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该文在研究落球回弹理论的基础上,提出用自由落球的方法测量润滑油的极限剪应力比例系数,经实验表明,误差较小,是一种新颖的测量方法.“,”On the basis of the research of a ball impacting and rebounding a lubricated surface, the method of utilizing free falling ball is put forward to measure limiting shear strength proportionality constant of lubricated oil in this paper. The experiment shows it has small error and is a new measuring method.