| st The 21 century is an information era of industry; therequest of anti-microvibration on high-fine machining, precision test and scientific experiment become higher and higher, which need a large quantity of work platforms. When the size of the platform is small, it can be designed according to .Code for Vibration Isolation Design Code.. However when the size of the platform is large,or it works in a wide frequency range, or the requirement of vibration control, it is urgent to choose the material ofplatform, arrange isolator and determine thedesign parameters of isolator for obtaining the expected effect of vibration isolation. Aiming at the above circumstance, an actual example about testing table for impedance of some academe has been studied by use of space dynamic finite element program in this thesis. This paper analysis the factors which influence the dynamic characteristics of the elastically supported platform structure. Calculation indicates: structural parameters of the platform(material, shape), performance parametersof the elastic supports (stiffness, damping) and arrangementof the elastic supports (position, quantity) influence dynamic characteristic of structure. So we must choose reasonable parameters according physical circumstance. The performance testingof a testing table of a certain academe has been processed. And the testing result has been compared with the theory result. In the last, the modern control theory and SIMULINK in MATLAB have been integrated together, and it has been applied in active control of the platform structure elastically supported; a mechanical model and an equation of motion in state space have been established. Based on COC, dynamic response of the platform structure elastically supported has been studied under simple harmonic load; the influence of different values of weight function to the active control efficiency of the structure has also been discussed.
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