1990 Fiscal Year Final Research Report Summary
Continuous Control of Modes of Vibration
| Project/Area Number |
01460124
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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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 | University of Tokyo |
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Principal Investigator |
OHNO Shinichi Institute of Industrial Science, University of Tokyo, Professor, 生産技術研究所, 教授 (40013114)
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| Co-Investigator(Kenkyū-buntansha) |
KATAOKA Masumi Chiba Institute of Technology, Professor, 機械工学科, 教授 (90083948)
OHISHI Hisami Institute of Industrial Science, University of Tokyo, Research Assistant, 生産技術研究所, 助手 (90168857)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Vibration Control / Vibration of Continuous System / Mode of Vibration |
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| Research Abstract |
A method was devised to shift the position of a node of the structural vibration along a designated path on the structure by applying controlled multiple exciting forces.
This method is based on the following idea. Assume that we take three points 1, 2 and 3 on the structure, apply two exciting forces at point 1 and 2 and observe the vibration at point 3. If the vibration of point 3 caused by the force applied at point 1 and the vibration of the point 3 caused by forceapplied at point 2 are the same in amplitude and opposite in phase, the vibration at point 3 will be stopped as a result of superposition. Then, if we can shift the position of point 3 continually by controlling exciting forces, a node will move along a path on the structure. If we need to stop the vibration of a particular point on the structure, we can simply allocate point 3 there.
First, a theory was derived to stop the vibration of a designated point on the structure. Experiments were made to test the theory using a beam simply supported at both ends by two exciters. Then, a theory was derived to shift the position of a node by controlling amplitude ratio, frequency and phase of exciting forces. Experiments were made to test the theory under two control conditions.
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