Affiliations: [a] State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, China | [b] Xi’an Jiaotong University, Shaanxi, Xi’an, China
Abstract: Considering the particular demands for a large damping force in special vehicles, a new design for a parallel disc slotted magnetorheological damper is presented. In this damping generator, the direction of liquid flow between disc gaps is completely perpendicular to the magnetic flux direction, and the gaps can be cascaded to enhance the damping effect, thereby introducing a larger damping force based on the magnetorheological effect. In this paper, the damping characteristics of the new damper design are experimentally analysed first. Based on the experimental results, a dynamic model for the damper is constructed. The mathematical model is obtained by combining the Bingham model and the Herschel-Bulkley model, and accurately and clearly describes the characteristics of magnetorheological fluid. For parameter identification, two methods are utilized: a trial-and-error method and a recursive least squares method. Analysis shows that both methods have drawbacks. Lastly, a new method is proposed for combining the trial-and-error method with recursive least squares method. By comparing the theoretical curves obtained from the experimental curves and combined methodology, the results show that the combined methodology exhibits the highest accuracy as well as efficiency. The mathematical model established in this paper can accurately describe the characteristics of damping force. This model lays down the theoretical foundations for application and research on new parallel disk slotted magnetorheological dampers.
