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几十年来,我国森林采伐一直使用带搭载板的履带拖拉机进行集材。这种一端在地面拖曳,另一端离开地面由搭载板支承的木材运输方式,完全不同于一般的车辆运输。而象我国集材-50拖拉机这种通过搭载板和绞盘机钢索来支承和固结原条前端的集材,在世界上更属少见。关于这种特殊形式的运动,研究的还相对不多。我国文献上见到的只有高等林业院校教材《森林采伐学》(林业出版社、1984)上介绍的计算方法。该计算法的特点是简单地把原条重量分成两部分:一部分由地面支承,另一部分由拖拉机支承。地面部分的重力乘上原条同地面的摩擦阻力系数,即
For decades, deforestation in China has been using a crawler tractor with a loading plate for skid-laying. This type of timber transporting with one end being dragged on the ground and the other end off the ground supported by a loading plate is totally different from ordinary vehicle transportation. However, it is rare in the world that the skid-mounted and winch ropes are used to support and consolidate the front ends of the original bars. There is relatively little research on this particular form of sport. In the literature of our country, only the calculation methods introduced in the textbook “Forest Harvesting” (Forest Publishing House, 1984) of the higher forestry colleges and universities are seen. The characteristic of this calculation method is simply to divide the weight of the original bar into two parts: one part is supported by the ground and the other part is supported by a tractor. The gravity of the ground section multiplies the friction coefficient of the original strip with the ground, ie