Analysis of Stability of Forestry Vehicles Driven on Inclined Forest Land

为了分析林业车辆在倾斜林地上行驶时的稳定性，确定其稳定性的临界俯仰角和临界侧倾角，研究结果如下：1）林业车辆可从车辆的形态结构和操作功能的角度进行分类，即集材车型、运输车型（轮式）：微型转发器类型，传输器（Crawler）：通过对小型集材车静态稳定性试验结果的分析，论证了支腿在小型集材车装载作业中的重要性。通过对集材运输车在林地、滑道和林区道路上行驶的试验研究，阐明了集材运输车在林地上行驶时出现的最大摆动角，即俯仰角为14 ° ~ 21 °，侧倾角为12 ° ~ 17 °。特别是，在对林业车辆有意义的横向方向上，得出了在滑路面上19-24 °和在林地上9-12 °作为摆动滚转角的暂定判据。用动力学方法分析车辆在倾斜林地上行驶的运动，包括悬架系统的试验和质量转动惯量的分析，是今后的研究方向。控制住了

The purposes of this study are to analyze the stability of forestry vehicles driven on inclined forest land, and to show critical pitch and roll angle of stability.The results obtained from the study are summarized as follows ;1) Forestry vehicles can be classified from the view point of morphological structure and operational functions of vehicles ; namely Skidder type, Transporter (Wheeled) : Mini-forwarder type, Transporter (Crawler) : Farm tractor type and Mobile yarder type.2) Importance of outrigger was approved in loading operation with Mini-forwarder type vehicles by analysis of results obtained from static stability test of them.3) From the measurements of pitch and roll angle of the loaded and nonloaded Mini-forwarder type vehicle driven on forest land, skid road and forest road, it was clarified that maximum oscillatory angles appear in the vehicles driven on forest land : namely pitch angle is 14-21 degree and roll angleis 12-17 degree.4) The critical angle of stability is calculated from static stability angle and oscillatory angle. Especially, in lateral direction that is meaningful to forestry vehicles, the values of 19-24 degree in skid road and 9-12 degree in forest land are obtained as the tentative criteria of oscillatory angle of roll.5) It was remained in future that the motion of vehicles driven on inclined forest land is analyzed by means of dynamics in which tests of suspension system and analysis of mass moment of inertia are contained.