Read the full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=49686 DOI: 10.4236/jpee.2014.29005 Author(s) Menglin Shao, Qianchao Liang, Dong Yan, Heng Qin, Jun Xiang Affiliation(s) The College of Naval, University of Engineering, Wuhan, China. The College of Naval, University of Engineering, Wuhan, China. The College of Naval, University of Engineering, Wuhan, China. The DaLain Naval Vessel Academy, Dalian, China. The DaLain Naval Vessel Academy, Dalian, China. ABSTRACT A fuzzy comprehensive evaluation of COGAG power plant performance is given by using a method of fuzzy mathematics, and multilevel fuzzy evaluation model is set up. Taking a naval ship as an example, the major parameters related to COGAG power plant performance are obtained by computer simulation, and a set of synthetic performance evaluation index system is established. The result shows that the strong fuzzy propulsion system performance indexes can be quantified by this fuzzy evaluation model in order to provide the reference for choosing the optimal design of ship propulsion system.gjreww140917 KEYWORDS COGAG Power Plant, Fuzzy Comprehensive Evaluation, Performance Index