Pedestrians rotation measurement in bidirectional streams
This study presents an experimental measurement of pedestrians body rotation in bidirectional streams.A mock-up corridor monitored using a camera placed on azimuthal position is used to study pedestrians behavior in unidirectional and bidirectional flows.Additionally, a commercial tablet is fixed on the chest of sample pedestrians to examine their body rotation (or yawing) which cannot be obtained using position tracking alone.Angular velocity is recorded and simultaneously stored in a central location using a wireless network, thus allowing the analysis of body movements with a high sampling rate and a limited delay.To investigate the influence of major/ minor flow proportion (flow-ratio) on bidirectional streams two different situations were tested: the balanced configuration (with equal flows in both directions) and an unbalanced configuration (with different major and minor flow).Results clearly show that unidirectional flow is more stable compared to the bidirectional case, requiring less time to cross the experimental section and showing a very small amount of rotation during the whole experiment.Both bidirectional configurations showed high values of body rotation, in particular during lane formation and dissolution.Finally, rotation directly measured on pedestrians body was compared with the one obtained indirectly by analyzing pedestrians trajectories.The comparison shows that, at least from a qualitative point of view, both methods are in agreement, thus suggesting that even properties which can only be measured by motion sensing could be obtained indirectly through the analysis of trajectories.Concluding, it has been suggested that while lanes help smooth out bidirectional flows, larger instabilities are observed compared to the unidirectional case.Lane separation and/or appropriate guidance are therefore required.In this regard, the development of a dynamically changing guidance system is a scientific and technical challenge on which further research could be addressed.
bidirectional flow counter flow body rotation lane formation tablet gyroscope
Claudio Feliciani Katsuhiro Nishinari
Department of Advanced Interdisciplinary Studies, Graduate School of Engineering, The University of Department of Aeronautics and Astronautics, Graduate School of Engineering, The University of Tokyo,
国际会议
The 8th International Conference on Pedestrian and Evacuation Dynamics (第八届行人与疏散动力学国际学术会议)
合肥
英文
76-83
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）