Experimental and Analytical Approach to Study on the Soundproofing and Ventilating Effects of Rectangular Cavity
Quang Nguyen Huy, Yuya Nishimura, Sohei Nishimura, Noriko Horibe, Tsuyoshi Nishimura ,Thu Lan Nguyen, Takashi Yano

The present paper aims to theoretically and experimentally investigate the soundproofing characteristic of rectangular cavity with input and output opening at various positions. By the reason that the rectangular cavity must have a large volume to attenuate low-frequency noise, many resonance of higher-order mode wave will be generated inside the unit. Therefore, to minimize these waves in order to have a great soundproofing effect, the determination of the shape and dimension, moreover, the placement of these input and output is very importance. Acoustic characteristic of the rectangular cavity with input and output opening at various positions has been presented by solving the wave equation considering the higher-order mode wave effects. To prove the theory, experiments were carried out and excellent agreement is obtained.

Keywords: Soundproofing, resonance frequency, casement windows, higher-order modes