| Project/Area Number |
17360108
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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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 | KYUSHU UNIVERSITY |
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Principal Investigator |
KONDOU Takahiro Kyushu University, Faculty of Engineering, Professor, 大学院工学研究院, 教授 (80136522)
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| Co-Investigator(Kenkyū-buntansha) |
MATSUZAKI Kenichiro Kyushu University, Faculty of Engineering, Associate Professor, 大学院工学研究院, 助教授 (80264068)
SOWA Nobuyuki Kyushu University, Faculty of Engineering, Research Associate, 大学院工学研究院, 助手 (40304753)
BONKOBARA Yasuhiro Kyushu University, Faculty of Engineering, Research Associate, 大学院工学研究院, 助手 (10294886)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥8,900,000 (Direct Cost: ¥8,900,000)
Fiscal Year 2006: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 2005: ¥6,900,000 (Direct Cost: ¥6,900,000)
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| Keywords | Dynamics ＆ Control / Vibration control / Self-excited vibration / Pattern formation phenomena / Dynamic absorber / Optimum design / Contact rotating system / Time delay system / 安定解析 |
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| Research Abstract |
Previous studies have considered that the major occurrence mechanism of pattern formation phenomena is unstable vibrations generated in linear time delay systems. Many characteristics of these phenomena have been successfully explained using this mechanism.
In this study, the following investigations were performed to establish practical and easy-to-use methods for preventing the occurrence of pattern formation phenomena.
1. Development of a new stability analysis method and clarification of fundamental concepts
(1) A new stability analysis method based on the existence condition for boundaries between stable and unstable regions was developed for two-and three-degree-of-freedom systems.
(2) A structural design method that inhibits the occurrence of pattern formation phenomena was formulated by using this new stability analysis method.
2. Establishment of optimum design for dynamic absorbers for inhibiting the pattern formation phenomena.
(1) For single-degree-of-freedom systems, an optimum
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design method that does not require completely characterizing the system was formulated by assuming the worst conditions that maximize the instability intensity of the main system.
(2) For multi-degree-of-freedom systems, a method involving individually designing dynamic absorbers for each mode was proposed. This method effectively stabilized all the modes and greatly reduced the design time.
3. Experimental verification
An experimental system was produced to verify the effectiveness of the proposed stability analysis method. This was a multistage roll system that models the viscoelastic roll used in paper-making machines, etc. Experiments with single-degree-of-freedom systems were mainly carried out. The results indicate that unstable vibrations occur in the same range as that of the results obtained using the new stability analysis method, verifying the effectiveness of this method. Based on the results obtained in this study, verification of the effectiveness of the prevention method using dynamic absorbers will be performed in the future. Less
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