The Dynamics Simulation And Software Design For The Whole-spacecraft Vibration Isolation Platform

With the rapid development of aviation and aerospace technology, the complex degree of spacecraft structures and space requirements are constantly raised, so that the issues of vibration and control have become more and more prominent. For different satellites, the same isolators are taken to satisfy performance requirements only with a slight adjustment of the parameters of the isolators. In view of this duplicate work which wastes a lot of manpower and material resources, it is needed to develop a specific software platform, which replaces the complex and difficult MSC.PATRAN orders, for the whole spacecraft isolation in order to meet the needs of our customers.In this paper, the mathematical model of the visco-elastic damping material is established and the measurement methods are given out. We have established the finite element of damping material. After then, we apply the damping material to the isolator. The scale model of the whole-spacecraft passive vibration isolation platforms are set up by the finite element method. By normal modes analysis, complex eigenvalue analysis, we obtain the damping sheets and the damping area of each sheet when the effect of the vibration isolation is the best. To the best damping area, we have done the frequency response analyze and compare the transmissibility results before and after isolation, from which, we find the isolator can decrease the vibration response very well.This paper also studies on the platform of the whole-spacecraft vibration isolation systems. Interface is obtained by the software VC++ which takes the place of the complex orders of Patran and makes it easy to operate. Users just need to input the parameters of the isolator and choose the satellite, the system can transfer Patran to set up model, divide finite element, define the materials and properties, set payloads, choose the style of the analysis and apply Nastran to complete the calculation. In this paper some application examples are presented to be compared with the experimental results. From the results, we know that the frequency error keeps within 2% and the transmissibility error keeps in 30% because of the influence of many unknown factors, and the trends of the transmissibility obtained by simulation and experiment are the same. So, we regard that the results which are obtained by the finite element software Patran/Nastran are verified by the experiment. The platform of the isolation system is extended to the actual satellite and we can change the parameters of the isolator simply to look for the best damping effect. Simulation results show that the transmission of the main node has been decreased more than 40%, and the isolator has great potential application to actual satellite launching in future.