IACS History File + TB

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1 IACS History File + TB Part A UR M68 Dimensions of propulsion shafts and their permissible torsional vibration stresses Part A. Revision History Version no. Approval date Implementation date when applicable Corr.2 (Nov 2012) 22 November Corr.1 (Mar 2012) 21 March NEW (Feb 2005) 20 February July 2006 Corr.2 (Nov 2012).1 Origin for Change: Suggestion by Machinery Panel Chairman.2 Main Reason for Change: An error in M68.6 Table of k and ck factors for different design features was discovered and corrected as follows: The column longitudinal slot under the heading thrust shafts external to engines moved under the heading intermediate shafts with..3 List of non-iacs Member classification societies contributing through the TC Forum and/or participating in IACS Working Group:.4 History of Decisions Made: The proposed correction has been unanimously agreed..5 Other Resolutions Changes.6 Dates: Original proposal: 06 June 2012 Made by: Machinery Panel Panel Approval: 06 June 2012 GPG Approval: 22 November 2012 (Ref _IGh) Corr.1 (Mar 2012).1 Origin for Change: Suggestion by an IACS member Page 1 of 3

2 Part B.2 Main Reason for Change: An error in a formula has been discovered which require correction..3 List of non-iacs Member classification societies contributing through the TC Forum and/or participating in IACS Working Group:.4 History of Decisions Made: The proposed correction has been unanimously agreed..5 Other Resolutions Changes.6 Dates: Original proposal: 03 January 2012 Made by: a Member Panel Approval: 16 February 2012 GPG Approval: 21 March 2012 (Ref _IGe) New (Feb 2005) Refer to TB document in Part B Annex 1. Page 2 of 3

3 Part B Part B. Technical Background List of Technical Background (TB) documents for UR M68: Annex 1. TB for New (Feb 2005) See separate TB document in Annex 1. Annex 2. TB for Corr.1 (Mar 2012) See separate TB document in Annex 2. Note: There is no separate TB document prepared for Corr.2 (Oct 2012). Page 3 of 3

4 Part B, Annex 1 Technical Background for UR M68 New, Feb 2005 WP/MCH Task 41 Technical Justification for revision of M33 M37 M38 M39 M48 and new UR M68 CIMAC established a working group (WG14) for the purpose of getting a unified practice among Classification Societies on the topic of shafting and permissible torsional vibrations. This WG14 concluded the work by the end of 2002, however, with a more restricted scope than the original. The original scope included issues for both 4-stroke and 2- stroke plants, but it soon became clear that due to the limited time (all to be within 2002) only 2-stroke plants with fixed pitch propellers could be handled. It was the intention of WG14 that the agreements of 2002 should be reflected in the rules of the participating societies. During the IACS MCH meeting in London 2003, it was agreed that actions should be taken versus very old URs, meaning a) confirm b) revise or c) delete. Among other, the above mentioned URs were chosen because: All 5 UR are interconnected and partly repeat each other Reservations were made Several societies practiced considerable deviations from the UR WG14 had concluded on something different (for 2-stroke) Design features for controllable pitch propellers lacking After revising the technical contents of the 5 URs, it was intended to merge them into one UR. The 4-stroke issues of WG14 (that were not in the agreement of 2002) had little or no relevance for the revision of these URs which only dealt with shafts. Of that reason the revision should include all relevant kinds of shafts. The draft UR replaces M33, M37, M38, M39 and M48. Note: This UR applies to ships constructed for construction from 1 July Submitted by WP/MCH Chairman 21 Dec 2004

5 Part B, Annex 2 Technical Background for UR M68 Corr.1, Mar Scope and objectives It has been discovered that an error in the formula for stress concentration in slots commonly applied for OD shafts. The formula as stated in IACS UR should be updated accordingly. The consequence is improved estimation of stress concentration in slots. 2. Engineering background for technical basis and rationale The original formula, that was based on/verified by FEM parameter studies is as follows: α t =2,3 +0,4 With intention of simplifying the equation, by only using parameters usually applied in shafting the following substitutions were made: e=2r => r=e/2 t= leading to the following equation: α t =2,3 +0,4 α t =2,3 +0,8 however, by error it was applied 0,4 x, rather than 0,4 x 2. Consequently the following formula has been stated and applied in the requirements: α t =2,3 +0,57 leading to: scf= +0,57 The correct formulae should be scf= +0,8

6 3. Source/derivation of the proposed IACS Resolution 4. Summary of Changes intended for the revised Resolution: Replace the original formulae with the amended formulae. 5. Points of discussions or possible discussions 6. Attachments if any

IACS History File + TB

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