ABSTRACT

The goal of this study was to compare wheel-rut development between a conventional 8-wheel forwarder and a 10-wheel forwarder. Two Ponsse Buffalo forwarders with 14 metric ton load capacity were compared; one with a standard double-bogie undercarriage and one with double-bogies plus an auxiliary back axle. Both forwarders were equipped with bogie-tracks front and back; the 8-wheeler with standard traction tracks on the rear bogie, the 10-wheeler with combi-tracks. The comparison was set up with two parallel forwarding trails leading down from the landing over marine sediments (coarse sand) to four parallel strip roads over a 4 m deep bog. Seven blocks with three transects per block were laid out to follow the breakdown of the harvest residue layer (above the humus surface) and development of rut depth (below the humus surface) after each loaded pass. Ruts deeper than 10 cm were found on 19% and 31% of transects after 5–10 and 15–20 passes for the 8-wheel forwarder, respectively. The corresponding figures for the 10-wheel forwarder were 7% and 12%, respectively. Using linear regression, 79% of the variation in rut depth could be explained by pass interval, forwarder type, and pre-harvest soil moisture content. The auxiliary axle with suitable bogie-tracks offers increased site availability in moderate terrain during frost-free periods.

摘要

这项研究的目的是比较传统的8轮货运代理和10轮货运代理之间的轮辙发展。比较了两个Ponsse Buffalo货运代理，它们的负载能力为14公吨；一种带有标准双转向架底盘，另一种带有双转向架加辅助后桥。两家货运公司的前后都装有转向架履带。后转向架上带有标准牵引履带的8轮，带组合履带的10轮。进行比较时，从海底沉积物（粗砂）上的着陆点到两条深达4 m的沼泽地的平行四条平行道路设置了两条平行的前行路径。布置七个块，每个块三个样点，以追踪每次装载通过后收获残余物层的分解（腐殖质表面上方）和车辙深度（腐殖质表面以下）的发展。在8轮运输工具通过5-10和15-20之后，分别在19％和31％的横断面上发现了厚度超过10厘米的车辙。10轮货代的相应数字分别为7％和12％。使用线性回归，车辙深度变化的79％可以通过通过间隔，货运代理类型和收获前土壤含水量来解释。带有合适转向架履带的辅助车桥在无霜期的中等地形下可提高工地利用率。10轮货代的相应数字分别为7％和12％。使用线性回归，车辙深度变化的79％可以通过通过间隔，货运代理类型和收获前土壤含水量来解释。带有合适转向架履带的辅助车桥在无霜期的中等地形下可提高工地利用率。10轮货代的相应数字分别为7％和12％。使用线性回归，车辙深度变化的79％可以通过通过间隔，货运代理类型和收获前土壤含水量来解释。带有合适转向架履带的辅助车桥在无霜期的中等地形下可提高工地利用率。