ウェアラブル空圧システムのための音響で作動する制御弁に関する研究 : 第1報, 音響切換弁のパイロット弁の試作

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A sound operated directional control valve is proposed in order to widen the application of pneumatic drives to a multi-degree wearable system. The proposed valve opens and closes in response to the sound of a specific frequency propagated inside the gas supply tube and therefore needs no electric wiring to convey the control signal. By using multi-frequency sound, several valves can be controlled simultaneously and resultantly the pneumatic multi-degree wearable system can be constructed compactly. In this paper, firstly, the sound-gas pressure converter, which uses the resonance of a vibrating object consisting of a leaf spring and head, is proposed and is improved so that self-excited vibration does not arise. Secondly, the basic characteristic of the sound-gas pressure converter is investigated, and it is clarified that the back pressure is different depending on whether the sound of specific frequency exits or not. Furthermore, a pilot valve of the sound operated directional control valve is developed by combining the sound-gas pressure converter with a vibration transmitting element, which transmits the vibration in the tube to the sound-gas pressure converter. Using a Dry-Ice Power Cell developed in a previous study as the portable gas supply, the characteristic of the developed pilot valve is investigated experimentally. It is clarified that a definite change of back pressure of the pilot valve in response to the sound inside the gas supply tube can be obtained, and it is concluded that the developed valve can be used as a pilot valve of a sound operated directional control valve.
社団法人　日本フルードパワーシステム学会の論文
2008-05-15

ウェアラブル空圧システムのための音響で作動する制御弁に関する研究 : 第1報, 音響切換弁のパイロット弁の試作

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