Stochastic dynamics analysis of the rocket shell coupling system with circular plate fasteners based on spectro-geometric method

A numerical analysis model is established to predict the stochastic dynamic characteristics of the rocket shell coupling system. The virtual springs are employed to deal with the boundary conditions and assemble the sub structures. Firstly, the energy functional expressions of the sub structures are deduced with the medium-thick shell theory. Thereafter the equivalent dynamic model of the rocket shell coupling system is obtained. With the consideration of the random acceleration load excitation, the stochastic dynamic responses of the rocket shell coupling system are derived by solving the analytical model with the spectro-geometric method. By comparing with the results obtained with other numerical methods, the effectiveness of the proposed equivalent analysis model is successfully verified. Last but not the least, the parametric analysis is carried out to investigate the influence of some core factors on the stochastic dynamic response of the rocket shell coupling system.

Automated summary

A numerical analysis model is established to predict the stochastic dynamic characteristics of the rocket shell coupling system. The model effectively deals with boundary conditions and assembles sub structures using virtual springs. The energy functional expressions and equivalent dynamic model of the system are derived, and the stochastic dynamic responses are obtained by solving the analytical model with the spectro-geometric method. The proposed equivalent analysis model is verified to be effective by comparing with results from other numerical methods. Additionally, a parametric analysis investigates the influence of core factors on the stochastic dynamic response of the system.