基于遗传算法的复合材料圆柱壳水下声辐射优化

摘要

In order to reduce the vibration and noise of submarines ,a FEM model of composite lami-nated cylindrical shell is established .The model is used for the investigation into its underwater vibra-tion and sound radiation .Based on the genetic algorithm (GA) ,the structural-acoustical optimization model is presented ,with the angle of laminated layers as design variable and the maximum sound pressure on the coupled interface as an object of optimization .The result shows that the optimizing design of the angle of the composite laminated cylindrical shell can improve its sound radiation effec-tively ,compared with the symmetrical laminated angle .The optimized far-field pressure level reduces 3 .6 dB on average in the frequency band of 50 Hz to 300 Hz .Therefore ,this optical design can pro-vide a certain reference for further study of the optimization of sound radiation from a large complex underwater structure .%为了降低艇体的振动噪声，建立了复合材料圆柱壳的有限元模型，并对其水下振动和声辐射特性进行了研究。在此基础上，分析了复合材料圆柱壳水下声辐射的优化模型；基于遗传优化算法，以复合材料铺层角度为设计变量，以流固耦合面内辐射声压的最大值为优化目标，进行了优化分析。结果表明：对复合材料圆柱壳的铺层角度进行优化设计可以有效提高其声辐射性能，相比对称铺层方式，优化后的远场辐射声压级在50～300 Hz频段内平均降低了3．6 dB。该结果验证了优化设计的有效性，为下一步进行大型复杂水下结构的声辐射优化研究提供了一定的思路。