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.
出处
《传感技术学报》
EI
CAS
CSCD
北大核心
2006年第2期388-392,共5页
Chinese Journal of Sensors and Actuators
关键词
自由曲面
超声检测
曲面分割
路径规划
curved surface part
ultrasonic inspection
surface subdivision
path generation
