1992 Fiscal Year Final Research Report Summary
Fundamental Study on Squeal
| Project/Area Number |
03650210
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
NAKAI Mikio Kyoto University Lecturer, 工学部, 講師 (50026043)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Squeal / Frictional Vibration / Brake / Self-Excited Vibration / Coefficients of Friction / Ceramics / Nonlinear Vibration |
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| Research Abstract |
The generating mechanisms of many kinds of squeals in dry friction were studied. The following results were obtained.
(1) When a contact rod clamped at one end is pressed in the radial direction on a thick rotating disc, the coefficient of friction grows great as the result of the tip of the rod worn and the frictional noise changes to the squealing noise.
(2) Dry friction of ceramics in high temperature causes the increase of the coefficient of friction. Squeal occurs when the coefficient of friction becomes more than the value of 0.6.
(3) Squeal frequency of band brake used for bicycles or washing machines increases with higher rotational speed of the drum and converges to the natural frequency of the coupled system between the band and the drum. Self-excited frequencies calculated by considering the contact stiffness and the frictional force between the band and the drum agree with the squeal frequency.
(4) When a disc is rubbed under the periodic excitation, squeals with a single nodal diameter mode or two modes occur. Under the random excitation, squeals with multiple modes occur.
(5) Nonlinear analysis of self-excited vibration induced by friction of a disc and a beam was conducted. We found the differences between calculated results from linear and nonlinear analyses.
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