scholarly journals Experimental study on individual walking speed during emergency evacuation with the influence of ship motion

2021 ◽  
Vol 562 ◽  
pp. 125369
Author(s):  
Xinjian Wang ◽  
Zhengjiang Liu ◽  
Jin Wang ◽  
Sean Loughney ◽  
Zaili Yang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Walking Speed ◽  
Emergency Evacuation ◽  
Ship Motion

SHIP MOTIONS DURING REPLENISHMENT AT SEA OPERATIONS IN HEAD SEAS

2021 ◽  
Vol 152 (A4) ◽  
Author(s):  
G Thomas ◽  
T Turner ◽  
T Andrewartha ◽  
B Morris
Keyword(s):  
Experimental Study ◽  
Green Function ◽  
Prediction Method ◽  
Ship Motion ◽  
Motion Prediction ◽  
Ship Motions ◽  
Forward Speed ◽  
Theoretical Predictions ◽  
Relative Separation ◽  
Replenishment At Sea

During replenishment at sea operations the interaction between the two vessels travelling side by side can cause significant motions in the smaller vessel and affect the relative separation between their replenishment points. A study into these motions has been conducted including theoretical predictions and model experiments. The model tests investigated the influence of supply ship displacement and longitudinal separation on the ships’ motions. The data obtained from the experimental study has been used to validate a theoretical ship motion prediction method based on a 3-D zero-speed Green function with a forward speed correction in the frequency domain. The results were also used to estimate the expected extreme roll angle of the receiving vessel, and the relative motion between the vessels, during replenishment at sea operations in a typical irregular seaway. A significant increase in the frigate’s roll response was found to occur with an increase of the supply ship displacement, whilst a reduction in motion for the receiving vessel resulted from an increase in longitudinal separation between the vessels. It is proposed that to determine the optimal vessel separation it is vital that the motions of the vessels are not considered in isolation and all motions need to be considered for both vessels simultaneously.

An experimental study on individual walking speed during ship evacuation with the combined effect of heeling and trim

2018 ◽  
Vol 166 ◽  
pp. 396-403 ◽  
Author(s):  
Jinlu Sun ◽  
Yafei Guo ◽  
Changhai Li ◽  
Siuming Lo ◽  
Shouxiang Lu
Keyword(s):  
Experimental Study ◽  
Walking Speed ◽  
Combined Effect

Walking speed reduction rates at intersections while wayfinding indoors: An experimental study

2020 ◽  
Author(s):  
Young‐Hoon Bae ◽  
Young‐Chan Kim ◽  
Ryun‐Seok Oh ◽  
Jong‐Yeong Son ◽  
Won‐Hwa Hong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Walking Speed ◽  
Speed Reduction

scholarly journals Emergency evacuation simulation of commercial aircraft

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Andreas Gobbin ◽  
Raman Khosravi ◽  
Andreas Bardenhagen
Keyword(s):  
Walking Speed ◽  
Emergency Evacuation ◽  
Simulation Software ◽  
Commercial Aircraft ◽  
Agent Based Simulation ◽  
Body Dimension ◽  
Evacuation Simulation ◽  
Agent Based ◽  
Collision Response ◽  
To Receive

AbstractIn order to receive certification approval for new products, aircraft manufacturers have to comply with the specifications regarding cabin evacuation. In case of real evacuation trials, agent-based simulation can be deployed, as they are a less cost-intensive mean of analysing passenger behaviour during the evacuation of commercial aircraft. This paper aims at examining the suitability of agent-based simulation software to reproduce passenger behaviour during evacuation processes. For this purpose, the algorithms and methods of the software PATHFINDER are introduced. Besides, the cabin of a single aisle aircraft is reconstructed in a high-density configuration using software-specific tools. A representative passenger distribution is implemented according to EASA regulations. Evacuation simulations for a single-aisle aircraft are conducted taking EASA standards into account. The effect of vital parameters such as walking speed, body dimension, conflict behaviour, collision response, acceleration time and exit allocation on evacuation times are examined. Results are discussed and examined for plausibility in order to determine whether evacuation simulations of commercial aircraft are possible using agent-based simulation software.

