1,538 research outputs found
Quantitative validation of PEDFLOW for description of unidirectional pedestrian dynamics
The results of a systematic quantitative validation of PEDFLOW based on the
experimental data from FZJ are presented. Unidirectional flow experiments,
totaling 28 different combinations with varying entry, corridor and exit
widths, were considered. The condition imposed on PEDFLOW was that all the
cases should be run with the same input parameters. The exit times and
fundamental diagrams for the measuring region were evaluated and compared. This
validation process led to modifications and enhancements of the model
underlying PEDFLOW. The preliminary conclusions indicate that the results agree
well for densities smaller than 3 m-2 and a good agreement is observed even at
high densities for the corridors with bcor = 2.4 m, and bcor = 3.0 m. For
densities between 1 and 2 m-2 the specific flow and velocities are
underpredicted by PEDFLOW.Comment: 6 pages, 3 figures, 1 Table, conference PED201
Computation Speed of the F.A.S.T. Model
The F.A.S.T. model for microscopic simulation of pedestrians was formulated
with the idea of parallelizability and small computation times in general in
mind, but so far it was never demonstrated, if it can in fact be implemented
efficiently for execution on a multi-core or multi-CPU system. In this
contribution results are given on computation times for the F.A.S.T. model on
an eight-core PC.Comment: Accepted as contribution to "Traffic and Granular Flow 2009"
proceedings. This is a slightly extended versio
The Effect of Integrating Travel Time
This contribution demonstrates the potential gain for the quality of results
in a simulation of pedestrians when estimated remaining travel time is
considered as a determining factor for the movement of simulated pedestrians.
This is done twice: once for a force-based model and once for a cellular
automata-based model. The results show that for the (degree of realism of)
simulation results it is more relevant if estimated remaining travel time is
considered or not than which modeling technique is chosen -- here force-based
vs. cellular automata -- which normally is considered to be the most basic
choice of modeling approach.Comment: preprint of Pedestrian and Evacuation 2012 conference (PED2012)
contributio
Generalized Centrifugal Force Model for Pedestrian Dynamics
A spatially continuous force-based model for simulating pedestrian dynamics
is introduced which includes an elliptical volume exclusion of pedestrians. We
discuss the phenomena of oscillations and overlapping which occur for certain
choices of the forces. The main intention of this work is the quantitative
description of pedestrian movement in several geometries. Measurements of the
fundamental diagram in narrow and wide corridors are performed. The results of
the proposed model show good agreement with empirical data obtained in
controlled experiments.Comment: 10 pages, 14 figures, accepted for publication as a Regular Article
in Physical Review E. This version contains minor change
Experimental study of pedestrian flow through a T-junction
In this study, series of experiments under laboratory conditions were carried
out to investigate pedestrian flow through a T-junction, i.e., two branches
merging into the main stream. The whole duration of the experiments was
recorded by video cameras and the trajectories of each pedestrian were
extracted using the software Petrack from these videos. The Voronoi method is
used to resolve the fine structure of the fundamental diagram and spatial
dependence of the measured quantities from trajectories. In our study, only the
data in the stationary state are used by analyzing the time series of density
and velocity. The density, velocity and specific flow profiles are obtained by
refining the size of the measurement area (here 10 cm \times 10 cm are
adopted). With such a high resolution, the spatial distribution of density,
velocity and specific flow can be obtained separately and the regions with
higher value can be observed intuitively. Finally, the fundamental diagrams of
T-junction flow is compared in three different locations. It is shown that the
fundamental diagrams of the two branches match well. However, the velocities in
front of the merging are significantly lower than that in the main stream at
the same densities. After the merging, the specific flow increases with the
density \rho till 2.5 m-2. While in the branches, the specific flow is almost
independent of the density between \rho = 1.5 m-2 and 3.5 m-2Comment: 9 pages, 4 figures, 2 tables, TGF'1
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