Suspension Design And Protection Performance Simulation Of Two-stage Magnetorheological Anti-mine Seat

As the mobile carrier of soldiers and materials on the modern land battlefield,armored vehicles are important technical equipment to ensure the military logistics transportation task.Its performance is of great significance for the military to complete the daily training and combat tasks.Compared with ordinary vehicles,armored vehicles are not only subjected to random vibration from non-paved road,but also threatened by explosion shock wave from mines or improvised explosive devices.However,the passive seat suspension designed for resisting explosion shock wave and the semi-active seat suspension designed for specific working conditions are difficult to effectively meet the different requirements of armored vehicles for ride comfort and blast resistance.In view of this,this paper proposes a two-stage magnetorheological anti-mine seat suspension for armored vehicles,which can effectively meet the requirements of anti-mine and ride comfort.The overall design idea is as follows: the seat suspension system is divided into two stages:damping and buffering.In the damping stage,magnetorheological damper with damping control strategy is set to reduce the vibration load transmitted from uneven road to human body and improve ride comfort;magnetorheological damper with soft-landing control strategy is set in the buffer stage to buffer the vertical impact load on human body and reduce the risk of injury.In this paper,the anti-mine performance of the seat with the above suspension system is analyzed,and the design parameters optimization and performance evaluation of the suspension controller are carried out.The main work includes:(1)Determination of anti-mine seat performance requirements and input excitation.According to the evaluation standards of occupant comfort and human damage,the performance requirements and evaluation standards of the two-stage seat suspension are determined,and the anti-mine seat time-domain excitation model for characterizing vibration and shock conditions is established.(2)The establishment and verification of the simulation model of "Vehicle-Seat-Human".Based on the three-axle armored vehicle model,a two-stage anti-mine seat suspension system dynamic model was established,and its working principle and vibration characteristics were discussed and analyzed.The Hysteretic mechanical model of magnetorheological damper was established.Compared with the test results,the applicability under vibration and shock conditions is verified,on this basis,the mathematical expression of the inverse model of the damper is derived,which realizes the effective control of the current by the controller.The validity of the four-degree-of-freedom lumped-parameter human body model is verified under vibration and shock conditions.(3)Control strategy design and parameter optimization of seat damping suspension.Based on the semi-active damping control theory of the suspension,the performance of the Sky Hook and Ground Hook control strategy applied to the anti-mine seat suspension are discussed.Considering the ride comfort and the maximum compression stroke of the damping-level suspension,the hybrid Sky Hook-Ground Hook semi-active control strategy is determined as the control strategy of the seat damping-level suspension,and its related parameters are optimized.(4)Control strategy design and performance evaluation of seat buffer suspension.On the basis of completing the design of the seat damping level suspension controller,the soft-landing control strategy is used as the buffer level suspension control strategy,and the fuzzy adaptive PID control is used to track the expected output damping force and the actual output damping force error,and then using numerical methods,the buffering performance of the two-stage magnetorheological anti-mine seat suspension and the passive seat suspension are compared and analyzed.The effectiveness and advancement of the two-stage magnetorheological anti-mine seat proposed in this paper are verified.