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  An engine room simulator was developed to simulate the behaviors of a 2700 TEU container ship under different performance failures and different running conditions. This paper introduces the mathematical models of the main diesel engine including chamber combustion model, variable injection timing model and hull-propeller-engine model. A real time simulation algorithm is described to meet the demands of rapid response, long running duration and little error accumulation of the simulator. Typical performance failures, structural faults and boundary conditions of main engine were simulated and their simulation models are briefly mentioned in this paper. Seafarersoperation to the simulated failures can be assessed and operation-assessing algorithm is also introduced in this paper.……   
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