在普通十字轴万向节二次力矩的基础上，推导出环叉式万向节二次力短的瞬时表达式。
On the base of the second couple of the common cross U-jioint. a transient value of the second couple in the ring-fork U-joint is obtained.
通过分析聚焦声场的特性，得到了聚焦区附近的瞬时声压表达式。
The expression for instantaneous pressure near the focusing area was obtained by analyzing the characteristic of focusing acoustic field.
计算出运动状态下轮胎印迹纵向瞬时变形的数学表达式。
Mathematical expression of longitudinal transient deformation of tyre tread imprint under motion condition has been derived.
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