A unique application and point of truth for Naval Architecture Calculations

2015 ◽  
Author(s):  
Rodrigo Perez ◽  
Verónica Alonso
Keyword(s):  
Concept Design ◽  
Stability Criteria ◽  
Power Prediction ◽  
Naval Architecture ◽  
Complete Control ◽  
Intact Stability ◽  
Damage Stability ◽  
Cad Cam ◽  
The Stability ◽  
Definition Of

Many tools handle with the calculation of compartment definition, hydrostatics, intact and damage stability and power prediction, but these calculations are separated from the rest of ship CAD/CAM tools. Ship designers need to work closely with the shipyards, in a complex and distributed environment making necessary to have suitable tools at early design stages to ensure profitable projects. Naval architecture is handled in FORAN with a revolutionary approach, where integration and advanced features are the relevant characteristics in a single and complete set of applications that are used in conjunction to other disciplines, from concept design to operation. This new approach groups the former modules for naval architecture available in FORAN from many years, is intuitive and user-friendly. The information is stored in a database instead of a wide set of files. As regards this feature, there are two different alternatives depending on the scope of the project. If the ship designer wants to calculate only naval architecture calculations, the solutions is based on a SQLITE database suitable for a standalone application. This approach benefits a ship design office, in the study of different design alternatives very quickly but having a complete control of them. The other option is integrating the Naval Architecture with the rest of FORAN design disciplines, in a single database based in Oracle. In this case, the great benefit comes from the single truth of data from concept design to operation, which ensures dramatically the reduction of errors and re-work. After the definition of compartments in 3D, by using a very fast application, the module guides the user through the naval architecture calculations with a tree of elements very intuitive, with powerful key algorithms and with a solid representation of spaces. The definition of the necessary entities to make any kind of calculation is very fast. For the intact stability a set of standard stability criteria is provided. It is based in a quick definition of loading conditions, initial situations, flooding conditions and compartment subdivisions. And for the evaluation of the damage stability a set of standard stability criteria are also provided, following deterministic and probabilistic approaches. With these tools any naval architect is able to make very fast all the necessary studies to assure the stability regulations are complied with.

A Review of the Ninth International Conference on the Stability of Ships and Ocean Vehicles (STAB 2006)

2008 ◽  
Vol 45 (03) ◽  
pp. 147-156
Author(s):  
Marcelo A. S. Neves ◽  
Vadim Belenky
Keyword(s):  
Rio De Janeiro ◽  
High Speed ◽  
International Conference ◽  
Intact Stability ◽  
Damage Stability ◽  
Operation Stability ◽  
The Stability

The paper gives a brief review of the papers presented at the Ninth International Conference on Stability of Ships and Ocean Vehicles that was held on September 25 to 29, 2006 in Rio de Janeiro, Brazil. The review covers the following stability-related subjects: stability regulations, intact stability, wind and waves, damage stability, stability in operation, stability of high-speed craft, and offshore vehicles.

scholarly journals The Stability Analyze of KM. Rejeki Baru Kharisma of Tarakan – Tanjung Selor Route

Teknik ◽  
2021 ◽  
Vol 42 (1) ◽  
pp. 52-62
Author(s):  
Alamsyah Alamsyah ◽  
Zen Zulkarnaen ◽  
Suardi Suardi
Keyword(s):  
Stability Analysis ◽  
Stability Criteria ◽  
Load Case ◽  
Ship Stability ◽  
Intact Stability ◽  
Ship Capsize ◽  
The Stability ◽  
Stability Area ◽  
The Ideal

