Vehicle safety and performance can be dramatically improved if force or friction measurement of the tyre-terrain interface is known. Since the tyre-terrain interface is responsible for the majority of forces acting on the vehicle, this region has received a lot of attention in vehicle dynamics. Direct measurement of the tyre-terrain interface is difficult since it is hidden by the tyre and terrain. A lot of research has been conducted on the inside of tyre using accelerometers or strain gauges with research more focussed on passenger car tyres and very little work performed on agricultural tyres with larger lugs. This study performs strain measurements using point measurement, from strain gauges, and full field measurement, using a stereo camera measurement system, of the inside of an agricultural tyre on a drum test rig during vertical and lateral loading. Results show similar trends when compared to results on passenger car tyres, however the mounting of the strain gauge relative to the lug is shown to play a large role in the developed strain. Linear relationships between the applied tyre force and strain were obtained in different direction with R² values above 0.97.

如果已知轮胎-地面接口的力或摩擦力测量，则可以大大提高车辆的安全性和性能。由于轮胎-地形界面负责作用在车辆上的大部分力，因此该区域在车辆动力学方面引起了很多关注。轮胎-地形界面的直接测量是困难的，因为它被轮胎和地形所隐藏。已经使用加速计或应变仪对轮胎内部进行了大量研究，而研究更多地集中在乘用车轮胎上，而对于较大凸耳的农用轮胎所做的工作却很少。这项研究使用应变仪中的点测量进行了应变测量，并使用了立体摄像机测量系统进行了全场测量，垂直和横向加载期间，农用轮胎的内部在转鼓测试台上的位置。与乘用车轮胎的结果相比，结果显示出相似的趋势，但是应变仪相对于凸耳的安装在所产生的应变中起着重要作用。使用R在不同方向上获得了施加的轮胎力和应变之间的线性关系高于0.97的^2个值。