基于磁流变阻尼器的电动微耕机振动特性仿真试验分析OA

The strong vibration generated during the long-term field operation of the electric micro-cultivator would bring physical and mental discomfort to the operator,and even lead to substantial damage and occupational diseases.In view of the above problems,a mathematical modeling combined with Simulink simulation method based on magnetorheological damper was proposed to study and analyze the vibration characteristics of electric micro-cultivator.Firstly,the mathemati-cal model of the vertical direction of the electric micro-cultivator was established,and the main excitation force of the sys-tem was calculated and analyzed.Based on the vibration differential equation of the system,the simulation model was con-structed in Simulink for simulation analysis.The time-domain variation curves of vibration acceleration at the frame and the armrest were obtained,and the RMS values were 4.212 and 5.325 m/s2,respectively.Secondly,in the field experi-ment,the RMS values of the frame and the armrest were 4.55 and 5.09 m/s2,respectively,and the relative error with the simulation value were 7.4%and 4.6%,the error was small.Based on the adjustable Sigmoid model,the parameters of the magnetorheological damper were identified to obtain the various parameters,and the simulation model was construc-ted through Simulink on the basis of its mathematical expression to compare the simulation data with the actual data,which proved that the model was more accurate and reasonable.At the same time,combination and simulation with the simula-tion model of the electric microponic machine was carried out to obtain that the RMS values of the frame and the armrest frame under the excitation currents were reduced,which provided a theoretical reference for the subsequent semi-active control design of the magnetorheological damper and the vibration reduction optimization of the electric micro-cultivator.