Data exchange method for heterogeneous CAD model in spacecraft development process

Abstract

A data exchange method for a heterogeneous CAD model in the spacecraft development process comprises the following steps that 1, non-geometric information definition is performed to determine the classification, names, meanings and contents of non-geometric information; 2, the non-geometric information is extracted in source CAD software, a source CAD model containing the non-geometric information is read, a non-geometric information extraction module is called to extract the non-geometric information saved in the source CAD model and save it to an XML file; 3, an initial target CAD model is generated; 4, the non-geometric information is imported to the initial target CAD model to get a final CAD model. By adopting the steps, the data exchange method can successfully perform data exchange between heterogeneous CAD systems, overcomes the defects in the prior art, geometric information can be transferred, non-geometric information can be also transferred, the integrity and consistency of data exchange are ensured, accordingly artificial participations are decreased, and the spacecraft development efficiency is improved.

Description

technical field [0001] The invention relates to a data exchange method for heterogeneous computer-aided design (CAD) models in the development process of spacecraft, in particular to a data exchange method for three-dimensional models between heterogeneous CAD software in the development process of spacecraft , which can convert the geometric information and non-geometric information of heterogeneous CAD models at the same time, and realize the association of the two, so as to meet the requirements of data exchange and subsequent engineering application, and belongs to the field of computer-aided design and manufacturing (CAD / CAM). Background technique [0002] Spacecraft, also known as space vehicles and space vehicles, refers to various types of aircraft that operate in space according to the laws of celestial mechanics and perform specific tasks such as exploration, development, and utilization of space and celestial bodies. Spacecraft design is a multidisciplinary design...

AI Technical Summary

Problems solved by technology

[0004] At present, most existing heterogeneous CAD model data exchange methods are methods based on intermediate files, such as methods based on the STEP (Standard for the Exchange of Product Model Data, product model data interaction specification) standard, which is to use STEP intermediate files (* .stp) to convert heterogeneous CAD models, but this method can only convert the geometric information of the model, but cannot convert non-geometric information such as product quality characteristic information, attribute information, technical requirements, etc., and the current general method cannot realize non-geometric information. The association between geometric information and geometric information requires companies to hire more people to manually supplement these non-geometric information and manually add the association between non-geometric information and geometric information, thus increasing the product design cycle and development costs

In addition, in the design stage of spacecraft products, for the convenience of CAD modeling, designers usually establish multiple coordinate systems in the CAD model, while in the process of final assembly design, the coordinate system that designers need to refer to is the origin The coordinate system located at the center of the installation hole, this coordinate system can be called the R coordinate system, the current general conversion method cannot automatically identify the R coordinate system, nor can the CAD model be converted based on the R coordinate system, resulting in conversion The final model cannot meet the requirements of subsequent engineering applications

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