Design and modeling of a double rod magnetorheological grease damper

Abstract

In order to improve the problem of poor sedimentation and easy leakage when applied to MR devices of magnetorheological (MR) fluid, this work made a magnetorheological grease (MRG) material with 70 % carbonyl iron powder and used Anton Paar rheometer to test its flow curve under different currents. The Bingham model is selected and the Origin software is used for fitting calculation. In addition, due to the advantages of rheological properties of MRG, the double rod MRG damper applied to the vibration reduction system was designed. The calculation of the main component parameters and the dimensions of the magnetic field Road size were conducted during the design process. After the physical completion of the MRG damper, its mechanical performance was tested, and the results showed that the maximum damping force reached 1.1 kN when the current was 1.8 A. Subsequently, the Bouc Wen model and Dahl model were introduced to describe the nonlinear behavior of the magnetorheological grease damper. The prediction accuracy of the two models was compared using a coefficient of determination, and it was found that the Bouc Wen model can more accurately and efficiently simulate the dynamic characteristics of the magnetorheological grease damper, with a coefficient of determination value above 0.99. Finally, the relationship between model parameters and current was established through least squares fitting, and most of the parameters were fitted with a cubic polynomial relationship with current.