著者

高野 敦 松林 三和子 松田 淑男 高野 千尋 小畑 貴稔 森川 洋

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集A編 (ISSN:18848338)

巻号頁・発行日

vol.79, no.801, pp.682-690, 2013 (Released:2013-05-25)

参考文献数

22

被引用文献数

1 1

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A high strength bolt fastening system for satellite structures has been developed. This fastening system enables high frictional strength by adopting titanium bolts with high strength and low torque-coefficient, as well as shims with high friction coefficient. Low torque-coefficient of the titanium bolts is achieved by PTFE (Polytetrafluoroethylene) solid-film lubricant, which is coated on the bolts. High friction coefficient of the shim is achieved by surface roughening by etching. To verify the design of the fastening system, long-term preload test, torque-coefficient test and vibration loosening test (Junker's test) were conducted and successfully completed. In addition, the fastening system was applied to a development model of satellite structure and was verified by mechanical environmental tests (static load test, system vibration test and thermal vacuum test). The observation showed no evidence of slip or alignment deviation. Thus, a conventional reamer-bolted-fastening system can be replaced with the developed high strength bolt fastening system that saves manufacturing period of satellites and furthermore enables the satellites to be competitive in terms of cost, delivery and performance.

著者

山下 和彦 野本 洋平 梅沢 淳 高野 千尋 太田 裕治 井野 秀一 伊福部 達 小山 裕徳 川澄 正史

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.45, no.1, pp.121-128, 2007-03-10

被引用文献数

2

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The aim of this study was to evaluate the postural control ability using stabilogram-diffusion analysis (SDA). Any parameters of SDA were compared with several parameters of body sway derived from recordings of the center of pressure (COP) with the aid of a static force platform. The subjects were 38 elderly healthy volunteers. They quietly stood on a static force plat form with open and closing eyes. As the results, there was a significant correlation between the diffusion constant derived from the parameters of SDA and the parameters of COP with eyes open and closed. The correlation was found to be greater in the closing eye condition than that in the open eye condition. The correlations between diffusion coefficients and the range and mean of anterior-posterior velocity were greater than the correlations between the diffusion coefficients and the range and mean of the lateral velocity. Thus, the muscle of the tibialis anterior and the planter muscles was suggested.