Research Of The Vibration Control Of The Cutter Carrier Of Small Sugarcane Harvester

High rate of Sugarcane head broken is a difficult problem to be solved in domestic Sugarcane Harvester at present.The results show that the size of head broken has a great correlation with the vibration displacement of the cutter.Based on this conclusion,this paper takes small sugarcane harvester experimental platform as the research object,and explores how to reduce the vibration of the cutter and control it with 0.25 mm,to reduce the vibration of the cutter and reduce the breaking rate.This thesis is mainly divided into the following parts:1)?Finite element analysis of the frame model,including strength analysis,stiffness analysis,modal analysis,frequency response analysis,mainly from the static characteristics,dynamic characteristics of the evaluation of the performance of the frame.The above strength analysis and stiffness analysis are used to check the safety performance of the structure so as to ensure that the designed frame can work normally without causing serious deformation to bring safety risks to vehicles and personnel.Modal analysis and frequency response analysis are mainly used to evaluate whether the dynamic performance parameters of the cutter are reasonable or not.According to the analysis result of frequency response,the vibration response of the cutter is too large at 31 Hz and 50 Hz.2)?According to the collected sugarcane road spectrum and its analysis,On the experimental platform,the mechanical vibration excitation device is used to simulate the road surface excitation,and it is reproduced and acted on the frame.The motor dynamic excitation of sugarcane harvester is simulated by frequency conversion exciting motor,and they are acted on the experimental platform together.The dynamic characteristics of the front end of the cutter were collected by LMS test.lab,and the frequency spectrum was analyzed.The vibration transfer function,modal tests were conducted to find out the causes of the excessive vibration of the cutter.3)?Multi-excitation test analysis.Under the combined action of the road excitation signal and the engine power signal,the experimental model is analyzed and the initial response of the prototype model is obtained.The virtual experiment design is carried out with the position of oil cylinder,the spring stiffness of the shock absorber and the damping as the variable.According to the results of the virtual test analysis,the parameters of oil cylinder position,shock absorber spring stiffness and damping are modified.4)?Optimize the system structure.Based on the results of finite element analysis,the optimum design of the prototype is made according to the common vibration response of the cutter 31 Hz,51Hz.Through modal analysis,the crossbeam is added to the longitudinal beam of the cab,and the topological structure of the cutter is optimized with 31 Hz as the optimization objective.The optimization results show that the peak at 31 Hz has disappeared and the peak at 51 Hz has been reduced to two small peaks after adding crossbeam.After topology optimization,the peak value of the structure at 31 Hz,51Hz has disappeared,and the performance of the prototype has been optimized.5)?Experimental verification.Taking the above optimization factors,that is,adding crossbeam,optimizing the position of oil cylinder and the topological structure of the cutter as experimental factors,the single factor and mixed orthogonal test are carried out,The optimal combination of optimization factors and the primary and secondary order affecting the response of the cutter are obtained.The test results show that compared with other factors,the cutter structure has a great influence on the amplitude and acceleration RMS of the cutter.In the case of three factors mixing level,the main factors order affecting the response of the cutter are its' structure,the crossbeam structure and the position of the oil cylinder.The best combination is B2A3C2.