The wheel and axle is a rotating lever.

轮轴是一个转动的杠杆。

The wheel and axle is really a sort of lever.

轮轴实际上是一种杠杆。

Aim To realize optimized construction and volume of rail wheel and axle in complex loads with finite element analysis.

目的通过对火车轮轴在复杂载荷作用下的有限元分析，实现火车轮轴结构与体积的优化。

The wheel and axle of the Han Dynasty are an important subject of study for the history of Chinese science and technology.

汉代的轮轴工艺，是中国古代车制研究的重要内容，也是中国科技史上的重大课题之一。

Optimized design of rail wheel and axle is finished. Conclusion This result satisfies our national railway standard. The maximum stress is less than the yield stress.

结论实现火车轮轴的优化设计，优化后轮轴的最大应力均小于屈服应力，满足我国铁路的标准要求。