| For a long time,the vibration problem has a significant impact on the harvester in the field harvesting operation.If it is not controlled and resolved in a timely manner,it will cause damage to the key components of the harvester and eventually cause the failure of the whole machine,which will cause its production efficiency Reduced as well as economic losses.The harvester’s frame carries the main components such as the engine,the cab,and the silo.During the operation,it will also be affected by various incentives.Therefore,the research on the vibration characteristics of the harvester frame is of great significance.Aiming at the problem of large frame vibration caused by various excitations of a certain type of combine harvester during work,this paper analyzes the vibration characteristics of the frame of the harvester and optimizes the structure to achieve the purpose of improving the frame vibration.First,a preliminary experiment of the vibration analysis of the harvester frame was carried out;then,an indoor vibration test of the harvester frame was carried out;then,on the basis of completing the establishment of the three-dimensional model of the frame,the Bernoulli-Euler classic beam model was selected and the shell The unit meshed it and obtained the finite element model of the harvesting locomotive frame.Subsequently,the modal test of the frame was conducted to verify the correctness of the finite element calculation modal.Secondly,the static analysis of the frame under the two conditions of empty load and full load of the granary was carried out,and the stress and strain cloud diagrams of the frame were obtained.After that,the material optimization and size optimization of the frame were improved.Finally,the article also carried out indoor vibration test,finite element calculation modal analysis and field test on the optimized frame,and compared with the results before optimization.The research results show that: after the optimization of the frame structure,the maximum stress is below the yield limit of the frame material,and the stress distribution is more uniform;the second-order natural frequency is increased from 43.2 Hz to 52.8 Hz,effectively avoiding the frame vibration The main frequency is 45 Hz,and the low-order modes are controlled.At the same time,the acceleration amplitude of each measurement point is reduced by a certain amount compared with that before optimization,and the vibration of the frame is indeed improved to a certain extent. |
