球轴承半径对滚动摩擦影响的研究
Research on rolling friction's dependence on ball bearings' radius
摘要：
法国科学家库仑和迪普伊提出了两个可供选择的滚动阻力历史定律。已经决定再次通过实验验证，这些定律中哪一个更好地描述了硬表面上的自由滚动球轴承。进行测量的一个诱因是路基厚度恒定的想法，这与Dupuit的理论一致。测量已完成使用阻尼振荡的摆轴承。结果表明，与库仑理论的小，但可测量的偏差更好的一致性。这些偏差被成功地解释了所谓的“鹅卵石模型”。该模型所指定的参数已成功地通过表面粗糙度的轮廓测量进行了验证。这项工作的另一个理论方面是区分两种类型的滚动摩擦力：动力学和运动学的类比，在气体热力学的两种类型的比热容。
英文摘要：
There are two alternative historical laws of rolling resistance formulated by French scientist Coulomb and Dupuit. It has been decided to verify experimentally again, which of these laws describes freely rolling ball bearings on a hard surface better. An inducement to carrying out the measurements was the idea of the constant thickness of roadbed, which is consistent with Dupuit's theory. Measurements have been done using the damped oscillations in the pendulum bearings. Results have shown better consistency with the Coulomb's theory with small, but measurable deviations. These deviations were successfully explained by the so called "Cobblestones model". Parameters designated by this model have been successfully verified by the surface roughness's profile measurement. An additional theoretical aspect of this work is distinguishing two types of rolling friction force: dynamical and kinematical in an analogy to two types of specific heat capacity in the thermodynamics of gases.
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