著者

野田 英嗣 WIDYAPARAGA Adhika 小清水 孝夫 迫田 直也 河野 正道 高田 保之

出版者

一般社団法人日本機械学会

雑誌

動力・エネルギー技術の最前線講演論文集 : シンポジウム

巻号頁・発行日

vol.2012, no.17, pp.109-110, 2012-06-20

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Thermoacoustic refrigeration is a very attractive method of temperature control due to its environment friendliness. The thermoacoustic heat pumping occurs within a regenerator positioned in the thermoacoustic device. The acoustic field within the device consists of acoustic travelling waves propagating in positive and negative directions and as such, the regenerator temperature gradient will be influenced by both. To investigate the effect of these individual travelling waves, we constructed a thermoacoustic device consisting using two opposite facing speakers thus enabling manipulation of positive and negative direction travelling waves. By decomposing the measured acoustic field into its positive and negative propagating components and calculating the acoustic power using the two sensor method, the effect of the individual travelling waves on the direction of acoustic power and regenerator temperature gradient was observed.

著者

廣松 卓真 小清水 孝夫 WIDYAPARAGA Adhika 河野 正道 高田 保之

出版者

一般社団法人日本機械学会

雑誌

スターリングサイクルシンポジウム講演論文集 (ISSN:09189238)

巻号頁・発行日

vol.2014, no.17, pp.71-72, 2014-12-05

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We have constructed and tested a shell and tube heat exchanger with a dual speaker thermoacoustic device. We have tested a shell and tube heat exchanger by changing the phase between two speakers at both ends of the device. Five thermocouples are positioned within the regenerator and inlet and outlet water temperature were measured with two other thermocouples. Two pressure sensors are positioned each side of the device along the regenerator. We have measured the regenerator temperature and pressure at both sides of the regenerator with changing the mass flow rate of coolant water. The temperature distribution of regenerator and the acoustic power were gained from measured values.

著者

柳原 和夫 河野 正道

出版者

大同特殊鋼株式会社

雑誌

電気製鋼 (ISSN:00118389)

巻号頁・発行日

vol.63, no.2, pp.109-118, 1992-04-15 (Released:2009-05-25)

参考文献数

2

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The tribological conditions between tools and work pieces on cold/warm forging of steels are very severe because of high contacting pressure, high temperature, and large surface extension of work pieces. Therefore, many lubricants and estimating methods have been developed. But even using these methods, it's difficult to estimate that lubricants have a good effect on production or not.We have estimated many lubricants by ring compression and spike forging test to find new coating which is substitutes for conventional one such as Zn-phosphate and Na-stearate coating or oxalate and resin coating on cold/warm forging of steels.We selected some lubricants by spike forging test which gave large extension to work pieces and agreed with the result of backward extrusion qualitativly, and further evaluated the lubricants by heading test and mass production test of bolts by multi stage cold bolts former.As a result of tests, we found the new coating method which was over coated by Ca-stearate with MoS2 or Ca-hydroxide with PTFE on the inorganic salts precoating such as K2SO4 or Na2B4O7·5H2O.