Modeling method of surface fold morphology of square solar sail

Abstract

The invention discloses a modeling method of the surface fold morphology of a square solar sail. The modeling method comprises the following steps: firstly, aiming at a square film solar sail structure, determining a stress field distribution cloud picture of the square film solar sail structure so as to obtain a fold area; and secondly, putting forward a new fold morphology description equation, and establishing a fold morphology model which is closer to practical situations by introducing an exponential decay function. The method utilizes an Airy stress field distribution theory, eliminates boundary influence through a stress superposition rule, and obtains the stress filed distribution cloud picture of the film solar sail structure so as to further determine the fold area. On the basis, a more accurate fold morphology description equation is put forward, the generalized equation of a film fold parameter is established on the basis of a vonKarman large deflection equation, a stress extremum method is adopted to obtain a relational model of the fold morphology and fold direction tensile stress, the modeling method is simple in solving, and meanwhile, the obtained fold morphology is closer to the practical situations.

Description

technical field [0001] The invention belongs to the field of mechanical engineering, and relates to a modeling method for the surface wrinkle shape of a solar sail structure, in particular to a modeling method for the surface wrinkle shape of a square solar sail, which is used to more accurately describe the surface wrinkle shape. Background technique [0002] Solar sails need to obtain propulsion through weak sunlight pressure, so solar sails are required to have a large sail surface and light structural quality, and film materials have become a popular choice for light weight, small storage volume, low cost, and easy folding. Ideal sail material. However, the bending stiffness of the film is small, and it is prone to local instability when subjected to external loads to cause wrinkles. The photon scattering caused by the film wrinkles makes the effective thrust generated by the solar sail significantly reduced. Therefore, accurately describing the deformation mechanism of...

AI Technical Summary

Problems solved by technology

The first way can analyze the folds through general-purpose software, but the defects introduced will affect the analysis results. The second way does not need to introduce any defects, but the bifurcation law needs to be introduced in the analysis process to track the bifurcation path, it is more difficult to solve

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