Dynamic Modelling And Analysis Of Multifunctional Vibration-Absorption Structure

The multifunctional structure technology is an effective way to reduce the weight,increase the usable space,improve the payload ratio and prolong the life of the spacecraft.In this paper,taking a multifunctional vibration-absorption structure as the research object,its dynamic characteristics have been systematically studied in respects of the theoretical modelling,the numerical simulation,the experiments,etc..The main work of this paper can be summarized as follows:1.The hyperelastic constitutive model of the elastic components in the multifunctional vibration-absorption structure has been established.The hyperelastic properties of the elastic components have been analyzed.(1)Based on the phenomenological theory,a hyperelastic constitutive model has been put forward.The relationships of the stress versus the strain under the uniaxial tension,pure shear and biaxial tension deformation modes have been derived out.The numerical simulation and the experimental verification for the new constitutive model have been carried out.(2)According to the hybrid molecular chain network theory,a hyperelastic constitutive model has been given.The model parameters relate with the molecular structure of the rubber materials.The numerical simulation and the experimental verification for the proposed constitutive model have been conducted.(3)Considering the polymer molecular volume,the topological constraints and the nonaffine deformation,a hyperelastic constitutive model for the elastic components has been established.The numerical simulation and the experimental verification for the new constitutive model have also been carried out to verify its correctness and suitability.2.The viscoelastic constitutive model of the elastic components in the multifunctional vibration-absorption structure has been established.The viscoelastic properties of the elastic components have been researched.(1)The parameteric determination of the Havriliak-Negami model has been brought out.The numerical simulation and the experimental verification have been supplied to validate the model's correctness and effectiveness.(2)The parameteric identification of the modified fractional Zener model has been given.The numerical simulation and the experimental verification have also been worked out to validate the model's correctness and effectiveness.3.Since the hyperelastic properties and viscoelastic properties of the elastic components in the multifunctional vibration-absorption structure have been studied,the generalized viscoelastic constitutive model has been established.(1)In order to obtain the three-dimensional generalized viscoelastic constitutive model of the rubber-like materials,a one-dimensional generalized viscoelastic constitutive model has been given based on the general Maxwell model and the fractional derivation method.(2)The three dimensional generalized viscoelastic constitutive model of the elastic components has been established by extending the one-dimensional generalized viscoelastic constitutive model for the three-dimension.And the three-dimensional generalized viscoelastic constitutive model has been linearized.(3)The parameteric determination and the numerical calculation methods of the proposed model have been given.And the generalized viscoelastic constitutive model has been simulated,analyzed,and verified.4.The dynamic model of the multifunctional vibration-absorption structure has been given,the model parameters have been identified,and the dynamic characteristics have been analyzed.(1)The dynamic parameters have been determined by testing.Substituting the obtained dynamic parameters into the dynamic model of the multifunctional vibration-absorption structure,the dynamic characteristics have been simulated and analyzed.(2)Making use of the modelled dynamic model of the multifunctional vibration-absorption structure,the dynamic responses and the energy dissipation have been investigated.For the multifunctional vibration-absorption structure,the hyperelastic and viscoelastic properties of the elastic components have been investigated in this dissertation.Its dynamic model has been supplied and the dynamic parameters of the multifunctional vibration-absorption structure have been determined.The dynamic characteristics,dynamic responses and the energy dissipation have been simulated and analyzed.This dissertation can provide meaningful theoretical guide for the aerospace engineering application of multifunctional vibration-absorption structure technology.