Carrier-rocket-oriented method for simplifying fluid and solid coupling simulation geometric models

A fluid-solid coupling and geometric model technology, applied in geometric CAD, design optimization/simulation, special data processing applications, etc., can solve problems such as complex problem objects, unfavorable coupling simulation analysis, lack of model conversion templates, etc., to solve manual operations There are many repetitions, which is convenient for flexible expansion and configuration, and improves the effect of the work process

CN107784181AActive Publication Date: 2018-03-09BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-03-09

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Abstract

The invention discloses a carrier-rocket-oriented method for simplifying fluid and solid coupling simulation geometric models. The carrier-rocket-oriented method includes steps of 1), retrieving all components in assemblies and rejecting the components in unqualified shapes; 2), selecting optional one sheet to be used as a center, retrieving surrounding sheets and combining the sheets with the selected sheet to form a closed body; 3), retrieving factors of all the components under the assemblies, selecting geometric features, selecting geometric feature faces by means of feature recognition and labeling or deleting attributes for the geometric feature faces; 4), selecting the geometric features, setting size thresholds, comparing the sizes of the selected geometric features to the size thresholds and rejecting the geometric features which do not conform to requirements; 5), judging whether geometric simplification is used for hydrodynamics profession or not; 6), computing encircling boxes of the components, solving integral shapes of the assemblies and shelling the integral assemblies to obtain geometric shapes of the integral assemblies; 7), selecting updated assemblies, and creating spatial domains so as to complete geometric simplification work oriented to fluid and solid coupling simulation. The geometric feature faces selected by means of feature recognition at the step 3)correspond to the geometric features selected at the step 3).
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Description

technical field

[0001] The invention relates to the technical field of aerospace product system simulation, in particular to a method for simplifying a fluid-solid coupling simulation geometric model for launch vehicles. Background technique

[0002] CAD (Computer Aided Design) 3D design software and CAE (Computer Aided Engineering) analysis and simulation software are tools that have been widely used in the design process of launch vehicles. In order to realize data sharing among different software systems, some integrated application development has been carried out. The results Significant improvement. But overall, the design analysis process from CAD to CAE is not very smooth. In a nutshell, CAD models are oriented to the manufacturing process, and are rich in details and large in scale, while CAE models need to be appropriately simplified and idealized. How to convert CAD models into source models required for CAE simulation has become a difficult point in data sharing...

Examples

Embodiment Construction

[0053] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0054] 1. If figure 1 As shown, retrieve all components in the assembly, calculate the total surface area of ​​all components and the total volume of all components, calculate the critical value combination according to the given surface area percentage and volume percentage threshold, and combine the critical value combination with all components Compare one by one, if a component is smaller than the critical value combination, it will be removed from the assembly. The specific calculation method of the critical value combination is:

[0055] (1) A=[S, V], where A is the combination of critical values, S is the critical value of surface area, and V is the critical value of volume.

[0056] (2) S=S1*Ps, where S1 is the total surface area of ​​all components, and Ps is the given surface area percentage;

[0057] (3) V=V1*Pv; where V1 is t...