The Latest Progress of CCS Research on Springing & Whipping And Joint Industry Project with MARIN

Transcription

1 The Latest Progress of CCS Research on Springing & Whipping And Joint Industry Project with MARIN Dr. Wang Hui, CCS Shanghai, Copyright China Classification Society

2 Contents 1. CCS Research CCS research on spring and whipping effects for large ships 2. CCS Rule and Service CCS assessment procedure for springing and whipping effects 3. Ongoing JIP with MARIN Joint Industry Project with MARIN in Sloshing of Liquefaction Natural Gas (SLING) 4. Further Cooperation with MARIN Future cooperation with MARIN in JIP of Large Container Ships in Waves 2

3 Springing and Whipping Springing Low, moderate sea Low natural frequency of hull girder Harmonic vibration Fatigue strength Whipping Severe, moderate sea Large bow-flare high vessel speed Forced vibration Ultimate Fatigue 3

4 bending moments 1 CCS Research Fatigue Effects on Large Ships Springing and whipping effects on fatigue strength of large ships Model tests of large bulk carrier and VLCC 2d and 3d Numerical analysis on springing and whipping loads and structural responses Fatigue assessment (spectral, rainflow) Guidance notes on fatigue assessment of springing and whipping Clc-WM Clc-CM Test-WM Test-CM /L 4

5 V.B.M (kn.m) 1 CCS Research Loads and Effects on ULCS Springing and whipping loads and effects on ultra large container ships Model test of ULCS (on going) 3d numerical analysis and fatigue/ultimate strength assessment of several ULCS Key factors on hull hydro-elastic response (damping, velocity, heading, scatter diagram etc.) Improvement of guidance notes on fatigue assessment of springing and whipping Guidance notes on ultimate strength assessment of whipping effects 4.0x x x x T (s) 5

6 1 CCS Research HMS Hull monitoring system Research on the hull monitoring system Rules of HMS requirements Provide technical service based on the type of ships ULCS, VLCC Provide system selection and installation of HMS for ship owner Full scale measurements plan (in progress) Whipping and springing controlled by HMS 6

7 1 CCS Research Participation in IACS PT PH38 Container Ship Whipping As a consequence of Recent accidents (MSC Napoli, MOL Comfort) Members: BV, ABS, CCS, DNV-GL, KR, LR Two main objectives Review the existing publications on global hydro elastic response of ships with particular attention to whipping Derive minimum functional requirements for whipping phenomena Four work packages WP1 Identification of the State of the Art WP2 Evaluation of whipping influence on several ships WP3 Evaluation of the structural capacity during whipping WP4 Reporting CCS work Review of the state of the art, software benchmark, numerical simulation, assessment procedure, critical parameters 7

8 2 CCS Rule and Service Rules and Guidance Springing and Whipping Guidance Notes for the Calculation of Springing and Whipping Effects on Hull Structure Fatigue Strength (2015) Guidance Notes for the assessment of Ultimate Strength Due to Whipping Effect (draft version, 2016) Guidelines for fatigue strength of ship structures (2015) Hull monitoring system Rules for classification of sea-going steel ships. (Pt.8 Ch.21, 2016) 8

9 垂向弯矩 (KN.m) 2 CCS Rule and Service Software Development for Springing and Whipping COMPASS-WALCS-LE (WAve Loads Calculation System - LinEar) 3d panel Linear hydro-elastic loads (Frequency domain linear springing) 2d beam structure model Released to the industry at July 2015 Validation by tests and calculations COMPASS-WALCS-NE (WAve Loads Calculation System - NonlinEar) 3d panel non-linear hydro-elastic loads (Time domain nonlinear whipping) 2d beam structure model Released to the industry at December 2015 Validation by tests and calculations EXPERIMENT COMPASS-WALCS-LE COMPASS-WALCS-NE 测点位置 9

10 2 CCS Rule and Service Fatigue Assessment of Springing & Whipping Effects Ship type 13500TEU ULCS Application of the procedure Direct calculation of linear springing and nonliear whipping loads Two loading conditions (BLA, TSD) Sea states 4 velocities, all headings Software:COMPASS-WALCS-LE CCS-NCSR Results Influence factor of springing and whipping effects Fatigue strength meets the requirements of rules and guidelines of CCS 10

11 3 Ongoing JIP with MARIN Sloshing of Liquefaction Natural Gas (SLING) Goal: optimize design of LNG cargo and fuel tanks Maximum use of ship capacity Minimum Boil-Off Gas Maximum operating envelope Organization 4 universities, 5 faculties User committee Status Researcher team in place Kick-off meeting and Annual review meeting Infrastructure completed Test set-ups installed inside 11

12 3 Ongoing JIP with MARIN Participation of CCS in SLING , CCS office , MARIN office , GTT office ~3.3, Shanghai MARIN, GTT and CCS discussed the New JIP Contract SLING and Kick-off meeting 2016 Annual review meeting of SLING Workshop on sloshing and LNGC issues 12

13 3 Ongoing JIP with MARIN Future Works Future works of SLING To identify the effect of multiphase dynamics; the effect of variability of impact loads; To quantify the structural response; To build a first-principle approach of sloshing Research carried out by CCS 3D sloshing effect and impact loads; Coupled motion of tank and ship; Sloshing Guidelines and software updating Target Hull structure, cargo containment system, pump tower All liquid ships (oil tankers, Chemical tanker, m-lngc, FLNG, Small-scale LNGC & LNG as Fuel) 13

14 4 Further Cooperation with MARIN Large Container Ships in Waves Goal To develop a design method for efficient, clean and safe operation of large containerships in waves, based on combined calculations, model tests and full scale monitoring. Organization COSCO-Shipping, CCS, MARIN, SSSRI, MARIC User committee will be organized Status Project proposals; Discussion meetings; Still call for participants 14

15 4 Further Cooperation with MARIN Participation of CCS Meeting Discussion meeting with COSCO-Shipping, SSSRI, MARIC Video Discussion meeting with MARIN, SSSRI, MARIC Discussion meeting with MARIN, SSSRI, MARIC CCS Work plan: To develop technical standards and service program Numerical simulations, data analysis, ULCS verifications Guidance notes on numerical simulation and strength assessment Model test standards of slamming, springing, whipping and lashing To optimize and upgrade ship type design plan based on ship verifications 15

16 Contact Name: Wang Hui Job Title: Ph.D./Senior Engineer/ Project manager Work experience: Ship structural rules researcher of Rules & Technology Center, CCS. Experience in ship model test,expert on the field of ship impact loads. Member of IACS PT PH38 Work Group Container Ship Whipping Phone: +(86)

17 Copyright China Classification Society