著者

根岸 秀世 雨川 洋章 間庭 和聡 小原 新吾 羽山 誠 董 大明

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 (ISSN:21879761)

巻号頁・発行日

vol.85, no.875, pp.19-00086, 2019 (Released:2019-07-25)

参考文献数

22

被引用文献数

3

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Grease lubrication in ball bearings is one of key technologies to reduce energy consumption and enhance lifetime in design of spacecrafts as well as general industrial machineries. From a view point of grease lubrication design, it is crucial to understand grease macro flow phenomena in ball bearings taking into account non-Newtonian property of grease. In the current study, grease macro flow phenomena were investigated based on experimental and numerical works as a preliminary study. Grease dam breaking was defined as a benchmark problem and its collapsing phenomena were experimentally observed. As for the numerical work, a basic algorithm to simulate non-Newtonian grease macro flows was developed based on the explicit MPS (Moving Particle Simulation) method coupled with Bingham pseudoplastic fluid model. The observed grease dam breaking behavior was simulated by the developed numerical approach and the numerical results showed a good agreement with the corresponding experimental data.

著者

福澤 健二 寺田 諭 式田 光宏 雨川 洋章 張 賀東 三矢 保永

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 C編 (ISSN:03875024)

巻号頁・発行日

vol.72, no.723, pp.3655-3664, 2006-11-25 (Released:2011-03-04)

参考文献数

11

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A novel micro-mechanical probe for friction force microscopy has been presented. The probe has a double cantilever that is supported by a torsion beam. It measures the lateral force by detecting the deflection of the double cantilever and measures the vertical force by the torsion of the torsion beam. It can measure the two forces independently without the mechanical crosstalk. The force resolution is of the order of 1 nN. The probe can clarify the micro/nanotribological phenomena more accurately than conventional cantilever probes and provide useful information for the identification of material properties.