两端辐射双频超声换能器设计方法

Design Method of the Dual-end Whole Radiation Dual-frequency Ultrasonic Transducer

根据功率超声波的应用要求,提出一种两端辐射双频超声换能器。为了其具体应用,通过对两端辐射双频超声换能器振动特性分析,建立其机电等效电路图,并推导出共振频率方程组。设计两款辐射块形状不同的两端辐射双频超声换能器,根据两个设计工作频率,使用频率方程组计算出各部分尺寸。利用ANSYS软件对其中一款换能器模型进行模态分析和频响分析,验证频率方程组的准确性。研制出该款换能器样机,通过试验测量出样机的纵向共振频率。试验结果表明,换能器的实测共振频率与设计值误差小于5%。利用本设计方法,可以设计出满足两个工作频率要求的双频换能器,且换能器的实际工作频率与理论值更为接近,能满足实际应用要求。

According to the application requirements for power ultrasonic,a new type of dual-end whole radiation dual-frequency ultrasonic transducer is proposed.For its specific application,by means of the vibration characteristics analysis of the dual-end whole radiation dual-frequency ultrasonic transducer,the electro-mechanical equivalent circuit is established and the resonance frequency equation set of the transducer is deduced.Two kinds of dual-end whole radiation dual-frequency ultrasonic transducer are designed,which the radiation blocks are different,and based on two design operating frequencies,the sizes of the various parts are calculated by used the resonance frequency equation set.After using the software ANSYS to do the modal analysis and harmonic response analysis of one of the transducers,the accuracy of the frequency equation set is checked.The model machine is manufactured,and the longitudinal resonance frequency is measured by testing.The experimental results show that the error between the measured resonant frequencies and the design values is less than 5%.By using this design method,the dual-frequency transducer base on any two different frequencies on request can been designed,and the operating frequencies is more closer to the theoretical values,which can satisfy the practical application requirements.