笔者在长期的工程实践中发现，传统的圆拱状断面隧道承压能力分析方法有一定的缺陷，圆拱状断面隧道拱壁支承力的传递有一定的规律可循。
The author, with his practice in his long working time , discover some blemish in the traditional way of analysis on arch supporting force of tunnel with circular arch section.
从分析其受的摩擦力出发，讨论了最大摆角变化的规律；计算摩擦力作功的简便方法；运动方程及振动经历的时间问题。
Starting with the friction underwent, we discuss the regularity of the variety of the max swing angle, the simple way to work out the friction doing work and the equation of motion etc.
对汽车碰撞计算机模拟方法作了简要的分析，给出了轿车碰撞轿车、轿车碰撞货车、碰撞过程中能量、碰撞力的变化规律。
This paper gives brief analysis of vehicle crash computer simulation, the statstics analysis rules of car to car, car to truck and the rules of energy and force in the crash are given.
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