土壤摩擦力还随固体表面光洁度降低而增加，随表面硬度增加而趋于减小。
The friction increases with the decrease in solid surface finish and tends to decrease with the increase in its surface hardness.
振动使土壤的抗剪强度下降是切削阻力下降的主要原因，同时，铲斗与土壤间摩擦力和粘附力下降，也是切削阻力下降的原因之一。
The main reason is that the cutting intension of soil reduced due to vibrating, and another one is the deducing of friction between bucket and soil.
计算了波纹板表面的压力分布，并指出在土壤与农机具粘附系统中波纹形表面摩擦力最大的位置。
For analyzing the adhesion between soil and tillage tools, the profiles of pressure on the wave bulldozing plates were calculated, and we located the position of the maximum friction on the surface.
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