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Dispersion and multi-mode occurred when Lamb wave propagate in the lamina, the reflection principle of Lamb wave is complicated while it encounter defects. For diverse defects, different modes have different sensitivities. The theoretical of displacement and stress wave structure are analyzed. The dispersion curve and wave structure curve are presented. Piezoelectric (PZT) ceramic wafers are applied...
In order to research the characteristics of traffic flow with fixed-time scheme at the T-shaped intersection, a cellular automata model is proposed to simulate the intersection with all directional vehicles. The rules are applied to avoid the conflicts between different directional vehicles. Simulation results show that the flux will increase with green time but it has the upper limit. The average...
The slow-to-start rule is usually adopted in cellular automaton traffic flow model. And it is deemed as the mechanism for metastable states and hysteresis effect. In this paper, we explore the slow-to-start behavior by analyzing the vehicle trajectory data provided by the Next Generation Simulation program. Then the slow-to-start rule is verified in several cellular automaton traffic flow models....
This paper investigates the pedestrian evacuation dynamics considering the pedestrians' exit choice behavior with the influence of fire spreading. Two strategies are proposed: creating an extended floor field model, adjusting the value of static floor field to balance the number of pedestrians attached to each exit. In the new extended Floor Field model, the effect of the exit choice behavior on the...
Since synchronized flow is observed in the real traffic, its mechanism has been investigated in a great deal of traffic models. Various mechanisms have been proposed to explain synchronized flow. In this paper, we proposed a new mechanism, i.e. speed variation dependent randomization. Based on this mechanism, a new cellular automata model is built. The fundamental diagram and spatiotemporal diagrams...
In this paper, the influence of cell size on the dynamics of traffic flow at an on-ramp is investigated by using cellular automata model. The two common methods, i.e., with or without ramp lane, for modeling the on-ramp system are both adopted. The phase diagram and the capacity of the on-ramp system are studied in detail. Capacity drop is a common phenomenon at traffic bottlenecks, especially at...
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