Abstract:Magneto-rheological damper is an energy dissipation device,it convertes vibrational mechanical energy into its own thermal energy during using,the mechanical properties of the damper are affected by factors such as magnetic field and temperature.The temperature rise characteristics of the magneto-rheological damper was analyzed,the macro-micro dynamic model of magneto-rheological damper was established.The temperature field distribution of the damper was analyzed by finite element simulation,and the influence of the micro-structure of the magneto-rheological fluid on the shear yield stress was analyzed through theoretical calculations,as well as the influence of temperature and magnetic field on the magnetic susceptibility and viscosity of ferromagnetic particles in magneto-rheological fluid.According to experiment,when the coil has 0.5 A and 2 A current,and the temperature rises from 303 K to 343 K,the damping force drops by 14.5% and 10% respectively; when the temperature rises to 383 K,the damping force of the damper drops by 20.4% and 15.1% respectively.The results show that the temperature increases,the magnetic susceptibility of ferromagnetic particles and the viscosity of magneto-rheological fluid decrease; the magnetic field increases,the magnetic susceptibility of ferromagnetic particles and the viscosity of magnetorheological fluid increase.The experimental results are consistent with the theoretical calculation.The increase of the magnetic field compensates for the decrease of the viscosity of the magneto-rheological fluid caused by the increase of temperature,therefore,the influence of temperature on the damping performance of the magneto-rheological damper is weakened.