Research Activities on Minimum Propulsion Power (MPP) under the Framework of EEDI
China Ship Scientific Research Center
CHINA SHIP SCIENTIFIC REAEARCH CENTER
2018/10/24
Contents
China Ship Scientific Research Center 2
01 Introduction
02 China’s research activities on MPP
03 Summary
China Ship Scientific Research Center 3
Introduction
PART ONE
1
China Ship Scientific Research Center 4
Introduction
Goal Based Standard
2G Intact Stability
Ballast Water Management
Energy Efficiency Design Index
Reduction of GHG Emissions
IMO put forward a series of new conventions, new codes andnew standards for energy saving and GHG emission reduction.
Modern Green ShipSafetyEnvironmental protection High efficiencyHealthy
China Ship Scientific Research Center 5
Introduction
(Most convenient)
Implementation of EEDI
Reduction of installed power
/operational speed
Phase3(2025~)
Innovative energy efficiency
technologies
(High cost)
Measures to reduce EEDI
Energy-savingdevices
Heading stability
Adverse conditions
IMO set up working group for Minimum Propulsion Power(MPP)
Phase1(2015 ~2019)
Phase2(2020~2024)
Escape from danger zone
Safety accident
Conflictbetween
EEDI and MPP
China Ship Scientific Research Center 6
Introduction
•Interim Guidelines•MSC-MEPC.2/Circ.112012
•2013 Interim Guidelines•Resolution MEPC.232(65)2013
•Amendments to 2013 Interim Guidelines•Resolution MEPC.255(67)2014
•Amendments to 2013 Interim Guidelines, as amended•Resolution MEPC.262(68)2015
•Draft revised Guidelines for MPP (up-to-date)•MEPC71/5/13、MEPC71/INF.282017
Development history of Guidelines for Minimum Propulsion Power in IMO
•Proposed amendments to 2013 Interim Guidelines(China)•MEPC72/5/9、MEPC72/INF.162018
China Ship Scientific Research Center 7
Introduction International research status of EEDI and Minimum Propulsion Power
Research project Energy Efficient Safe Ship Operation (SHOPERA) andJapan's R&D project (JASNAOE) have carried out in-depth research onMinimum Propulsion Power for revising the 2013 Interim Guidelines,and they finally proposed a draft revised Guidelines at MEPC 71;
At MEPC70, one proposal was submitted for pulling ahead of phase3 standards to 2022 and considering phase 4 to go into effect 2025 as analternative to revising phase 2 standards, which means the EEDIrequirement becomes increasingly demanding;
At MEPC72, the Initial IMO Strategy on Reduction of GHG Emissionsfrom Ships has been issued, the conflict between EEDI and MinimumPropulsion Power continuously increase.
Characteristics and differences with fw:
• More adverse sea conditions (BF8~BF9);
• Lower advance speed (2~4 knots);
• Lack of high accuracy numerical methods;
• Model test becomes unstable.
Irrationalities of the 2013 Interim Guidelines:• The deduction factor t and wake fraction wrepresents the interaction between ship hulland propeller, the value of t and w in bollardpull state(v=0 knot) is quite low. Does thismean the lower the speed, the weaker theinteraction?
China Ship Scientific Research Center 8
Introduction Key aspects of MMP research
Minimum Propulsion Power
Safety maneuverability in adverse sea conditions
Added resistance in wind and waves
Propulsion performance in waves with low speed
In-depth study is necessary for revising the 2013 Interim Guidelines.
China Ship Scientific Research Center 9
China’s research activities on MPP
PART TWO
2
China Ship Scientific Research Center 10
China’s research activities on MPP
Structure of China’s EEDI and MMP research team
EEDI Expert Working Group
Research Institutes
Universities
Class
Shipyards
Ship owners
Ministry of Industry and Information Technology
CSSRC SSSRI SDARI
Harbin Engineering University
China Classification Society
DSIC GSI
COSCO
China Ship Scientific Research Center 11
China’s research activities on MPP
Brief introduction of CSSRC
China Ship Scientific Research Center
More than 30 research facilities
Beautiful working environment
Marine applied basic research , design and development
Deep-sea equipment R & D
China Ship Scientific Research Center 12
China’s research activities on MPP
Main contents of China’s research work
Numerical and Experimental study on ship behavior in adverse sea
•In house developed code for prediction of wave added resistance
•Experimental validation of ship behavior in winds and waves, low speeds
1
Analysis of Minimum Propulsion Power assessment for new ships
•Statistical analysis of assessment Level-1 according to Interim Guidelines
•Depth analysis of assessment Level-2 for new designed ships
2
Research on innovative energy efficiency technologies
•Air Lubrication System
•Wind Propulsion System
3
China Ship Scientific Research Center 13
China’s research activities on MPP
In house developed code for prediction of wave added resistanceImproved STF strip method[DUAN & LI(2013)]
More consistent with the model test results.
heading
back wave area
China Ship Scientific Research Center 14
China’s research activities on MPP
In house developed code for prediction of wave added resistanceHybrid TEBEM method [DUAN & CHEN(2017)]
The proposed method can solve the inaccurate prediction for seakeepingperformance of ships at low speeds in adverse conditions.
