Focusing and Simulation Method of Curved Workpiece with Flexible Line Array
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摘要: 铸锻焊变曲率工件在相控阵检测时，传统相控阵探头难以紧密贴合，需要制备多种型廓楔块来保证耦合质量，检测方法复杂、低效且成本较高。采用柔性相控阵检测技术可以较好解决上述问题，但还需要解决柔性相控阵聚焦法则和微小缺陷的检测能力评价等关键技术。首先，根据相控阵声学原理，提出柔性相控阵换能器的延迟聚焦法则；然后，采用有限元方法建立声场传播模型，验证延迟聚焦法则的正确性；最后，对带有预埋缺陷的曲面工件进行仿真试验。结果表明，柔性相控阵技术能够对曲面工件内部微小缺陷进行高效率、高精度无损检测。Abstract: For the curvature workpieces in the casting forging and welding fields, the traditional phased array probe cannot get good coupling and it requires preparing various contour wedges to ensure the coupling quality, thus it is time consuming and high cost. These problems seem to be solved by using the flexible phased array technique, but how to determine the focal law of the flexible phased array transducer is also a hard task. In this paper, based on the phased array acoustic principle, the time delay focal law of flexible phased array transducer is addressed. Then the sound field propagation model is established using the finite element method to verify the accuracy of this provided delay focus law. Finally, the detection simulation of curved workpiece with embedded defect is carried out. The experiment results illustrate that the flexible phased array technology can obtain high efficiency and high precision nondestructive testing of tiny defects in the curved workpiece
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Keywords:
- curved workpiece /
- flexible phased array /
- focal law
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