Vibration Performance And Optimal Design Of Micro Planter And Fertilizer Machinery In The Mountains

Micro planter and fertilizer machinery is ease and flexible to operate,reliable to use and convenient to repair with its simple and compact structure.Therefore it is widely used for crop production in the mountains,hills and plains.However,due to the improper design of vibration reduction,the problems of violent vibration and fierce handle shaking etc.are frequently to be seen.This paper studies and analysis the vibration of the machinery in depth,and put forward a effective measures to reduce the vibration,this research has high practical value for improving work performance of the machinery.The main research contents the following several aspects:1)The first six natural frequency and vibration mode of the frame was get by the modal test,and compared the first one natural frequency with the engine vibration frequency could find that the two values are very close;The vibration magnitude of the machine was get by the vibration test,the results of the test showed that the vibration of handles and frame are very big,and this results conformed to the actual situation that the machine was very hard to control.2)a five DOF(degree-of-freedom)mathematical model of planter and fertilizer machinery was established,the simulation model of the system was built with Matlab/Simulink software.The frame's vertical vibration acceleration and pitching angle acceleration was get by the simulation analysis.The results of the simulation analysis conformed with the results of vibration test.3)Genetic algorithm was applied to optimize the design of the system and the optimized results showed that root mean square of the vertical vibration acceleration on the rack of the optimized machine reduced by 32.9%,root mean square of the elevation angular acceleration reduced by 37.6%,and the minimum of objective function was reduced to 0.3349 from 0.3705 after optimization;based on this,putting forward the vibration reducing measures including replacing the original iron track with rubber track,replacing the original damper,adding rubber shock absorber connecting engine and rack.4)the comparison test of vibration before and after the optimization was conducted.The comparison test demonstrated that,at the depth of 4-5 cm,the vertical vibration on the engine reduced by 32.86%,the vertical vibration on the rack reduced by 28.31%,the vertical vibration on the handrail reduced by 42.35%;while at the depth of 9-10 cm,the vertical vibration on the engine,the rack and the handrail reduced by 37.36%,18.49%,and28.40%,respectively.The result showed that the vibration of the improved machine was significantly reduced,and verify the effectiveness of the improvement measures.