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Self-powered and sensing control system based on MR damper: presentation and application

A new self-powered and sensing semi-active control system based on magnetorheological (MR) damper is presented. The system includes four key parts: a rack and pinion mechanism, a linear permanent magnet DC generator, a current adjustment MR damper, and a control circuit. Numerical simulations for seismic protection of elevated bridges equipped with this system excited by two historical earthquakes are conducted. Linear quadratic regulator (LQR) is used for the design of ideal active control system. LQR-based clipped optimal control as well as skyhook control is used to command a MR damper in both the semi-active control with external power and self-powered semi-active control. It is shown that five strategies (ideal active control, two semi-active controls and two self-powered semi-active controls) have similar control performance in pier response as well as bearing response. It is noticed that only one accelerometer is needed to monitor the response of the deck to realize the self-powered skyhook control, which greatly simplifies the classical semiactive vibration control system based on MR damper.