港口牵引车液压系统中的转向泵在发动机高速状态时的能量损失较大。
The efficiency of steering pump of port tractor lost very heavy when engine was in high speed.
通过直管障碍的仿真实验，得出了牵引器在直管中越障时各组件的工作状态、直管越障阻力与设计牵引力的比例关系。
By simulation of the tractor in straight oil pipe with obstacle, discussed the working situation of components and the relation between drag force and the force need to cross obstacle.
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