An integrated method for design and analysis of plate and shell structures based on cad clipping surfaces

Abstract

The invention provides a shell structure design and analysis integrated method based on a CAD trimmed surface. The method comprises the step of directly applying a designed shell structure containing a trimming feature in the CAD to mechanical CAE analysis by extracting and processing a STEP (product data exchange standard) format file of the shell structure based on the universal geometric data exchange international standard format STEP, wherein a grid division and like pre-processing operation of the structure are unnecessary to perform, and the structure design efficiency is improved. Aiming at the trimmed unit, the fast and accurate integral of the trimming unit can be realized through the unit mixing technology. Compared with the prior art, the method provided by the invention has strong universality, and is easy to popularize and use in the design and analysis of the engineering structure.

Description

technical field [0001] The invention relates to the fields of computational mechanics and computer-aided design, in particular to an integrated method for design and analysis of plate and shell structures based on CAD trimmed surfaces. Background technique [0002] Non-uniform rational B-splines (NURBS) is a commonly used geometry description method in computer-aided geometric design (CAD) software. The monolithic NURBS surface has the characteristic of tensor product, so it can only describe relatively simple geometric shapes, such as shapes with quadrilateral features, etc. For more complex geometric shapes, such as surfaces with holes, etc., they are often described by clipping surfaces. The clipping surface defines one or more clipping curves with directions in the parameter domain space of the original NURBS surface. The right area of ​​the curve is the clipped area, and the left area is the reserved area. The clipping curve does not change the parameter domain space o...

AI Technical Summary

Problems solved by technology

These three methods propose a way to deal with clipping units, but they do not involve the general international standard for CAD data exchange, and their versatility is limited, so it is difficult to be popularized to a certain extent.

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