Passive Vibration Isolation Using Magneto-Rheological Elastomers

초록

It is well-known that automotive vibration isolator such as engine mounts requires two performances; both the good vibration isolation in term of NVH and ride & handling in terms of stability. However, they are typically conflicting with the conventional passive or semi-active control action. In this research, these two conflicting issue will be resolved by using magneto-rheological elastomers (MREs). These functional materials are new class of smart materials that consist of polymeric matrix (such as synthetic rubber) with embedded mirco-sized with carbonyl iron particle. As a result of this composite microstructure, the viscoelastic properties (such as the dynamic stiffness) of MREs can be controlled by magnetic field. In this study, we presents the application of magneto-rheological elastomers (MREs) to automotive components. We will focus on rear cross member bushes, which is a key component for isolating the vibration from the road, and demonstrate their improved vibration isolation performance by using prototype MRE-based bush. The resonance frequency shift induced by the stiffness change of MRE will be presented through the measured frequency response functions