立式秸秆粉碎还田机机架振动分析与优化

Finite element modal analysis and experiment of the frame of 4JH-180 vertical straw crushing and returning machine

【目的】针对立式秸秆粉碎还田机工作时因各零部件产生的激振力给机架带来的振动问题.【方法】利用模态分析软件求解机架的仿真模态频率和振型,并对机架进行模态试验,通过比较两者分析结果,验证了理论分析的准确性.通过改变机架结构尺寸,增加固定结构的方法,开展仿真实验.【结果】试验结果表明:在机架各梁厚度增加1 mm,结构增加一个支撑架、一个配重板、一块钢板,整体质量增加3.38%的情况下,机架的前4阶模态频率从11.641、36.527、65.859、94.601 Hz调整到16.612、38.699、68.804、98.698 Hz,避免了共振的发生.【结论】该研究为秸秆粉碎还田机机架结构的设计与优化提供了参考.

【Objective】Aiming at the vibration of the frame caused by the excitation force generated by each component when the vertical straw crushing and returning machine is working.【Method】The modal analysis software is used to solve the simulation modal frequency and vibration of the frame.The modal test was performed on the frame,and the accuracy of the theoretical analysis was verified by comparing the analysis results of the two.By changing the dimensions of the frame,adding a method of fixed structure,and carrying out simulation experiments.【Result】When the thickness of each beam of the frame is increased by 1mm,a support frame,a counterweight plate,and a steel plate are added to the structure,and the overall mass increases by 3.38%,the first four mode frequencies of the rack are adjusted from 11.641,36.527,65.859 and 94.601 Hz to 16.612,38.699,68.804 and 98.698 Hz to avoid the occurrence of resonance.【Conclusion】This research provides a reference for the design and optimization of the frame structure of the vertical straw crushing and returning machine.