Abstract
Smart structures such as damping adjustable dampers made of magnetorheological (MR) fluid can be used to attenuate vibration transmission in vehicle seat suspension. The main research content of this paper is the nonlinearity and hysteresis characteristics of the MR damper. A hysteretic model considering both excitation characteristics and input current is proposed to fit the damper force-velocity curve for the MR damper under different conditions. Multifactor sensitivity analysis based on the neural network method is used to obtain importance parameters of the hyperbolic tangent model. In order to demonstrate the fitting precision of the different models, the shuffled frog-leaping algorithm (SFLA) is employed to identify the parameters of MR damper models. The research results indicate that the modified model can not only describe the nonlinear hysteretic behavior of the MR damper more accurately in fixed conditions, compared with the original model, but also meet the fitting precision under a wide range of magnitudes of control current and excitation conditions (frequency and amplitude). The method of parameter sensitivity analysis and identification can also be used to modify other nonlinear dynamic models.
Highlights
Vehicle ride comfort plays an important role in vehicle dynamics research, in which the transmission of vibration through seat exerts a crucial influence
E structure of the magnetorheological damper is similar to the structure of an ordinary vehicle cylinder damper. e medium inside the MR damper is a magnetorheological fluid. e MR fluid can reversibly change from free flowing, linear viscous liquids to non-Newtonian fluid with a controllable yield strength when exposed to a magnetic field [13]
E causes of nonlinearity are listed as follows: (1) different magnetoresistivity of electromagnetic circuits; (2) hydrodynamics of MR fluid flowing in piston gap; (3) the chemical properties of MR fluid; and (4) the relationship between the yield stress generated by MR fluid and applied magnetic field strength
Summary
Vehicle ride comfort plays an important role in vehicle dynamics research, in which the transmission of vibration through seat exerts a crucial influence. The damper force is calculated by the pressure difference between the two ends of the damper piston, structural parameters, MR fluid parameters, and magnetic field strength [17]. Ere are many types of parametric models, among which the Bingham model is the most basic one This model can describe the relationship between the damper force and displacement well, it cannot reflect the hysteresis relationship of force-velocity. The Bouc–Wen model is widely used, which can exactly describe the hysteretic characteristics of the MR damper force versus piston velocity by designing the hysteresis variable z.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
