Scaffolding Passive Damping Of The Satellite And The Rocket Adapter Analysis Methods And Design Techniques,

Application of whole-spacecraft vibration isolation technology can attenuate dynamic loads for the launch vehicles.Whole-spacecraft vibration isolation may be realized by two approaches.One is using isolators which are inserted into the interface between the spaceship and the launch vehicle.The other is introducing a new payload attach fitting(PAF) which possesses soft ride capability as an alternative of the PAF in use. This thesis mainly focuses on the second approach,thus developing a new passive isolated PAF to reduce the response of the spacecraft while maintaining the attaching characteristics.Main contents are listed as follows:1.Compared with several schemes,the truss structure is regarded as a proper type and selected as the new PAF configuration.The number of the truss bar is set by preliminary analysis to keep similar stiffness with the original PAF.The structure of the truss bar applies isolated tube with sleeve,which consists of outer tube,inner tube and damping sandwich layer.Variation of the single tube dynamic characteristic along with the length of the damping layer and the material parameters is analyzed.2.By using the visco-elastic theory,the model condensation technique and the equivalent visco-damping method,a method of modeling to reduce the dynamic model of the visco-elastic damping component is introduced.An example indicates the accuracy of the reduction method.The condensed dynamic model can represents frequency dependent damping of the component at multi-directions,and can be used to analyze the responses in both frequency-domain and time-domain with a small scale computing.3.The dynamic characteristic of the isolated PAF is evaluated.The normal modes of the payload-PAF combination structure are analyzed.Virtual dynamic environment test and the coupled loads analysis are also performed.The results shows that the attachment characteristic of the new designed PAF is similar to which of the original PAF,and the frequency responses as well as the transient responses of the payload are reduced.The new designed PAF can perform well to reduce vibration levels. 4.An optimization approach of the isolated PAF structural parameters is introduced. Influence of structural parameters on the PAF performance is studied.Optimization design platform is established by multi-target optimization theory.The isolated PAF by optimization meets all general requirements such as weight,strength and stiffness, and can reduce dynamic loads effectively.