Modeling and Simulation of Vibration Absorber for the Carbody Utilizing Magnetorheological Elastomers

Abstract

To reduce the vertical vibration of the urban rail vehicle body, according to the theory of dynamic vibration absorber (DVA) and the adjustable magneto-rheological elasticity, a semi-active magnetorheological vibration absorber which is installed in parallel at the bottom of carbody is designed. In order to ensure the stable performance of the magnetorheological vibration absorber, the magnetic circuit structure of the magnetorheological absorber is analysed. The control expression of the magnetic field strength of the magnetorheological elastomeric working area is emphasized by the multiple regression analysis method, and the excitation current on the magnetic field strength control algorithm is proposed. Aiming at the characteristics of urban rail vehicle working conditions which are changing frequently and the vibration characteristic of the vehicle body is complex, a magnetorheological vibration absorbers system with strong adaptability to wide-band vibration is established. The study analysed the influence of carbody vertical vibration characteristic made by magnetorheological absorbers system and verified the vibration reduction capability by sperling index. The results show that the design of the magnetorheological absorber has a compact structure and high security. The use of the remaining space under the vehicle is reasonable. The vibration band of the established magnetorheological vibration absorbers system is wide which is always in a state of resonance with the carbody and avoid the occurrence of failure effectively, so as to keep the running quality of the vehicle at the superior level at all times. The work provides a reference for the application of semi-active vibration absorber of track vehicle body with the magnetorheological elastomer.