Vibration control of thin plate structure with attached dynamic vibration absorbers

Mohamed Salleh, Mohammad (2016) Vibration control of thin plate structure with attached dynamic vibration absorbers. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

Vibration of a thin plate structure is one of a major concern in most engineering branches since it is the most widely used structural component in industrial applications, such as mechanical, electronic and civil structures. Thin plate structure exposed to vibration can lead to excessive deflections and eventually failure of the structure. The aim of this research is to investigate the effectiveness of using multiple dynamic vibration absorber for vibration control of a fixed-fixed thin plate. The vibration characteristics of thin plate are determined in the initial stage by using free vibration analysis. Two approaches are employed in the study: finite element analysis and experimental modal analysis. The preliminary results of finite element analysis demonstrate that the first five natural frequency of plate are 43Hz, 162Hz, 281Hz, 387Hz and 519Hz. These results are found corroborated well with the experiment, although there is a slight discrepancy in the first mode due to noise generated from inconsistent tapping during the impact hammer test. As it is planned to investigate the effectiveness of vibration absorber, a force vibration analysis of plate is carried out by using finite element method running in parallel with the experimental. Again, the simulation results of force vibration analysis are well validated with the experiment. Result shows that the average percentage reduction of plate attached with single vibration absorber is 84%. While when plate attached with dual dynamic vibration absorber, it provide a larger surpression of vibration amplitude which is about 94% at all frequency modes. From these results, it can be concluded that multiple vibration absorber can reduce the overall global structural vibration compared to a single absorber attachment. Nevertheless, the research reveals that the vibration absorber which designed in this study is significant in reducing the vibration. Both result free and force vibration responses of simulation were found corroborated with the experimental.

Item Type:Thesis (Masters)
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA349-359 Mechanics of engineering. Applied mechanics
ID Code:8989
Deposited By:Mr. Mohammad Shaifulrip Ithnin
Deposited On:22 Mar 2017 15:17
Last Modified:22 Mar 2017 15:17

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