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Research Papers

Acoustic Radiation of a Cylindrical Piezoelectric Power Transformer

[+] Author and Article Information
He Zhang

College of Civil Engineering and Architecture,
Zhejiang University,
Hangzhou 310058, China
e-mail: zjuzhanghe@zju.edu.cn

Guiru Ye

e-mail: yegr@zju.edu.cn

Zhicheng Zhang

e-mail: cezhangzc@gmail.com
Department of Civil Engineering,
Zhejiang University,
Hangzhou 310058, China

1Corresponding author.

Manuscript received January 9, 2013; final manuscript received February 22, 2013; accepted manuscript posted March 7, 2013; published online August 21, 2013. Editor: Yonggang Huang.

J. Appl. Mech 80(6), 061019 (Aug 21, 2013) (5 pages) Paper No: JAM-13-1014; doi: 10.1115/1.4023979 History: Received January 09, 2013; Revised February 22, 2013; Accepted March 07, 2013

Theoretical analysis is performed for the sound radiation of a cylindrical power transformer composed of piezoelectric transducers with radial polarization. The transformer is driven in thickness-stretch mode, and an exact solution is obtained for the sound pressure and sound power level in the surrounding fluid. Representative examples are used to illustrate the sound field induced by the operation of the transformer. Numerical results indicate that the electrical impedance and the thickness ratio of actuator/sensor to metal core have considerable effects on sound radiation of the cylindrical power transformer.

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Figures

Grahic Jump Location
Fig. 1

Schematic illustration of a cylindrical power transformer. The radially polarized actuator and sensor are respectively subject to an input voltage Vin and an electrical impedance Z, with the metal wall grounded.

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Fig. 2

Variation of the nondimensional radiation resistance and reactance coefficients for the cylindrical transformer versus kfrso

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Fig. 3

Spectrum of surface velocity of the transformer. The thickness ratio of metal core layer to piezoelectric actuator/sensor takes hm/hp = 1, 2, and 3. The electrical impedance is Z = (1 + i)Z0. The blank circle dots denote the SSM results.

Grahic Jump Location
Fig. 4

Spectrum of sound pressure at the transformer surface. The thickness ratio of metal core layer to piezoelectric actuator/sensor takes hm/hp = 1, 2, and 3. The electrical impedance is Z = (1 + i)Z0. The blank circle dots denote the SSM results.

Grahic Jump Location
Fig. 5

Spectrum of sound power level at the transformer surface. The thickness ratio of metal core layer to piezoelectric actuator/sensor takes hm/hp = 1, 2, and 3. The electrical impedance is Z = (1 + i)Z0. The blank circle dots denote the SSM results.

Grahic Jump Location
Fig. 6

Effects of electrical impedance on the sound power level of the transformer (hm/hp = 1).

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