The monitoring of the magnetic field is the most significant process for academic or industrial applications. In this study, we design a self-powered magnetic-field sensor based on the magnetorheological elastomer (MRE) and triboelectric nanogenerator (TENG) that can be used for both time-varying and uniform magnetic field (UMF) sensing. This TENG-based magnetic-field sensor (TMFS) relies on contact electrification and electrostatic induction of TENG to generate an electrical signal in response to the magnetic-induced deformation of MRE without using an external power supply. Enabled by the unique sensing mechanism and excellent magnetic-induced deformation of MRE, the TMFS exhibits a fast response (20 ms) and good magnetic-field sensing performance. The TMFS with 60 wt%-MRE shows a maximum sensitivity of 16 mV mT⁻¹ of the magnetic field ranging from 40 to 100 mT experimentally, and the sensitivity and detection range of TMFS can be adjusted by several parameters of the device. Besides the contribution to the effective detection of UMF, this novel sensor provides a new idea for the magnetic-field measurements in self-powered mode.

A magnetorheological (MR) damper model is established and linearized based on theory analyses and real testing. Since the mathematical model of the suspension system is nonlinear and complicated, a model-free fuzzy control algorithm is employed to design a controller for achieving vibration isolation. As a pilot study, two MR dampers are used to replace the passive ones of the front half-car. A quarter-car fuzzy intelligent controller is employed to control the two MR independent suspension systems, respectively. The performance of the MR suspension system is evaluated by road testing. The test results indicate that the vibration of the vehicle body and unsprung mass are both reduced significantly.

With the aim of improving micro-vibration isolation, a hybrid magnetorheological elastomer-fluid (MRE-F) mount with variable stiffness and damping is presented. The proposed mechanism combines a magnetorheological elastomer stiffness unit with a magnetorheological fluid damping unit in a parallel connection. On the basis of a structural design and magnetic circuit analysis, the performance of this prototype was investigated experimentally using an MTS machine under multi-operating conditions. The field-controlled capacities, including resultant stiffness, equivalent damping, as well as the amplitude and frequency dependence were validated based on the experimental data. This work demonstrates the feasibility of applying this hybrid MRE-F mount to isolation systems with a small displacement.

We prepared an EPDM/MVQ blend based MRE with good thermostability and mechanical performance by using interface modification and polymer blending methods.