Ship stability that is not according to the IMO standard will make the ship capsize when operating. The purpose of this research is to determine the cause of the overturn in terms of the stability criteria of the ship. The method used is software  of simulation. Stability analysis is carried out with the load case that occurs in the field when an accident occurs and the ideal loadcase according to PM 104 2017 standards about’s the transportation of operation. The results showed is cargo of goods placed on the roof top (loadcase 1) based on the criteria of Intact Stability; area of the stability arm curve at heeling 0° ~ 30° = 0.9417 m.deg, area 0° ~ 40° = 1,0200 m.deg, 30° ~ 40° = 0.0783 m.deg, GZ value at heeling 30° = 0.029 m, angle of occurrence of maximum GZ = 21.8°, and the initial GMt value = 0.135 m, the results stated that all did not meet the Intact Stability code A.749 criteria, while in it was obtained cargo of goods placed in the hull (loadcase 2) based on Intact Stability; area of the stability arm curve at heeling 0° ~ 30° = 4.5338 m.deg, area 0° ~ 40° = 7.1643 m.deg, area 30° ~ 40° = 2.6305 m.deg, GZ value at heeling 30° = 0.265 m, angle of occurrence of maximum GZ = 34.5°, and the initial GMt value = 0.621 m, the results stated that all met the Intact Stability code A.749 criteria

scholarly journals A Model for Intact and Damage Stability Evaluation of CNG Ships during the Concept Design Stage

2019 ◽  
Vol 7 (12) ◽  
pp. 450 ◽  
Author(s):  
Francesco Mauro ◽  
Luca Braidotti ◽  
Giorgio Trincas
Keyword(s):  
Natural Gas ◽  
Design Process ◽  
Design Stage ◽  
Concept Design ◽  
Compressed Natural Gas ◽  
Hull Form ◽  
Intact Stability ◽  
Damage Stability ◽  
Marine Engineering ◽  
Feasible Solutions

To face the design of a new ship concept, the evaluation of multiple feasible solutions concerning several aspects of naval architecture and marine engineering is necessary. Compressed natural gas technologies are in continuous development; therefore, there are no available databases for existing ships to use as a basis for the design process of a new unit. In this sense, the adoption of a modern multi-attribute decision-based method can help the designer for the study of a completely new ship prototype. A database of compressed natural gas ships was generated starting from a baseline hull, varying six hull-form parameters by means of the design of experiment technique. Between the attributes involved in the concept design process, stability is for sure one of the most relevant topics, both for intact and damaged cases. This work describes two approaches to identify the compliance of a ship with the intact stability regulations based on the ship main geometrical quantities. Moreover, a metamodel based on the maximum floodable length concept (damage stability) allows determining the main internal subdivision of the ship. The metamodel outcomes were compared with results from direct calculations on a ship external to the database, highlighting the adequate accuracy given by the developed methods.

Concept Design of a New Non-Ship-Shaped FPSO

2012 ◽  
Vol 170-173 ◽  
pp. 2222-2227 ◽  
Author(s):  
Tian Ying Wang ◽  
Jian Zhang ◽  
Jin Kun Liu
Keyword(s):  
Frequency Domain ◽  
Potential Flow ◽  
Three Dimensional ◽  
Stability Margin ◽  
Hydrodynamic Performance ◽  
Concept Design ◽  
Intensive Study ◽  
Factors Affecting ◽  
Intact Stability ◽  
Damage Stability

In order to give full play to the advantages of FPSOs in the development of offshore oilfields, a new non-ship-shaped FPSO concept named IQFP is put forward through intensive study on various factors affecting the performance of FPSOs. Then, the optimized IQFP general design of a project case is presented based on the IQFP concept. The intact stability and damage stability of the IQFP are calculated and checked according to IMO rules. The hydrodynamic performance in frequency domain is simulated using the three-dimensional potential flow theory and compared with that of a ship-shaped FPSO with similar tonnage. The results indicate that the IQFP has a large stability margin and more excellent hydrodynamic performance than the ship-shaped FPSO. Through the research of this paper, the excellent characteristic of the new FPSO concept IQFP is verified and the basis and foundation are provided for the further studies.

scholarly journals Optimal Design of Submarine Pipelines by a Genetic Algorithm with Embedded On-Bottom Stability Criteria

