Research On Power Flow Transmission And Experiment Of Complex Vibration Isolation System

Vibration and noise control technique has very important theoretical value and wide application foreground in research. Vibration isolation is the most investigated and applied in all kinds of vibration control technology. In the paper a isolation system with flexible base and rigid floating raft is investigated using vibration power flow method. The main content and the innovations are as follow:The theoretical model of the isolation system with flexible base and rigidfloating raft is established. The flexible base is simulated by a steel plate. Theexpressions of power flow transferred to the floating raft and the flexible baseare deduced and the influence on power flow transmission by altering structureparameters is investigated. The conclusions are as follows: the power flowtransferred to the base can be reduced by increase the thickness of the flexiblebase and the stiffness of isolators; the power flow transferred to the base is less ifthe subsystem of the floating panel with machines fixed on is installed on themiddle of the flexible base than if it is not. The conclusions are useful forisolation design of engineering practice. This part is also the base for experiment.In order to validate the theoretical model by experiment, a test system forpower flow testing with PCL-818L and computer is developed by VB 6.0 andMATLAB. Testing data can be gathered, saved, displayed and analyzed with thetest system. Other functions could also be added to the system. Its functions ofgathering, saving, displaying testing data are achieved by VB 6.0, and theanalysis functions are achieved using COM subassembly which uses M functionfiles of MATLAB. The power flow testing system can not only apply for powerflow testing but also for other vibration testing research. The power flow testingmethod offered by this part could reduce testing cost and also make testingsystem alterable; therefore it has higher application value and is an innovation ofthe paper. The academic model for the isolation system with flexible base and rigid floating panel is validated by the experiment with equipments of our laboratory and the developed power flow testing system. Power flow transmission characteristic of the floating raft isolation system is investigated and the exactness and reliability of the theoretical model is validated. The influence to the power flow transmission by the system structure characteristic and installation scheme is also investigated, and some conclusions are obtained as follows: the power flow transferred to the floating raft and the base could be reduced by increasing the thickness of the base and the floating panel; the power flow transferred to the base is less if the floating panel is installed on the middle of the base than it is not. The beat phenomenon is investigated in the form of theory and experiment, and the paper points out that it is devastating. The results and conclusions could provide useful references to engineering practice. This part of the paper is though based on the investigation of former students, but electromotor is used to simulate the engineering practical condition, and also investigated the beat phenomenon, therefore it is also an innovation of the paper.