基于拟合投影的车身老鼠洞检查方法研究  

Research on rat hole inspection method of vehicle body based on fitting projection

作　　者：郭鹏[1] 董玉德[1] 吴文哲 GUO Peng;DONG Yu-de;WU Wen-zhe(School of Mechanical Engineering,Hefei University of Technology,Hefei Anhui 230009,China)

机构地区：[1]合肥工业大学机械工程学院,安徽合肥230009

出　　处：《图学学报》2021年第5期809-815,共7页Journal of Graphics

基　　金：国家自然科学基金项目(51775159)。

摘　　要：汽车车身在设计制造过程中由钣金件装配焊接形成的老鼠洞,在某种程度上影响了整车的安全性能以及空间结构。为解决老鼠洞尺寸检查步骤繁琐、检查效率低等问题,提出了一种基于拟合投影的车身老鼠洞检查方法。首先,通过创建老鼠洞边缘轮廓截面对轮廓曲线进行直线拟合并投影至截面;其次,建立投影轮廓范围内的等距空间网格划分机制,借鉴最小二乘法的“残差平方和最小”原理筛选网格节点;最后,运用最佳逼近定义提取老鼠洞中心轨迹点及最大内切圆半径。利用CATIA软件为开发平台并结合CAA框架结构,实现老鼠洞检查功能,实例分析表明,检查结果具有良好的准确性,功能运行高效、自适应性强,有效缩短了产品研发周期。The rat hole formed by the assembly and welding of sheet metal parts in the design and manufacturing process of automobile body affects the safety performance and spatial structure of the whole vehicle to some extent.In order to solve the problems of complex procedures and low efficiency for inspecting rat hole size,a method of rat hole inspection for vehicle body based on fitting projection was proposed.Firstly,the contour curve was fitted and projected to the section by creating the rat hole edge contour section.Secondly,the grid partition mechanism of equidistant space within the projection contour was established,and mesh nodes were selected by using the principle of“minimum sum of squares of residual errors”of the least square method.Finally,the best approximation definition was employed to extract the center track point and the maximum radius of the inner tangent circle.Using CATIA software as the development platform and combined with CAA framework structure,the rat hole inspection function was realized.The example analysis shows that the inspection result can attain high accuracy,efficient function strong self-adaptability,and effectively shortened cycle of product research and development.

关 键 词：老鼠洞 曲线拟合 投影 网格划分 中心轨迹点 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]