Wideband Nonlinear Dynamic Vibration Absorber Using Combined Softening And Hardening Stiffness Mechanism

Alex, Madi Chung (2019) Wideband Nonlinear Dynamic Vibration Absorber Using Combined Softening And Hardening Stiffness Mechanism. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

Text (24 Pages) Wideband Nonlinear Dynamic Vibration Absorber Using Combined Softening And Hardening Stiffness Mechanism.pdf - Submitted Version Download (7MB)

Abstract

The goal of the present work is to assess the performances of a nonlinear dynamic vibration absorber (NDVA) with combined softening and hardening stiffness mechanism in reducing the vibrations of a beam structure which is fixed at its end. In particular, three mechanisms of DVA are considered which are linear stiffness, softening stiffness and hardening stiffness. The purpose is to clarify if the combined of both nonlinear stiffness shows improvements with respect to the linear dynamic vibration absorber (LDVA) and single NDVA device. The nonlinear stiffness mechanism in NDVA is produced by the interaction force between the magnets. The strength of the nonlinearity can be varied by adjusting the separation gap between the magnets. Quasi-static measurement is used to estimate the linear and nonlinear stiffness of the system through force-deflection graph. Then, experimental results from dynamic measurement are presented to characterize the NDVA when the parameters are varied such as the separation gap and input excitation. The DVA is then attached on a beam structure where it is base-excited using a shaker and the reduction bandwidth on the beam response is measured. From this research, it is found that the bandwidth of a NDVA using combined softening and hardening stiffness mechanism is wider than the bandwidth of the LDVA and individual NDVA

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