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刚体平面运动是理论力学课程刚体力学部分的重点教学内容。本文根据平面运动的特点和学生的认知习惯,在该内容的教学中,首先采用对比教学法分析平面运动与平动的不同,使学生的认识能从简单的平动顺利过渡到复杂的平面运动;然后增加了作平面运动的刚体运动情况能以一个平面的运动情况来代表的证明,让学生对该代表的因果关系达到理论上的认识;接着在介绍速度瞬心的时候补充加速度瞬心的介绍,加深学生对速度瞬心的特点及作用的理解;最后分析了平面运动在讨论运动学问题和动力学问题时的不同分解要求,为进一步讨论刚体平面运动的动力学方程建立作铺垫。 相似文献
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The cellular automaton model is suggested to describe the traffic-flow at the grade
roundabout crossing. After the simulation with computer, the fundamental properties
of this model have been revealed. Analysing this kind of road structure, this paper
transforms the grade roundabout crossing with inner-roundabout-lane and
outer-roundabout-lane into a configuration with many bottlenecks. Because of the
self-organization, the traffic flow remains unblocked under a certain vehicle
density. Some results of the simulation are close to the actual design parameter. 相似文献
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运用具有内、外环道的平面环形交叉路口元胞自动机模型,利用交通流基本图从瓶颈的角度研究了车道尺度对平面环行交叉路口交通流的影响。计算机模拟结果表明:同步增加内、外环道长度时,内环道流量将会增加;同步增加入、出环车道长度时,内环道流量保持不变。 相似文献
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This paper presents a cellular automaton traffic flow model with an open boundary condition to describe the traffic flow at a roundabout crossing with an inner roundabout lane and an outer roundabout lane.The simulation results show that the boundary condition,bottlenecks and the self-organization affect the traffic flow at the roundabout crossing.Because of the effect of bottlenecks,jams easily appear on the inner roundabout lane.To improve the capacity of the roundabout system,proper values of the enter probability α and the out probability β can be chosen. 相似文献
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