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Juliana Souza Baioco ◽  
Mauro Henrique Alves de Lima ◽  
Carl Horst Albrecht ◽  
Beatriz Souza Leite Pires de Lima ◽  
Breno Pinheiro Jacob ◽  
...  
Keyword(s):  
Design Methodology ◽  
Visual Inspection ◽  
Stability Criteria ◽  
Submarine Pipeline ◽  
Computational Tool ◽  
Design Time ◽  
The Stability ◽  
Definition Of ◽  
Seabed Bathymetry ◽  
Pipeline Design

This work describes a computational tool, based on an evolutionary algorithm, for the synthesis and optimization of submarine pipeline routes considering the incorporation of on-bottom stability criteria (OBS). This comprises a breakthrough in the traditional pipeline design methodology, where the definition of a route and the stability calculations had been performed independently: firstly, the route is defined according to geographical-topographical issues (including manual/visual inspection of seabed bathymetry and obstacles); afterwards, stability is verified, and mitigating procedures (such as ballast weight) are specified. This might require several design spirals until a final configuration is reached, or (most commonly) has led to excessive costs for the mitigation of instability problems. The optimization tool evaluates each candidate route by incorporating, as soft and hard constraints, several criteria usually considered in the manual design (pipeline length, bathymetry data, obstacles); also, with the incorporation of OBS criteria into the objective function, stability becomes an integral part of the optimization process, simultaneously handling minimization of length and cost of mitigating procedures. Case studies representative of actual applications are presented. The results show that OBS criteria significantly influences the best route, indicating that the tool can reduce the design time of a pipeline and minimize installation/operational costs.

scholarly journals MODIFIKASI KAPAL PURSE SEINE 30 GT DENGAN MENAMBAHKAN CADIK UNTUK MENINGKATKAN SURVIVAL OF INTACT STABILITY

2019 ◽  
Vol 10 (2) ◽  
pp. 205-213
Author(s):  
Hasanudin Hasanudin ◽  
Totok Yulianto ◽  
Rizky Chandra Ariesta
Keyword(s):  
High Risk ◽  
Data Collection ◽  
Purse Seine ◽  
Fishing Gear ◽  
Naval Architecture ◽  
Operation Process ◽  
Intact Stability ◽  
Two Phases ◽  
The Stability ◽  
Vessel Stability

A fishing operation is a dangerous and high risk activity. Stability of the vessel plays an important role in performing safely and successfully fishing operations. A brand new 30 GT purse seiner, production of a traditional shipyard in Batang Regency, experienced 15o heel after its launch. This condition potentially affects the stability of the vessel. The purpose of the study is to analyze the vessel stability and improve existing stability by adding outriggers. Research was conducted in two phases, data collection in the research site and stability analysed using a naval architecture software. The vessel stability was analyzed in six loading scenarios following the fishing operation process, subsequently the stability was compared against IMO standard. Results show that with the existing design, the vessel does not meet IMO criteria for the most applied scenarios. Next step, outriggers were added in both sides of the vessel model, as an effort to improve its stability. Accordingly, it is revealed that outriggers addition is scientifically proven to improve the stability of the studied vessel. As this research merely focused on the stability improvement, further analysis regarding maneuverability is required given a purse seiner operates encircled fishing gear. Keywords: outrigger, purse seiner, stability

Completeness on the stability criterion of fractional order LTI systems

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
Yiheng Wei ◽  
Yuquan Chen ◽  
Songsong Cheng ◽  
Yong Wang
Keyword(s):  
Fractional Order ◽  
Stability Criterion ◽  
Positive Definite Matrix ◽  
Order System ◽  
Linear Matrix ◽  
Matrix Inequalities ◽  
Stability Criteria ◽  
The Stability ◽  
Definition Of ◽  
And Control

