玉米收获机准静态横向稳定性数学建模与试验  

Mathematical Modeling and Experiment of Corn Harvester Quasi-static Lateral Stability

作　　者：马丽娜[1] 杜岳峰[1] 宋正河[1] 毛恩荣[1] 

机构地区：[1]中国农业大学工学院,北京100083

出　　处：《农业机械学报》2016年第7期89-95,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：现代农业装备与技术协同创新中心项目(NZXT01201401);中央高校基本科研业务费专项资金项目(2015QC009)

摘　　要：综合玉米收获机后桥摇摆轴结构以及前、后桥轮距不等因素,建立了玉米收获机准静态横向稳定性数学模型,并进行了仿真分析和整机侧倾试验,二者结果相对误差仅为2.59%,验证了该模型的正确性,明确了整机横向稳定性的影响因素。然后,利用编码变换,将各影响因素的变化范围转换到[-1,1],实现了不同影响因素对横向稳定性系数λ影响程度的可比性,从而明确了玉米收获机准静态横向稳定性的关键影响因素是:轴距x、整机重心高度h、重心到前桥的距离a以及前轮轮距t1。最后,提出了提高整机横向稳定性的措施。研究结果表明,整机重心h降低100 mm,空载前后桥载荷比i提高至4,且采用对称布置的试验样机,横向稳定性可提高19.03%。On the basis of studying both at home and abroad,not only the orientation of the corn harvester rear axle pivot had been considered,but also the track width differences between front axle and rear axle had been taken into account,thus a more accurate quasi-static lateral stability mathematical model was constructed. Then lateral stability experiment and simulation analysis were carried out in order to verify the validity of the model. Accordingly the lateral stability influence factors were obtained.Afterwards,each influence factor was firstly set at a certain range of values,then the value range of each influence factor was converted into an identical range [-1,1],taking advantage of encoding transform.Therefore the curve of lateral stability indicator λ changing with the varying of different influence factors could be drawn in the same picture which could directly show the impact extent each factor on the lateral stability. The analysis results showed that the main influence factors of corn harvester quasi-static lateral stability were wheel base x,the height of corn harvester center of gravity h,the distance between the center of gravity and front axle a,as well as front axle track width t1. In the end,this paper also put forward several measures to improve the lateral stability of the whole machine. When the center of gravity is lowered by 100 mm,the load ratio of the front and rear axle is increased to 4,as well as the symmetric machine model is adopted. The result shows that the alteral critical angle of the corn harvester can be increased from 24. 8° to 29. 52° and the lateral stability can be raised by 19. 03%. The establishment of corn harvester quasi-static lateral stability mathematical model can provide a foundation for corn harvester overall arrangement and structure design.

关 键 词：玉米收获机 准静态横向稳定性 数学模型 侧倾试验 

分 类 号：S225.51[农业科学—农业机械化工程]