Design And Optimization Of Buffer Device Based On Magnetorheological Grease

There are many impact loads in modern engineering applications.For example:in automobiles,aerospace,ships,engineering machinery and equipment,they are easily damaged by vibration and impact loads.Among them,the automobile industry is the most affected by collision and impact damage.With the increasing number of automobile collision accidents year by year,automobile collision impacts have caused huge negative impacts,ranging from shortening the service life of automobile-related equipment and damaging the automobile,and causing casualties.In order to reduce the property loss and casualties caused by the impact of the impact,it is urgent to design a buffer device with excellent performance,in which the magnetorheological(MR)buffer device has the advantages of rapid response and adjustable damping force,etc.Application prospects.The thesis aims to develop and design a buffer control device for automobile anti-collision system by taking advantage of the controllable and adjustable characteristics of MR materials.Traditional MR buffer devices usually use MR fluid materials.This suspension liquid has the disadvantages of easy sedimentation and leakage of ferromagnetic particles.At the same time,the traditional MR buffer devices still have low magnetic field utilization in structural design and The limitation of single energy absorption method.In order to overcome the problems faced by the traditional MR fluid buffer device,the paper introduces a new material,MR grease,to solve the shortcomings of MR fluid easy to settle and leak.Secondly,the radial flow characteristics of the damping channel are used to increase the magnetic field Utilization,and finally designed a clever combination of spring and MR grease to provide damping force.Based on the above characteristics,this paper designs and optimizes the structure of the MR fat buffer device.The following is the main research content of this article:(1)The overall structure of the MR grease buffer device is designed.Study several different working modes of MR grease,analyze the differences and characteristics of these working modes,and select a working mode of MR grease based on the engineering application of MR grease buffer device.Based on this working mode,a reasonable structure configuration of MR fat buffer device is proposed.(2)Study the mechanical model of the MR lipid buffer device and use simulink to establish the simulation model of the device.Aiming at the configuration of the MR lipid buffer device,the relationship between each parameter of the structure size and the damping force is established,a simulation model is established in simulink,and the influence of several key parameters on the magnitude of the damping force is analyzed according to the mechanical model.Study the mechanical model of the MR lipid buffer device and use simulink to establish the simulation model of the device.Aiming at the configuration of the MR lipid buffer device,the relationship between each parameter of the structure size and the damping force is established,a simulation model is established in simulink,and the influence of several key parameters on the magnitude of the damping force is analyzed according to the mechanical model.(3)The optimization algorithm is used to optimize the parameters.The theoretical principle of the whale optimization algorithm(WOA)is expounded.On this basis,a classic test function is used to simulate the optimization effect of the optimization test to verify the performance and correctness of the WOA.Taking the improvement of the output force value and adjustable range of the MR grease buffer device as the optimization goal,the non-critical structural parameters of the MR grease buffer device are set,and the key structural size parameters are optimized by the whale algorithm to optimize the results It shows that the initial design goal is reached.(4)Simulation analysis of the buffer device was carried out.In order to verify whether the MR grease buffer device designed in this paper meets the requirements.Firstly,the relationship between the current and the intensity of the magnetic induction line is analyzed,and the electromagnetic field simulation analysis of the magnetic circuit design of the MR grease buffer device is carried out.Secondly,the static simulation of the main stress-carrying parts is carried out,and it is analyzed to meet the requirements of stiffness and strength.Then,the structural data obtained in Chapter 4 is brought into the Simulink model of the total damping force in Chapter 3 to make simulation diagrams of current,damping force,and key parameters.Finally,in order to verify the effectiveness of the cushioning device model,the car impact crash test under simulated conditions is simulated.The velocity displacement damping force diagrams under different conditions are obtained,and it is analyzed that the MR grease buffer device reaches the initial set maximum damping force target and the damping adjustable coefficient is 1.5,so the MR grease buffer device designed in this paper finally provides The damping force can achieve the desired effect,and the overall design of the MR grease buffer device is reasonable.