中文摘要：

提出了一种分级匹配的超声检测模板定位方法。首先在待测工件与检测模板工件的包围盒中心分别建立坐标系来进行匹配，然后通过质心匹配使待测工件实际位姿基本与检测模板吻合，再通过完全匹配来实现检测工件的最终定位。通过仿真与实例分析了各级匹配的精度与效果，验证了此分级匹配定位算法的可行性，并给出超声C扫描实例。该算法应用在航空螺旋桨的无损检测上，大大提高了检测效率与可靠性。

英文摘要：

A multi-graduation match localization algorithm between the testing work-piece and template by software localization method was proposed. First the coordinate was established in surrounding box center of both the testing work-pieces and template one separately. Then the center of mass matching was used to cause actual pose of the testing work-piece to tally basically with the template. Next the final localization was completely realized through the entireness mass matching, which is the last level. All levels of match precision were analyzed through the simulation and the C scanning example was given to confirm this graduation match localization algorithm feasibility. This algorithm has been greatly applied in the ultrasonic testing of airscrew and improved the localization accuracy and ensured the efficiency and reliability of UT.