Ground based forest harvesting machines are being used on steeper slopes with the aid of tethers to help maintain traction and stability. It is common to position a base machine containing the tether winch above the forest harvesting machine. This configuration is termed a live tether. The live tethers may be run around rub trees to reduce the time required to reposition the tether. This study developed a new model that includes both friction and cutting forces to estimate cable tension on either side of the rub tree. A dataset collected in the field was used to estimate the parameters in the model. The model appears to be promising; however, further work is required on the interaction of the cable cutting surfaces and the surface toughness of the wood. In general, it was found that the difference in the tension on either side of the rub tree increased with increasing change in angle, that the cable on average cut 3 mm deeper with each 10 m of the cable travel, and that the difference in tension was not correlated with the depth cut into the wood.

中文翻译：

---

在陡坡森林采伐期间使用树木重新引导活机绳索对绳索张力的影响

地面森林收割机在较陡峭的斜坡上使用系绳，以帮助保持牵引力和稳定性。通常将包含系绳绞盘的基础机器放置在森林采伐机器上方。这种配置被称为实时系绳。活的系绳可以在摩擦树周围运行以减少重新定位系绳所需的时间。这项研究开发了一种新模型，其中包括摩擦力和切割力，以估计摩擦树任一侧的电缆张力。在现场收集的数据集用于估计模型中的参数。该模型似乎很有希望。然而，还需要进一步研究电缆切割表面和木材表面韧性的相互作用。一般来说，