| The car suspension is responsible for connecting the body and the wheels.Its main function is to reduce the vibration and shock caused by the uneven driving environment.Its excellent performance determines the ride experience of the people in the car and the safety of the vehicle.The semi-active suspension based on magnetorheological damper can realize real-time control according to the road conditions and greatly improve the suspension’s damping performance.For this reason,the magnetorheological damper is used as a shock absorber in a semi-active suspension.Firstly,the selected magnetorheological damper is tested for mechanical characteristics,and its damping characteristic curve is obtained,and its nonlinearhysteresis characteristics are analyzed.The hyperbolic tangent model with simple structure and good fitting effect is used to conduct the dynamic characteristics Describe and use the experimental data to identify the parameters of the mechanical model,and obtain a mechanical model of the damper with a good fitting effect.Secondly,based on the white noise method,a random road input model is established as the road input of the semi-active suspension system.A 1/4 suspension system model is established,and the dynamic characteristics of the suspension are analyzed by changing the system parameters and the control current of the damper.Finally,for the semi-active suspension,the sky-hook control,PID control and its compound control methods are designed.Under random road surfaces,combined with particle swarm optimization algorithm,and simulation is carried out.The suspension damping effect is the most obvious.The results show that when the magnetorheological damper is used in the semi-active suspension,and the compound control method adopted,compared with the passive suspension,the acceleration of the vehicle body and the dynamic deflection of the suspension are greatly improved,thereby improving the ride comfort of the vehicle.Figure 55;Table 9;Reference 68... |
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