Accurate prediction of magnetorheological damper characteristics based on a new rheological constitutive model

Abstract

Physical modeling of magnetorheological dampers (MRDs) plays a crucial role in understanding the dynamic characteristics, optimizing design, and developing control algorithms of MRDs. The systematic study of various factors indicates that an accurate magnetorheological fluid (MRF) rheological model can effectively improve the estimation accuracy of the MRD physical model. The difficulty in establishing an accurate MRF model lies in the rheological behavior of MRFs at low and medium shear rates (0.01 ∼ 103 s−1) measured by commonly used rheometers exhibits notable differences from that at extremely high shear rates (105 ∼ 107 s−1) in MRDs. Therefore, this paper proposes to estimate the rheological behavior of MRFs at extremely high shear rates using the exponential linear mixed analytical (ELMA) model with excellent description and prediction capabilities, combined with the infinite viscosity and nonlinear term decay rate constraints determined based on rheology and related limited rheological data. This paper constructs a series of predictive MRD physical models combined with other relevant information, from the simple analytical model to the complex numerical model. The simulation results of the monotube MRD physical model, constructed based on the ELMA model identified by the above method and considering all deformation and inertial effects, are consistent with the corresponding dynamic test results of the MRD, reflecting the effectiveness and prospect of the parameter identification method and physical model.