Tonpilz Piezoelectric Transducer with a Bending Piezoelectric Disk on The Radiation Surface

Yamamoto, Masahito; Shiba, Hisashi; Fujii, Takayoshi; Hama, Yoshinori; Hoshino, Takamichi; Inoue, Takeshi

doi:10.1143/jjap.42.3221

Cited by 16 publications

(7 citation statements)

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“…동 대역폭에 포함시켰으며, [11,12] Chhith 는 전면추에 빈공간을 두고 질량을 낮추어 Tonpilz의 품질계수 (quality factor)를 감소시켜 대역폭을 증가시키는 방 법을 제안하였다. …”

Section: 서 론unclassified

Design and Fabrication of Multi-mode Wideband Tonpilz Transducers

Kim¹,

Kim²,

Roh³

2013

The Journal of the Acoustical Society of Korea

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ABSTRACT:In this paper, we designed a wideband Tonpilz transducer, and verified the validity of the design through experiments. The wide frequency bandwidth was achieved by coupling the fundamental longitudinal mode of the transducer with a flapping mode of the head mass. Structure of the Tonpilz transducer was optimized by means of the finite element method and genetic algorithm to achieve the widest fractional bandwidth under design constraints. The optimized structure showed a far wider -6 dB fractional bandwidth of transmitting responses than that of single mode transducers. For verification of the design result, we manufactured a transducer prototype of the designed structure and characterized its performance, which showed good agreement with the design results.

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Section: 서 론unclassified

Design and Fabrication of Multi-mode Wideband Tonpilz Transducers

Kim¹,

Kim²,

Roh³

2013

The Journal of the Acoustical Society of Korea

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“…7, which functions as a multiple-mode filter because the transformer operates effectively, can obtain a bandwidth that is more than three times that of an individual transducer. [6][7][8]…”

Section: Analysis Modelmentioning

confidence: 99%

Finite-Element Method Analysis of Low-Frequency Wideband Array Composed of Disk Bender Transducers with Differential Connections

Yamamoto

Inoue

Shiba

et al. 2009

Jpn. J. Appl. Phys.

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In recent ocean investigations using underwater sonar transducers, low-frequency and wideband long-range sonar systems have been demanded for strong acoustic radiation and improved detective resolution capability in shallow-sea regions. We developed a disk bender transducer with a dual radiation surface as a miniaturized, light weight, low-frequency, and high-power transducer. However, there were problems in that the fractional bandwidth was small because the radiation surface was far smaller than the radiated wavelength, and the acoustic load per unit radiation area was small. Therefore, we suggest a technique to enable a wideband sonar array using differential connections of multiple disk bender transducers with different resonance frequencies to solve these problems. In this paper, we report results that endorse the above-mentioned technique obtained by finite-element method (FEM) analysis. The results confirm that this technique produces a wideband transducer array with low-frequency and high-power characteristics. We found that a wideband characteristic of more than 100% could be achieved with as a 6 dB fractional bandwidth by differential connection of disk bender transducers with three different resonance frequencies. In addition, we found that a superior horizontally oriented directivity was provided by locating the transducers in a plane symmetrical to the horizontal plane.

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“…The various applications and experimental conditions imply that these devices may operate under many environmental conditions: high temperature or pressure, external electrical direct current bias field, residual or mechanical pre-stress. For example, Tonpilz piezoelectric transducers are widely used for high-power (up to 100-200 MPa/V) underwater transducers with frequency from 40 kHz to 100 MHz [2][3][4][5][6][7][8]. Indeed, they are designed in a such a way as to maintain the piezoelectric stacks under high compression leading to an increasing efficiency and life time.…”

Section: Introductionmentioning

confidence: 99%