3 Environmental Data...................................................................... 16
3.1 General............................................................................ 16
3.3 Special Wave Data Needs...............................................16
SECTION 4 Analysis of Ship Motions, Wave Loads, and Extreme Values....... 17
1 Overview.......................................................................................17
3 Still-water Loads........................................................................... 17
5 Essential Features of Spectral-based Analysis of Motions
and Loads.....................................................................................17
5.1 General Modeling Considerations................................... 17
5.3 Diffraction-Radiation Methods......................................... 17
5.5 Panel Model Development...............................................18
5.7 Ship Motion and Wave Load Response Amplitude
Operators.........................................................................18
7 Extreme Values Analysis.............................................................. 18
7.1 Short-term Statistics........................................................ 18
7.3 Spectral Moment of Response........................................ 19
7.5 Long-term Statistics......................................................... 20
7.7 Characteristic Values....................................................... 21
7.9 Extreme Value from Model Test Data.............................. 21
FIGURE 1 ............................................................................................. 19
SECTION 5 Equivalent Design Waves..................................................................24
1 General.........................................................................................24
3 Equivalent Wave Amplitude..........................................................24
5 Wave Frequency and Heading..................................................... 24
FIGURE 1 Equivalent Wave Amplitude................................................. 25
SECTION 6 Nonlinear Seakeeping Analysis........................................................26
1 General.........................................................................................26
3 Nonlinear Seakeeping Analysis.................................................... 26
5 Modeling Consideration................................................................ 26
5.1 Mathematical Model.........................................................26
5.3 Numerical Course-keeping Model................................... 27
7 Nonlinear Instantaneous Load Components................................ 27
SECTION 7 External Pressure.............................................................................. 29
1 General.........................................................................................29
3 External Pressure Components ...................................................29
5 Pressures Accompanying the Dominant Load Component
and Their Distribution....................................................................29
ABS GUIDANCE NOTES ON STRUCTURAL DIRECT ANALYSIS FOR HIGH-SPEED CRAFT • 2022 iv