The head mass as front-end material is an essential component of Tonpilz transducers. The transmission mechanism of head mass under excitations of continuous wave and short pulse are investigated in order to maximize the transducer acoustic radiation power. In the case of continuous wave excitation, it was found that the role of the head mass is to change the effective vibration velocity, and the transmitting voltage response is proportional to the characteristic impedance of the head mass. In the case of short pulse excitation, the head mass acts as a medium layer, and the highest acoustic radiation power appears when the characteristic acoustic impedance of head mass matches that of water medium. Our results provide deeper insight on the Tonpilz transducer design mechanism, and useful selection rules for the front-end material under different types of excitation signals.

作为前端材料的头部质量是Tonpilz换能器的重要组成部分。为了使换能器的声辐射功率最大化，研究了在连续波和短脉冲激励下磁头质量的传输机理。在连续波激励的情况下，发现磁头质量的作用是改变有效振动速度，并且传输电压响应与磁头质量的特征阻抗成比例。在短脉冲激励的情况下，磁头质量充当介质层，并且当磁头质量的特征声阻抗与水介质的特征声阻抗匹配时，最高声辐射功率就会出现。我们的结果提供了对Tonpilz换能器设计机制的更深入的了解，