Authors

Abstract

In view of high center of gravity and poor stability of traditional corn harvesters, a corn combine harvester frame is designed for hill and mountain operations based on TRIZ theory. The frame supports engine mode of middle engine rear drive, consisting of a front frame and a rear frame. The tail of the front frame is welded under the head of the rear frame. The front frame has reduced height and increased width to allow lower center of gravity and better stability of the whole machine. The left and right longitudinal beams of the front frame have different heights to allow better trafficability of the whole machine. A 3D model is established using Solidworks software and incorporated with ANSYS software to perform finite element analysis and modal analysis on the frame. It turns out that under full-load bending and full-load torsion conditions, the frame strength and stiffness meet the mechanical performance requirements, and the frame displays fine dynamic characteristics. According to the analysis results, the frame is optimized under the goal of light weight. While the frame strength and stiffness requirements are met, the frame mass is lowered by changing the frame component thickness. After optimization, the entire frame volume is reduced by 14.27%, with mass reduced by 14.3%, and the strength and stiffness conform to the requirements, thus achieving lightweight optimization of the frame.Moreover, The stability analysis of the corn combine harvester shows the overturning angle of uphill is 45.3°, the overturning angle of downhill is 45.7°, and the overturning angle of slopel is 40.2°.

Abstract in English

为解决传统玉米收获机重心高、稳定性差等问题，基于TRIZ理论设计了一种适合丘陵山地作业的玉米联合收获机车架。该车架适合于发动机中置后驱形式，车架由前框架和后框架组成，前框架尾部焊接在后框架头部之下，前框架高度降低、宽度增加，有利于降低整机重心，提高整机稳定性，前框架左右纵梁高度不同，提高整机的通过性。利用Solidworks 软件建立三维模型，导入 ANSYS 软件对车架进行有限元分析和模态分析，结果表明在满载弯曲和满载扭转工况下，车架强度和刚度均满足力学性能要求，车架动态特性良好。根据分析结果，以轻量化为目标对车架进行优化，在满足车架强度和刚度要求的前提下，通过改变车架构件板厚的方式实现车架的轻量化，优化后整个车架体积减少14.27%，质量减少14.3 %，强度和刚度均符合要求，达到了车架轻量化优化目的，最后整车稳定性分析表明收获机上坡极限倾翻角度为45.3°，下坡极限倾翻角度为 45.7°，横向极限倾翻角度为40.2°。