曲面工件超声检测路径规划方法研究  

Study on Path Generation Method of Curved Surface Part for Ultrasonic Inspection

作　　者：吴思源[1] 周晓军[1] 杨辰龙[1] 江健[1] 

机构地区：[1]浙江大学机械与能源工程学院,杭州310027

出　　处：《传感技术学报》2006年第2期388-392,共5页Chinese Journal of Sensors and Actuators

摘　　要：在曲面工件型面跟踪式超声检测中,为了使超声波的入射方向和工件外表面法线方向较好地保持一致,扫描机构需实时地调整探头的位置和姿态,从而导致扫描速度难以提高,检测效率低下。针对此问题,提出了一种曲面工件自动分块检测的路径规划方法。基于曲面工件的CAD数据模型,该方法采用B样条节点插入算法和二叉树递归分割算法将曲面自动分割成一系列子曲面片,使每块子曲面片在给定的精度范围内逼近于平面片,然后对每块曲面片以平面扫描方式进行扫描路径规划。应用表明,该方法能保证超声波的入射方向较准确地垂直于工件外表面,在满足检测精度的前提下较明显地提高了曲面工件的检测效率。In the profile tracking ultrasonic inspection of curved surface part, scan manipulator needs to realtime adjust the prob＆s position and posture to keep ultrasonic incidence direction aiming at surface＇s normal direction. This leads to scan speed hard to increase and the inspection efficiency is low. To solve this problem, a new surfaee auto-subdividing inspeetion path generation algorithm is proposed. Based on the CAD model of the curved surface part, this method first divides the part＇s surface into a series of surface patches using B-spline knots inserting algorithm and binary tree recursive subdividing algorithm, making each surface patch approximating planar surface with giving precision, then generates scan paths of eaeh surface in the style of planar part inspection. It is shown that this method can nicely guarantee ultrasonic incidence direction perpendicular to the part＇s surface, increase inspection efficiency while meeting precision demand.

关 键 词：自由曲面 超声检测 曲面分割 路径规划 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TP273[自动化与计算机技术—计算机科学与技术]