To study new type of underwater energy-accumulated torpedo launcher, its mathematical mode is built. Its structure and interior ballistic parameters are optimized by using genetic algorithm. For several parameters and their different units and magnitudes, normalization is applied to transfer multi-objective optimization to single-object optimization, and penalty function method is used to deal with restriction condition. The optimization results show that the optimized structure parameters meet the requirements of launching well and the launcher has small volume, light weight and better interior ballistic performance.
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