车轮滚动。
A coasting performance test is simulated on a chassis dynamometer, the transmission resistance, rolling resistance of wheels and their speed factors are measured.
利用底盘测功机模拟道路滑行试验，测定出汽车的传动系阻力、轮胎滚动阻力及它们的速度影响系数。
Further theoretical analysis and experiments are made of the principle of the cold forming and design of rolling wheels, and some useful conclusions are drawn.
从冷轧原理、轧辊设计等方面作了进一步的理论分析和工艺试验，得出了一些有用的结论。
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