In this study, we develop a mixed reality game system to investigate characteristics ofjudgrnents of individual players in an evacuation process. The characteristics of judgments of the players that are inferred from ...In this study, we develop a mixed reality game system to investigate characteristics ofjudgrnents of individual players in an evacuation process. The characteristics of judgments of the players that are inferred from the performance of the game are then incorporated into a multi-agent simulation as rules. The behavior of evacuees is evaluated in approximations of real situations, by using the agent simulation including different judgments of evacuees. Using the results of the simulation, effective methods are discussed for achieving the escape of the evacuees within a short time.展开更多
Pedestrian behavior modeling plays a considerably important role in improving operational efficiency and safety of pedestrian infrastructure.In this paper,we first propose a cost potential field cellular automata mode...Pedestrian behavior modeling plays a considerably important role in improving operational efficiency and safety of pedestrian infrastructure.In this paper,we first propose a cost potential field cellular automata model that simulates crowd evacuation dynamics on a ramp with two exits.In the model,each pedestrian navigates according to the cost potential field in the ramp domain.Evacuation behaviors of pedestrians are investigated with respect to the ramp angle and the layout of the exits.An aggregated pushing force field is introduced to capture the effects of pushing interactions among pedestrians under congested situations.The phenomenon of pedestrians’falling down is modeled and demonstrated under various scenarios with different exit layouts and ramp angles.Numerical results show that an optimal layout strategy is to set the two exits in the center of the bottom and the top of the ramp,respectively.This typical exit layout design could effectively prevent and/or reduce crowd injury caused by the domino effect of pedestrians falling down in a stampede.展开更多
In this article, the low pressure axial flow fan with circumferential skewed rotor blade, including the radial blade, the forward-skewed blade and the backward-skewed blade, was studied with experimental methods. The ...In this article, the low pressure axial flow fan with circumferential skewed rotor blade, including the radial blade, the forward-skewed blade and the backward-skewed blade, was studied with experimental methods. The aerodynamic performance of the rotors was measured. At the design condition at outlet of the rotors, detailed flow measurements were performed with a five-hole probe and a Hot-Wire Anemometer （HWA）. The results show that compared to the radial rotor, the forward-skewed rotor demonstrates a wider Stable Operating Range （SOR）, is able to reduce the total pressure loss in the hub region and make main loading of blade accumulating in the mid-span region. There is a wider wake in the upper mid-span region of the forward-skewed rotor. Compared to the radial rotor, in the backward-skewed rotor there is higher total pressure loss near the hub and shroud regions and lower loss in the mid-span region. In addition, the velocity deficit in the wake is lower at mid-span of the backward-skewed rotor than the forward-skewed rotor.展开更多
文摘In this study, we develop a mixed reality game system to investigate characteristics ofjudgrnents of individual players in an evacuation process. The characteristics of judgments of the players that are inferred from the performance of the game are then incorporated into a multi-agent simulation as rules. The behavior of evacuees is evaluated in approximations of real situations, by using the agent simulation including different judgments of evacuees. Using the results of the simulation, effective methods are discussed for achieving the escape of the evacuees within a short time.
基金supported by the research grants from National Natural Science Foundation of China(Grant Nos.71531011,71401126,71771153,71601142)Shanghai Shuguang Program(#13SG23),Program for Fostering of Shanghai Young Teachers in Higher Education Institution(ZZZZyyx16016)+1 种基金Introduction of Talent Research Stand-up Fund of Shanghai Institute of Technology(YJ2016-26)the research grants from the China Postdoctoral Science Foundation(Grant No.2014M551460,and No.2015T80457).
文摘Pedestrian behavior modeling plays a considerably important role in improving operational efficiency and safety of pedestrian infrastructure.In this paper,we first propose a cost potential field cellular automata model that simulates crowd evacuation dynamics on a ramp with two exits.In the model,each pedestrian navigates according to the cost potential field in the ramp domain.Evacuation behaviors of pedestrians are investigated with respect to the ramp angle and the layout of the exits.An aggregated pushing force field is introduced to capture the effects of pushing interactions among pedestrians under congested situations.The phenomenon of pedestrians’falling down is modeled and demonstrated under various scenarios with different exit layouts and ramp angles.Numerical results show that an optimal layout strategy is to set the two exits in the center of the bottom and the top of the ramp,respectively.This typical exit layout design could effectively prevent and/or reduce crowd injury caused by the domino effect of pedestrians falling down in a stampede.
基金supported by the National Natural Science Foundation of China (Grant No.50406017).
文摘In this article, the low pressure axial flow fan with circumferential skewed rotor blade, including the radial blade, the forward-skewed blade and the backward-skewed blade, was studied with experimental methods. The aerodynamic performance of the rotors was measured. At the design condition at outlet of the rotors, detailed flow measurements were performed with a five-hole probe and a Hot-Wire Anemometer （HWA）. The results show that compared to the radial rotor, the forward-skewed rotor demonstrates a wider Stable Operating Range （SOR）, is able to reduce the total pressure loss in the hub region and make main loading of blade accumulating in the mid-span region. There is a wider wake in the upper mid-span region of the forward-skewed rotor. Compared to the radial rotor, in the backward-skewed rotor there is higher total pressure loss near the hub and shroud regions and lower loss in the mid-span region. In addition, the velocity deficit in the wake is lower at mid-span of the backward-skewed rotor than the forward-skewed rotor.
