Development Of MRF Damper Model And Investigation Of The Effectiveness Of Suspension Using MRF Dampers For Controlling Roll Dynamics Of Vehicles

The designing of the conventional passive suspension is a tradeoff between the two quantities of ride comfort and handling, so the suspension can not meet the complex and ever-changing incentives driving conditions, and vehicles can not meet the safety as well as ride comfort at the same time. Intelligent Suspension can be used to solve the contradiction of ride comfort and handling, so it is the future direction of the development in automotive manufacture. Semi-active suspension is an Intelligent suspension, with other types of suspension unparalleled advantage. In recent years, SUV (Sport-Utility-Vehicle) and MPV (Multi-Purpose Vehicle) are emerging at an unprecedented rate. The mass center of SUV compare to others car is higher, so the vehicles like of SUV roll stability are weak. Because the damping of MRF Damper can be controlled, adjusting the damping of MRF damper on both sides of vehicles, will reduce the difference between left and right pressure of wheels and ground, also reduce the side Inclination and increase comfort. This would enable vehicles traveling in a steady-state kinetics, enhancing vehicle roll stability, avoid vehicles rollover in extreme circumstances. In this paper, emerging the thought of using semi-active suspension system based on MRF technology enhances the roll stability of the vehicles from the future prospects of MRF technology and the trend of semi-active suspension for the automobile. On the basis of analysis of the existing magneto-rheological damper model and used the modeling-after-test method to establish an accurate MRF-damper model can be used for theoretical study of semi-active control because the damper is consecutive adjustable. In this paper presents a new control strategy - RSIA skyhook control strategy for enhancing vehicle roll stability and does not affect the normal vehicle ride comfortable. In the final chapter, the joint simulation between MATLAB/Simulink and CarSim approved the semi-active suspension system based on MRF can be effective in preventing rollover of vehicles.In foreign, using of semi-active suspension to enhance the vehicle roll stability has extensive research, but domestic start late in the field, nor in-depth study. This paper made corresponding analysis of the problem and application prospects of using semi-active suspension control vehicle roll stability. This paper is divided into six chapters to discuss semi-active suspension based on MRF technology to improve vehicle roll stability,The six chapters of this paper will discuss in the follow:Chapter I mainly introduced the constant of this paper. The conventional passive suspension can not meet the ride comfort and safety requirements at the same and synthesis of the good prospects of semi-active suspension based on a new MRF application to improve the vehicle roll stability. Discuss the situation semi-active roll control (SARC) in domestic and abroad, being forward the main content and propose of this paper at last.On the basis of MRF characteristics and advantages detailed, three working modes of MRF Damper introduced in Chapter II. A Delphi MRF damper under different currents was test using the MTS850 Damper Test Bench, according the People's Republic of China automobile industry standard QC/T 545-1999 - Automobile Shock Absorber Bench Test Method and combining a German company Damper Test standards. The test results are analyzed in this chapter.In Chapter III, we comprehensive analysis on the existing model and further study of how to achieve an accurate MRF damper model used in roll control. Using the result of MRF damper test of Chapter II and through the interpolation operation on test database, we set up a MRF Damper model in MATLAB/Simulink and ready for control theoretical study.Chapter IV discussed the purpose of the vehicle roll mathematical model and established a mathematical model. Roll control for the vehicle, should not affect vehicle ride comfort and safety when the vehicle did not roll. A preliminary study on ride comfort and safety of vehicle use the skyhook strategy control the four-degree-of-freedom roll plane model. Detailed of the simulation results and optimize the control parameter in this section.Run a simulation of the CarSim vehicle and the MATLAB/Simulink controller model in Chapter V. Basis on the optimization parameters of skyhook control strategy, this section establish a new control method - SIA skyhook control strategy. SIA skyhook control strategy can effectively reduce vehicle roll angle, enhance the Roll Stability and prevent rollover for high-quality cars like SUV.We sum up the work of this paper and prospect the future work in Chapter VI. The meaning of this study and the significance of the results have been achieved. Establishing some ideas about how work will go on in the future for this issue.In this paper, there are several aspects of the following characteristics:(1) Proposing an idea that uses semi-active suspension based on MRF technology for vehicle roll control, improve vehicle roll stability.(2) Establishing an accurate MRF damper model for theoretical study basis on the result of bench test.(3) Simulation is used establishing controller in MATLAB/Simulink to control vehicle model in CarSim, and the verification of the RSIA skyhook control strategy can control the MRF dampers which can enhance the roll stability of vehicles.