斜楔块条件下超声换能器的声场仿真  

Simulation of ultrasonic fields radiated by transducer through a wedge

作　　者：董明[1,2] 马宏伟[1] 陈渊[3] 张旭辉[1] 曹现刚[1] 

机构地区：[1]西安科技大学机械工程学院,西安710054 [2]长安大学高速公路施工机械陕西省重点实验室,西安710054 [3]西安科技大学理学院,西安710054

出　　处：《振动与冲击》2017年第6期152-156,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51074121);中国博士后科学基金资助项目(2015M572653XB);陕西省教育厅专项科学研究计划项目(15JK1455);长安大学高速公路施工机械陕西省重点实验室开放基金资助项目(310825161124)

摘　　要：各种大型轴类零件形状复杂,体积和质量大,拆卸困难,主要用小角度纵波探头在轴端面实施探伤。小角度纵波超声检测方法在工业中有着大量的应用,对于小角度纵波探头的声场研究还较少。以空间脉冲响应为理论基础,根据界面条件下的波形转换以及超声波的透射规律,建立了小角度纵波超声探头在斜楔块条件下的空间声压模型,给出了其空间脉冲响应的计算公式,并仿真得到了不同斜楔块角度时介质中的声压分布图,利用半圆阶梯试块测试了声轴线的声压和指向性图,实验结果和仿真计算基本一致。该方法可用于不同参数的超声探头倾斜入射时的声场仿真,为制定轴类零件非拆卸情况下的检测策略,提高检测可靠性奠定基础。Owing to that a large shaft is very difficult to be disassembled because of its complicated shape, large volume and quality, the fatigue cracks of shaft components are mainly tested by using a small angle longitudinal ultrasonic wave probe arranged on the end face of the shaft.Small angle longitudinal transducers are widely used in industry and for their reliable application, it is essential to have thorough understanding about the characteristics of radiation beam patterns produced in the medium. Considering the mode conversion and refraction at the interface, a model was developed based on the theory of spatial impulse response, which can be used to calculate the ultrasonic field of the small angle longitudinal transducer under wedge conditions. The ultrasonic field distribution patterns at various wedge angles were obtained by simulation. The field distribution in a half-round stair (HS) block was measured as an example, and the measurement results are in good agreement with the simulation results. The method can be used to simulate the acoustic field of small angle longitudinal transducers with different parameters, which is helpful to make the strategy decision for shaft inspection and improve the reliability of ultrasonic testing. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

关 键 词：空间脉冲响应 斜模块 小角度纵波 超声检测 

分 类 号：TB551[理学—物理]