The Research On Network Pseudo-dynamic Test Of Structural And Control Method Of Shaking Table

Structural seismic testing is a necessary link in the research of seismic. With the development of the control theory, computer technology and network technology , seismic test methods tends to large-scaled, networked, digitized, accurate. Application of new testing methods on quasi-static testing, pseudo-dynamic testing, shaking table test is the hotspot of the research of the seismic testing of structures, especially the remote pseudo-dynamic testing based on network and the shaking table testing based on accuracy control method.This paper shows the basic principle and networked trend of the pseudo-dynamic testing, analyses the rules of the remote pseudo-dynamic test platform which called NetSlab and the methods of the remote pseudo-dynamic test. Aiming to the requirement of Hunan university joining to the NetSlab test, a improved scheme is proposed to include the MTS electrohydraulic servo system into NetSlab, which is to develop a suit of test program via MTS software development interface:one is named MTS remote server serve as the interface between local test device and NetSlab test software, and the other is a standard ActiveX component to be used by NetSlab test software, which make the test program need not to relate network communication and order execution, but only perform the remote control and feedback through function call. A series of real remote pseudo-dynamic test among Hunan university, Southern California university, Harbin Institute of Technology, Tongji university demonstrate that this plan is available and steady and the developed program make the structure laboratory of Hunan university able to take part in the NetSlab test.The force feedback error of network delay is a important factor that cause the accumulated errors in the network peudo-dynamic testing. This article designs a compensator based on BP neural network to compensate the errors online, result shows that it is effective.In the shaking table test, one of the important component is how to compensate the output error of the earthquake wave. To the shaking table drived by then MTS electrohydraulic servo system, double closed-loop control system is presented in this paper which is the inner traditional PID controller and the outer iterative learning control. Real tests demonstrate that if the control parameters is setted properly, the specimen can track the desired movement accurately.