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VIrtual assembly method based on 3-D VRML model

A virtual assembly and assembly method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of system integration difficulties, not an independent system, inconvenience, etc.

Inactive Publication Date: 2007-03-07
TSINGHUA UNIV
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Moreover, some VRML-based assembly systems are subject to such restrictions, so they can only rely on the support of other CAD systems to complete assembly operations, assembly planning, etc. VRML models are only used for browsing functions, so such systems do not Not a fully "VRML-based" structure, nor a stand-alone system
This causes inconvenience during the use of the system, and also brings difficulties to the integration of the system with other systems.

Method used

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  • VIrtual assembly method based on 3-D VRML model
  • VIrtual assembly method based on 3-D VRML model
  • VIrtual assembly method based on 3-D VRML model

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Embodiment Construction

[0113] The assembly of the component model should finally be implemented on the geometric constraints of the component surface. There are many kinds of assembly methods, and the commonly used ones are mainly three types: against, axis alignment (Fit), and surface alignment (Align).

[0114] Convention: Point P 1 and The body where it is located is the assembly base, is the normal vector of the plane, point P i1 and The body where it is located is a component (P i0 , P i1 , P i2 , P i3 , Indicates the positioning point and positioning normal vector of the i-th component), is the normal vector of the plane, and the assembly operation is to assemble the components to the assembly base.

[0115] 1.Against—face lamination

[0116] To achieve veneer assembly (Fig. 2(a)), two constraints need to be satisfied:

[0117] 1) End coincidence: P i 1 - ...

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Abstract

The disclosed method is a method of remote synergic direct preassembling in inter-platform. The method is capable of recovering primal geometric information of basic assembly parts and components. Thus, VRML possesses both functions of browsing network and assembling capability. The method puts forward three assembling methods: fitting of cylindrical shaft and shaft hole, fitting of face and face, aligning of faces, realizing assembling restriction correctly. The method possesses functions of integrated assembly manipulation between VRML models generated from isomerical CAD system. advantages are: easy implementation, remote synergic assembling, high computational efficiency, less than 0.02% computing error, wide applicable to virtual design system based on network.

Description

technical field [0001] The method of virtual assembly based on 3D VRML model belongs to the field of computer aided collaborative product design tools. Background technique [0002] For the integration of heterogeneous CAD information, the commonly used solution is information integration based on the STEP standard. Since the STEP standard is still in the development stage, the application protocols adopted by various software manufacturers are not completely consistent, and it is difficult to achieve general integration. The specialized integration method based on point-to-point has been well applied. With the continuous development of CAD technology, "virtual factory" and "dynamic enterprise alliance" will become the main working methods within and between enterprises. In this application background, the point-to-point specialized integration method cannot meet the requirements , Moreover, STEP-based CAD model files are usually relatively large, limited by network transmi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 田凌王巧玉尤国平陈继忠童秉枢
Owner TSINGHUA UNIV
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