scholarly journals Recent Advances in Damage Stability Assessment with Application on a Container Vessel

2018 ◽  
Vol 2 (Special edition 2) ◽  
pp. 167-184
Author(s):  
Boris Tomić ◽  
Anton Turk ◽  
Bruno Čalić
Keyword(s):  
Recent Work ◽  
Safety Assessment ◽  
Design Procedure ◽  
Computer Programs ◽  
Assessment Criteria ◽  
Container Ship ◽  
Stability Assessment ◽  
Damage Scenarios ◽  
Damage Stability ◽  
Damage Condition

The paper reviews the design procedure and recent work published on the topic of the damage stability and the safety assessment criteria that is established accordingly. The available damage scenarios must be designed prior to the safety assessment of a damaged ship. Another aspect of the discussions is an opinion on some problematic aspects of the damage stability regulations with practical aspects presented in literature very sparse and the fact that different computer programs may give divers outcomes. A little review on the damage stability requirements with its new regulations is given. Stability assessment is performed on a selected container ship using the Maxsurf software for both the intact and damage condition of the vessel, while the parameters related to damage stability are identified and categorized when developing deterministic and probabilistic damage scenarios.

scholarly journals Foran Application on Damage Stability Assessment on a Container Vessel

2020 ◽  
Vol 3 (3) ◽  
pp. 227-238
Author(s):  
TOmislav Staničić ◽  
Mirko Toman Fernandez ◽  
Anton Turk ◽  
Damir Kolić
Keyword(s):  
Safety Assessment ◽  
Probability Distributions ◽  
Design Procedure ◽  
Container Ship ◽  
Stability Assessment ◽  
Training Process ◽  
Damage Stability ◽  
Technical Details ◽  
Automated Simulation ◽  
And Training

The paper focuses on two aspects. One is SENER incentives to work with the educational community by providing the FORAN software as a collaboration mean that centres on helping to develop the FORAN system, and the other way around the use of the FORAN system for academic purposes in universities, to improve and complement the teaching and training process for students. The second part of the paper focuses more on a technical details on the design procedure for the damage stability and the safety assessment criteria that is established accordingly. Stability assessment is performed using the FORAN software, with the creation of explicit damage events by a fully automated simulation, established from the uniformly distributed random numbers with given probability distributions for size and position of damage and an example on a container ship presented.

scholarly journals Damaged warship stability tests based on ANEP-77: A case study for F-110

2017 ◽  
Vol 10 (20) ◽  
pp. 19
Author(s):  
José M. Riola ◽  
Rodrigo Pérez ◽  
Borja Rodríguez
Keyword(s):  
Environmental Conditions ◽  
Safety Assessment ◽  
Royal Navy ◽  
Stability Tests ◽  
Damage Scenarios ◽  
Damage Stability ◽  
Naval Ship ◽  
Safety Assessments ◽  
Core Part

Stability tests are a core part of a hydrodynamics warship design. The acquired knowledge from the hydrodynamics model basin will affect her lifespan. Particularly, a safety assessment of damaged ships, which considers environmental conditions such as waves and wind, is critical in future operations. Over the last decade, a significant amount of experience has been gained associated with predicting the capsize behavior of intact and damaged naval vessels, and the main objective of this paper is to provide insights into different relevant physical aspects to prevent the capsizing of damaged ships in waves following the Naval Ship Code (NSC) or ANEP-77 rules. Currently, the Royal Navy of Spain is developing the future F-110 frigate class and carried out model tests at Canal de Experiencias Hidrodinámicas de El Pardo (CEHIPAR) for optimizing the forms of body hulls. Among these dynamic experiences, the most critical are the damage stability tests. Although a safety criteria of damaged ships that considers environmental conditions such as waves and wind has not yet been developed, NATO and the European maritime classification societies have developed guidelines for safety assessments such as the ANEP-77. This code contains damage scenarios and environmental conditions. 

