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학술지 Improvement of Low-Frequency Characteristics of Piezoelectric Speakers Based on Acoustic Diaphragms
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저자
김혜진, 양우석, 노광수
발행일
201209
출처
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, v.59 no.9, pp.2027-2035
ISSN
0885-3010
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TUFFC.2012.2423
협약과제
11MB2100, 스마트and그린 빌딩용 자가충전 지능형 센서노드 플랫폼 핵심기술 개발, 김종대
초록
The vibrational characteristics of 3 types of the acoustic diaphragms are investigated to enhance the output acoustic performance of the piezoelectric ceramic speaker in a low-frequency range. In other to achieve both a higher output sound pressure level and wider frequency range of the piezoelectric speaker, we have proposed a rubber/resin bi-layer acoustic diaphragm. The theoretical square-root dependence of the fundamental resonant frequency on the thickness and Young-s modulus of the acoustic diaphragm was verified by finite-element analysis simulation and laser scanning vibrometer measurement. The simulated resonant frequencies for each diaphragm correspond well to the measured results. From the simulated and measured resonant frequency results, it is found that the fundamental resonant frequency of the piezoelectric ceramic speaker can be designed by adjusting the thickness ratio of the rubber/resin bi-layer acoustic diaphragm. Compared with a commercial piezoelectric speaker, the fabricated piezoelectric ceramic speaker with the rubber/resin bi-layer diaphragm has at least 10 dB higher sound pressures in the low-frequency range of less than 1 kHz. © 2012 IEEE.
KSP 제안 키워드
Analysis and simulation, Frequency characteristics, Fundamental resonant frequency, Laser scanning vibrometer, Piezoelectric speaker, Resonant frequency(Fr), Sound pressure level, Square root, Thickness ratio, acoustic performance, bi-layer