Testing and parametric modeling of magnetorheological valve with meandering flow path

Abstract

The experimental testing and a new hysteresis modeling approach of a magnetorheological (MR) valve with meandering flow path formed by combination of multiple annular and radial gaps are presented. The dynamic behavior of the valve is evaluated using a dynamic test machine in displacement control mode based on the relationship between the valve pressure drop, the fluid flow rate and the magnitude of input current to the electromagnetic coil. In order to model the hysteresis behavior of the MR valve, a new parametric modeling approach is proposed based on the LuGre friction operator with some modifications to reduce the number of parameters involved. The parameters for each testing data are then identified using gradient descent method, and the parameter distribution is then approximated with polynomial functions. According to the performance assessment results, it can be concluded that the LuGre-based parametric hysteresis model is able to follow the hysteresis behavior of the MR valve within a particular range of excitation frequencies.