A Research on Thrust Ratio of Front Wheels to Rear Wheels of Front Wheel Assist Tractor

Based on dynamic analysis of Front wheel Assist (FWA) Tractor,a method for calculating the thrust Ratio of front wheels to rear wheels is described in this paper,a mathematical model is established and verified,The article introduces the definition of thrust ratio of front wheels to rear wheels,which is an important parameter affecting the tractive performance of FWA tractor.

The Research on Selecting the Optimum Coefficient of Inharmonious Motion for the Front Wheel Assist Tractor

Based on dynamic analysis for the Front Wheel Assist (FWA) tractor, a calculating and analysing method on selecting the optimum coefficient of inharmonious motion for the FWA tractor is described in this paper and the mathematical models arc also established. The article first time dlefines the ratio of thrust of front wheels to that of rear wheels, which is an important parameter affecting the tractive performance of the FWA tractor and establishes the condition of no power circulation of the FWA tractor. The optimum coefficient of inharmonious motion for a FWA tractor (UTB-445) is also given.

变型四轮驱动拖拉机超前率优化选择的研究

本文通过对变型四轮驱动拖拉机作业中超前率对牵引效率及转向工况影响的研究,从理论上建立了轴间刚性连接的变型四轮驱动拖拉机超前率选择的目标函数及约束方程,在此基础上应用微机进行了超前率的优化计算,得出了轴间刚性连接的变型四轮驱动拖拉机的最佳超前率范围。试验证明,理论研究结果与实际相符。

变型四轮驱动拖拉机前后桥切线牵引力比的研究

通过对变型四轮驱动拖拉机牵引动力学的研究，首次提出了变型四轮驱动拖拉机前后桥切线牵引力比的概念，它是评价四轮驱动变型拖拉机相对两轮驱动基本型拖拉机动力提高程度的重要参数，并推导出该比值的计算公式，试验证明，该公式揭示了变型四轮驱动拖拉机作业中前后桥动力分配的规律。结果为合理地设计及应用变型四轮驱动拖拉机提供了参考依据．