Characterization Of A Wideband Nonlinear Vibration Absorber Using Curved Constrained Cantilever Beam

Abdul Ghapar, Muhammad Faez (2017) Characterization Of A Wideband Nonlinear Vibration Absorber Using Curved Constrained Cantilever Beam. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In many industrial structure or appliances and also other structure such as a building, are involved in having an unwanted vibration such as from earthquake and hard storm. This unwanted vibration will cause a severity to the structure when the structure is excited to its natural frequency. In order to counter with the problem a device called vibration absorber is introduced. The vibration absorber is installed on the structure will suppress the unwanted vibration that occur. There is two type of absorber which is the linear absorber and the nonlinear absorber. The nonlinear absorber study is conducted and from the previous study it proves that the nonlinear absorber have a better performances than the linear absorber which is having wider safe operating frequency range. The study conducted is the characterization of a wideband nonlinear dynamic vibration absorber using curved constrained cantilever beam. The hardening method is used in order to have a nonlinear behaviour of the vibration absorber. The hardening method is by the application of profile curved block with quadratic profile of x3, x4, and x6 on the designed vibration absorber. The designed absorber consist of a cantilever beam that is lies between two curved block and having a mass at the free end of the beam. From the theoretical and analytical study, the curve will constrain the deflection of the absorber beam thus hardened the absorber beam stiffness and make the absorber behave nonlinearly. However in the characterization conducted the profile block curved used on the designed vibration absorber is not stiffen up the deflection of the absorber beam thus the absorber behave linearly. The modification of the nonlinear absorber is taken place by attaching a stopper on the curved block profile to assist in constraining the deflection of the absorber beam. There will only the suppression of the first mode of vibration on the primary structure will be conducted which is modelled by a beam. The first mode of vibration of the primary structure beam is determined to find its natural frequency. The designed nonlinear absorber is tuned to have the same natural frequency with the primary structure in order to suppress the vibration at its first mode of vibration thus the characterization of the absorber done. From the study conducted, it is proved that the designed nonlinear absorber by using the curved block with some modification is able to suppress the vibration on the first mode of vibration of the primary structure and providing a wider operating frequency range on the primary structure.

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