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.

中文翻译：

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ROPS 设计可在农用拖拉机翻车期间保护操作员

尽管众所周知，正确使用翻车保护结构 (ROPS) 几乎可以防止农用拖拉机翻车事故，但美国每年仍有数百起此类事故。估计有 160 万台拖拉机未配备 ROPS。尽管这些拖拉机最初设计用于支持 ROPS，但其中许多拖拉机都没有商用 ROPS。一些拖拉机的可折叠 ROPS 使用不当。其他 ROPS 虽然符合适当的性能标准，但在消除连续轧辊方面效果不佳。为了满足这一需求，开发了基于计算机的 ROPS 设计程序 (CRDP)，以根据农用拖拉机的重量和尺寸快速生成 ROPS 设计。使用 CRDP 为 Allis Chalmers 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。设计并测试了一个简单的可折叠 ROPS 升降辅助装置，以简化 ROPS 的升高和降低；将提升扭矩从 90 Nm 降低到 50 Nm 以下，同时降低阻力扭矩以降低 ROPS。开发并评估了基于越野车辆尺寸和重心 (CG) 高度确定临界 ROPS 高度 CRH 的模型。