XY
Z
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.20.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
K aw
λ/Lpp
TEBEM EXP
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.60.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
η 3/ζ a
λ/Lpp
TEBEM EXP
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.60.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
η 5/k ζa
λ/Lpp
TEBEM EXP
0 1 2 3 4 5 6 7 8 9 10-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
η 3/ζ a
t/T
Heave
Objective: VLCCSea condition: BF8Advance speed: 6.3kn
China Ship Scientific Research Center 15
China’s research activities on MPP
Numerical prediction and experimental validation of wind resistance
Black: CalRed: Exp
Black: CalRed: Exp
Black: CalRed: Exp
China Ship Scientific Research Center 16
China’s research activities on MPP
Model tests of seakeeping performance in regular waves
The model test of added resistance in waves at low speed for morethan 30 tankers and bulks has been completed.
China Ship Scientific Research Center 17
China’s research activities on MPP
Statistical analysis of assessment Level-1 for Minimum Propulsion Power
0 4 8 12 16 20 24 28 32 36 40 440
4000
8000
12000
16000
20000
24000
28000
32000
36000
Power
DWT
Minimum Power Line(Before MEPC68) Minimum Power Line(MEPC68) Bulk Carrier
0 4 8 12 16 20 24 28 32 360
5000
10000
15000
20000
25000
30000
DWT
Powe
r
Minimum Power Line(Before MEPC 68) Minimum Power Line(MEPC 68) Tanker
More and more tankers and bulk under 200 deadweight tons cannot satisfy the assessment Level-1.
China Ship Scientific Research Center 18
China’s research activities on MPP
Depth analysis of assessment Level-2 for new designed ships
Most of the new designed ships could satisfy the assessment Level-2by conducting model tests according to the Interim Guidelines.
China Ship Scientific Research Center 19
China’s research activities on MPP
Innovative energy efficiency technology — Air Lubrication System
Conceptual design:
Large-scale model test and sea trial:
Conclusion: energy saving efficiency is about 7%.
China Ship Scientific Research Center 20
China’s research activities on MPP
Innovative energy efficiency technology — Wind Propulsion System
3.13%
1.39%
4.18%
7.64%6.95%
5.87% 5.62%
7.76%
10.04%
5.93%
0%
2%
4%
6%
8%
10%
12%
1 2 3 4 5 6 7 8 9 10
Numerical Simulation Large-scale Model Test
Energy Saving Efficiency
China proposed amendments to the 2013 Interim Guidelines for determiningminimum propulsion power to maintain the manoeuvrability of ships in adverseconditions in the following aspects:.1 China is of the view that the value of thrust deduction factor should beobtained from required ship advance speed, while the Interim Guidelinesseemingly estimate it with design speed, which is overestimated..2 China also proposes a classical numerical method to calculate wave addedresistance, can be used as an alternative option to obtain wave addedresistance in the Interim Guidelines.
China Ship Scientific Research Center 21
China’s research activities on MPP
China’s proposals on MPP at MEPCsMEPC 71 (2017)
Based on in-depth research, China proposed amendments to the 2013 InterimGuidelines for determining minimum propulsion power to maintain themanoeuvrability of ships in adverse conditions in the following aspects:.1 According to the results of self-propulsion test at low speeds, the values ofthrust deduction factor and wake fraction obtained from the model test arefairly lower than these obtained from the Interim Guidelines..2 China proposed a new numerical method for calculating quadratic transfer function of the added resistance in regular waves.
China Ship Scientific Research Center 22
China’s research activities on MPP
China’s proposals on MPP at MEPCsMEPC 72 (2018)
1 2 3 4 5 6 7 80.00
0.05
0.10
0.15
0.20
0.25
0.30
Resu
lts o
f wak
e fra
ctio
n an
d th
rust
ded
uctio
n o
btai
ned
from
mod
del t
ests
Ship speed(knot)
wake fraction thrust deduction
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.00.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8VLCCship speed:6.3knots Cal
Exp
R aw/ζ a2
λ/Lpp
China Ship Scientific Research Center 23
Summary
PART THREE
3
1. With the adoption of Initial IMO Strategy on Reduction of GHG Emissions from
Ships, the requirement of EEDI will become more and more stringent, resulting in
more obvious conflict between EEDI and MPP, and this is a great challenge for
global shipbuilding industry.
2. China has the ability to participate in the formulation of energy efficiency and
safety operation rules for ships, and is willing to develop technical cooperation
with any other States around the world.
3. Innovative energy efficiency technologies could become a solution to GHG
emission reduction target, and research on alternative low-carbon and zero-
carbon fuels as well as Market-based Measures also very important.
China Ship Scientific Research Center 24
Summary
Summary
THANKSFOR YOUR ATTENTION!
Your true partner in maritime
CSSRC
E-mail: [email protected]
http://www.cssrc.com.cn
Q&A
Top Related