scholarly journals A New Approach for Probabilistic Risk Assessment of Ship Collision with Riverside Bridges

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Wei Zhang ◽  
Shuoyu Liu ◽  
Wenwen Luo ◽  
Liping Wang ◽  
Bo Geng ◽  
...  
Keyword(s):  
Hazard Analysis ◽  
Probabilistic Method ◽  
Analysis Model ◽  
Collision Risk ◽  
New Approach ◽  
Probabilistic Distribution ◽  
Collapse Probability ◽  
Element Simulation ◽  
Ship Collision ◽  
Collision Force

The configuration of riverside bridges, such as the spatial distribution, wading status, and ship accessibility of piers, is generally different from river-crossing bridges. Thus, the ship collision risk of riverside bridges cannot be assessed using conventional assessment methods applicable to river-crossing bridges. The aim of this paper is, therefore, to develop a new probabilistic method for assessing the risk of ship collision with riverside bridges. First, a fully probabilistic framework for assessing the ship-bridge collision risk is presented. Second, a new probabilistic hazard analysis model of ship collision with riverside bridges is proposed, based on a combined study of riverside bridge characterization and an improved yaw ship collision model. A simplified empirical model for evaluating ship-bridge collision force is then adopted, and the probabilistic distribution of the collision force is obtained based on Monte Carlo simulation. Furthermore, finite element simulation is conducted to estimate the collapse probability of piers. Finally, the method developed is applied to the probabilistic assessment of ship collision risk with riverside bridges located at Shabin Road, Chongqing, China. The results show that the risk of ship-bridge collision at Shabin Road is low to moderate. The example demonstrated indicates that the methodology introduced in this paper is capable of assessing the ship-bridge collision risk in a concise and rapid way.

Specification and Design of Safety Functions for the Prevention of Ship-to-Ship Collisions on the High Seas

2018 ◽  
Vol 72 (1) ◽  
pp. 53-68 ◽  
Author(s):  
Reyes Poo Argüelles ◽  
Jesús A. García Maza ◽  
Felipe Mateos Martín
Keyword(s):  
Human Error ◽  
Functional Safety ◽  
Collision Risk ◽  
New Approach ◽  
Safety Standards ◽  
Severe Accidents ◽  
International Regulations ◽  
Ship Collision ◽  
Accident Statistics ◽  
High Seas

Maritime accident statistics reveal that ship collisions are among the most frequent and severe accidents. The same statistics indicate that most of them are caused by human error, mainly due to breaches of the International Regulations for Preventing Collisions at Sea (COLREGs) and to the lack of communication between ships. There are also special situations where there is some ambiguity in the application of the COLREGs. In such occasions, and if there is no communication between the ships involved, compliance with the Rules may still end up in a collision. This article brings a new approach to Collision Avoidance Systems (CAS) and presents the earliest stages in the development of safety functions for the reduction of ship-to-ship collision risk on the high seas. These functions will help the concerned ships achieve coordinated compliance with the COLREGs. Functional safety standards are applied and, in their implementation, real, accessible electronic programmable systems (hardware and software) will be used.

Transient Finite Element Simulation Analysis on Dolphin Structural under Ship Collision

2014 ◽  
Vol 638-640 ◽  
pp. 304-308
Author(s):  
Ying Ying Pan ◽  
Gui Lan Tao ◽  
Xiao Jing Fan
Keyword(s):  
Finite Element ◽  
Tensile Stress ◽  
Finite Element Simulation ◽  
Simulation Analysis ◽  
Back Surface ◽  
Transient Dynamic Analysis ◽  
Time Curve ◽  
Element Simulation ◽  
Ship Collision ◽  
Collision Force

Taking a certain dolphin structure of the ship lock in Jiangsu as an example, the finite analysis software ABAQUS was used to establish the 3D finite element model of ship, dolphin and foundation, and the process of collision was simulated for the transient dynamic analysis, obtained the collision force-time curve and the stress and strain of the dolphin, calculated ship collision force and compared with the norms used both in China and other countries. The results show that the maximum compressive stress is on the contact surface, the tensile stress is both on dolphin floor and back surface of the dolphin, and the maximum tensile stress is on the front teeth of dolphin floor; the ship collision force of finite element simulation is between Chinese norms and European norms. The results provide reference for the design of future dolphins.

scholarly journals An Estimation of Ship Collision Risk Based on Relevance Vector Machine

2021 ◽  
Vol 9 (5) ◽  
pp. 538
Author(s):  
Jinwan Park ◽  
Jung-Sik Jeong
Keyword(s):  
Machine Learning ◽  
Decision Making ◽  
Risk Estimation ◽  
Good Method ◽  
Relevance Vector Machine ◽  
Machine Learning Algorithms ◽  
Support Vector ◽  
Collision Risk ◽  
Estimation Model ◽  
Ship Collision

