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Frequency-Dependent Viscoelastic Structural Elements for Passive Broad-Band Vibration Control

William Semke

Department of Mechanical Engineering, School of Engineering and Mines, University of North Dakota, Grand Forks, ND 58202-8359, USA

The effective control of vibration is essential in many systems, including remote sensing applications where high resolution is needed to observe features on Earth from a space platforn. It is advantageous to have a passive system that has the ability to effectively reduce the response of a structure due to base excitation over a large frequency range that may be changing. In this manner, not only is the system self-contained and reliable, but also it does not use limited resoirces available in a space environment that an active system requires. A vibration amplitude limiting system has been developed that uses both vibration isolation and absorber components. With the appropriate stiffness and damping parameters chosen, the device can limit oscillation amplitudes to an acceptable level over a broad prescribed frequency range. By using viscoelastic structural elements, both spring and damping properties are introduced in a single element, which also demonstate favorable frequency-dependent response. A translation amplitude limiting vibration system has been designed, analyzed, built, and tested. Both the theoretical and the experimental transmissibility as a function of frequency are determind. A summary of these results will be presented along with a comparison to a more conventional vibration isolation/absorber system using non-frequency-dependent elements.

Key Words: Vibration absorber • viscolesatic materials • passive control • experimental

Journal of Vibration and Control, Vol. 10, No. 6, 881-895 (2004)
DOI: 10.1177/1077546304041150


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