30 November 2008

[yim036] DMV_Ch.11_Powering in a Seaway

This is the Chapter 11 - Powering in a Seaway

The main objective in the design of marine vehicle is the capability to sustain speed in a seaway. Traditionally, designer shall determined allowance 15-30% from still water performance, for wind and waves. Loss of speed of vessel in a seaway is not always due to the added resistance, the speed is often voluntary reduced in order to decrease the violent heaving and pitching motion of the vessel which caused slamming, excessive shipping of green water, high accelaration and propeller racing.

Content

11.1 General
11.2 Added Resistance in Regular Waves
11.3 Experiment in Reqular Waves
11.4 Added Resistance in Irregular Waves
11.5 Propeller Open Water Tests in Waves
11.6 Self Propulsion Factors
11.7 Thrust and Torque Irregular Waves
11.8 Prediction of Added Power
1. Direct Power Method
2. Torque - Revolution per Minute Method
3. Thrust Method
11.9 Effect of Rolling
11.10 Power Increase due to Wind and Waves
11.11 General Conclusion about Speed Reduction

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

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