Effects of Break Location and Time Uncertainties in Small-Break and Medium-Break LOCA Sequences With Unavailability of HPSI

2013 ◽  
Author(s):  
J. Gonzalez-Cadelo ◽  
C. Queral ◽  
J. Montero-Mayorga
Keyword(s):  
Safety Assessment ◽  
Regulatory Body ◽  
Uncertain Parameters ◽  
Hydraulic Analysis ◽  
Probabilistic Safety Assessment ◽  
Starting Time ◽  
Lower Head ◽  
Damage Condition ◽  
Thermal Hydraulic Analysis ◽  
Secondary Side

The Integrated Safety Assessment (ISA) methodology, developed by the Spanish Nuclear Regulatory Body, consists of a dynamic methodology of probabilistic safety assessment. It has been applied to a thermal-hydraulic analysis of small-break and medium-break LOCA sequences without HPSI, for different break locations, in a three-loop PWR. ISA methodology allows to obtain the damage domain, defined as the region of the space of uncertain parameters where the damage condition is exceeded, for each sequence of interest. In this work, damage domain relates two uncertain parameters (starting time of secondary-side depressurization and break size) to damage exceedance condition (PCT > 1477 K). Several damage domains have been obtained, each one for each break location of interest (cold leg, hot leg, vessel upper head and vessel lower head). Simulations have been performed with TRACE v5.0 patch 1 code, and the results show the capability and convenience of ISA methodology, in order to obtain accurate results that take into account time uncertainties.

SESSION 3A: SHIPBOARD DAMAGE STABILITY ASSESSMENT: FLOODING CASUALTY CONTROL SOFTWARE

1993 ◽  
Vol 105 (4) ◽  
pp. 114-114
Author(s):  
E. Henn ◽  
James W. Meyer ◽  
Peter B. Zahn ◽  
John Rosborough ◽  
Richard Carlstrom
Keyword(s):  
Stability Assessment ◽  
Control Software ◽  
Damage Stability

COLLATING EVIDENCE FOR A UNIVERSAL METHOD OF STABILITY ASSESSMENT OR GUIDANCE

2021 ◽  
Vol 152 (A2) ◽  
Author(s):  
B Deakin
Keyword(s):  
Safety Assessment ◽  
Universal Method ◽  
Stability Assessment ◽  
Research Project ◽  
Simple Method ◽  
Subsequent Research ◽  
Further Development

This paper reviews two related projects conducted for the Maritime and Coastguard Agency, and collates their findings with additional casualty data, in an attempt to promote a simple method of safety assessment. The method was developed by the author during research conducted for the Maritime and Coastguard Agency. It was evaluated in a subsequent research project, where the recommendations were that it was not worthy of adoption or further development for regulatory purposes. Contrary to that evaluation, the method has received supportive comments from a number of naval architects, and this paper is offered as a means of presenting it more widely to the industry. Individuals may wish to use the method to assess their own designs, or to provide some simple safety guidance to operators.

An Experimental Study on Progressive and Dynamic Damage Stability Scenarios

2014 ◽  
Author(s):  
Oliver Lorkowski ◽  
Hendrik Dankowski ◽  
Florian Kluwe
Keyword(s):  
Experimental Study ◽  
Model Test ◽  
Static Model ◽  
Model Tests ◽  
Time Dependent ◽  
Test Series ◽  
Design Stage ◽  
Damage Scenarios ◽  
Damage Stability ◽  
Set Up

