Research On Vibration Reduction Of Seat Suspension Of Ride-on Mower Based On MR Damper

With the development of urbanization,the green area is expanding,and the labor intensity of ride-on mowing is increasing.With the increasing demand for riding mowers,the requirements for driving safety and driving comfort of riding mowers are also increasing.The working environment of the mount mower is generally complex and severe.When the worker drives the mount mower for work,the vibration and noise are only isolated by the simple vibration of the rigid body and the spring under the seat,which makes the worker feel discomfort and fatigue.At present,the research on the seat suspension of engineering vehicles still stays on the passive seat suspension with combination of spring and damper,and the research on the semi-active seat suspension which can further improve the driver’s comfort is less,especially for the semi-active seat suspension of the mount mower.Aiming at the problem of poor comfort and safety caused by the vibration of the riding mower under the bad working conditions,based on the simplified model and state equation of the semi-active vehicle dynamics,the LQR controller semi-active seat suspension system is designed,and the optimal controller weight coefficient matrix under different speed working conditions is obtained through the simulated annealing algorithm optimization.According to different speed conditions,the matrix hybrid control and hybrid control switching mechanism are proposed to ensure the optimal damping effect and smooth switching process of the mounted mower at different driving speeds.On this basis,LQR controller calculates the theoretical control damping force through the current suspension acceleration and dynamic stroke,and drives the neural network of MR damper to output the actual control damping force,so as to realize the control of vehicle model.The communication between the dynamic model in ADAMS and LQR controller in MATLAB / Simulink is realized by using ADAMS / controls module.Through the joint simulation between the system model and the simulation software,it can be concluded that the LQR controller optimized by the improved simulated annealing algorithm can greatly improve the performance of the semi-active seat suspension: the vertical acceleration of the seat suspension is reduced by 67.24%,and the dynamic travel of the suspension is reduced by 14.90%.Compared with multiple single weight coefficient control systems,the RMS value of suspension acceleration of hybrid system is reduced by 15.8%,14.6% and 25.7%respectively,which verifies the effectiveness of semi-active seat suspension control system.