著者

大下 裕樹 藤田 悦則 榎 芳美 我田 茂樹 中川 紀壽

出版者

一般社団法人日本機械学会

雑誌

Dynamics and Design Conference : 機械力学・計測制御講演論文集 : D & D (ISSN:13480235)

巻号頁・発行日

vol.2002, 2002-09-13

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Several vibration-isolating equipments with metal spring, air spring, rubber spring and an oil damper are developed. The purpose of this paper is to study the vibration and noise of the engine that is reduced by new mount-system (duffing's mount) using magnet-spring. At this study, an experimental device with the engine was created in order to measure the vibration and sound pressure level of the engine. The vibration was measured with acceleration pick-up and the noise was measured with sound level meter. In this study the new mount-system using magnet-spring was compared with rubber mount. The new mount-system using magnet-spring can reduce the vibration and solid borne sound of the engine rotation.

著者

延廣 良香 向井 美紀 小倉 由美 藤田 悦則 村田 幸治 亀井 勉 辻 敏夫 金子 成彦 吉栖 正生

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference

巻号頁・発行日

vol.2011, pp._207-1_-_207-10_, 2011

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For the homeostatic control, there are Ultra Low Frequency (ULF) fluctuations on the backbone of the control. We think we can extrapolate state of human by capturing variation of ULF fluctuations. In this study, a method was conceived for capturing ULF fluctuations by performing the time series of the gradients analysis of the pulse wave taken from the surface of the back, which was defined as an aortic pulse wave (APW) with zero-cross detection method or peak detection method. APW was recorded during an experiment with an induced sleep test in the sitting position. The results indicated that we can find drowsiness, a predictive signal for falling asleep and an impending sleep by catching variability of 0.0017Hz, 0.0035Hz and 0.0053Hz of ULF fluctuations of APW obtained by the analytical method we had invented.