Energy recovery analysis and parameter optimization of linear motor energy regenerative suspension of construction vehicles

LYU Baozhan; LI Pengning; LYU Yaran; DENG Xiaoting

doi:10.16186/j.cnki.1673-9787.2022020042

Abstract：Objectives To recover the body vibration energy caused by road roughness during the driving pro-cess of construction vehicles,and to solve the incongruous problem of the dynamic performance and energy regenerative performance of the suspension,Methods an energy regenerative suspension structure with linear motor and shock absorber in parallel was proposed.Firstly,a two-degree-of-freedom dynamic model of energy regenerative suspension was established,and ceiling control was used to improve the smooth run-ning of the vehicle.Secondly,in order to solve the coordination problem of ride comfort and performance of energy-fed suspension,the genetic algorithm control strategy was adopted to optimize the performance of energy-fed suspension.The suspension shock absorber damping was taken as the optimization design vari-able,and the optimization objective function of energy-fed performance,ride comfort and safety of linear mo-tor energy-fed suspension was established to obtain the global optimal solution.Finally,the performance of energy-fed suspension was simulated by MATLAB/Simulink.Results The simulation results showed that the root-mean-square(RMS)values of body acceleration,tire dynamic load,and suspension dynamic travel of energy-fed suspension under ceiling control were reduced by 25.40%,17.76%and 32.58%,respectively,compared with passive suspension.The dynamic performance of energy regenerative suspension and energy regenerative performance were coordinated optimization by genetic algorithm.The dynamic performance of energy regenerative suspension after optimization deteriorated to some degree compared with that before op-timization,but was significantly improved compared with that of passive suspension.The average energy re-covery of battery was significantly increased by 15.22%.Conclusions The energy regenerative suspension device with parallel structure of linear motor and shock absorber can recover the vibration energy of suspen-sion system of engineering vehicles.The genetic algorithm coordinated control strategy adopted can coordi-nate the dynamic performance and energy regenerative performance of the energy regenerative suspension,and the energy regenerative performance was significantly improved.