Dynamic characteristics of hull propeller engine net matching of double speed ratio fishing vessel
                                               HUANG Wen chao1,2, HUANG Wen yun1,2, ZHAO Xin ying1,2
(1.Key Laboratory of Ocean Fishing Vessel and Equipment, Ministry of Agriculture, Shanghai 200092, China;2.Fishery Machinery and Instrument Research Institute, Chinese Academy of Fishery Science, Shanghai 200092, China)

Abstract: Aiming at the problem of the fishing vessels dynamic characteristics influencing the vessels reliability and economy when the engine and propellers working point changes under trawling condition, research was done on the vessels speed, torque, power and other dynamic characteristics under normal and trawling condition . Based on hull propeller engine net matching theory, through the numerical fitting of propeller characteristic curve, Chebyshev poly nomial analytical form was built up which is suitable for digital simulation research, and the double speed ratio trawler s hull propeller engine net models based on AMESim were set up, simulation research was done on double ratio fishing vessel s operation characteristics under multi condition. The results indicate that double speed ratio propulsion mode can reduce main engine s torque and power while it keeps its rated speed in trawling condition, which improves the reliability and economy effectively, and that the hull propeller engine net matching modeling simulation research results are very close to the actual vessel s operation condition.

Key words: AMESim; double speed ratio; hull propeller engine net matching