Experimental Study on Seakeeping Performance of a Catamaran with Asymmetric Demi-Hulls

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
S. Ikezoe ◽  
N. Hirata ◽  
H. Yasukawa
Keyword(s):  
Experimental Study ◽  
Ship Motion ◽  
Added Resistance ◽  
Scaled Model ◽  
Seakeeping Performance ◽  
Head Waves ◽  
Lateral Space ◽  
Design Speed ◽  
Resistance Performance ◽  
Regular Head Waves

To capture the seakeeping performance of a catamaran with asymmetric demi-hulls, tank tests were carried out in regular head waves using a scaled model with 2.036 m in length. The lateral space between the demi-hulls was changed in the tests as W/B=2.55, 2.90 and 3.25, where W denotes breadth overall and B the breadth of the demi-hull. Also, two models with different water lines of inside flat and outside round (IF-type) and of outside flat and inside round (OF-type) were used. OF-type is superior to IF-type in both ship motion and added resistance performances in waves at the design speed. In IF-type series, the smallest clearance, W/B=2.55 is the best in the added resistance performance.

scholarly journals A kinetic theory approach for 2D crowd dynamics with emotional contagion

2021 ◽  
pp. 1-26
Author(s):  
Daewa Kim ◽  
Kaylie O’Connell ◽  
William Ott ◽  
Annalisa Quaini
Keyword(s):  
Experimental Study ◽  
Kinetic Theory ◽  
Computational Modeling ◽  
Walking Speed ◽  
Operator Splitting ◽  
Emotional Contagion ◽  
Theory Approach ◽  
Splitting Scheme ◽  
Active Particles ◽  
Fear Level

In this paper, we present a computational modeling approach for the dynamics of human crowds, where the spreading of an emotion (specifically fear) has an influence on the pedestrians’ behavior. Our approach is based on the methods of the kinetic theory of active particles. The model allows us to weight between two competing behaviors depending on fear level: the search for less congested areas and the tendency to follow the stream unconsciously (herding). The fear level of each pedestrian influences their walking speed and is influenced by the fear levels of their neighbors. Numerically, we solve our pedestrian model with emotional contagion using an operator splitting scheme. We simulate evacuation scenarios involving two groups of interacting pedestrians to assess how domain geometry and the details of fear propagation impact evacuation dynamics. Further, we reproduce the evacuation dynamics of an experimental study involving distressed ants.

scholarly journals Simulation of Passenger Evacuation Process in Cruise Ships Based on A Multi-Grid Model

Symmetry ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1166 ◽  
Author(s):  
Min Hu ◽  
Wei Cai ◽  
Haiou Zhao
Keyword(s):  
Walking Speed ◽  
Emergency Evacuation ◽  
Cruise Ship ◽  
Evacuation Time ◽  
Grid Model ◽  
Cruise Ships ◽  
Evacuation Plans ◽  
Simulation Results ◽  
Space Layout ◽  
The Relationship

The evacuation of the cruise ship is directly related to the safety of passengers during accidents. The method for avoiding and reducing casualties in accidents has become a research frontier of maritime safety. This paper presents the simulation of a passenger evacuation process using a multi-grid model. In the model, directions of passengers’ movement are extended and the relationship between passengers’ orientation and the walking speed under the inclining condition is also analyzed in detail. Considering the space layout, the attraction of the mainstream crowd and exclusion between individuals, the probability of passengers’ transfer between grids is established. The deck of the cruise ship is taken as the evacuation scenario and four parameters are defined for the scenario according to International Maritime Organization (IMO) guidelines. The process of evacuation in the cruise ship is simulated under upright and inclining conditions. Through the analysis of simulation results, evacuation bottleneck data and the relation between inclined angles and evacuation time are obtained. This work may provide a reference for formulating emergency evacuation plans for cruise ships.

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