On the Vibration Isolation of Flexible Structures

[+] Author and Article Information
Y. Q. Tu

Department of Civil Engineering, Beijing University of Aeronautics and Astronautics, Beijing, Chinayongqingtu@263.net

G. T. Zheng1

School of Aerospace Engineering, Tsinghua University, Beijing, Chinagtzhengtu@yahoo.co.uk


Author to whom correspondence should be addressed.

J. Appl. Mech 74(3), 415-420 (Mar 28, 2006) (6 pages) doi:10.1115/1.2201882 History: Received May 01, 2005; Revised March 28, 2006

Although the study of vibration isolation has a very long history, when an isolated structure is so flexible that it cannot be properly approximated with a rigid body or a single-degree-of-freedom model, its vibration isolation brings about some new questions and problems. By transforming the dynamic equation of motion of the coupled structure formed by the isolator and the isolated structure into the modal space and following the tradition of studying features of the vibration transmissibility across the isolator, questions and problems associated with the flexible structure vibration isolation are studied. It is found from the study that a lower isolation frequency and a higher damping level can both increase the isolation effectiveness, the isolated structure is a vibration absorber to the isolator, and a combination of the vibration isolation and the vibration attenuation can be more effective in mitigating the vibration. A numerical example of the whole spacecraft vibration isolation has proved the above conclusions.

Copyright © 2007 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

The finite element model of a satellite on the top of an isolator

Grahic Jump Location
Figure 2

Isolation frequency 10Hz (dotted line η=0, solid line η=0.02)

Grahic Jump Location
Figure 3

Isolation frequency 18Hz (dotted line η=0, solid line η=0.02)

Grahic Jump Location
Figure 4

Isolation frequency 50Hz (dotted line η=0, solid line η=0.02)

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Figure 5

Transmissibility of 50Hz isolation frequency (dotted line) and 18Hz isolation frequency (solid line) (η=0)




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