Research On Establishing New MRD Dynamic Model And Numerical Analysis

Magneto-rheological damper (MRD) has excellent energy dissipation characteristics, which is the most development potential structural vibration control devices. A simple and effective dynamic model is the prerequisite for the engineering application of MRD. Due to the highly nonlinearity and complexity for MRD, the models that have been proposed have various shortcomings. Therefore, establishing new MRD dynamic model and numerical analysis is important and positive. Based on the dynamics experimental data of MRD, the establishment of MRD dynamic model and numerical simulation are researched in this paper. Main work and research are as follows:(1) The research and application of magneto-rheological technology and MRD are reviewed. Magneto-rheological fluid and MRD are briefly described. The existing MRD dynamic models are systematically summarized.(2) According to RD-1097MRD dynamic experimental data, the parameter identification for several common dynamic models of MRD is completed by the nonlinear least squares method on MTALAB platform. Those verified and analysed models will provide the foundation for establishing new MRD dynamic model and numerical analysis.(3) For different situations, the nonlinear Bingham model, the new Bingham hysteretic model and the improved polynomial model are proposed in this paper. It is verified by experimental data that the nonlinear Bingham model is more accurate and effective than the Bingham modal to reflect on the relationships between MRD damping force and speed at low speed. The hysteretic characteristic between damping force and velocity is expressed accurately and effectively in the new Bingham hysteretic model. The relationships of MRD damping force and speed, damping force and displacement can be better described in the improved polynomial model, in which friction lag effect, highly non-linear effect and hysteretic characteristics are included.(4) The numerical analysis of the Bingham model and the new Bingham hysteretic model are researched based on ANSYS. The results show that Combin37element is the most suitable to simulate the Bingham model. The stiffness of spring unit in Combin37element and load excitation frequencies are related to the calculation time step of Bingham model. The efficiency of numerical calculation for the new Bingham hysteretic model is greatly improved, and the accuracy is verified by finite element analysis.