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Propulsion Shafting Alignment

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Propulsion Shafting Alignment Guidance Notes on Propulsion Shafting Alignment GUIDANCE NOTES ON PROPULSION SHAFTING ALIGNMENT SEPTEMBER 2019 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2019 American Bureau of Shipping. All rights reserved. 1701 City Plaza Drive Spring, TX 77389 USA Foreword Foreword ABS identified the need to provide a more detailed explanation of alignment design and practices, which resulted in the development of the Guidance Notes on Propulsion Shafting Alignment. Their primary purpose is to provide clarification for ABS Surveyors and plan review engineers to verify consistency of the survey and plan approval processes. Regarding the shaft alignment design and implementation efforts by the shipbuilding industry, these Guidance Notes are valuable to further advance its approach towards shaft alignment analyses and procedures. Additionally, ABS has developed state-of-the-art analytical tools primarily for the purpose of engineering analysis and design. The ABS shaft alignment program, combined with alignment optimization software, is capable of analyzing complex propulsion installations and, when used as a design tool, may provide an optimized solution to the alignment problem. This 2019 edition is arranged to include additional topics on shaft alignment condition monitoring and a section dedicated to alignment problems and their solutions. Shaft alignment survey requirements are summarized in the introduction and are addressed further under a separate section on shaft alignment procedures and practices. Discussion on alignment calculation and measurement is expanded to include the stern tube bearing clearance measurement. Additional clarification is provided on the application of the hull deflections, alignment optimization, propulsion systems with no forward stern tube bearing, and reverse engineering calculation. These Guidance Notes become effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of these Guidance Notes is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to [email protected] Terms of Use The information presented herein is intended solely to assist the reader in the methodologies and/or techniques discussed. These Guidance Notes do not and cannot replace the analysis and/or advice of a qualified professional. It is the responsibility of the reader to perform their own assessment and obtain professional advice. Information contained herein is considered to be pertinent at the time of publication but may be invalidated as a result of subsequent legislations, regulations, standards, methods, and/or more updated information and the reader assumes full responsibility for compliance. Where there is a conflict between this document and the applicable ABS Rules and Guides, the latter will govern. This publication may not be copied or redistributed in part or in whole without prior written consent from ABS. ii ABS GUIDANCE NOTES ON PROPULSION SHAFTING ALIGNMENT . 2019 Table of Contents GUIDANCE NOTES ON PROPULSION SHAFTING ALIGNMENT CONTENTS SECTION 1 Introduction to Propulsion Shafting Alignment .................................. 1 1 General ............................................................................................... 1 2 Objectives ........................................................................................... 2 3 The Shaft Alignment Challenge .......................................................... 3 3.1 Modern Vessel Design .................................................................... 3 3.2 Shaft Alignment Design ................................................................... 4 3.3 Solution to the Alignment Challenge ............................................... 5 3.4 Analytical Support ........................................................................... 6 4 Rule Requirements ............................................................................. 7 5 Shaft Alignment Survey ...................................................................... 7 5.1 Required Information ....................................................................... 7 5.2 Attendance ...................................................................................... 8 6 Commitment to Safety ........................................................................ 9 SECTION 2 Shaft Alignment Design and Review .................................................. 10 1 General ............................................................................................. 10 2 Review vs. Design ............................................................................ 10 3 Review .............................................................................................. 11 3.1 Plans and Particulars .................................................................... 11 3.2 Sign Convention ............................................................................ 13 3.3 Shaft Alignment Model .................................................................. 14 3.4 Scope of Calculation ..................................................................... 14 3.5 Results Verification ........................................................................ 15 3.6 Shaft Alignment Procedure ............................................................ 24 3.7 Documenting the Review ............................................................... 24 4 Design ............................................................................................... 25 4.1 General.......................................................................................... 25 4.2 Aft Stern Tube Bearing .................................................................. 25 4.3 Aft Stern Tube Bearing – Single Slope Design .............................. 29 4.4 Aft Stern Tube Bearing – Double Slope Design ............................ 35 4.5 Aft Stern Tube Bearing Dynamic Analysis using FSI ..................... 37 4.6 No Forward Stern Tube Bearing Installations ................................ 40 4.7 Crankshaft Modeling ..................................................................... 43 4.8 Applying a Partial Equivalent Model of the Crankshaft .................. 45 4.9 Engine Bearing Misalignment ........................................................ 47 ABS GUIDANCE NOTES ON PROPULSION SHAFTING ALIGNMENT . 2019 iii 4.10 Bearing Elasticity ........................................................................... 47 4.11 Bearing Wear Down ....................................................................... 48 4.12 Aft Stern Tube Bearing Clearance Calculation .............................. 48 4.13 Gear Meshes ................................................................................. 50 TABLE 1 Influence Coefficient Matrix ..................................................... 18 FIGURE 1 Directly Coupled Propulsion Shafting – Example ................... 11 FIGURE 2 Load Application – Sign Convention ....................................... 13 FIGURE 3 Moment Sign Convention in ABS Shaft Alignment Program .................................................................................. 13 FIGURE 4 Axial, Vertical and Rotational Beam Displacements ............... 14 FIGURE 5 Calculated Bearing Reactions ................................................. 19 FIGURE 6 Simulated Jack-Up Diagram ................................................... 20 FIGURE 7 Stern Tube Bearing Misalignment ........................................... 20 FIGURE 8 Deflection Curve and Nodal Slope .......................................... 21 FIGURE 9 Example of Diesel Engine Output Flange Allowable Shear Force and Bending Moment Chart .......................................... 22 FIGURE 10 Aft Stern Tube Bearing Evaluation Software .......................... 23 FIGURE 11 Desired Contact Between the Shaft and Bearing (No Misalignment) ................................................................... 26 FIGURE 12 Aft Stern Tube Bearing Contact as a Function of Alignment Design ..................................................................................... 28 FIGURE 13 Misalignment Angle ................................................................. 29 FIGURE 14 Double Slope ........................................................................... 35 FIGURE 15 Example: Double Slope Design .............................................. 36 FIGURE 16 Ahead Run at MCR at Zero Rudder ........................................ 39 FIGURE 17 Starboard Transient Turn Simulation ...................................... 39 FIGURE 18 Port Transient Turn Simulation ............................................... 40 FIGURE 19 Equivalent Model – No Forward Stern Tube Bearing ............. 41 FIGURE 20 Crankshaft FE Model .............................................................. 43 FIGURE 21 Crankshaft – Equivalent Model for Shaft Alignment ............... 43 FIGURE 22 FE Model of Half of the Crank ................................................. 44 FIGURE 23 Defining Equivalent Model ...................................................... 44 FIGURE 24 Reduced Crankshaft Model – 2 M/E Bearings Only ............... 46 FIGURE 25 Reduced Crankshaft Model – 4 M/E Bearings ........................ 46 FIGURE 26 ABS Bearing Evaluation Interface ........................................... 48 FIGURE 27 Installation with Forward and Aft Stern Tube
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