Structure Analysis And Vibration Isolation Optimization Of A Satellite

In recent years,the satellites have experienced increasingly worse dynamical environments during launching process,so the design requirements for satellite structures have been continuously increasing.In order to adapt to the more harsh environment of launching,at the same time,the goal of fast response to satellites should be fulfilled,the stiffness and strength requirements of satellites and the requirement of vibration reduction of whole satellite or load compartment should be satisfied.The satellite structure analysis and reduction vibration optimization is of great significance.In this paper,a type of truss main bearing structure of the satellite is the research object.Satellite structural mechanics response analysis based on the finite element method,the metal rubber shock absorber nonlinearity and its application principle,vibration reduction optimization of whole spacecraft with metal rubber isolators and other key technologies is been studied deeply.The main research contents and achievements are as follows:A three-dimensional finite element model of a satellite structure was established.The finite element software MSC.Nastran was used to perform the quasi-static analysis,the stability analysis,the modal analysis,the frequency response analysis and the random response analysis of the satellite structure respectively.Mechanical response and dynamic response were analyzed and studied.The nonlinear characteristics and application principle of metal rubber isolators are studied.Based on the static and dynamic experiments on a certain type of metal rubber isolators,an equivalent linear parameter calculation method based on experiment is proposed and the validity of this method in finite element analysis is verified.An equivalent linear vibration reduction optimization design method is proposed for the satellite structure with nonlinear isolators.Based on the genetic algorithm,the vibration reduction optimization of the whole satellite of a certain type of satellite structure is carried out.At the same time,the simulation analysis of the satellite structure after optimization is given out.In a word,this paper realizes the vibration reduction optimization of whole satellite with metal rubber isolators,and the results can provide reference for the design of satellite vibration reduction.The research methods can be applied to the analysis and design optimization of similar structures.