纵弯转换球面超声振动聚焦系统谐振特性研究

Resonance features of a new ultrasonic vibration focusing system based on longitudinal-flexural vibration conversion

对由纵向振动换能器与薄球壳组成的纵弯转换超声振动球面聚焦系统进行理论、实验研究,揭示系统的振动特性。研究表明,系统具有完全与不完全两种谐振模式。在不完全谐振模式下系统具有整体谐振及局部共振两种状态,在两种状态下系统均可实现谐振。基于研究结果,提出系统在不同谐振状态下的设计方法。对新型聚焦系统设计、应用具有重要实际意义。

Here,a new ultrasonic vibration focusing system composed of a longitudinal vibration transducer and a thin spherical shell was proposed based on the principle of longitudinal-flexural vibration conversion. The resonance property of the new system was analyzed by means of the plate-shell theory,FEM method and tests. It was shown that the new system has two resonance patterns named complete resonance and incomplete resonance; under the incomplete resonance pattern,the system has two states of whole resonance and local resonance. The system design method was proposed for different resonance states based on the study results,it was of importance for the design and application of the new focusing system.