Reduction of air-space and bandwidth extension of piezoelectric sound absorption panel

2016 Fiscal Year Final Research Report

• Project/Area Number: 26420187
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Dynamics/Control
• Research Institution: Kansai University
• Principal Investigator: Yamada Keisuke 関西大学, システム理工学部, 准教授 (80456798)
• Research Collaborator: TERAO Yasuki ; IMAI Yuki ; NISHIDA Hayato ; HIRAYAMA Keita ; TANAKA Satoshi ; OBA Takafumi ; KAWABATA Yusuke
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 吸音 / 低周波音 / 圧電素子 / スマート構造システム / 共鳴 / エネルギハーヴェスティング / モード解析

Outline of Final Research Achievements

We proposed a piezoelectric sound absorbing panel in the preceding research. The sound absorption coefficient was maximized at the targeted frequency; however, there remains a problem that the frequency range where the sound absorption coefficient is high is narrow. Therefore, two methods that broaden the frequency range were proposed in this research. One method uses an L-LRC circuit instead of the LR circuit to increase a natural frequency. The other method amplifies the excitation sound pressure that is added to the plate using a microphone and another piezoelectric element. This active method decreases the mechanical impedance of the plate. The frequency range is increased by about 50 % and 250 % by the former and latter methods, respectively. In addition, the modal analysis of the acoustic field that is subjected to the displacement excitation was also studied. Furthermore, the effectiveness of the energy harvesting using the piezoelectric sound absorbing panel has been studied.

Free Research Field

工学