Current damage stability rules for ships are based on the evaluation of a ship’s residual stability in the final flooding stage. The consideration of the dynamic propagation of water within the inner subdivision as well as intermediate flooding stages and their influence on the resulting stability is very limited in the current damage stability regulations. The investigation of accidents like the one of the Estonia or the European Gateway reveals that intermediate stages of flooding and the dynamic flooding sequence result in significant fluid shifting moments which have a major influence on the time-dependent stability of damaged ships. Consequently, the critical intermediate stages should be considered when evaluating designs with large cargo decks like RoRo vessels, RoPax vessels and car carriers. Also the safety of large passenger ships with respect to damage stability is affected by the aforementioned effects. In this context a new numerical flooding simulation tool has been developed which allows an evaluation of a ship’s time-dependent damage stability including all intermediate stages of flooding. The simulation model is based on a quasi-static approach in the time domain with a hydraulic model for the fluxes to ease the computation and allow for fast and efficient evaluation within the early design stage of the vessel. This allows studying multiple damage scenarios within a short period. For the further validation of this numerical simulation method a series of model tests has been particularly set up to analyse the time-dependent damage stability of a floating body. The test-body has been designed specifically to reflect the most typical internal subdivision layouts of ships affected by the effects mentioned above. The experimental study covers a static model test series as well a dynamic one. The static model test series has been set up with the aim to analyse the progressive flooding of selected compartments in calm water. Within the dynamic model test series, the model is excited by a roll motion oscillator to evaluate the influence of the ship motion on the water propagation and the associated damage stability. The model tests presented in this paper comprise side leaks in typical compartments which are used for a basic validation of the simulation toll and the measurement devices. Particular attention has been drawn on damage scenarios with critical intermediate flooding stages in consequence of restricted water propagation. The presented results enable a further validation of the numerical flooding simulation and give an insight view on the chosen experimental setup.

METAMODELING METHODOLOGY FOR POSTBUCKLING SIMULATION OF DAMAGED COMPOSITE STIFFENED STRUCTURES WITH PHYSICAL VALIDATION

2010 ◽  
Vol 10 (04) ◽  
pp. 705-716 ◽  
Author(s):  
KASPARS KALNINS ◽  
ROLANDS RIKARDS ◽  
JANIS AUZINS ◽  
CHIARA BISAGNI ◽  
HAIM ABRAMOVICH ◽  
...  
Keyword(s):  
Composite Structures ◽  
Design Procedure ◽  
Computer Experiments ◽  
Design Guidelines ◽  
Design Tool ◽  
Piecewise Linear Approximation ◽  
Stiffened Panel ◽  
Response Curves ◽  
Damage Scenarios ◽  
Stiffened Structures

A metamodeling methodology has been proposed for postbuckling simulation of stiffened composite structures with integrated degradation scenarios. The presence of artificial damage between the outer skin and stiffeners has been simulated as softening of the material properties in predetermined regions of the structure. The proposed methodology for the fast design procedure of axially or torsionally loaded stiffened composite structures is based on response surface methodology (RSM) and design and analysis of computer experiments (DACE). Numerical analyses have been parametrically sampled by means of the ANSYS/LS-DYNA probabilistic design toolbox extracting the load-shortening response curves in the preselected domain of interest. These response curves have been simplified using piecewise linear approximation identifying the buckling and postbuckling stiffness ratios along with the values of the skin and the stiffener buckling loads. Three stiffened panel designs and a closed box structure with preselected damage scenarios have been elaborated and validated with the tests performed within the COCOMAT project. The resulting design procedure provides a time-effective design tool for preliminary study and for elaboration of the optimum design guidelines for composite stiffened structures with material degradation restraints.

scholarly journals Assessment of Survivability of Surface Combatants after Damage in the Sea Environment

2017 ◽  
Vol 33 (02) ◽  
pp. 156-165
Author(s):  
Evangelos Boulougouris ◽  
Stuart Winnie ◽  
Apostolos Papanikolaou
Keyword(s):  
North Atlantic ◽  
Probabilistic Approach ◽  
Weather Conditions ◽  
Operating Conditions ◽  
Stability Assessment ◽  
Stability Criteria ◽  
The North ◽  
Damage Stability ◽  
Damaged Stability ◽  
The North Pacific

The operating conditions of modern warships, in the natural sea environment, have a significant influence on their survivability in the event that watertight integrity is lost. Up to now, the consideration of sea and weather conditions has been implicitly accounted for in a naval ship's damaged stability assessment. This article outlines a probabilistic approach to assessing a naval ship's damage stability, in which some of the limitations of the currently used damage stability criteria are identified, including the validity of the assumption of moderate sea states at the time of damage. An investigation of the operability of a frigate design found that there is a significant increase in the risk of a ship's loss when changing the operational area from the North Atlantic to the North Pacific. A remarkable additional finding of the study showed that the assumed distribution for the damage penetration has no significant effect on the ship's survivability because of the way modern combatants are designed.

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