Abstract This study determines the effect of tire inflation pressure on the real-time estimation of the rating cone index (RCI) of a soil using wheel sinkage. It is postulated that wheel sinkage, slip, and tire deflection change with tire inflation pressure. The effect of tire inflation pressure on soil strength estimation is verified by using the equation for RCI estimation. Experiments are conducted to measure wheel sinkage, slip, and tire deflection at different tire inflation pressures. The results show an increase in wheel sinkage and slip and a decrease in tire deflection with a change in tire inflation pressure. A statistical analysis of the experimental results is conducted to assess the influence of tire inflation pressure on RCI estimation. The test results show that the calculated the RCI changes with variations in tire inflation pressure. These results help determine the range of tire inflation pressure that indirectly estimates RCI. In addition, a modified equation is proposed to estimate the RCI irrespective of the tire inflation pressure, and its accuracy is verified through calculations. When estimating the RCI through a new equation, constant soil strength can be estimated regardless of the tire inflation pressure. The average error rate of the estimated RCI in each tire inflation pressure was 1.59%.

中文翻译：

---

轮胎充气压力对车轮下沉率估计锥度指数的影响

摘要 本研究确定了轮胎充气压力对使用车轮下沉量实时估计土壤等级锥指数 (RCI) 的影响。假设车轮下沉、打滑和轮胎挠度随轮胎充气压力而变化。轮胎充气压力对土壤强度估计的影响通过使用 RCI 估计方程来验证。进行实验以测量不同轮胎充气压力下的车轮下沉、打滑和轮胎挠度。结果表明，随着轮胎充气压力的变化，车轮下沉和打滑增加，轮胎挠度减少。对实验结果进行统计分析以评估轮胎充气压力对 RCI 估计的影响。测试结果表明，计算出的RCI随轮胎充气压力的变化而变化。这些结果有助于确定间接估计 RCI 的轮胎充气压力范围。此外，提出了一个改进的方程来估计 RCI，而不考虑轮胎充气压力，并通过计算验证了其准确性。通过新方程估算 RCI 时，无论轮胎充气压力如何，都可以估算出恒定的土壤强度。每个轮胎充气压力的估计 RCI 平均误差率为 1.59%。通过新方程估算 RCI 时，无论轮胎充气压力如何，都可以估算出恒定的土壤强度。每个轮胎充气压力的估计 RCI 的平均误差率为 1.59%。通过新方程估算 RCI 时，无论轮胎充气压力如何，都可以估算出恒定的土壤强度。每个轮胎充气压力的估计 RCI 的平均误差率为 1.59%。