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| Analysis of the Ship Speed Loss Coefficient Based on Hull-Engine-Propeller Matching and Wave Statistics |
| FENG Pei-Yuan-a, MA Ning-a, b , GU Jie-Chong-a, b |
| (a. School of Naval Architecture, Ocean and Civil Engineering; b. State Key Laboratory of Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract In order to reduce green-house-gas emission, international maritime organization (IMO) proposed the energy efficiency design index (EEDI) regulation, but has not specified the procedure for calculating the speed loss coefficient. Therefore, this paper aims at analyzing and proposing a calculation process based on hullenginepropeller matching and longterm wave statistics to estimate this speed loss coefficient. The proposed method takes into account the energy transmission among hull, engine and propeller as well as their hydrodynamic interactions; on addition, longterm wave statistics of the ship’s operational regions are adopted as environment input, thus making the current method more objective and realistic. Calculation is performed to a containership in operation and the result is compared with IMO reference value, the regression formula of China ship scientific research center and the widely used NMRI approach. The result obtained by the current method shows the same trend as the NMRI method while being more conservative. Therefore, using the current method to guide ship energy efficiency design can better guarantee the navigation performance of the ship at actual seas.
Key words：
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Received: 03 November 2011
Published: 31 August 2012
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