According to the statistics of maritime collision accidents over the last five years (2016–2020), 95% of the total maritime collision accidents are caused by human factors. Machine learning algorithms are an emerging approach in judging the risk of collision among vessels and supporting reliable decision-making prior to any behaviors for collision avoidance. As the result, it can be a good method to reduce errors caused by navigators’ carelessness. This article aims to propose an enhanced machine learning method to estimate ship collision risk and to support more reliable decision-making for ship collision risk. In order to estimate the ship collision risk, the conventional support vector machine (SVM) was applied. Regardless of the advantage of the SVM to resolve the uncertainty problem by using the collected ships’ parameters, it has inherent weak points. In this study, the relevance vector machine (RVM), which can present reliable probabilistic results based on Bayesian theory, was applied to estimate the collision risk. The proposed method was compared with the results of applying the SVM. It showed that the estimation model using RVM is more accurate and efficient than the model using SVM. We expect to support the reasonable decision-making of the navigator through more accurate risk estimation, thus allowing early evasive actions.

scholarly journals Improving Near Miss Detection in Maritime Traffic in the Northern Baltic Sea from AIS Data

2021 ◽  
Vol 9 (2) ◽  
pp. 180
Author(s):  
Lei Du ◽  
Osiris A. Valdez Banda ◽  
Floris Goerlandt ◽  
Pentti Kujala ◽  
Weibin Zhang
Keyword(s):  
Baltic Sea ◽  
Perceived Risk ◽  
Maritime Transportation ◽  
Near Miss ◽  
Automatic Identification ◽  
Identification System ◽  
Collision Risk ◽  
Ship Collision ◽  
The Impact ◽  
Ship Behavior

Ship collision is the most common type of accident in the Northern Baltic Sea, posing a risk to the safety of maritime transportation. Near miss detection from automatic identification system (AIS) data provides insight into maritime transportation safety. Collision risk always triggers a ship to maneuver for safe passing. Some frenetic rudder actions occur at the last moment before ship collision. However, the relationship between ship behavior and collision risk is not fully clarified. Therefore, this work proposes a novel method to improve near miss detection by analyzing ship behavior characteristic during the encounter process. The impact from the ship attributes (including ship size, type, and maneuverability), perceived risk of a navigator, traffic complexity, and traffic rule are considered to obtain insights into the ship behavior. The risk severity of the detected near miss is further quantified into four levels. This proposed method is then applied to traffic data from the Northern Baltic Sea. The promising results of near miss detection and the model validity test suggest that this work contributes to the development of preventive measures in maritime management to enhance to navigational safety, such as setting a precautionary area in the hotspot areas. Several advantages and limitations of the presented method for near miss detection are discussed.

Identifying nursing hazards in the emergency department: A new approach to nursing job hazard analysis

2006 ◽  
Vol 37 (1) ◽  
pp. 63-74 ◽  
Author(s):  
Jim Ramsay ◽  
Frank Denny ◽  
Kara Szirotnyak ◽  
Jonathan Thomas ◽  
Elizabeth Corneliuson ◽  
...  
Keyword(s):  
Emergency Department ◽  
Hazard Analysis ◽  
New Approach

Midsurface Abstraction From 3D Solid Models for Engineering Analysis

1996 ◽  
Author(s):  
Mohsen Rezayat
Keyword(s):  
Feature Recognition ◽  
Analysis Model ◽  
Thin Sections ◽  
New Approach ◽  
Solid Models ◽  
Product And Process ◽  
Plastic Parts ◽  
3D Solid ◽  
User Friendly ◽  
Analysis Models

Abstract An integral part of implementing parallel product and process designs is simulation through numerical analysis. This simulation-driven design requires discretization of the 3D part in an appropriate manner. If the part is thin or has thin sections (e.g., plastic parts), then an analysis model with reduced dimensionality may be more accurate and economical than a standard 3D model. In addition, substantial simplification of some details in the design geometry may be beneficial and desirable in the analysis model. Unfortunately, the majority of CAD systems do not provide the means for abstraction of appropriate analysis models. In this paper we present a new approach, based on midsurface abstraction, which holds significant promise in simplifying simulation-driven design. The method is user-friendly because very little interaction is required to guide the software in its automatic creation of the desired analysis model. It is also robust because it handles typical parts with complex and interacting features. Application of the method for feature recognition and abstraction is also briefly discussed.

scholarly journals Effect of Stress Wave between Adjacent Asperities Interaction on Subsurface Damage of Optical Glass in Precision Grinding

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1239
Author(s):  
Chen ◽  
Ren ◽  
Lin
Keyword(s):  
Finite Element ◽  
Optical Glass ◽  
Diamond Particle ◽  
Subsurface Damage ◽  
Propagation Mechanism ◽  
Analysis Model ◽  
Precision Grinding ◽  
Element Analysis ◽  
Analysis Process ◽  
Element Simulation

The interaction between adjacent asperities is a typical characteristic of the grinding process and plays an important role in the material removal mechanism. Therefore, in order to systematically investigate the formation mechanism of the subsurface damage, a precision grinding contact model between the diamond particle and optical glass with adjacent asperities is proposed in our research. The initiation and propagation mechanism of median/lateral cracks under residual stress, the propagation rules of the stress waves on the subsurface, and the interaction between the subsurface damage under stress superposition effect are fully investigated by a theoretical analysis and finite element simulation. The simulation results of the precision grinding model are verified by experiments, which show that the proposed numerical analysis model is reasonable and the finite element analysis process is feasible.

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