2006 Fiscal Year Final Research Report Summary
Study on Vibration Suppression of Multi-Degree-of-Freedom System with Parametric Excitation
| Project/Area Number |
17560203
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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 | Kanazawa University |
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Principal Investigator |
IWATA Yoshio Natural Science and Technology, Professor, 自然科学研究科, 教授 (90115212)
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| Co-Investigator(Kenkyū-buntansha) |
KOMATSUZAKI Toshihiko Natural Science and Technology, Lecturer, 自然科学研究科, 講師 (80293372)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Parametric Excitation / Pendulum System / Dynamic Absorber / Multi-Degree-of-Freedom System / Vibration Suppression |
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| Research Abstract |
A purpose of this study is to develop a passive absorber which makes it possible to suppress vibration of multi-degree-of-freedom systems using pendulum type dynamic absorbers which is called a parametric excitation dynamic absorber or an autoparametric vibration absorber. Such a dynamic absorber generates vibration suppression near resonance frequency of the main system when a natural frequency of the dynamic absorber is adjusted to half of natural frequency of the main system. A pendulum of the dynamic absorber vibrates only around resonance frequency of the main system and does not vibrate except the resonance frequency. The adjusted dynamic absorber to 1st resonance, 2nd resonance, etc can suppress amplitude of the corresponding resonance and does not disturb the dynamic absorbers for other resonances because it vibrates around only resonance. A pendulum type dynamic absorber which includes a rotational spring and damper has been developed in order to expand a sphere of the applica
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tion. Pendulums vibrated by the gravity have restriction for a sphere of the application because of having limitation of vibrating direction and the pendulum size. Parametric resonance of the pendulum with a rotational spring and damper is investigated when a support point of the pendulum is vibratory, and it is shown that its pendulum can be used for the parametric excitation dynamic absorber.
Then 1st and 2nd resonances of three-degree-of-freedom main system have been experimentally controlled by the dynamic absorber. The dynamic absorber with natural frequency equal to half of the 1st natural frequency of the main system reduces a peak of 1st resonance of the main system and the dynamic absorber with the frequency equal to half of the 2nd natural frequency also reduces a peak of 2nd resonance in the experiment. The suppression effect and the pendulum behavior are discussed. It is concluded that each dynamic damper becomes active only near the corresponding resonance and the main system vibration becomes small. Therefore the proposed parametric excitation dynamic absorbers can suppress vibration of multi-degree-of-freedom system. Less
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