Centrifugal force model for pedestrian dynamics

2005 ◽  
Vol 72 (2) ◽  
Author(s):  
W. J. Yu ◽  
R. Chen ◽  
L. Y. Dong ◽  
S. Q. Dai
Keyword(s):  
Centrifugal Force ◽  
Force Model ◽  
Pedestrian Dynamics

scholarly journals Generalized centrifugal-force model for pedestrian dynamics

2010 ◽  
Vol 82 (4) ◽  
Author(s):  
Mohcine Chraibi ◽  
Armin Seyfried ◽  
Andreas Schadschneider
Keyword(s):  
Centrifugal Force ◽  
Force Model ◽  
Pedestrian Dynamics

scholarly journals Simulation of Evacuation Characteristics Using a 2-Dimensional Cellular Automata Model for Pedestrian Dynamics

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Liqiang Ji ◽  
Yongsheng Qian ◽  
Junwei Zeng ◽  
Min Wang ◽  
Dejie Xu ◽  
...  
Keyword(s):  
Cellular Automata ◽  
High Density ◽  
Force Model ◽  
Environment Interaction ◽  
Social Force ◽  
Public Places ◽  
Pedestrian Dynamics ◽  
Repulsion Force ◽  
The People ◽  
Ca Model

In public places, the high pedestrian density is one of the direct causes leading to crowding and trample disaster, so it is very necessary to investigate the collective and evacuation characteristics for pedestrian movement. In the occupants’ evacuation process, the people-people interaction and the people-environment interaction are sufficiently considered in this paper, which have been divided into the exit attraction, the repulsion force between people, the friction between people, the repulsion force between human and barrier, and the attraction of surrounding people. Through analyzing the existing models, a new occupant evacuation cellular automata (CA) model based on the social force model is presented, which overcomes the shortage of the high density crowd simulation and combines the advantages that CA has sample rules and faster calculating speed. The simulating result shows a great applicability for evacuation under the high density crowd condition, and the segregation phenomena have also been found in the bidirectional pedestrian flow. Besides these, setting isolated belt near the exit or entrance of underpass not only remarkably decreases the density and the risk of tramper disaster but also increases the evacuation efficiency, so it provides a new idea for infrastructure design about the exits and entrances.

Forced Response Prediction of Blades With Loosely Assembled Dovetail Attachment by HBM

2009 ◽  
Author(s):  
Shangguan Bo ◽  
Zili Xu ◽  
Qilin Wu ◽  
XianDing Zhou ◽  
ShouHong Cao
Keyword(s):  
Friction Force ◽  
Centrifugal Force ◽  
Dry Friction ◽  
Harmonic Balance ◽  
Harmonic Balance Method ◽  
Forced Response ◽  
Balance Method ◽  
Force Model ◽  
Equivalent Stiffness ◽  
Equivalent Damping

To understand the mechanism of interfacial damping of axial loosely assembled dovetail to suppress blade vibration, a dry friction force model is presented by the Coulomb friction law and the macroslip model, and the mathematical expression of the friction force is derived. The nonlinear friction force is linearized as an equivalent stiffness and an equivalent damping through the one-term harmonic balance method. The effect of centrifugal force on the equivalent stiffness and the equivalent damping is studied. The forced response of one simplified blade with loosely assembled dovetail attachment is predicted by the harmonic balance method, in which the blade is described by the lumped mass and spring model, and the friction contact joints is simplified as a ideal friction damper. The results show that the equivalent stiffness of loosely assembled dovetail attachment increases with blade centrifugal force, gradually reaches a certain value, and there exists the maximum value for the equivalent stiffness. The equivalent damping increases at the beginning and then decreases with blade centrifugal force increasing, there exists a maximum too. The resonant frequency of blade rises with blade centrifugal force, but it no longer increases when the centrifugal force exceed a certain value. There exists a special centrifugal force on which the effect of dry friction damping is the best.

scholarly journals Disease contagion models coupled to crowd motion and mesh-free simulation

2021 ◽  
pp. 1-19
Author(s):  
Parveena Shamim Abdul Salam ◽  
Wolfgang Bock ◽  
Axel Klar ◽  
Sudarshan Tiwari
Keyword(s):  
Free Particle ◽  
Numerical Test ◽  
Particle Method ◽  
Coupled System ◽  
Disease Spread ◽  
Force Model ◽  
Social Force ◽  
Pedestrian Dynamics ◽  
Mesh Free ◽  
Crowd Motion

