NAVAL ARCHITECTURAL CONSIDERATIONS IN THE DESIGN OF FLOATING DOCK

A brief introduction about floating docks, its advantages and types have been described. The naval architectural considerations which play a significant role in the design of floating dock have been explained. Typical ratios of L/B and L/D as a function of Dock’s lifting capacity have been presented. Empirical formulation for the same have also been indicated wherever applicable. Intact stability and its criterion as applicable for a floating dock have been described. Critical positions during evolution of docking operation and important considerations while performing stability calculations have been highlighted. Attention has also been drawn to the damage stability of floating dock. Aspects of longitudinal and transverse bending moment, which are the governing aspects in the scantling calculations have been described. Also typical methods for securing and mooring of floating dock, without compromising on flexibility for docking operations have been described. Methodology and consideration which has to be kept in mind while using design software (such as NAPA) have been indicated. Simple size optimization techniques which result in steel / ballast volume reduction have also been explained.

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

Marine Technology and SNAME News ◽

10.5957/mt1.2008.45.3.147 ◽

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.

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Structural Reliability of Oil Tanker in the Adriatic Sea Damaged in Collision and Exposed to Combined Bending Moments

Volume 11B: Honoring Symposium for Professor Carlos Guedes Soares on Marine Technology and Ocean Engineering ◽

10.1115/omae2018-77789 ◽

2018 ◽

Author(s):

Maro Ćorak ◽

Joško Parunov

Keyword(s):

Structural Reliability ◽

Adriatic Sea ◽

Bending Moment ◽

State Function ◽

Regression Equations ◽

Bending Moments ◽

Damage Stability ◽

Safety Indices ◽

Oil Tanker ◽

Damaged Ship

The aim of the paper is the assessment of structural reliability of oil tanker which may be damaged in collision accident in the Adriatic Sea and exposed to combined, horizontal and vertical bending moments. Damage size is assumed based on the direct numerical simulation of the ship-ship collision. This is justified for some specific sea environments, as the Adriatic Sea, where ship sailing routes and representative ship types involved in accidents are known, so possible collision scenarios may be reasonably predicted. Residual bending moment capacity under combined bending moment is calculated using regression equations developed based on non-linear finite element analysis. Still water vertical bending moments are obtained by damage stability analysis. Vertical and horizontal wave bending moments are determined by short-term response analysis of damaged ship in the Adriatic Sea, using transfer functions obtained by 3D panel hydrodynamic method. Limit state function is defined using interaction equation for damaged ship exposed to combined bending moments. Safety indices are calculated by FORM for different collision scenarios that are generated by MC simulations. Such approach enables to determine the safety indices for the most frequent damages and also to reveal the most critical situations resulting in the lowest safety indices.

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The GENUS aircraft conceptual design environment

Proceedings of the Institution of Mechanical Engineers Part G Journal of Aerospace Engineering ◽

10.1177/0954410018788922 ◽

2018 ◽

Vol 233 (8) ◽

pp. 2932-2947 ◽

Cited By ~ 6

Author(s):

H Smith ◽

D Sziroczák ◽

GE Abbe ◽

P Okonkwo

Keyword(s):

Practical Reasoning ◽

Design Method ◽

Aircraft Design ◽

Theoretical Background ◽

Optimization Techniques ◽

Design Environment ◽

Modern Computer ◽

Computer Based ◽

Design Software ◽

Aircraft Conceptual Design

The design of aircraft has evolved over time from the classical design approach to the more modern computer-based design method utilizing multivariate design optimization. In recent years, aircraft concepts and configurations have become more diverse and complex thus pushing many synthesis packages beyond their capability. Furthermore, many examples of aircraft design software focus on the analysis of one particular concept thus requiring separate packages for each concept. This can lead to complications in comparing concepts and configurations as differences in performance may originate from different prediction toolsets being used. This paper presents the GENUS Aircraft Design Framework developed by Cranfield University’s Aircraft Design Group to address these issues. The paper reviews available aircraft design methodologies and describes the challenges faced in their development and application. Following this, the GENUS aircraft design environment is introduced, along with the theoretical background and practical reasoning behind the program architecture. Particular attention is given to the programming, choice of methodology, and optimization techniques involved. Subsequently, some applications of the developed methodology, implemented in the framework are presented to illustrate the diversity of the approach. Three special classes of aircraft design concept are presented briefly.

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Topology and Size Optimization for Landslide Body in NC Lathe

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.288.3 ◽

2013 ◽

Vol 288 ◽

pp. 3-7 ◽

Cited By ~ 1

Author(s):

Zong Sheng Sai ◽

Gui Fei Wang ◽

Ming Cong

Keyword(s):

Dynamic Analysis ◽

Significant Role ◽

Dynamic Characteristics ◽

Numerical Control ◽

Optimization Process ◽

Size Optimization ◽

Static And Dynamic Characteristics ◽

Static And Dynamic Analysis ◽

Landslide Body ◽

Working Performance

Landslide Body, which is a combination part between Knife Tower and Saddle, plays a significant role in the working performance of the NC (numerical control) Lathe. So it is essential to optimize Landslide Body’s structure to improve static and dynamic characteristics. At first, the structure of NC Lathe is introduced. And then, static and dynamic analysis of Landslide Body is carried out before optimization. At the last, optimization process which consists of topology and size optimization is carried out. Based on the optimization results, a new structure of the Landslide Body is generated. It is proved that both static and dynamic characteristics are improved to some extent.

