基于声束追踪的变厚度曲面工件超声探头位姿规划
DOI: 10.6041/j.issn.1000-1298.2012.09.042
Keywords: 变厚度,曲面工件,超声检测,多元高斯声束叠加,探头位姿,声束追踪
Abstract:
针对传统变厚度曲面工件穿透法自动超声检测时各检测点声压变化大、信噪比低等问题，将多元高斯声束叠加声场建模方法引入曲面工件超声检测系统，建立接收声场数学模型，分析了检测参数对接收声压的影响，仿真与试验表明接收声压对探头姿态十分敏感，常规方法中探头位姿与声束路径间存在的小角度不可忽略，提出了基于声束追踪的探头位姿规划方法。针对双三次B样条曲面工件，先以常规方法确定发射探头位姿，然后从发射探头开始，追踪系统中声束，确定接收探头位姿。实际应用表明，与常规方法相比，基于声束追踪的探头位姿接收到的信号强、信噪比高，检测更精确。
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