Kyoichi Watanabe
Mitsubishi
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Publication
Featured researches published by Kyoichi Watanabe.
Journal of the Acoustical Society of America | 1999
Kyoichi Watanabe; Kouichi Nemoto
A sound absorption structure which is mainly applied to an intake system of an automotive engine for suppressing noise level. The sound absorption structure comprises a base duct portion, and an extended duct portion in which a sound absorption material is installed, and a Helmholtz resonator. The extended duct portion is formed such that a representative diameter of the extended duct portion is greater than that of the base duct portion while connected to the base duct portion. The Helmholtz resonator is set to be resonant at a frequency corresponding to a frequency range of a resonance generated by the installation of the extended duct portion including the sound absorption material. The Helmholtz resonator is integrally formed with the extended duct portion. Therefore, the sound absorption structure ensures an excellent sound absorption ability in the whole frequency range.
Jsae Review | 1999
Kyoichi Watanabe; Yoshiaki Minemura; Kouichi Nemoto; Hiroshi Sugawara
This paper describes two kinds of newly developed polyester sound-absorbing materials. One mainly consists of modified cross-section polyester fabric, and the other consists of recycled polyester fabric. They provide noticeably higher sound-absorbing performance than traditional materials like shoddy or urethane foam. This is because the new materials have greater surface area than that of traditional materials at an identical weight. Another feature of the new materials is their excellent recyclability since they are made of polyster. Application of the new materials to the dash silencer and floor carpeting resulted in a significant improvement in sound insulation performance while achieving weight savings.
Archive | 2004
Kyoichi Watanabe; Kenji Hosaka; Kouichi Nemoto
Archive | 1997
Motohiro Orimo; Kyoichi Watanabe; Kouichi Nemoto; Hiroshi Sugawara; Shousuke Oku
Archive | 2003
Kyoichi Watanabe; Hideaki Horie; Hiroshi Sugawara; Takaaki Abe; Osamu Shimamura; Yuuji Tanjou; Takanori Itou
Archive | 2007
Kyoichi Watanabe; Kenji Hosaka; Kouichi Nemoto
Archive | 1994
Hiroshi Matsukawa; Kyoichi Watanabe; Hiroshi Sugawara
Archive | 2001
Jun Okada; Kyoichi Watanabe; Katsumi Morohoshi; Hiroaki Miura; Takeshi Yamauchi
Archive | 2003
Kenji Hosaka; Shin Nagayama; Kyoichi Watanabe; 賢司 保坂; 恭一 渡邉; 森 長山
Archive | 2008
Kenji Hamada; Hideaki Horie; Kenji Hosaka; Takuya Kinoshita; Hajime Sato; Ryoichi Senbokutani; Kyoichi Watanabe; 良一 仙北谷; 一也 佐藤; 賢司 保坂; 英明 堀江; 拓哉 木下; 恭一 渡邉; 謙二 濱田