| With the rapid development of e-commerce,the logistics industry has ushered in a new period of vigorous development.Especially in the process of goods transportation,uneven road surfaces can cause vibrations in heavy-duty trucks,which can lead to physical harm such as disc herniation and spinal pain for drivers and passengers.Therefore,improving the damping performance of the cabin suspension system is an effective way to improve the comfort and stability of the cabin.However,most heavyduty trucks currently use a passive full-floating suspension system,which is simple in structure and low in cost but cannot be adjusted in real time according to road conditions.Using magnetorheological dampers as the actuator for a semi-active suspension system has the advantages of low energy consumption,fast response speed,and continuously adjustable damping force,and therefore has a relatively wide range of potential applications.In this paper,a new type of labyrinth-type dual-channel valve magnetorheological damper(referred to as LDCV-MRD)is designed,which has the characteristics of large damping force and wide adjustable range,meeting the requirements of drivers and passengers for ride comfort and safety.The main content of the work is as follows:1.A new type of Labyrinth-type dual-channel magnetorheological damper(LDCVMRD)is designed,which uses a double-channel labyrinth valve structure to replace the traditional piston head.The main components of the damper are analyzed in terms of structural dimensions,mechanical verification,and material selection.Based on magnetic circuit design,the magnetic resistance and saturation magnetic potential of the damper operating area are calculated to verify the rationality of the design.A corresponding damping force mathematical model is established based on the Bingham plastic model to assist in the design and optimization of the magnetic circuit.2.The EMAG module in ANSYS finite element analysis software is used to establish a 1/2 plane simulation model of the magnetorheological damper,and to perform simulation analysis on its magnetic circuit to obtain a magnetic field distribution map.By changing the direction of the input current of the dual-coil,the effect of parameters such as effective current,number of coil turns,axial damping gap,and radial damping gap on the magnetic induction change of the damping channel is studied.The results show that the magnetic induction strength of the damping channel increases with the increase of current and number of coil turns,and decreases with the increase of axial damping gap and radial damping gap.3.Based on the establishment of a mechanical mathematical model of the output damping force and adjustable coefficient,MATLAB analysis software is used to perform mechanical simulation on LDCV-MRD.The numerical study investigates the effects of parameters such as current direction,effective current,number of coil turns,axial damping gap,and radial damping gap on the damping force performance of the damper.The results show that when the current in the input coil is in the opposite direction,the effective current is 2A,the number of coil turns is 510,the axial damping gap is 1mm,and the radial damping gap is 1mm,the output damping force is about 20642 N,and the adjustable coefficient is about 6.2.Satisfy the requirements of damping characteristics of dampers for heavy-duty trucks.4.Experimental research on the damper is carried out using an electro-hydraulic servo damping suspension test bench.The damping performance of the damper is tested by changing the amplitude,frequency,and current of the sinusoidal displacement excitation,and whether it meets the target requirements is verified.The results show that the damping performance of LDCV-MRD is good.When the current is 2A,the output damping force is about 21008 N,and the adjustable coefficient is about 5.61,which is consistent with the simulation results. |
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