Ayers Paul, Khorsandi Farzaneh, Wang Xinyan, Araujo Guilherme
Biosystems Engineering and Soil Science, University of Tennessee, 2506 E. J. Chapman Drive, Knoxville, TN 37996, United States.
Mechanical Engineering Department, Jiangsu University of Science and Technology, Zhenjiang, China.
J Terramech. 2018 Feb 28;75. doi: 10.1016/j.jterra.2017.05.003.
Although it is well known that properly used Rollover Protective Structures (ROPS) can virtually prevent agricultural tractor rollover fatalities, the U.S. still has hundreds of these fatalities per year. An estimated 1.6 million tractors are not equipped with ROPS. Many of these tractors do not have ROPS commercially available although they were originally designed to support a ROPS. Some tractors have foldable ROPS that are not used properly. Other ROPS, although meet appropriate performance standards, are not effective at eliminating continuous rolls. To meet this need, a Computer-based ROPS Design Program (CRDP) was developed to quickly generate ROPS designs based on agricultural tractor weights and dimensions. The ROPS designed with the CRDP for the Allis Chalmers 5040 tractor successfully passed the SAE J2194 static longitudinal, transverse, and vertical tests. A simple foldable ROPS lift assist was designed and tested to ease in the raising and lowering of ROPS; decreasing the raising torque from 90 Nm to less than 50 Nm, while also lowering the resisting torque to lower the ROPS. A model to determine the critical ROPS height CRH based on off-road vehicle dimensions and center of gravity (CG) height was developed and evaluated.
尽管众所周知，正确使用翻车保护结构（ROPS）实际上可以防止农用拖拉机翻车致死事故，但美国每年仍有数百起此类死亡事故。据估计，有160万台拖拉机未配备ROPS。这些拖拉机中有许多虽然最初设计时能够支持安装ROPS，但市面上却没有适合它们的ROPS。一些拖拉机配备了可折叠ROPS，但使用不当。其他ROPS虽然符合适当的性能标准，但在消除连续翻滚方面效果不佳。为满足这一需求，开发了基于计算机的ROPS设计程序（CRDP），以便根据农用拖拉机的重量和尺寸快速生成ROPS设计。使用CRDP为阿利斯·查尔默斯5040拖拉机设计的ROPS成功通过了SAE J2194静态纵向、横向和垂直测试。设计并测试了一种简单的可折叠ROPS升降辅助装置，以方便ROPS的升降；将提升扭矩从90牛米降低到小于50牛米，同时也降低了抵抗扭矩以降下ROPS。开发并评估了一个基于越野车辆尺寸和重心（CG）高度来确定关键ROPS高度（CRH）的模型。
