Using stepped-thickness variations, this work aims at amplifying the strength of the focused acoustic field generated inside a hollow piezoelectric cylindrical tube transducer without increasing the driving power. This requires a full understanding of the vibration and acoustic radiation characteristics of various configurations of piezoelectric tube transducers with internal and external axial stepped-thickness variations. A uniform-thickness cylindrical shell is machined at specific regions to acquire a stepped-thickness cylindrical shell with thin-walled regions. The design procedure includes determining the location and number of these thin regions. ANSYS software is used to determine the frequencies and mode shapes of various configurations of these shells. However, stress concentration, as an important design consideration, is also scrutinized at the step regions to avoid exceeding the material fatigue limit. An optimum design configuration for the stepped-thickness transducer is identified. Stronger acoustic fields are obtained using geometrical variations without any increase in the driving power. The simulations are validated experimentally with reasonable agreement.

利用阶梯式厚度变化，这项工作旨在在不增加驱动功率的情况下放大在空心压电圆柱管换能器内部产生的聚焦声场的强度。这需要全面了解具有内部和外部轴向台阶厚度变化的压电管换能器的各种配置的振动和声辐射特性。在特定区域加工厚度均匀的圆柱壳，以获得具有薄壁区域的阶梯厚度的圆柱壳。设计过程包括确定这些薄区域的位置和数量。ANSYS软件用于确定这些外壳的各种配置的频率和模式形状。但是，应力集中是重要的设计考虑因素，为了避免超过材料疲劳极限，还应在台阶区域处仔细检查应力。确定了步进厚度传感器的最佳设计配置。使用几何变化可以获得更强的声场，而不会增加驱动功率。通过合理的协议对仿真进行了实验验证。