零转弯半径割草机连续翻滚特性的研究

The zero turning radius mowers have good application prosperities due to their zero turn and high working efficiency. According to the continuous roll of the zero turning radius mowers when they operate on the sloping areas,the main objectives of this project focus on:(1)the intensive study of the factors affecting the continuous roll behavior of the zero turning radius mowers;(2) the development of the prediction model for the continuous roll behavior of zero turning radius mowers, computer parametric modeling and simulation,the modification of the structure and design parameters to stop the continuous roll after the loss of the mowers lateral stability, and realize the safty and rapid design of the series zero turning radius mower. The innovation points of this project are:(1)to conduct theoretical analysis and field tests related to the yaw of the zero turning radius mowers resulting from the deck width change；(2) to deeply explore the theory of the yaw influence on the continuous roll behavior of zero turning radious mowers;（3）to explore the energy loss during the roll impact,and provide the theoretical foundation for the design of the mowers and the Roll Over Protective Structure. The research results have the theoretical significance and engineering applicatioon value for the improvement of national mowers safety design.

零转弯半径割草机可以实现原地转弯并且工作效率高，因此应用前景良好。本项目针对零转弯半径割草机在斜坡上作业时容易发生连续翻滚的现象，其主攻方向为:(1)深入研究影响零转弯半径割草机连续翻滚特性的因素；(2)建立零转弯半径割草机连续翻滚预测模型，并进行计算机参数化建模与仿真,改进结构和设计参数，以达到防止其失稳后的连续翻滚,并实现系列割草机的安全及快速设计。本项目的创新点是：（1）针对割草机割草器宽度的变化引起的失稳后的偏航现象展开理论分析及实验研究;(2)深入探索偏航对割草机连续翻滚特性的影响机理；（3）探索翻滚碰撞过程中的能量损失，为割草机及翻滚保护装置的设计提供理论依据。该项目的研究成果为提高我国割草机的安全设计具有理论研究意义及工程应用价值。

零转弯半径（Zero Turning Radius，简称ZTR）割草机可以实现原地转弯并且工作效率高，因此应用前景良好。但ZTR割草机在斜坡作业时经常发生连续翻滚现象造成驾驶员伤亡，针对该现象，深入分析了影响ZTR割草机连续翻滚特性的因素，提出了ZTR割草机从非连续翻滚到连续翻滚临界状态的概念，同时提出了初始偏航、动态偏航及总偏航的概念。发现了割草器宽度对ZTR割草机失稳后的初始偏航影响的基本规律，揭示出总偏航对ZTR割草机连续翻滚特性有重要影响，探索了ZTR割草机翻滚碰撞能量损失。建立了ZTR割草机连续翻滚预测模型, 通过该模型有效预测出了ZTR割草机失稳后的翻滚特性（连续翻滚或非连续翻滚），并预测了割草器宽度与偏航(初始偏航、动态偏航及总偏航）之间的关系及偏航与停止割草机连续翻滚的翻滚保护装置最小高度（又称为临界高度CRH）之间的关系。该项目研究成果为我国割草机的安全设计提供了理论依据。.获得授权发明专利2项。 在美国主要刊物 《Applied Engineering in Agriculture》上发表SCI 论文2篇；发表核心期刊论文2篇；录用核心期刊论文2篇。

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