Purpose

In this work, we had an object to obtain optimum design method of the ultrasonic transducers with high efficiency and large output power. For this purpose, we opted for the ultrasonic radiator model with 10 elements and conducted a detailed study of one’s design method.

Methods

The electro-mechanical equivalent circuit for the longitudinal vibration of the HPU radiator is derived, the resonance frequency equations are obtained, and also the structure dimensions for the longitudinal vibration of the radiator are optimized. At first, the characteristics of the HPU radiator are studied using the numerical method. As a supplementary means to verify the numerical results, the vibration of the HPU radiator is also studied using FEM in this section. The resonance frequency and the vibrational displacement distribution are numerically simulated and experimentally measured.

Results

The displacement correspondent to emitting face is maximized: gain factors of Langevin transducer, booster, and horn are 1.75, 2.50, and 2.80, respectively; therefore, whole gain factor of our ultrasonic radiator is 12.25. From the analysis and measured results in this work, it can be seen that by selection the system with 10 elements and structural optimization, the radiation dimension and vibration amplitude of the radiator can be effectively improved.

Conclusion

The resonance frequency and the displacement field of the radiator are measured, which are in agreement with the theoretical and analysis results. The results validated that the longitudinal vibration excited by Langevin transducer can be effectively amplified by the booster.

中文翻译：

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具有十个元素的大功率超声辐射器的优化设计方法

目的

在这项工作中，我们的目的是获得高效，大输出功率的超声换能器的最佳设计方法。为此，我们选择了具有10个元素的超声辐射器模型，并对其设计方法进行了详细研究。

方法

推导了HPU散热器纵向振动的机电等效电路，得到了共振频率方程，并优化了散热器纵向振动的结构尺寸。首先，使用数值方法研究了HPU散热器的特性。作为验证数值结果的补充手段，本节还使用FEM研究了HPU散热器的振动。对共振频率和振动位移分布进行了数值模拟和实验测量。

结果

对应于发射面的位移被最大化：Langevin换能器，升压器和喇叭的增益因子分别为1.75、2.50和2.80。因此，我们的超声波辐射器的整体增益系数为12.25。从这项工作的分析和测量结果可以看出，通过选择具有10个元素的系统并进行结构优化，可以有效地改善散热器的辐射尺寸和振动幅度。

结论

测量了散热器的共振频率和位移场，与理论和分析结果相吻合。结果证明，增压器可以有效地放大朗格文换能器激发的纵向振动。