Search

A new self-sensing bearing based on magneto-rheological elastomers (MREs) was proposed in this paper. For the application in vibration isolation system, the effects of force input and semi-active controlled electric current (force and magnetic fields) on the self-sensing characteristics of bearing were simultaneously investigated. The modified anisotropic MRE with multi-walled carbon nanotubes (MWNTs) was studied to improve its electrical properties, and the MWNTs can reduce the initial resistivity from 325.06 to 1. 7 3 k Ω ⋅ m. To understand the sensing behaviors of bearing, the experimental system was built. The results confirmed that the self-sensing characteristic presents an obvious monotonous declining trend with the vibration force increases, and the mechanical properties of MRB can be regulated in real-time when they are subjected to varying currents (0–1 A). This finding is significant because it suggests that the bearings based on the modified MREs are potentially capable of being used for vibration absorbers and sensors simultaneously. Based on these results, it is expected to simplify the system structure and improve the response performance of vibration isolation. [ABSTRACT FROM AUTHOR]

The complexity of a semi-active vibration isolation system results in the difficulty of realizing its role on impact load effectively. Thus, a new self-sensing bearing based on modified anisotropic magnetorheological elastomer (MRE) is proposed in this study. This self-sensing bearing was fabricated by dispersed multi-walled carbon nanotubes and carbonyl iron particles into polydimethylsiloxane matrix under a magnetic field. The working conditions of the bearing were analyzed and decoupled. An optimal structure size of the bearing was selected and used for setting up the experiment test system. The self-sensing characteristic of the MRE bearing under the multi-field coupling of load and magnetic fields was then investigated by this test system. Results showed that the resistance of the modified MRE, in which a preload was applied by the bearing, could change approximately 28%–56% under extrusion force, mechanical force, and external magnetic field. The vibration isolation performance was tested based on the self-sensing characteristic. The bearing had excellent mechanical properties, which could reduce at least 30% of vibration. Thus, the modified MRE of the magnetorheological elastomer bearing could be simultaneously used as an actuator and a sensor. [ABSTRACT FROM AUTHOR]