of shaking-table properties can be achieved by the virtual shaking-table.RTDHT based on virtual shaking-table can truly reflect the existence of time delay and possible system instability.Prediction algorithm is used to compensate the time delay,the results show that delay can be eliminated and the system retains the stability.The testing results coincide well with numerical results.It is concluded that the RTDHT pre-testing based on virtual shaking-table not only offers guidance on real RTDHT tests but also prevents possible equipment damage caused by system instability.

关 键 词：实时耦联动力试验 虚拟振动台 离线调试 时滞补偿 

分 类 号：P315.974[天文地球—地震学] TU317[天文地球—固体地球物理学]