Structural dynamics analysis method and system for inflatable reentry vehicle considering nonlinear influences

Abstract

The invention relates to a structural dynamics analysis method and system for an inflatable reentry vehicle considering nonlinear influences, and belongs to the field of areospacecraft reentry and return. According to the structural dynamics analysis method and system for the inflatable reentry vehicle considering nonlinear influences, characteristics of statics, modality and thermal modality of the inflatable reentry vehicle under influences of different inflation pressures, film thicknesses, hypersonic flow field pressures, temperatures and other nonlinear factors can be accurately described. Calculation methods of fluid-solid unidirectional coupling and thermo-solid unidirectional coupling are successfully introduced into a nonlinear structural dynamic simulation module, combined with an actual trajectory of the inflatable reentry vehicle, and an influence rule of changes of internal inflatable gas parameters on characteristics of statics, modality and thermal modality of the inflatable reentry vehicle is truly expressed. The structural dynamics analysis method and system for the inflatable reentry vehicle considering nonlinear influences have the advantages that the problem ofthe existing study on structural dynamics of inflatable reentry vehicle that the consideration of flow field non-linear and material none-linear is insufficient will be hopefully solved, and valuablereferences can be provided to shape-preserving design and structural safety design of the inflatable reentry vehicle.

Description

technical field [0001] The invention relates to a structural dynamics analysis method and system of an inflatable reentry aircraft considering nonlinear effects, and belongs to the field of spacecraft reentry and return. Background technique [0002] The inflatable reentry vehicle has the advantages of large payload ratio, small launch volume, and flexible maneuverability when returning. It can improve the reentry and return capabilities of spacecraft and may become a new type of space-to-earth round-trip transportation. The inflatable reentry vehicle is in a folded state when it is launched and in orbit, and it can be expanded by inflation to realize the functions of aerodynamic deceleration and thermal protection when reentry and return. The space inflatable reentry vehicle needs to bear the impact of supersonic air flow and huge aerodynamic thermal load after entering the atmosphere. The influence of flow field nonlinearity and material nonlinearity on the inflatable reen...

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Problems solved by technology

[0003] The technical problem solved by the present invention is: to overcome the problem of insufficient consideration of the influence of flow field nonlinearity and material nonlinearity in the numerical research of the existing structural dynamics of the inflatable reentry vehicle in the prior art, and propose an inflatable reentry vehicle considering the nonlinear influence. The structural dynamics analysis method and system of the inflatable re-entry vehicle, combined with the actual flight trajectory of the inflatable re-entry vehicle, through the introduction of the calculation method of fluid-solid one-way coupling and thermo-solid one-way coupling in the structural dynamics model, the inflation pressure , film thickness, hypersonic flow field pressure, and temperature. The accurate description of the static characteristics, modal and thermal modal characteristics of the inflatable reentry vehicle under the influence of nonlinear factors such as Conformal design and structural safety design of aircraft provide valuable reference

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