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Sensors 2017, 17(5), 1111; doi:10.3390/s17051111

Sound Power Estimation for Beam and Plate Structures Using Polyvinylidene Fluoride Films as Sensors

1
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China
2
School of Aircraft Engineering, Nanchang Hang Kong University, Nanchang 330063, China
3
Kuang-Chi Advanced Institute of Technology, Shenzhen 518000, China
*
Author to whom correspondence should be addressed.
Academic Editors: Xiaoning Jiang and Chao Zhang
Received: 13 April 2017 / Revised: 1 May 2017 / Accepted: 10 May 2017 / Published: 16 May 2017
(This article belongs to the Special Issue Acoustic Sensing and Ultrasonic Drug Delivery)

Abstract

The theory for calculation and/or measurement of sound power based on the classical velocity-based radiation mode (V-mode) approach is well established for planar structures. However, the current V-mode theory is limited in scope in that it can only be applied to conventional motion sensors (i.e., accelerometers). In this study, in order to estimate the sound power of vibrating beam and plate structure by using polyvinylidene fluoride (PVDF) films as sensors, a PVDF-based radiation mode (C-mode) approach concept is introduced to determine the sound power radiation from the output signals of PVDF films of the vibrating structure. The proposed method is a hybrid of vibration measurement and numerical calculation of C-modes. The proposed C-mode approach has the following advantages: (1) compared to conventional motion sensors, the PVDF films are lightweight, flexible, and low-cost; (2) there is no need for special measuring environments, since the proposed method does not require the measurement of sound fields; (3) In low frequency range (typically with dimensionless frequency kl < 4), the radiation efficiencies of the C-modes fall off very rapidly with increasing mode order, furthermore, the shapes of the C-modes remain almost unchanged, which means that the computation load can be significantly reduced due to the fact only the first few dominant C-modes are involved in the low frequency range. Numerical simulations and experimental investigations were carried out to verify the accuracy and efficiency of the proposed method. View Full-Text
Keywords: PVDF-based radiation mode; sound power; PVDF film; beam; plate PVDF-based radiation mode; sound power; PVDF film; beam; plate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Mao, Q.; Zhong, H. Sound Power Estimation for Beam and Plate Structures Using Polyvinylidene Fluoride Films as Sensors. Sensors 2017, 17, 1111.

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