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Analysis of Internal Force and Deformation for Pit Retaining Structure by Considering the Interaction of Pile Stiffness

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.397 ◽

2013 ◽

Vol 838-841 ◽

pp. 397-401

Author(s):

Ming Li ◽

Ren Wang Liang

Keyword(s):

Finite Difference ◽

Engineering Design ◽

Axial Force ◽

Influence Factors ◽

Bending Moment ◽

Internal Force ◽

Equivalent Stiffness ◽

Deep Excavation ◽

Retaining Structure ◽

Design Software

In this paper, taking one deep excavation engineering as an example, modeling by the FLAC3D finite difference software, combining with the Lizheng deep excavation supporting design software, taking the equivalent stiffness of combination pile as 2.300-4.789(10-2m3), and analyzing the pile body bending moment, anchor axial force and pit deformation by considering interaction of pile stiffness. In addition, in this paper the influence factors of pile stiffness has been discussed, and provides a reference for the engineering design.

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Analisa Intact Stability dan Damage Stability pada Kapal Ro-Ro Ukuran Besar di Perairan Indonesia Berdasarkan IS CODE 2008

Kapal ◽

10.14710/kapal.v16i2.23095 ◽

2019 ◽

Vol 16 (2) ◽

pp. 65-73

Author(s):

M. Fikry Rizaldo ◽

Deddy Chrismianto ◽

Parlindungan Manik

Keyword(s):

Intact Stability ◽

Damage Stability ◽

Probabilistic Concept

Kapal penumpang feri Ro-Ro merupakan moda transportasi yang cukup efisien dan efektif. Karena bisa mengangkut manusia, kendaraan, dan muatan secara bersamaan. Akan tetapi kapal jenis ini masih banyak memiliki kekurangan berupa kondisi kapal feri Ro-Ro yang saat ini beroperasi di indonesia, di mana kebanyakan geladak kendaraan tidak kedap air karena banyaknya bukaan yang ada di sekeliling kapal sehingga apabila dihitung stabilitasnya baik intact maupun damage akan berpengaruh dalam memenuhi kriteria sesuai ketentuan IMO. Metode yang digunakan untuk penelitian ini adalah menggunakan software komputasi numerik yaitu maxsurf. Kriteria yang digunakan dalam analisa stabilitas intact dan damage menggunakan IS CODE 2008 MSC.267(85) Code on intacts stability Part B For Passengers dan SOLAS 2009 Chapter II-1 Resolution MSC.281 (85) (based on the probabilistic concept). Hasil analisa intact stability untuk kapal Ro-Ro 1000 GT (61.30 m), dan 5000 GT (109.40 m) telah memenuhi kriteria pada 3 kondisi dengan max GZ melebihi dari 250. Analisa damage stability yang menggunakan konsep problabilistik dengan perhitungan indek subdivisi R (required subdivision index), dan A (attained subdivison index), di mana nilai indeks A harus lebih besar atau sama dengan nilai indeks R (A≥R). Nilai indeks R dipengaruhi oleh jumlah penumpang kapal dan panjang ls, sedangkan nilai indeks A dipengaruhi oleh faktor pi dan si. Hasil perhitungan pada kedua kapal yaitu, kapal Ro-Ro 1000 GT dengan indek R = 0,69405 dan indek A= 0,7207, dan kapal Ro-Ro 5000 GT dengan indek R = 0,71449 dan indek A = 0,8679. Hasil Problabilistic Damage Stability untuk kedua kapal telah memenuhi kriteria (A ≥ R).

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

Journal of Marine Science and Engineering ◽

10.3390/jmse7120450 ◽

2019 ◽

Vol 7 (12) ◽

pp. 450 ◽

Cited By ~ 1

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.

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Size Optimization of a Solar-wind Hybrid Energy System Using Two Simulation Based Optimization Techniques

Fundamental and Advanced Topics in Wind Power ◽

10.5772/18007 ◽

2011 ◽

Cited By ~ 2

Author(s):

Orhan Ekren ◽

Banu Yetkin

Keyword(s):

Solar Wind ◽

Energy System ◽

Optimization Techniques ◽

Size Optimization ◽

Hybrid Energy System ◽

Hybrid Energy ◽

Simulation Based ◽

Simulation Based Optimization

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Concept Design of a New Non-Ship-Shaped FPSO

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.170-173.2222 ◽

2012 ◽

Vol 170-173 ◽

pp. 2222-2227 ◽

Cited By ~ 1

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.

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