ABS 218-2015 GUIDE FOR ENHANCED SHAFT ALIGNMENT.pdf
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1、 Guide for Enhanced Shaft Alignment GUIDE FOR ENHANCED SHAFT ALIGNMENT OCTOBER 2015 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2015 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword The ABS
2、 Guide for Enhanced Shaft Alignment has been developed to address requests from owners and operators who wish to perform a more detailed shaft alignment analysis and installation assessment. Vessels designed, constructed and operated in compliance with the requirements of this Guide may be assigned
3、the Class Notation ESA. Assignment of the ESA Notation requires the review of plans and calculations by an ABS Engineering Office and the attendance of an ABS Surveyor during additional shafting alignment efforts. The intention of the Guide is to address shafting arrangements that may benefit from a
4、 more detailed analysis and a more accurate and structured procedure so as to optimize the shaft alignment and improve the service life of the vessels powertrain. This Guide is intended to apply mainly to shaft alignment-sensitive vessels, as defined in this Guide, although it could apply to a wider
5、 range of powertrains including geared installations. The main aspects that distinguish compliance with this Notation from the standard Rule application are: Alignment process is to be conducted after engine or gearbox and other heavy machinery are installed on board and all major steel works are co
6、mpleted at the aft part of the vessel. Shaft alignment optimization calculations are required. Compulsory inclusion of hull deflections to be taken into account in the analysis. Requirement for Lateral Vibration (Whirling) analysis of the powertrain shafting system. Shaft alignment verification at m
7、ore than one service condition. The vessel must be assigned the Tailshaft Condition MonitoringTCM Notation. The ABS Guide for Enhanced Shaft Alignment is to be used in conjunction with all other applicable Rules, Guides and Guidelines published by ABS. This Guide becomes effective on the first day o
8、f the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of this Guide is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to rsdeagle.org. ii ABSGUIDE FOR ENHANCED SHAFT AL
9、IGNMENT .2015 Table of Contents GUIDE FOR ENHANCED SHAFT ALIGNMENT CONTENTS SECTION 1 General 1 1 Introduction . 1 1.1 ESA Notation . 1 1.3 Definitions 2 3 Application 3 3.1 General 3 5 Documentation 4 5.1 Documentation to be Submitted 4 TABLE 1 Propulsion Types and Shaft Alignment Systems that can
10、be Covered by the ESA Notation . 4 FIGURE 1 Typical Differences between Some ESA Notation Requirements and ABS Rules 1 SECTION 2 Calculation Requirements for the ESA Notation . 6 1 Calculations 6 1.1 General 6 1.3 Additional Specialized Calculations . 6 3 Hull Girder Deflections 10 3.1 General 10 FI
11、GURE 1 Schematic Showing the Requirement of the Gearbox Forces Calculation in the Shaft Alignment Analysis Report 7 FIGURE 2 Stern Tube Bearing Contact Analysis Screenshot from the ABS Shaft Alignment Software . 8 FIGURE 3 Representation of Critical Speeds for a Whirling Calculation using a Campbell
12、 Diagram 9 FIGURE 4 Screenshot from the ABS Shaft Alignment Software Showing Typical Data Required for Fast Determination of Hull Deflection for Shaft Alignment Optimization Analysis . 10 FIGURE 5 Typical Finite Element Model for the Purposes of Hull Deflection Calculations . 11 ABSGUIDE FOR ENHANCE
13、D SHAFT ALIGNMENT .2015 iii SECTION 3 Alignment Procedure . 12 1 General Requirements 12 1.1 Major Stages . 12 3 Ship in Drydock or Very Light Ballast (“Nearly Lightship“) Condition . 12 3.1 Conditions 12 3.3 Means of Bearing Reaction Measurement and Verification . 12 3.5 Drydock or Very Light Balla
14、st Condition (at Quay). 14 3.7 Light Ballast and Full Ballast Conditions during Sea Trials 15 3.9 Fully Laden Condition during Sea Trials 15 3.11 Shaft Installation Procedure for Direct Drive Powertrain without a Forward Sterntube Bearing . 15 3.13 Shaft Installation Procedure for Geared Drive Power
15、train . 16 3.15 Recordings 16 TABLE 1 Performance Characteristics of Typical Measurement Techniques 13 FIGURE 1 Bearing Reaction Values During Sea Trials for Different Vessel Conditions for the Forward Sterntube Bearing (FWD), the Intermediate Bearing (IB) and the Aftmost Main Engine Bearing (ME) 17
16、 FIGURE 2 Correlation between Measured and Calculated Bearing Reaction Values for a Specific Vessel Condition 17 SECTION 4 Sea Trials 18 1 General Requirements 18 1.1. Test Procedure 18 1.3 Running-in Procedure 19 FIGURE 1 Bearing Temperatures Monitored during Acceptance Sea Trials . 18 SECTION 5 Ma
17、intenance of ESA Notation . 20 1 Maintenance of ESA Notation. 20 SECTION 6 Surveys . 21 1 Initial Survey 21 3 Surveys after Construction 21 APPENDIX 1 Definitions of Shaft Alignment Optimization . 22 1 Shaft Alignment Optimization Alternative Definitions . 22 FIGURE 1 2D Design Optimization Mathemat
18、ical Concept . 22 FIGURE 2 3D and higher Design Optimization Mathematical Concept . 23 APPENDIX 2 References 24 iv ABSGUIDE FOR ENHANCED SHAFT ALIGNMENT .2015 Section 1: General SECTION 1 General 1 Introduction 1.1 ESA Notation Requirements of this Guide are optional for classification purposes. How
19、ever, where assignment of the optional notation ESA Enhanced Shaft Alignment is being requested, provisions of this Guide are compulsory. This Guide provides criteria for additional calculation requirements, such as design optimization, as well as more detailed requirements regarding the shaft align
20、ment procedures in support of the optional notation ESA - Enhanced Shaft Alignment. Typical differences can be explained through the flowchart examples of Section 1, Figure 1. FIGURE 1 Typical Differences between Some ESA Notation Requirements and ABS Rules ABS Steel Vessel Rules4-3-2/11.1.2(e)Shaft
21、 Alignment CalculationsHull Deflections Available: Bearing Reaction verification measurements taken in one condition (such as Dry Dock or Very Light Ballast condition).Hull Deflections Not Available: Load measurements taken in multiple loading conditions, as agreed.Whirling Calculations Requirements
22、 No forward ST bearing Bearing Span 450d Supports outside of hull Cardan shafts incorporated Calculated with all bearings loadedTCM Notation OptionalShaft Installation Procedure for Direct Drive Powertrain without a Forward Sterntube Bearing References in 4-3-2/7.3.4, 4-3-2/11.1.2(c)ESA NotationShaf
23、t Alignment CalculationsHull Deflections Compulsory Load measurements taken under ballast and fully laden conditions, as per 2/1.1.1(a) and 2/1.1.1(b) of the ESA Guide.Whirling Calculations Requirements Unanimously (i.e., all cases under ESA Notation) Calculated with all bearings loaded Calculated w
24、ith fore ST bearing unloadedTCM Notation CompulsoryShaft Installation Procedure for Direct Drive Powertrain without a Forward Sterntube Bearing 7 Steps distinguishing this procedure from the procedure followed when a forward sterntube bearing is included in the shaftline, Subsection 3/11 of the ESA
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