Abstract
As semi-active hydraulic device, magnetorheological (MR) damper’s damping characteristics will be influenced by temperature. In addition, the MR damper with gas accumulator usually shows asymmetric loop characteristics. To capture the hysteretic characteristics of MR dampers accurately, a developed model considering the temperature effects and asymmetric characteristics is proposed and analyzed. A typical mono-tube MR damper with gas accumulator is designed and tested under different sinusoidal excitations, currents and temperatures for obtaining the temperature-dependent and asymmetric damping characteristics. Based on experimental results, the proposed asymmetric model and conventional symmetric model are compared. The accurately asymmetric model is identified to calculated coefficients about current and temperature. The MR systems with symmetric model considering temperature effects, asymmetric model independent with temperature and asymmetric model considering temperature effects are simulated and compared under H∞ control strategy. Results show that the proposed model is the best in accuracy and can be used for semi-active control system.
Highlights
Magnetorheological (MR) fluid is a suspension of micrometer-scale magnetic particles in non-magnetic carrier fluid
The outstanding properties of MR fluid such as fast response, reversible characteristics, and controllability depending on magnetic field have prompted a large number of studies and applications
MR fluid dampers have been applied in some highend vehicle suspensions, seat suspensions, bridges, and buildings because of the controllability and lower energy requirements (Choi et al, 2016)
Summary
Magnetorheological (MR) fluid is a suspension of micrometer-scale magnetic particles in non-magnetic carrier fluid. The dynamic models are established to describe symmetric hysteresis loops. An algebraic model which can describe the temperature effects and asymmetric characteristics is proposed and analyzed.
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