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Principle of Conversion from time domain to frequency domain 

Principle of Conversion from time domain to frequency domain 

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Seakeeping analysis is important in assessing the performance of floating structure in waves. To perform Seakeeping calculations, the wave characteristics as well as the response of the vessel are needed. The analysis normally requires reliable computer programs to calculate response amplitude operator (RAO) and accurate seaway representation. For...

Contexts in source publication

Context 1
... Figure 9 it is clearly visible that the roll motion is higher in Beam Sea, which is usual but the heave response is less in this plot. In Figure 10 the pitch response is higher in bow quartering and head sea. From figure 9 &10 one thing can be noted. ...
Context 2
... the energy in roll motion is less than that of in pitch. Figure 11 and 12 shows that the RAO for Heave and Roll are quite consistent. Overall they are acceptable. ...
Context 3
... peak frequency of these RAO shows the natural frequency for heave, pitch and roll. From the RAO curve it clear that the RAO for Heave and roll in head and beam sea is high as seen in Figure 11 and 12. From here the result is clear-cut. But from figure 13 it is visible that the Pitch RAO is not consistent. ...

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This paper presented a new design for the unmanned surface vessel (USV) platform with a self-manoeuvring system which is capable of collecting the same data as a hydrography boat. This platform was designed with three hulls that were placed in triangle position. The hulls designed were in the form of rudders-shape and were vertically placed as a slender body shape using NACA 64-0012 profile. This provides the USV with low-drag characteristic. The application of stability and resistance theories investigated the effect of the configuration position of the three hulls for this platform. The results revealed that a larger configuration distance between the three hulls will lead to a reduction in resistance and the platform will be in highly stable condition. The relationships derived from these findings should produce a stable and low-drag platform to accomplish the design concept of three rudders-shaped like body in columns for low-drag USV. This concept may help us to accomplish the design requirements that are related to low-drag and minimum power operation.