Analysis of the Ship Speed Loss Coefficient Based on Hull-Engine-Propeller Matching and Wave Statistics

Abstract

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 hullenginepropeller matching and longterm 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, longterm 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：

Key words: energy efficiency design index (EEDI), speed loss coefficient, hull-engine-propeller matching, wave statistics

CLC Number:

U 662.1

FENG Pei-Yuan-a, MA Ning-a, b , GU Jie-Chong-a, b . Analysis of the Ship Speed Loss Coefficient Based on Hull-Engine-Propeller Matching and Wave Statistics[J]. Journal of Shanghai Jiaotong University, 2012, 46(08): 1248-1253.

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