多阵元液体压力激波发生器设计与声场数值模拟

Design of Multi-Element Shock Wave Generator and Sound Field Numerical Simulation

设计了一种多阵元液体压力激波发生器 ,它由多个压电陶瓷换能器组成 ,每个换能器经激励产生脉冲超声波 ,通过球形几何聚焦后 ,在聚焦区域形成高能、瞬时压力激波。文中用阻抗分析仪和高频扫描激光测振系统对单元换能器进行了基本性能的测试 ,在此基础上 ,对单元换能器的声场、激波发生器的声场进行了数值模拟 ,其结果与声场实测数据基本吻合。该激波发生器具有聚焦效果好、能量可控及结构简单等优点 。

Pressure processing with the shock wave in liquid is a b rand-new green manufacturing technique which provides good perspectives in man y fields. A high-energy shock wave generator based on focus of the pulsed ultra sonic wave is the key equipment for the technique. This paper deals with a shock wave generator constituting of a certain number of transducers. In each transdu cer, piezoelectric ceramic piece under stimulation is used to produce the pulsed ultrasonic wave. All pulsed ultrasonic waves from the transducers are geometric ally focused, and the shock wave with high energy forms in the focal region. Th e properties of a transducer of the shock wave generator are tested with impedan ce analyzer and laser interferometry measurements. Then the acoustic fields of a transducer and the shock wave generator are numerically simulated with MATLAB, which is analogous to the experiment data. The generator has many advantages: go od focusing capability, controllable energy and simple structure, thus meeting t he needs of composite material drilling and metal surface hardening.