Analysis of friction force of magneto-rheological damper with a novel mathematical model

Guo Jie Li,Mu Chai,Xuedong Pang

doi:10.21595/vp.2018.20091

Guo Jie Li, Mu Chai + Show 1 more

Open Access

https://doi.org/10.21595/vp.2018.20091

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Abstract

There are many conflicting viewpoints for friction force of MR damper. Readers may be lost in facing these conflicting viewpoints. In this study, a novel model of friction force of MR damper is proposed. This model tries to reveal the essence and help readers have a better understanding of friction force of MR damper. The model indicates that the friction force only relates to the current applied to the piston coil. The friction force will increase along with current applied to the piston coil. Friction force tests for a MR damper featuring bypass holes in piston were made on a MTS852 system. The model was improved to be correct by the experiment. Friction forces by calculation with the model and by experiment are in good agreement. It is believed that sliding friction and MR phenomenon contribute to the friction force.

Highlights

Magneto-rheological (MR) damper is a smart damper which has many excellent properties such as continuously variable damping, fast response in milliseconds, high authority at a low piston velocity, long term stability, simple electronics, straightforward controls, and so on
When the piston moves in the cylinder of MR damper under no current, the MR fluid goes through the annular orifice and bypass holes
When a large current is applied to the piston coil, a strong magnetic field only emerges in the annular orifice, and MR fluid turns into semi-solid one and is hard to go through the annular orifice

Summary

Introduction

Magneto-rheological (MR) damper is a smart damper which has many excellent properties such as continuously variable damping, fast response in milliseconds, high authority at a low piston velocity, long term stability, simple electronics, straightforward controls, and so on. Detailed study on friction force will be necessary and mechanism of friction force generation must be explored. There are many conflicting viewpoints for friction force of MR damper [3,4,5,6,7]. A novel model was proposed to describe the friction force of MR damper. No model for friction force of a MR damper has been found before. Friction force tests of a MR damper under different excitation current were made on a MTS852 system. Results of tests indicate that the friction force increases along with current which is applied to piston coil. ANALYSIS OF FRICTION FORCE OF MAGNETO-RHEOLOGICAL DAMPER WITH A NOVEL MATHEMATICAL MODEL.

Friction model

MR damper

Results and discussions

Conclusions