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Sun Yuguo
College of Optic and Electronic
Information Engineering,
University of Shanghai for
Science and Technology,
Shanghai 200092, China
Song Kongjie
College of Mechanical Engineering,
Shandong University,
Jinan 250061, China |
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ON NaTural
Characteristics of
a Rigid Motor Flexible base
dynamic coupled system*
Abstract:
In shipping and aircraft engineering, the vibrating motor or instrumentation is usually mounted on a non-rigid base. To apply isolation design effectively, it is necessary to investigate the nature vibration characteristics of the rigid motor, flexible base coupled system. A universal dynamic express for the coupled system is derived. A PC-based measurement solution is presented. And the system’s dynamic behavior is then investigated numerically and experimentally. The results show that a strong interaction will exist between the motor’s rigid mode and the flexible base’s mode when the motor’s mounting frequency is close to the flexible base’s first natural frequency. The first natural frequency of the coupled system is generally lower than the motor’s rigid mode frequency. At high frequency, the flexible base’s modes are the dominant modes of the coupled system.
Key words: Vibration isolation Flexible base Natural frequency |