Digital twinning-based product quasi-physical assembly model generation method and implementation framework

A technology for assembling models and physical models, which is applied in 3D modeling, image data processing, and details involving processing steps, etc. It can solve the problems of insufficient geometric accuracy and lack of high-fidelity expression means for product assembly, so as to improve assembly quality and The effect of assembly efficiency

Active Publication Date: 2020-05-12
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the real geometric accuracy in the current product assembly modeling process is not enough, and the high-fidelity expression means of product assembly is lacking. A digital twin-based product quasi-physical assembly model generation method and implementation framework are provided.

Method used

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  • Digital twinning-based product quasi-physical assembly model generation method and implementation framework
  • Digital twinning-based product quasi-physical assembly model generation method and implementation framework
  • Digital twinning-based product quasi-physical assembly model generation method and implementation framework

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Embodiment 1

[0038] Such as figure 1 and 2 As shown, the digital twin-based product quasi-physical assembly model generation method of this embodiment includes the following steps:

[0039] (1) Acquisition, processing and expression of discrete point cloud data on the surface of physical parts

[0040] Use the perception measurement equipment at the physical entity layer to collect discrete point cloud data on the surface of physical parts in key assembly processes, and use the analysis process of multi-view point cloud alignment, error point elimination, point cloud filtering, and data reduction for the original point cloud data It is processed to obtain the preprocessed part surface measured point cloud data, and a part surface model based on the measured point cloud data is generated through a triangulated mesh algorithm.

[0041] The key assembly process in the product assembly process is the assembly process that contains key assembly features that significantly affect the assembly ...

Embodiment 2

[0052] Such as image 3 and 4 As shown, this embodiment discloses a digital twin-based product quasi-physical assembly model generation method implementation framework, including a physical entity layer, a twin data layer and a virtual entity layer;

[0053] The physical entity layer refers to the collection of all physical entities objectively existing in the workshop, including raw materials, material consumables, processing equipment, assembly equipment, fixtures, operators, workshop environment, and equipment for sensing measurement data. Among them, deployed in the workshop Perceptual measurement equipment includes three coordinate measuring machines, laser scanners, laser trackers, total stations, photogrammetry equipment, force sensors, speed / acceleration sensors, temperature / humidity sensors and other sensory measurement equipment, which combine physical physical layer The manufacturing process and assembly process carry out data collection, processing and fusion upda...

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Abstract

The invention relates to a digital twinning-based product quasi-physical assembly model generation method and an implementation framework. The implementation framework comprises a physical entity layer, a twinning data layer and a virtual entity layer, a product physical object and a virtual digital model are deeply fused through an information physical fusion technology; discrete point cloud dataof the surface of the part are acquired by means of perception measurement equipment of a physical entity layer, and through measurement data preprocessing, assembly error compensation data of a twindata layer is introduced to reconstruct geometrical characteristics of the surface of the part, so that a part quasi-physical model is generated; and assembly positioning constraint information is extracted according to the virtual entity layer, and real feature element registration and assembly repositioning are performed on the part quasi-physical model, thereby obtaining a product quasi-physical assembly model. The method can be used for high fidelity expression of a product assembly model, the constructed product quasi-physical assembly model can also be used as the basis of three-dimensional assembly process design and assembly precision prediction, and support is provided for intelligent closed-loop control of the complex product assembly process.

Description

technical field [0001] The invention relates to the technical field of product virtual assembly, in particular to a digital twin-based method for generating a pseudo-physical assembly model of a product and an implementation framework. Background technique [0002] Today, with the continuous development of high-end and high-precision mechanical equipment, higher and higher requirements are put forward for the design, manufacture, assembly, and testing of mechanical products. In the design stage of the product, the guarantee of the assembly accuracy of the mechanical system mainly comes from the tolerance design of the parts and the matching relationship between the parts. In the actual assembly process of the product site, it is coupled with external loads such as clamping positioning, load bearing, and temperature. The mechanical system will As the assembly process completes the transfer and accumulation of assembly deviations, the product assembly errors will increase and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/521G06T7/33G06T7/66G06T17/20G06T19/20
CPCG06T7/521G06T7/33G06T7/66G06T17/20G06T19/20G06T2207/10028G06T2207/30164G06T2219/2008G06T2200/08
Inventor 刘晓军易扬倪中华张人超张意
Owner SOUTHEAST UNIV
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