A mixed conversion method for rocket fluid-solid loads based on mesh classification

Abstract

The invention relates to a method for hybrid transformation of rocket fluid-solid loads based on grid classification, which includes the following steps: 1) screening inconsistent aerodynamic points in areas that do not match the shape of the structure model in the fluid model; 2) projecting all inconsistent aerodynamic points to the structure In-plane composed of model nodes; 3) Obtain the structural points in the area with inconsistent shape; 4) For the structural points in the area with inconsistent shape, use the force equivalent method to perform load conversion. point is used as the structural point of the area with consistent shape, and its load is interpolated by pressure interpolation method, and the input of interpolation is the consistent aerodynamic point in step 1). Compared with the prior art, the invention has the advantages of automatic identification, accurate modeling, conforming to engineering practice and the like.

Description

technical field [0001] The invention relates to the field of rocket structure design, in particular to a rocket fluid-solid load hybrid conversion method based on grid classification. Background technique [0002] When designing the rocket structure, it is necessary to convert the aerodynamic load into the structural load. In the process of converting the fluid load of the rocket structure to the structural load, the existing conversion methods use inverse distance interpolation, surface spline interpolation, Kriging interpolation and Pressure interpolation methods such as BP neural network interpolation method, the advantages of the above methods are that the pressure distribution after interpolation can be guaranteed to be accurate, but the disadvantage is that the geometric outer surfaces of the fluid model and the structural model are required to be consistent; the force equivalence method is used to convert the The force is equivalent to the nodes of the structural mode...

AI Technical Summary

Problems solved by technology

[0002] When designing rocket structures, it is necessary to convert aerodynamic loads into structural loads. In the process of transforming rocket structural fluid loads into structural loads, the existing conversion methods use inverse distance interpolation, surface spline interpolation, Kriging interpolation and BP neural network interpolation method and other pressure interpolation methods, the advantage of the above method is that the pressure distribution after interpolation can be guaranteed to be accurate, but the disadvantage is that the geometric outer surface of the fluid model and the structural model are required to be consistent; The force is equivalent to the nodes of the structural model. The advantage of this method is that it does not need to ensure that the geometric outer surfaces of the fluid model and the structural model are consistent, but the disadvantage is that the resultant force and moment are equal within the distribution range, but the force distribution law is accurate. sex is relatively poor

Images