30 November 2008

[yim036] DMV_Ch.6_Motion in an Irregular Seaways

The Response of ship in an irregular seaway follows the same statistical laws as do the waves. Records of ship responses show patterns similar to those of wave records. Therefore, instead of having a graph for the square of each component wave component wave amplitude as a function of frequency, one can have a graph of the square of the rolling (or any other motion) amplitude that the particular wave component of that amplitude and frequency would produce. The resulting spectrum known as the response spectrum will give similar statistical properties to those obtained in the case of sea waves. Energy Spectrum method is utilized.

Content

6.1 Response in an Irregular Seaway
6.2 Prediction an Irregular Seaway
Step 1. Selecting A Standard wave Spectrum
Step 2. Transforming wave spectrum into, called it, encountered wave spectrum
Step 3. Calculating ratio of rolling amplitude and wave amplitude
Step 4. Determining Response Amplitude Operators (RAO)
Step 5. Calculating ship response using linear superposition technique
Step 6. Ploting significant of the motion spectrum,
6.3 Extreme Value of Motion Amplitude
Extreme Value as a Function of Time


Dynamics of Marine Vehicles
By Rameswar Bhattacharyya
Published by Wiley, 1978
ISBN 0471072060, 9780471072060

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