License & Copyright iii
Contents. v
About this Manual 1
Chapter 1 Introduction. 2
Seakeeping
Fundamentals. 3
Coordinate
System.. 4
Wave
Spectra. 5
Characterising
Vessel Response. 7
Calculating
Vessel Motions. 8
Statistical
Measures. 8
Computational
Methods. 8
Visualisation. 9
Chapter 2 Using Seakeeper 11
Getting
Started. 11
Opening a
Model in Seakeeper 11
Additional
Hull Parameters. 15
Specifying
Remote Locations. 17
Environmental
Parameters. 19
Completing
the Analysis. 22
Viewing
the Results. 25
Graphing
the Results. 30
Rendered
view.. 33
Time
Simulation and Animation. 37
Saving
the Seakeeper Model 39
Saving
the Seakeeping Analysis Results. 39
Limitations
and Guidelines. 40
Chapter 3 Seakeeper Reference. 43
Windows. 44
Toolbars. 47
Menus. 49
File Menu. 49
Edit Menu. 50
View Menu. 50
Analysis
Menu. 51
Display
Menu. 52
Data Menu. 52
Window
Menu. 53
Help Menu. 53
Chapter 4 Theoretical Reference. 55
Seakeeping
Theory. 56
Wave
Spectra Theory. 56
What the
Vessel Sees. 61
Characterising
Vessel Response. 62
Calculating
Vessel Motions. 65
Statistical
Measures. 66
Probability
Measures. 67
Calculation
of Subjective Magnitude and Motion Sickness Incidence. 68
Speed
Loss. 71
Glossary. 73
Nomenclature. 74
Bibliography
and References. 76
Appendix A Strip Theory Formulation. 80
Calculation
of coupled heave and pitch motions. 81
Heave and
Pitch Motion of a Vessel in a Seaway. 81
Solution
of Coupled Heave and Pitch Motions. 82
Global
Added Mass and Damping (Strip Theory) 83
Wave
Excitation Force and Moment 85
Arbitrary
Wave Heading. 85
Diffraction
Force. 86
Froude-Krilov
Force. 86
Head Seas
Approximation. 87
Salvesen
et al. (1970) Approximation. 87
Wave
Attenuation (Smith Effect) 88
Added
Resistance of a Vessel in a Seaway. 88
2D Ship
Sections. 89
Calculation
of Added Mass and Damping of 2D Ship Sections. 90
Calculation
of multipole expansion coefficients. 90
Least
squares solution to over-defined set of linear equations. 91
Calculation
and integration of pressure functions around contour 91
Evaluation
of hydrodynamic coefficients. 92
Checking
the solution. 93
Important
notes. 93
Added
Mass at Infinite Frequency. 93
Non-Dimensional
Damping Coefficient 93
Non-Dimensional
Added Mass. 94
Non-Dimensional
Frequency. 94
Representation
of Ship-Like Sections by Conformal Mapping. 94
Derivative
of Conformal Mapping. 96
Shear
Force and Bending Moment due to Ship Motion in a Seaway. 96
Inertial
Component 96
Hydrostatic
(Restoring) Component 97
Wave
Excitation Component 98
Hydrodynamic
Component 98
Calculation
of uncoupled roll motion. 100
Equation
of motion for roll 100
Appendix B Validation. 105
Seakeeper
Validation 1. 106
Introduction. 106
Analysis
Procedure. 107
Results. 107
Slow
Speed. 107
Moderate
Speed. 108
High
Speed. 108
Conclusions. 108
References. 109
Figures. 109
Seakeeper
Validation 2. 128
Introduction. 128
Analysis
Procedure. 128
Results. 129
Conclusions. 129
References. 129
Figures. 130
Index. 133