| Project/Area Number |
04650222
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
機械力学・制御工学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
SUEOKA Atsuo Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (80038083)
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| Co-Investigator(Kenkyū-buntansha) |
KONDOU Takahiro Fukuoka Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80136522)
RYU Takahiro Kyushu University, Faculty of Engineering, Research Associate, 工学部, 助手 (60230877)
TAMURA Hideyuki Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (20037724)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Pattern Formation in Rolling Contact Systems / Vibration of Rotating Body / Stability / Cntact Vibration / System with Time Lag / Polygonal Deformation / Vibration Characteristics of Visco-Elastic Body / 時間遅れ糸 |
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| Research Abstract |
There exist many rotatory machine systems in which a rotor is rotating under the condition of a constant pressure between outer circumference of the rotor and the other system being in contact with the rotor. Accompanying the deformation of the structure elements of the system itself, the development of the growth process into a strong vibration is often generated in the machine so that the continuous operatin is not possible any more.
The authors investigated the instability vibration generated in a rolling contact systems such as smoother roll of the paper making machine and winder system of textile machine in which a pair of rolls are in contact with each other and are rotating, and they tried to analyze the phenomenon of the polygonal deformation of the viscoelastic surface covering the roll circumfernces and to clarify the occurrence mechanism. In the basic analysis, they regard these systems as contact problem between rolls with retardation due to the viscoelastic deformation of the rubber and the elastic yarn ball, and compute the unstable regions numerically by applying the Laplace transformation and the stability analysis, and show the essential feature with respect to the polygonal deformation of roll and elastic yarn ball. The authors also conducted an experiment to identify the parameters used in the analytical model. They found from the test results that deformation recovery characteristics of the roll-covering rubber are time-dependent. The theoretical results are compared with those observed in the actual machines and the experimental apparatus, and a good agreement between them is confirmed.
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