Real-time Hybrid Testing Based On Joint Loading Of Shake Table And Actuator For Cable Rack System

According to the requirements of lifeline engineering,the cable rack equipment in the communication room needs to have a certain degree of reliability under the action of earthquakes.Pure finite element simulation is difficult to reflect the seismic damage effect of the strong nonlinearity of the cable rack structure;the shake table test for the cable rack system in the entire computer room will consume a lot of manpower and material resources.Therefore,it is urgent to introduce cost-effective test methods to guide the layout and installation of the cable rack grid array in the computer room.The real-time hybrid testing based on the joint loading of the shake table and the actuator combines the advantages of the shake table test and the conventional real-time hybrid testing,and can reproduce the time history response of complex structures under the action of ground motion.This paper introduces the test method into the field of communication equipment cable rack test,and provides a new idea for the test of cable rack system in the computer room.The main research contents and conclusions of this article are as follows:(1)The real-time hybrid testing method of the cable rack system based on the joint loading of the shake table and the actuator is studied,and the feasibility of the real-time hybrid testing for the cable rack system is verified through the hybrid simulation analysis.The simulation results show that the inverse model delay compensation method has high stability;in the working condition of the inverse model method for delay compensation,the larger the proportion of the boundary degree of freedom quality in the test substructure,the greater the displacement tracking error.(2)For the cable rack system,the real-time hybrid testing method based on the joint loading of the shake table and the actuator is studied,and the hybrid simulation analysis verifies the feasibility of the real-time hybrid testing for the cable rack system.The simulation results show that the inverse model time-delay compensation method has high stability;when the inverse model method is used for time-delay compensation,the displacement tracking error increases with the increase of μ.(3)A series of real-time hybrid testings were carried out for the cable rack system,which verified the feasibility of the real-time hybrid testing in the field of cable racks.The results show that the real-time hybrid testing of the cable rack system based on the joint loading of the shake table and the actuator reproduces the displacement and acceleration response of the cable rack system under earthquake action,and its test effect is better than the traditional free boundary substructure shake table test.