| Project/Area Number |
10555047
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
設計工学・機械要素・トライボロジー
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
TANAKA Masato THE UNIVERSITY OF TOKYO, SCHOOL OF ENGINEERING, PROFESSOR, 大学院・工学系研究科, 教授 (10011131)
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| Co-Investigator(Kenkyū-buntansha) |
SUGIMOTO Jutarou THE UNIVERSITY OF TOKYO, SCHOOL OF ENGINEERING, RESEARCH ASSISTANT, 大学院・工学系研究科, 助手 (20114514)
FUKUSIMA Yoshiaki THE UNIVERSITY OF TOKYO, SCHOOL OF ENGINEERING, RESEARCH ASSISTANT, 大学院・工学系研究科, 助手 (20011075)
SUZUKI Kenji THE UNIVERSITY OF TOKYO, SCHOOL OF ENGINEERING, LECTURE, 大学院・工学系研究科, 講師 (50251351)
SAKAKIDA Hitoshi TOSHIBA CO LTD., TECHNICAL CENTER FOR POWER INDUSTRY SYSTEM, CHIEF RESEARCHER, 重電技術研究所, 主査(研究職)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1999: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1998: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | journal bearing / wear / profile measurement / 摩耗 / 非接触計測 / 光学応用計測 |
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| Research Abstract |
Wear dents are often found on the surfaces of journal bearings in use for long, and these concave shapes are made because journals, make direct metal-to-metal contact with bearing surfaces while hydrodynamic oil films remain too thin during start-up or shut-down operation. Once the wear dent is formed, the oil film changes its shape, and the minimum oil film thickness may decrease, endangering bearing into seizure. Furthermore the rotordynamic coefficients would change, causing a self-excited vibration of rotor supported in the bearings before rated speeds are reached. Consequently, wear dent profiles on the bearing surfaces must be measured precisely to estimate the degradation of the bearing performance. However there exists no suitable measuring system available on the sites where bearings are installed.
This research project aimed to develop a new handy measuring system for practical use that can easily and rapidly detect surface wear dents of journal bearings of large diameter with the resolution of some micrometer. A gap sensor of eddy-current type is used to detect the distance between the sensor and the bearing surface. The sensor is mounted on a rotating arm which, in turn, is fixed on a beam. The beam can move in a linear actuator. Thus the sensor can scan the bearing surface in the circumferential and also axial directions. The distance data collected are real-time processed on-line in a small-size computer, and wear dent profiles are calculated automatically by means of a computer program installed in the computer. The program was newly developed and coded. The results are presented graphically and numerically on a monitor screen. This system was used to measure various wear dents machined artificially on the surfaces of model journal bearings, and proved to function satisfactorily with precise measurements.
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