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ON NATURAL CHARACTERISTICS OF A RIGID MOTOR FLEXIBLE BASE DYNAMIC COUPLED SYSTEM

Chinese Journal of Mechanical Engineering 2004年第2期17卷 219-221页

作者： SunYuguo songkongjie CollegeofOpticandElectronicInformationEngineering UniversityofShanghaiforScienceandTechnologyShanghai200092China CollegeofMechanicalEnginering ShandongUniversityJinan250061China

In shipping and aircraft engineering, the vibrating motor or instrumentationis usually mounted on a non-rigid base. To apply isolation design effectively, it is necessary toinvestigate the nature vibration characteristics of the rigid motor, flexible base coupled system. Auniversal dynamic express for the coupled system is derived. A PC-based measurement solution ispresented. And the system's dynamic behavior is then investigated numerically and *** results show that a strong interaction will exist between the motor's rigid mode and theflexible base's mode when the motor's mounting frequency is close to the flexible base's firstnatural frequency. The first natural frequency of the coupled system is generally lower than themotor's rigid mode frequency. At high frequency, the flexible base's modes are the dominant modes ofthe coupled system.

关键词： Vibration isolation Flexible base Natural frequency

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RESEARCH ON ACTIVE VIBRATION CONTROL BASED ON COMBINED MODEL FOR COUPLED SYSTEMS

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Chinese Journal of Mechanical Engineering 2004年第4期17卷 524-527页

作者： NiuJunchuan ZhaoGuoqun songkongjie SchoolofMechanicalEngineering ShandongUniversityJinan250061China

A novel combined model of the vibration control for the coupled flexiblesystem and its general mathematic description are developed. In presented model, active and passivecontrols as well as force and moment controls are combined into a single unit to achieve theefficient vibration control of the flexible structures by multi-approaches. Considering thecomplexity of the energy transmission in the vibrating system, the transmission channels of thepower flow transmitted into the foundation are discussed, and the general forces and thecorresponding velocities are combined into a single function, respectively. Under the controlstrategy of the minimum power flow, the transmission characteristics of the power flow areinvestigated. From the presented numerical examples, it is obvious that the analytical model iseffective, and both force and moment controls are able to depress vibration energy substantially.

关键词： Power flow Coupled system Combined control

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