トラクター運材に於ける雪橇の抵抗に關する二三の實驗

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Result of some experiments measuring the amounts of resisting forces coused dy snowsledges used for logging, when they were pulled by a tractor, are reported in this article. Resisting forces were measured with a tensionmeter, the coefficients of net running resistanceand these of start resistance calculated, and some factors such as the conditions of snow surface, pullng speed etc., whicn were concidered the values of coefficients, investigated. The experiments were performed on March to give any influenceto 6,1948,in the National Forest logging place at Takanosu in Akita prefecture. A Mitsubishi T-25 type 3t caterpillartractor and usual woo den sledges loaded with Sugi-logs weighted 3280 to 7760 kg and connected with wireropes were used for the purpose.Analysing the result of the experimets, followings are suggested.1) Mean values of coefficient of net running resistance varries detween 35-74 kg/t when the mean velocity of the sledge shows 5.33-9.47 km/hr.2) Smaller resiatance are caused in the case of running on snow surface than in the case of running on soil surface.3) Resistance increases when running speed increases.4) Larger resistance occurs on virgine snow surface than on sledge-way of compact snow.5) Large deviation of the amount of net running resistance obsereved, and the maximum value of which may be decresed when the connecting methods are improved.6) Resisstance of start (107〜243 kg/t) is 2-3 times larger than the value calculated theoretically, in which the initial velocity of the sledge is assumed to be equal to that of the tractor itself. The necessity of improving to the connecting devices are also suggested.
一般社団法人日本森林学会の論文
1948-09-30

トラクター運材に於ける雪橇の抵抗に關する二三の實驗

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