Title: Study on sound absorbing mechanism of MPP affected by bending resonance of panel

Authors: Yoshinobu Kamada; Tomoaki Kashiwao; Shuto Hoshino; Takafumi Shimada

Addresses: Department of Creative Engineering, National Institute of Technology, Kitakyushu College, 5-20-1, Shii, Kokura Minami Ward, Kitakyushu-city 802-0985, Japan ' Department of Creative Engineering, National Institute of Technology, Kitakyushu College, 5-20-1, Shii, Kokura Minami Ward, Kitakyushu-city 802-0985, Japan ' Department of Creative Engineering, National Institute of Technology, Kitakyushu College, 5-20-1, Shii, Kokura Minami Ward, Kitakyushu-city 802-0985, Japan ' Department of Creative Engineering, National Institute of Technology, Kitakyushu College, 5-20-1, Shii, Kokura Minami Ward, Kitakyushu-city 802-0985, Japan

Abstract: Followed by the study (Sakagami et al., 2010a) about the micro-perforated panel (MPP) with honeycomb structure, in this paper, the MPP for vehicle noise, vibration and harshness (NVH) performance development is studied, where the MPP prototype is moulded by a sophisticated 3D printer, and its sound absorption coefficients are measured by the experiment of acoustic impedance tube. Two proposals are made according to the interpretation of absorbing mechanism. One is the potentiality of thin MPP not combined but contacted with honeycomb core, which might cause higher sound absorption by the induced sound impact effect. The other is the potentiality of 3D-MPP that increases the design parameters by the mass and the depth of aperture as well as the diameter and the pitch among apertures.

Keywords: sound absorption; MPP; micro-perforated panel; bending resonance; honeycomb core; 3D printer; Helmholtz resonance; absorbing mechanism; panel bending.

DOI: 10.1504/IJVP.2017.086883

International Journal of Vehicle Performance, 2017 Vol.3 No.4, pp.302 - 320

Received: 04 Mar 2016
Accepted: 07 Sep 2016
Published online: 02 Oct 2017 *

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