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  • Previous sailing yachts seakeeping

    investigation in view of a new set of rules

    Adrien Combourieu

    Academic Supervisor: Prof. Dario Boote, UNIGE

    Industrial Supervisor: Flavio Faloci, RINA

    External Reviewer: Prof. Leonard Domnisoru, UGAL

    La Spezia, 25th of January 2013

  • Contents

    Introduction

    Method for quick pitch RAO estimation

    State-of-the-art method for motion in irregular sea prevision

    Conclusions

    Erasmus Master Course in Advanced Ship Design

    3

    25/01/13

  • Introduction - Objectives

    Yacht dismasting investigation

    Seakeeping => inertial loads

    Acceleration mainly due to pitch

    Hydrostar: potential seakeeping code in frequency domain (BV)

    Classification society => quick method

    Key parameters?

    25/01/13 Erasmus Master Course in Advanced Ship Design

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  • Introduction Database

    25/01/13 Erasmus Master Course in Advanced Ship Design

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    7 modern sailing boat hulls

    name LOA (m)

    Lwl (m)

    B (m)

    T canoe (m)

    Displacement (kg)

    ballast mass (kg)

    kyy (m)

    SW 31.3 30.4 6.8 1.08 83856 18700 8.70

    swan 90 26.8 24.9 6.6 0.95 56726 18400 7.08

    oyster 82 24.8 20.9 6.3 1.29 61085 20243 6.33

    swan 66 20.3 17.8 5.4 0.90 31030 9400 5.37

    ref2 14.5 12.8 4.3 0.66 12877 4507 3.63

    AME004 11.3 10.3 3.1 0.44 5381 1883 2.79

    J80 8.0 7.0 2.5 0.34 1825 635 2.11

  • 25/01/13 Erasmus Master Course in Advanced Ship Design

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    Waterline length Lwl

    Method for quick pitch RAO estimation

  • Method for quick pitch RAO estimation

    RAO: 2 representations

    25/01/13 Erasmus Master Course in Advanced Ship Design

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    0 10 20 30 40 50 60 70 80 900

    0.2

    0.4

    0.6

    0.8

    1

    amplitude pitch.rao

    lambda (m)

    pitch.r

    ao(r

    ad/r

    ad)

    180

    0 0.1 0.2 0.3 0.4 0.5 0.6 0.70

    2

    4

    6

    8

    10

    12

    14amplitude pitch.rao

    f (Hz)

    pitch.r

    ao

    (

    deg/m )

    180

    L1

    L0

    f0 f1 fres

    pmax

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    8

    >L1

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    9

    Regression on 7 hulls

    res = 1.2485Lwl + 0.0331 R = 0.9909

    0

    5

    10

    15

    20

    25

    30

    35

    40

    45

    0,00 10,00 20,00 30,00 40,00

    re

    s (m

    )

    Lwl (m)

    res

    Linaire (res)

    fres = 1.118/sqrt(Lwl)

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    10

    Regression on 7 hulls

    fres = 1.118/sqrt(Lwl)

    pmax = 39.985e-0.06Lwl

    y = 39.985e-0.06x

    R = 0.9728 0,00

    5,00

    10,00

    15,00

    20,00

    25,00

    30,00

    35,00

    0,00 10,00 20,00 30,00 40,00

    ma

    xim

    um

    pit

    ch a

    mp

    litu

    de

    ()

    waterline length (m)

    pitch max

    Expon. (pitch max)

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    11

    Regression on 7 hulls

    fres = 1.118/sqrt(Lwl)

    pmax = 39.985e-0.06Lwl

    y = 0,4287x + 0,6819

    R = 0,9883

    0

    2

    4

    6

    8

    10

    12

    14

    16

    0,00 10,00 20,00 30,00 40,00

    0

    (m

    )

    Lwl (m)

    0(5%)

    Linaire (0(5%))

    L0 = 0.429Lwl

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    12

    Regression on 7 hulls

    fres = 1.118/sqrt(Lwl)

    pmax = 39.985e-0.06Lwl

    y = 2,4512x - 6,5245

    R = 0,8352 0

    10

    20

    30

    40

    50

    60

    70

    80

    90

    0,00 10,00 20,00 30,00 40,00

    1

    (m

    )

    Lwl (m)

    1 (95%)

    Linaire (1 (95%))

    L0 = 0.429Lwl

    L1 = 2.5Lwl

  • Method for quick pitch RAO estimation

    25/01/13 Erasmus Master Course in Advanced Ship Design

    13

    Results on Kiboko

    0 0.1 0.2 0.3 0.4 0.5 0.60

    1

    2

    3

    4

    5

    6

    7

    8

    amplitude pitch.rao

    f (Hz)

    pitch.r

    ao

    (

    deg/m )

    180

  • Pitch in irregular sea

    25/01/13 Erasmus Master Course in Advanced Ship Design

    14

    0 0.1 0.2 0.3 0.4 0.5 0.6 0.70

    2

    4

    6

    8

    10

    12

    14amplitude pitch.rao

    f (Hz)

    pitch.r

    ao

    (

    deg/m )

    180

    X

    2

    Frequency domain

  • Pitch in irregular sea

    25/01/13 Erasmus Master Course in Advanced Ship Design

    15

    Time domain

    0 5 10 15 20 25 30 35-0.2

    -0.15

    -0.1

    -0.05

    0

    0.05

    0.1

    0.15

    0.2

    0.25wave time serie

    t (s)

    Wave a

    mplit

    ude (

    m)

    0 5 10 15 20 25 30 35

    -3

    -2

    -1

    0

    1

    2

    3

    pitch.rao time serie

    t (s)

    deg/m

    *m

  • Pitch in irregular sea

    25/01/13 Erasmus Master Course in Advanced Ship Design

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    Comparison with experimental results for J80

    In pure front waves

    speed = 5 knots.

    Hs=0.3m

    Tp = 2.251s

    =3.3 (closed basin)

    No heel angle

    Augier, B., Bot, P., Hauville, F., Durand, M., (2012), Experimental validation of unsteady models for fluid structure interaction: Application to yacht sails and rigs. Journal of Wind Engineering and Industrial Aerodynamics, 101 (2012), pp 5366

    Experimental

    Numerical

  • Pitch in irregular sea

    25/01/13 Erasmus Master Course in Advanced Ship Design

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    Results for kiboko in irregular head sea without speed

    Numerical

    Empirical

  • Conclusion

    25/01/13 Erasmus Master Course in Advanced Ship Design

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    Critical parameters: Lwl, kyy, V, stern (bow) shape, heading

    Simplified method for head sea without forward speed using only

    Lwl. To be improved taking into account more parameters.

    Regression on bigger database

    Method for pitch prediction in function of wind speed to be

    compared with experimental results

  • Thank you for your attention

    Questions ?

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