A self-powered, self-sensing magnetorheological damper

Magnetorheological (MR) dampers are promising for semi-active vibration control of various dynamic systems. In the current MR damper system, separate power supply and dynamic sensor are required. This paper is aimed to propose and investigate a self-powered, self-sensing MR damper, which integrates energy harvesting, sensing and MR damping technologies into one device. This multifunctional integration will bring great benefits such as size and weight reduction, energy saving, lower cost, higher reliability, and less maintenance for the use of MR damper systems. It will advance the technology of various dynamic systems such as machine tools, robots, prosthetics, and suspension systems. In this paper, a prototype of self-powered, self-sensing MR damper was designed, fabricated, and tested. Theoretical analysis and experimental study on power generation were conducted. The velocity-sensing method was investigated. The MR damping forces were also studied experimentally. Finally, the interactions among three functions were discussed.