Amongst all the working elements of single grip harvesters, the working elements of felling and processing play an important role within the cut-to-length (CTL) harvester’s working phases. This includes the felling cutting and cross-cutting of stems within the felling and processing operation. The detailed investigation of such individual machine activities may help to analyse and improve the performance of forest machines. The objective of this study was to investigate the cutting duration and other performance parameters, including the fuel consumption, of a CTL harvester’s sawing unit under real working conditions. Detailed information on the felling cutting and cross-cutting performance was collected at short intervals using CAN bus data of two single grip harvesters in final felling from two different sites in Eastern Finland. As a result, models for effective time consumption in the work phase of cutting as a function of stem size were developed, both for felling cutting and cross-cutting. Felling cutting and cross-cutting durations were somewhat identical until the cutting diameters of 400–450 mm, depending on the site. Thereafter, the cutting time difference increased and was higher in felling cutting. At the site with large diameters of 550–650 mm, the difference varied between 15% and 28%, between the comparisons of formulae. In addition, other performance parameters, including the respective fuel consumption of this working phase, were part of the study. The study revealed a higher hourly based fuel consumption for the entire guide bar movement time compared to the pure cutting time in cross-cutting with stem diameters below 400 mm. Detailed knowledge of the performance of the sawing unit’s activities might help the planning process of future studies, as well as support the future development of efficient and intelligent machinery.

中文翻译：

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实际工况下收割机锯切单元的切割持续时间和性能参数

在单柄收割机的所有工作要素中，伐木和加工的工作要素在定长切割 (CTL) 收割机的工作阶段中发挥着重要作用。这包括在砍伐和加工操作中对茎进行砍伐和横切。对此类单个机器活动的详细调查可能有助于分析和改进林业机器的性能。本研究的目的是调查 CTL 收割机锯切装置在实际工作条件下的切割持续时间和其他性能参数，包括燃料消耗。使用来自芬兰东部两个不同地点的两台单柄收割机在最终砍伐中的 CAN 总线数据，在短时间内收集了有关砍伐和横伐性能的详细信息。因此，开发了在伐木工作阶段有效时间消耗与茎尺寸的关系模型，包括伐木和横伐。在切割直径为 400-450 毫米之前，伐木和横伐持续时间有些相同，具体取决于现场。此后，切削时间差增加，并且在伐木切削中更高。在具有 550-650 毫米大直径的场地，配方比较之间的差异在 15% 和 28% 之间。此外，其他性能参数，包括该工作阶段的相应燃料消耗，也是研究的一部分。研究表明，与杆直径低于 400 毫米的横切中的纯切割时间相比，整个导杆移动时间的每小时油耗更高。