Effects of Temperature on Performance of Compressible Magnetorheological Fluid Dampers.

摘要

This study focuses on the effect of temperature on performance of compressible magnetorheological fluid dampers (CMRDs). A magnetorheological fluid is a temperature-dependent material where its compressibility and rheological properties change with temperature. Experimental studies are conducted to explore the temperature effects on the properties of the magnetorheological fluid as well as the CMRDs. The effects of temperature on magnetorheological fluid properties include the bulk modulus, yield stress, and viscosity. In addition, a comprehensive review is conducted on the seals used in liquid spring applications with a focus on high pressure and high temperature applications.;A device is developed and used to experimentally test the performance of high-temperature sealing packs, which are found to have negligible performance losses with temperature up to 93°C at 41.4MPa. Moreover, a theoretical model is developed to predict behavior of a CMRD with temperature-dependent properties. An experimental study is conducted using an annular flow CMRD with varying temperatures, motion frequencies, and magnetic fields. The experimental results are used to verify the theoretical model. The stiffness and energy dissipation of the CMRD are obtained from the experimental testing. The effects of temperature on performance characteristics of the CMRD are analyzed. It is found that both the stiffness and the energy dissipation decrease with an increase in temperature of magnetorheological fluid.