超声波在换能器接触界面传播的特性研究

在研究超声换能系统的过程中发现,系统存在非线性特性.引起超声波非线性的主要因素是换能器子结构接触界面上传递的不连续造成的.该文对超声波在超声键合换能器中的传播为研究对象,建立了超声波在单一均质材料和两种材料接触界面传递的一维数学模型,并采用机械动力学软件进行了仿真,推导出界面预紧力和超声波传播的关系,并试验测试了超声换能器在不同预紧力条件下,换能器换能杆末端振动速度和键合强度的变化规律.为超声键合换能器系统的设计、安装和维护提供了可靠依据.

Study of Ultrasonic Propagation Characters at Contact Interface in Ultrasonic Transducer

During the research of ultrasonic bonding transducer system, it was found that bonding transducer system was nonlinear. The reason of nonlinear was due to the discontinuity of ultrasonic propagation at contact interface. The 1-D numerical model of ultrasonic propagation in a material and two materials was established. It was simulated using mechanic dynamic software. The relation of pre-tightening force and ultrasonic wave propagation was derived. The variation rule of the velocity of transducer end and bonding strength at different pre-tightening force was tested and measured, which provided proof for the design, assemble and maintenance of ultrasonic transducer.