Multi-dimensional Vibration Reduction Analysis Of Construction Vehicle 2SPS+SR Seat Suspension

Construction vehicles often run and work on "non-road" and are subjected to severe vibrations from different directions,and which will seriously damage health of drivers,and will further affect efficiency and operational stability.In view of the fact that seat suspensions of most construction vehicle only achieve vertical vibration reduction,the parallel semi-active seat suspension is designed based on magnetorheological dampers,which meet the requirements of multi-dimensional vibration reduction.The specific work is as follows:(1)Based on the theory of the parallel structure,the 2SPS+SR parallel damping seat suspension,consisting of multiple kinematic pairs and multiple kinematic branches,is proposed.And the vibration damping suspension model is established in the UG software.And the single-open chain theory and simulation analysis are used to verify the motion states of vertical,pitching and rolling that the seat suspension can achieve.(2)A mathematical model about the 2SPS+SR seat suspension is established,which calculate and analyze the displacement,velocity and acceleration.And the damping suspension is simplified to obtain the suspension branch chain sketch.The spatial coordinate system is established on the sketch to analyze the positive solution,and the rationality of the kinematic analysis is proved through ADAMS.In order to achieve the better vibration reduction effect,it is necessary to select the optimal stiffness and damping coefficient of suspension damping spring by simulating from three aspects of displacement,acceleration and dynamic load.(3)On the basis of the sine wave superposition method,a simulation model about three-dimensional road is established.And the RMS value and the PSD curve are used to verify that the obtained three-dimensional road spectrum can simulate the actual road well.Based on the "road-vehicle-seat" vibration system,the dynamic models of the seven-degree-of-freedom vehicle and the 2SPS+SR parallel damping seat suspension are established respectively.(4)According to the above seat suspension,the simulation model of the passive seat suspension is builted.The simulation model of the magnetorheological damper based on Bouc-Wen is established.According to the control principle,the simulation model of semi-active seat suspension is builted in Matlab/simulink under PID and Fuzzy-PID control.Under E-,F-and G-roads,the time-domain and frequency-domain vibration response of the semi-active seat suspension and passive seat suspension under the above three roads and different control methods are researched.Finally,based on the above time-domain response analysis results,the driver’s comfort is analyzed and studied.The results show that the damping performance in the vertical,pitch and roll are improved obviously by the 2SPS+SR semi-active seat suspension.The research results in this paper can provide a method for the further analysis of the vibration damping performance of construction vehicles.