Modeling and simulation of disease spreading in pedestrian crowds have recently become a topic of increasing relevance. In this paper, we consider the influence of the crowd motion in a complex dynamical environment on the course of infection of the pedestrians. To model the pedestrian dynamics, we consider a kinetic equation for multi-group pedestrian flow based on a social force model coupled with an Eikonal equation. This model is coupled with a non-local SEIS contagion model for disease spread, where besides the description of local contacts, the influence of contact times has also been modeled. Hydrodynamic approximations of the coupled system are derived. Finally, simulations of the hydrodynamic model are carried out using a mesh-free particle method. Different numerical test cases are investigated, including uni- and bi-directional flow in a passage with and without obstacles.

scholarly journals QUICKEST PATHS IN SIMULATIONS OF PEDESTRIANS

2011 ◽  
Vol 14 (05) ◽  
pp. 733-759 ◽  
Author(s):  
TOBIAS KRETZ ◽  
ANDREE GROßE ◽  
STEFAN HENGST ◽  
LUKAS KAUTZSCH ◽  
ANDREJ POHLMANN ◽  
...  
Keyword(s):  
Travel Time ◽  
Personal Space ◽  
Path Model ◽  
Force Model ◽  
Social Force ◽  
Microscopic Simulation ◽  
Pedestrian Dynamics ◽  
The Social ◽  
Model Element ◽  
Pedestrian Traffic

This contribution proposes a method to make agents in a microscopic simulation of pedestrian traffic walk approximately along a path of estimated minimal remaining travel time to their destination. Usually models of pedestrian dynamics are (implicitly) built on the assumption that pedestrians walk along the shortest path. Model elements formulated to make pedestrians locally avoid collisions and intrusion into personal space do not produce motion on quickest paths. Therefore a special model element is needed, if one wants to model and simulate pedestrians for whom travel time matters most (e.g. travelers in a station hall who are late for a train). Here such a model element is proposed, discussed and used within the Social Force Model.

scholarly journals Some Indications on How to Calibrate the Social Force Model of Pedestrian Dynamics

2018 ◽  
Vol 2672 (20) ◽  
pp. 228-238 ◽  
Author(s):  
Tobias Kretz ◽  
Jochen Lohmiller ◽  
Peter Sukennik
Keyword(s):  
Maximum Density ◽  
Force Model ◽  
Clearance Time ◽  
Social Force ◽  
Social Force Model ◽  
Pedestrian Dynamics ◽  
Walking Behavior ◽  
Calibration Process ◽  
Relevant Result ◽  
The Social

The social force model of pedestrian dynamics is formulated in such a way that (a) most of its parameters do not have an immediate interpretation in the sense that they cannot be measured directly, (b) often one single parameter has an impact on many aspects of walking behavior, and (c) a certain aspect of walking behavior results from the values of more than one parameter. This makes calibration difficult. The aim of this paper is to give practitioners an indication of how to proceed in the calibration process. For this purpose, by analytical transformations the parameters of the social force model are related to real properties that have a clear and immediate meaning and are also highly relevant result properties of a simulation: extent and clearance time of a queue, respectively maximum density, and capacity flow. The theory for this is presented, and thus this study offers a deeper understanding of the model including its theoretical aspects.

scholarly journals 3D Indoor Environment Abstraction for Crowd Simulations in Complex Buildings

Buildings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 445
Author(s):  
Mitko Aleksandrov ◽  
David J. Heslop ◽  
Sisi Zlatanova
Keyword(s):  
Physical Structure ◽  
Force Model ◽  
Built Environments ◽  
Social Force ◽  
Pedestrian Dynamics ◽  
Building Model ◽  
Automatic Abstraction ◽  
Crowd Simulations ◽  
Building Information ◽  
Pedestrian Simulation

This paper presents an approach for the automatic abstraction of built environments needed for pedestrian dynamics from any building configuration. The approach assesses the usability of navigation mesh to perform realistically pedestrian simulation considering the physical structure and pedestrian abilities for it. Several steps are examined including the creation of a navigation mesh, space subdivision, border extraction, height map identification, stairs classification and parametrisation, as well as pedestrian simulation. A social-force model is utilised to simulate the interactions between pedestrians and an environment. To perform quickly different 2D/3D geometrical queries various spatial indexing techniques are used, allowing fast identification of navigable spaces and proximity checks related to avoidance of people and obstacles in built environments. For example, for a moderate size building having eight floors and a net area of 13,000 m2, it takes only 104 s to extract the required building information to run a simulation. This approach can be used for any building configuration extracting automatically needed features to run pedestrian simulations. In this way, architects, urban planners, fire safety engineers, transport modellers and many other users without the need to manually interact with a building model can perform immediately crowd simulations.

scholarly journals Social force model for pedestrian dynamics

1995 ◽  
Vol 51 (5) ◽  
pp. 4282-4286 ◽  
Author(s):  
Dirk Helbing ◽  
Péter Molnár
Keyword(s):  
Force Model ◽  
Social Force ◽  
Social Force Model ◽  
Pedestrian Dynamics
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