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Fig. 4. Quadratic frequency transfer functions of wave forces at θ=45°
 
Surge Force
 
Sway Fource
 
Yaw Moment
 
Fig. 5. ISSC spectrun(H1/3=0.05m, Tmean=3.14sec)
 
 Figure 4 is the quadratic frequency transfer function of wave forces at the incident angle θ=45°. Next, the irregular waves for the calculation is produced from the equation (2), based on the ISSC spectrum of Figure 5.
 
 
 Here, S(ωi) is the i th component of spectrum, Δω is the difference between the neighboring frequencies.
 
Fig. 6. Quadratic impulse response functions at θ=45°
 
Surge Force
 
Sway Force
 
Yaw Moment







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