Research Activities on Minimum Propulsion Power (MPP

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


Introduction

PART ONE

1


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


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


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


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?


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’s research activities on MPP

PART TWO

2



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



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



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



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



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



Numerical prediction and experimental validation of wind resistance

Black: CalRed: Exp

Black: CalRed: Exp

Black: CalRed: Exp



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.



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.



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.



Innovative energy efficiency technology — Air Lubrication System

Conceptual design:

Large-scale model test and sea trial:

Conclusion: energy saving efficiency is about 7%.



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’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’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


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.


Summary

Summary

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Research Activities on Minimum Propulsion Power (MPP