AbstractThe importance of the concept of stability in fractional order system and control has been recognized for some time now. Recently, it has become evident that many conclusions were drawn, but little consensus was reached. Consequently, there is an urgent need for a much deeper understanding of such a concept. With the definition of fractional order positive definite matrix, a set of equivalent and elegant stability criteria are developed via revisiting a stability criterion we proposed before. All the results are formed in terms of linear matrix inequalities. Afterwards, a series of interesting properties of these criteria are revealed profoundly, including completeness, singularity, conservatism, etc. Eventually, a simulation study is provided to validate the effectiveness of the obtained results.

scholarly journals Consideration of International Maritime Organization (IMO) proposals when developing new requirements of the Russian Register of Shipping to the stability of ship

2020 ◽  
pp. 39-44
Author(s):  
Р.В. Борисов ◽  
М.А. Кутейников ◽  
А.А. Лузянин ◽  
В.Р. Самойлов
Keyword(s):  
Stability Diagram ◽  
Stability Criteria ◽  
Short Term ◽  
Reliable Determination ◽  
Intact Stability ◽  
Domestic Practice ◽  
The Stability ◽  
New Generation

При создании норм для морских судов, попадающих в разнооб­разные гидрометеорологические условия, достоверный расчет кренящих моментов затруднителен, и задача определения мини­мально допустимых характеристик остойчи­вости (критериев) решалась путем анализа статистических данных об остойчивости судов, успешно эксплуатировавшихся или потерпевших аварию вследствие недоста­точной остойчивости. Применительно к тре­бованиям ИМО в качестве нормируемых характеристик остойчивости были приняты характеристики начальной остойчивости и диаграммы статической остойчивости. В настоящее время в ИМО ведется активная работа по созданию критериев остойчивости нового поколения, учитывающих более широкий круг явлений, опасных с точки зрения остойчивости судна, Действующие нормы Кодекса ИМО по остойчивости 2008 года их не учитывают. С учетом близости отечественных и международных методик оценки кратковременных и долговременных показателей мореходности анализируются результаты этой работы и оценивается возможность использования предлагаемых в ИМО подходов в отечественной практике нормирования море­ходности. For sea going ships operated in different hydro meteorological conditions reliable determination of heeling moments is difficult and the task of obtaining minimum allowable stability characteristics (criteria) was done by statistical stability analysis of ships successfully operated or capsized due to lack of stability. At IMO requirements intact stability was regulated by meta centric height ana stability diagram requirements. Currently, IMO is actively working on creating new generation stability criteria, which take into account a wider range of phenomena hazardous in terms of ship stability. The current standards of the IMO Stability Code 2008 do not take them into account. Considering the proximity of domestic and international methods for assessing short-term and long-term seaworthiness indices, the results of this work are analyzed and the possibility of using the approaches proposed by IMO in the domestic practice of seaworthiness rationing is evaluated.

A Review of the 8th International Conference on the Stability of Ship and Ocean Vehicles (STAB 2003)

2005 ◽  
Vol 42 (01) ◽  
pp. 21-30
Author(s):  
Luis Pérez Rojas ◽  
Vadim L. Belenky
Keyword(s):  
Environmental Modeling ◽  
Paper Briefly ◽  
International Conference ◽  
Regulatory Aspects ◽  
Water On Deck ◽  
Fishing Vessels ◽  
Intact Stability ◽  
Damage Stability ◽  
Design For Safety ◽  
The Stability

This paper briefly reviews the papers presented at the 8th International Conference on Stability of Ship and Ocean Vehicles that was held September 15–19, 2003, in Madrid, Spain. The review covers the following stability-related subjects: history, accident investigation, water on deck, extreme weather effects, stability of unconventional vessels, design for safety, damage stability, including large passenger vessels, para-metric roll, regulatory aspects, environmental modeling, human factors, safety in operations, nonlinear dynamics, unconventional problems, intact stability, antirolling devices, fishing vessels stability, and ship motion in waves, as well as several workshops on intact stability, damage stability, fishing vessels, and risk-based designs.

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