1998 Fiscal Year Final Research Report Summary
Liquid dynamic absorbers for rolling of cable suspended carriers
| Project/Area Number |
09650268
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MATSUHISA Hiroshi Kyoto Univ.Precision Engin.Prof., 工学研究科, 教授 (00109034)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIHARA Osamu Kyoto Univ.Information Science, Asociate Prof., 情報学研究科, 助教授 (00218182)
HONDA Yoshihisa Kyoto Univ.Precision Engin.Instrutor, 工学研究科, 助手 (60181559)
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| Project Period (FY) |
1997 – 1998
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| Keywords | Dynamic Absorber / Vibration / Liquid Dynamic Absorber / Gondola / Ship / Cable Suspended Bridge / Rotation / Vibration Control |
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| Research Abstract |
Since Matsuhisa has proved that the wind-induced swing of ropeway carriers could be reduced by dynamic absorbers in 1993, many absorbers have been installed in ropeway carriers. In the actual use of dynamic absorbers composed of a steel moving mass on a arc-shaped track, the tunings of natural frequency and damping coefficient are not easy. Liquid-type dynamic vibration absorbers have advantages of an easiness of tuning of the natural frequency and damping coefficient.
In this study, dynamic absorbers composed of liquid (water or viscous liquid) in V-shaped or U-shaped pipes were investigated. The natural frequency can be easily adjusted by the amount of water. The damping coefficient can be adjusted by a diameter of nozzles at the terminals of pipe, an orifice or a net in liquid and the viscosity of liquid. The reduction of rolling of gondola lifts, ships and cable suspended bridge by the liquid dynamic absorbers were investigated theoretically. The formula to predict the effectiveness of the absorber was derived. The relationship between the effectiveness and the location and shape of the absorber was founded. The experimental investigations on the swing of pendulum, ship and cable suspended bridge were carried out by means of small models and it was found that the absorbers could reduce the rolling very well and it would be possible to install to the real gondolas, ships and cable suspended bridge.
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