Structural Responses (Stress, Strain and Displacement)
Yielding, Buckling and Fatigue Code Checks
Load Mapping Process 3D Hydrodynamic Panel Model
Hydrodynamic Analysis Program
Load Condition Definitions Wave Direction Wave Period Phase Angle
Motion and Load Response RAOs
Aqwa Hydrodynamic Database
AQWA WAVE
ANSYS Mechanical Model
Load Transfer Requirements Hydrodynamic model Structural model
Definition of required wave cases to transfer
Load Transfer Requirements Pressure Mapping •
Free floating body, therefore no explicit boundary conditions
•
Wave pressure should be balanced by inertial loading
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Important that mass information used in Aqwa is the same as that computed from the structural model Mass inertia information may be checked from the structural model ***********
PRECISE MASS SUMMARY
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TOTAL MASS (X,Y,Z)= 0.30039E+08 0.30039E+08 0.30039E+08 MOMENTS AND PRODUCTS OF INERTIA TENSOR (I) ABOUT ORIGIN (GLOBAL CARTESIAN) 0.10717E+10-0.81854E+07-0.11227E+06 -0.81854E+08 0.24025E+10 -49530. -0.11227E+06 -49530. 0.14226E+10 CENTER OF MASS (X,Y,Z)= 0.91020
0.95273
26.619
MOMENTS AND PRODUCTS OF INERTIA TENSOR (I) ABOUT CENTER OF MASS (GLOBAL CARTESIAN) 0.45005E+10-0.80984E+07 0.24211E+07 -0.80984E+07 0.36903E+10 0.25410E+07 0.24211E+07 0.25410E+07 0.34224E+10 PRINCIPAL CENTROIDAL MOMENTS OF INERTIA= 0.45010E+10 0.36852E+10 0.34224E+10
Load Transfer Requirements Panel pressures are extracted from database P1
N1
P2
P5 P6
N2
Nodal values are computed from weighted averaging of pressures of connected panels
P3
P7
P4
Finite element nodal pressures computed from weighted averaging of hydrodynamic nodal values
N1
N3
N2
N4
Structural Analysis
Structural Mesh
Structural Analysis Hull definition •
Pressure mapping is for outer hull only, therefore we need to define this
We make use of named selections, or use graphical selection, to define the outer hull
A dummy pressure load is applied to the outer hull to identify the panels to be hydrodynamically loaded
Structural Analysis Free floating body analysis Global Structural FE Model
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ANSYS Mechanical offers two facilities to undertake a free floating model analysis •
