Calibration Study of Continuously Controllable Output Characteristics of Magnetorheological Suspension.

To thoroughly examine the output characteristics of a semi-active vehicle suspension system featuring a magneto-rheological (MR) damper, a filtered white noise method and a first-order Padé approximation are used to model the random road excitation affecting the front and rear wheels. The rheological properties of the selected MR fluid are carefully analyzed, and a double-ended MR damper is developed based on these properties. This process involves the design, fabrication, and testing of the MR damper, followed by the development of a control model informed by the experimental results. A four-degree-of-freedom (4-DOF) dynamic model of the MR semi-active vehicle suspension, incorporating the double-ended MR damper, is established for both the front and rear wheels. Numerical simulations are performed to assess the impact of vehicle speed and MR damper excitation current on the suspension system's output response. The results show that variations in vehicle speed and MR damper excitation current significantly affect the suspension's output characteristics. Additionally, the suspension's output characteristics vary consistently with changes in vehicle speed and MR damper excitation current, indicating excellent controllability. [ABSTRACT FROM AUTHOR]