基于点云和设计模型的仿真模型快速重构方法

A rapid reconstruction method of simulation model based on point cloud and design model

随着产品装配质量要求的不断提高,为了在CAD模型仿真试验中快速且准确地表达零件实际加工质量,提出基于点云和设计模型的仿真模型快速重构方法.采用“一面两孔配准”方法,将零件实测点云数据配准到设计模型上;根据设计模型边界提取出曲面重构所需的控制顶点;采用非均匀有理B样条(NURBS)方法对控制顶点进行曲面拟合;根据仿真需求,结合边界表示法(BREP)和构造实体表示法(CSG)实现模型表面的局部和快速替换.在CATIA中开发基于实测点云数据和设计模型的仿真模型快速重构模块,和基于可拓展标记语言(XML)和特征完全匹配的数字预装配模块.以某航空企业典型零件和舱门预装配为例,验证该方法的重构精度和效率及其在预装配仿真中的高效性和准确性.

The high fidelity of CAD model in simulation test has been unsatisfied with the continuous improvement of product assembly quality requirements.A rapid reconstruction method of simulation model based on point cloud and design model was proposed in order to express the actual machining quality of parts quickly and accurately in the simulation experiment.The method of"one-plane and two-hole registration"was adopted to register the measured point cloud data to the design model.The control vertices in the boundary of the design model were extracted for surface reconstruction.Non-uniform rational B-spline(NURBS)method was used to fit the surface.The partial and efficient replacement of the model surface was realized,which combined boundary representation(BREP)and constructive solid geometry(CSG),with the simulation requirements.A rapid reconstruction module based on actual measured point cloud and design model,and a digital preinstalled module based on extensible markup language(XML)and fully features matched,were developed in CATIA.The reconstruction accuracy and efficiency of the proposed method,as well as its high efficiency and accuracy in the simulation of preassembly,were verified by taking a typical part of an aviation enterprise and assembly of aircraft door as examples.