FEA within Ship and Submarine Design Titelmasterformat ... ??• BMT Designers Planners • BMT Defence Services • BMT Design Technology • BMT Fleet Technology • BMT Hi-Q Sigma • BMT Isis • BMT Reliability

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  • Titelmasterformat durch Klicken bearbeiten

    CADFEM 2016

    FEA within Ship and Submarine Design James Underwood

    Principal Naval Architect & Structures Group Manager,

    BMT Defence Services Ltd

    1st CADFEM ANSYS Simulation Conference, United Kingdom

    2nd & 3rd November 2016 Oxford Spires Hotel, Oxford

  • BMT Group Overview

    A network of knowledge and resources

    ENERGY & ENVIRONMENT

    TRANSPORT DEFENCE3 sectors

  • BMT Designers &

    Planners

    BMT Defence

    Services

    BMT Design &

    Technology

    BMT Fleet

    Technology

    BMT Hi-Q Sigma

    BMT Isis

    BMT Reliability

    Consultants

    BMT Asia Pacific

    (Indonesia)

    BMT Cordah

    BMT Oceanica

    BMT WBM

    BMT ARGOSS

    BMT Scientific

    Marine Services

    BMT Fluid

    Mechanics

    BMT Asia Pacific

    (Malaysia)

    BMT Navcon

    Defence EnergyEnvironment

    BMT Asia Pacific

    (Hong Kong)

    BMT Asia Pacific

    (Singapore)

    BMT Consultants

    India

    BMT JFA

    BMT Ship &

    Coastal Dynamics

    BMT WBM

    (Machinery Group)

    Ports,

    Infrastructure

    and Resources

    Ship Design,

    Surveys and

    Vessel

    Performance

    BMT Nigel Gee

    BMT SMART

    BMT Surveys

    Verweij & Hoebee

    BMT Group

    Structure - sector

  • BMT Defence Services

    A subsidiary of BMT Group

  • Established in 1988 in

    Bath, UK,

    Two offices in Bath, with

    a further three offices in

    Fareham, Weymouth,

    and Barrow-In-Furness.

    Locations

    285 people based

    in Bath, UK

    55 people based

    in Fareham,

    Weymouth and

    Barrow, UK

  • BMT Defence Services

    Services

    NAVAL DESIGN & ENGINEERING

    SYSTEMS ENGINEERING

    ACQUISITION SUPPORT

    COMBAT SYSTEMS

    IN-SERVICE SUPPORT

    HYDRODYNAMICS

    TECHNICAL ASSURANCE

    STRUCTURAL DESIGN & ANALYSIS

    TECHNOLOGY MANAGEMENT

    SOFTWARE DEVELOPMENT

    HUMAN FACTORS

  • Whole Ship Stress Analysis

    Global Stress Analysis

    Focus on stress analysis in relation to Classification

    Society rules and prescribed reserve factors to ensure ship

    safety at sea under varying loading conditions.

    Fatigue analysis of ship at sea under varying loading

    conditions.

    FEA:

    Linear Elastic analysis of the whole ship under wave induced bending

    moment;

    Load applied through application of forces to transverse frames along

    the keel of the vessel or as surface pressure loads;

    Shell and Beam element modelling.

    Stress and buckling analysis of structure.

    Fatigue assessment of design details using sub-modelling with loading

    derived from global model.

    Images:

    Flight Deck: http://www.public.navy.mil/surfor/ddg86/Pages/News-Archive.aspx

    Bow Slamming: https://uk.pinterest.com/pin/484840716108123118/

    http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiG_IXnluTPAhXHuxQKHX7fADMQjRwIBw&url=http://www.public.navy.mil/surfor/ddg86/Pages/News-Archive.aspx&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiG_IXnluTPAhXHuxQKHX7fADMQjRwIBw&url=http://www.public.navy.mil/surfor/ddg86/Pages/News-Archive.aspx&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiD9oWIl-TPAhVKCBoKHab8BwAQjRwIBw&url=https://www.pinterest.com/pin/484840716108123118/&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076https://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwiD9oWIl-TPAhVKCBoKHab8BwAQjRwIBw&url=https://www.pinterest.com/pin/484840716108123118/&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076http://www.public.navy.mil/surfor/ddg86/Pages/News-Archive.aspxhttps://uk.pinterest.com/pin/484840716108123118/

  • Whole Ship Stress Analysis

  • Whole Ship Ultimate Strength Assessment

    Ultimate Bending Strength Assessment

    Focus on ultimate limit state analysis for vessel under

    wave induce bending moment in both the intact and

    damage condition.

