Abstract In multi-resonant Tonpilz longitudinal vibrating piezoelectric transducers with a clamped bolt of which both ends are screwed directly into their head mass and tail mass, the influence of a radial gap between clamped bolt and transducer’s component elements on the transducer’s wide-band characteristic was illustrated through detailed qualitative and simulation analysis. In order to verify the validity of analysis, samples of triple resonant Tonpilz longitudinal vibrating piezoelectric transducer was fabricated and measured in both cases that there exists a radial gap between clamped bolt and their elements and there never exists. The 1st intrinsic longitudinal mode created due to the radial gap between clamped bolt and transducer’s component elements is coupled with longitudinal modes of the transducer to affect several characteristics of transducer including wide-band. Therefore, it was recommended that design and fabrication should be taken not to be created preferably a radial gap between clamped bolt and transducer’s component elements in multi-resonant Tonpilz longitudinal resonant piezoelectric transducer.

中文翻译：

---

夹紧螺栓与换能器组成元件之间的径向间隙对多谐振 Tonpilz 纵向振动压电换能器宽带特性的影响

摘要 在两端直接拧入头部质量和尾部质量的夹紧螺栓的多谐振Tonpilz纵向振动压电换能器中，夹紧螺栓与换能器组成元件之间的径向间隙对换能器宽带特性的影响为通过详细的定性和模拟分析说明。为了验证分析的有效性，在夹紧螺栓与其元件之间存在径向间隙和从不存在两种情况下，制作并测量了三重谐振Tonpilz纵向振动压电换能器样品。由于夹紧螺栓和换能器组件元件之间的径向间隙而产生的第一固有纵模与换能器的纵模耦合，以影响换能器的几个特性，包括宽带。因此，建议设计和制造最好不要在多谐振 Tonpilz 纵向谐振压电换能器中的夹紧螺栓和换能器的组件元件之间产生径向间隙。