Experimental Design of Passive Dynamic Vibration Absorber to Attenuate Broadband Vibration

Chai, Chang Shung (2019) Experimental Design of Passive Dynamic Vibration Absorber to Attenuate Broadband Vibration. Final Year Project (Bachelor), Tunku Abdul Rahman University College.

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Abstract

Broadband vibration is usually attenuated and control by using an active dynamic vibration absorber (ADVA) or a semi-active vibration absorber (SAVA) because of the fact these vibration absorbers are adaptable to all kind of vibration at a large bandwidth. However, the use of a single passive dynamic vibration absorber (DVA) to attenuate broadband vibration has not been so well explored. Passive DVA is a mechanical device that attaches to the structure, it requires no external power or others monitoring system on the system, which is relatively simple and reliable compared to ADVA and SAVA. Hence, this paper aimed to use single passive DVA to attenuate broadband vibration. The parameters of the DVA and the location attachment of the DVA on the host structure that affect the broadband vibration control was investigated. In the study, a fixed end cantilever beam is used as a host structure and a passive DVA is fabricated. The interest frequency of this study is from 0 Hz to 300 Hz which includes the first four bending natural frequency of the cantilever beam. Throughout the experiment, it is found that the first four bending natural frequency of the cantilever beam is 6.838 Hz, 42.668 Hz, 125.791 Hz and 242.283 Hz. Later, the fabricated DVA was attached on the cantilever beam to determine the performance of the DVA. The result shows that the proper attachment of the DVA with a natural frequency of 43 Hz (