    FEA

    Non-linear collapse analysis of the hull structure under global

    bending moment;

    Shell element model;

    Load applied by applying pure bending moment to longitudinal

    section of vessel;

    Model includes weld induced manufacturing imperfections and

    residual stresses.

    Structure will progressively fail from region in compression

    around side shell until complete failure occurs.

    Images: MOL Comfort: http://dev.twentytwowords.com/large-cargo-ship-snaps-in-two-in-rough-

    seas-both-pieces-remain-afloat-5-pics/

    Frigate FEA: Benson S. Progressive Collapse Analysis of Lightweight Ship Structures.

    Doctoral Thesis; November 2011.

    Destroyer FEA: Downes J, Ham WL, Dow RS. Assessment of the residual strength of a

    lightweight naval vessel. Proceedings of Practical Design of ships and Offshore Structures

    2013 (PRADS 2013).

    http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwie8smz5fjPAhUMDcAKHVNaBPIQjRwIBw&url=http://www.seanews.com.tr/news/105374/MOL-Comfort-forward-section-under-tow-to-Gulf-aft-section-still-adrift-.html&psig=AFQjCNFRvIw0u2xGGIlzdqpkGGmxtvHPvg&ust=1477582340579516http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwie8smz5fjPAhUMDcAKHVNaBPIQjRwIBw&url=http://www.seanews.com.tr/news/105374/MOL-Comfort-forward-section-under-tow-to-Gulf-aft-section-still-adrift-.html&psig=AFQjCNFRvIw0u2xGGIlzdqpkGGmxtvHPvg&ust=1477582340579516http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjuv9m6l-TPAhUH7hoKHV5kCdsQjRwIBw&url=http://dev.twentytwowords.com/large-cargo-ship-snaps-in-two-in-rough-seas-both-pieces-remain-afloat-5-pics/&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076http://www.google.co.uk/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjuv9m6l-TPAhUH7hoKHV5kCdsQjRwIBw&url=http://dev.twentytwowords.com/large-cargo-ship-snaps-in-two-in-rough-seas-both-pieces-remain-afloat-5-pics/&psig=AFQjCNFhAAFI_Yj8YRvhs7XHXdmnJHAqCA&ust=1476874034610076http://dev.twentytwowords.com/large-cargo-ship-snaps-in-two-in-rough-seas-both-pieces-remain-afloat-5-pics/

  • Whole Ship Ultimate Strength Assessment

  • Whole Ship Ultimate Strength Assessment

  • Structural Integration

    Replenishment at Sea (RAS) of liquid and solid stores to re-

    store front line warships from auxiliaries within a hostile

    area.

    Auxiliary lines run from bespoke RAS Mast to RAS

    connection points on receiving ship.

    Loading required to contend with line loads whose tension

    is maintained by series of active winches.

    Structural capability to comply with Classification Society

    rules based on an allowable stress approach in relation to

    prescribed reserve factors.

    FEA:

    Linear elastic analysis for peak stress in structure of mast and its

    integration up to two decks below weather deck.

    Shell and beam element modelling.

    Buckling assessment of mast structure.

    Fatigue analysis of mast structure.

    Model built using ANSYS Mechanical APDL, though subsequent study

    showed significant modelling time savings by using ANSYS SpaceClaim

    and Workbench.

    RAS Mast

  • Structural Integration

    RAS Mast

  • Structural Integration

    RAS Mast

  • Submarine Pressure Hull Design

    Pressure hull design undertaken to required dive depth

    multiplied by required safety factors.

    Focus on ultimate collapse strength of the pressure hull

    and end closure structures.

    Failure due to instability of the pressure hull or end

    closure dome.

    Concept end closure studies:

    Current end closures of large diameter submarines are

    either hemispherical or torospherical in form,

    manufactured through the welding of segments of very

    thick plate into which double curvature has been cold

    pressed.

    Current process is therefore very complex and

    expensive.

    BMT investigated concepts surrounding alternative end

    closures including flat sandwich bulkhead and faceted

    dome form.

    End Closure Analysis

  • Submarine Pressure Hull Design

    End Closure Analysis

  • Submarine Pressure Hull Design

    End Closure Analysis

  • Submarine Pressure Hull Design

    End Closure Analysis

  • Submarine Pressure Hull Design

    End Closure Analysis

  • Copyright Statement

    Copyright 2016 by BMT Defence Services

    All rights reserved. No part of this publication may be reproduced,

    distributed, or transmitted in any form or by any means, including

    photocopying, recording, or other electronic or mechanical methods,

    without the prior written permission of BMT Defence Services.

    Where content has not been produced by BMT Defence Services, w