Influence of a radial gap between clamped bolt and transducer's component elements on the wide-band characteristic of multi-resonant Tonpilz longitudinal vibrating piezoelectric transducers

摘要

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. (C) 2020 Elsevier Ltd. All rights reserved.