Research On Hardware-in-the-loop Test Method For Magnetorheological Dampers

The Magneto-Rheological(MR)damper is a relatively typical vehicle semi-active suspension main component,which has the advantages of controllable damping force,fast response,low power consumption,so the semi-active suspension of the MR damper will gradually bring to market.When the actual MR damper is developed,the adjustment control algorithm and modification hardware spend time,and waste material during repeated verification control effect.In recent years,the 1/4 vehicle suspension bench test system is widely used in the process of vehicle load spectrum and MR semi-active suspension research,but the test focuses on the overall structure of the semi-active suspension and introduces multiple physical quantities such as the unsprung mass increases the variables of the test structure during the development process,and can not accurately describe the damping characteristics of the MR damper under different incentives,seriously affected the development process of MR damper.In response to these problems,this paper studies the method of shortening the development process of the MR damper.Taking the 1/4vehicle suspension as an example of modifying the control algorithm in different load conditions,the control method is Hardware-in-the-loop(HIL)test method,and writing a complete semi-active control program containing MR damper Sky-hook damping control algorithm model,designs and built the HIL platform of the sprung mass excitation,and simulates and experimental research on the MR damper semi-active suspension system.The main content includes several aspects.First,according to the working principle of the MR damper,analyzed the study of the MR damper.The results show that in order to make the vehicle have ideal damping characteristics,different damping coefficients are required,which providing theoretical basis for the simulation and experimental research of the following.In order to test both the random loading method that conforms to the actual vibration excitation,it is also avoided that a large amount of time is affected by the unsprung mass in the MR damper development test process.This paper studies the method of shortening the development process of the MR damper,and proposes a test method based on time domain road spectrum,the method excuses the sprung mass excitation to act as a vibration excitation,and take the 1/4 vehicle suspension model as an example,by Simulink Simulation analysis gets the acceleration time domain road spectrum of the spring mass,editing the waveform editing process,and performs an accurate signal reproductionof the road spectrum by testing the electro-hydraulic servo excitation stage.This paper uses the acceleration time domain in the spring mass as an experimental excitation to study the HIL test method of the control algorithm when studying different road conditions.To this end,by writing a complete semi-active control model including Sky-hook damping control algorithm of the MR damper,the complete semi-active control model is established,and designs and built the HIL platform control algorithm of the MR damper.This platform is mainly composed of premax electro-hydraulic servo,program-controlled source,programmatic calibrator,double beam electro-hydraulic loading bench,etc.Finally,based on this platform,simulated and experimental study on the MR damper semi-active suspension system.It can be seen that the semi-active suspension spring mass acceleration is less than 30% by the sinusoidal and road spectrum incentive test.The experimental results verify the combination of road spectrum test methods and direct spring mass incentives,which can effectively accelerate the MR semi-active suspension control;simple adjustment control algorithm,modify hardware,thus speeding up MR damper development process.