论文部分内容阅读
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50～300Hz频段内平均降低了3.6dB。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。
In order to reduce the vibration and noise of the hull, a finite element model of the composite cylindrical shell was established, and its underwater vibration and acoustic radiation characteristics were studied. Based on this, the optimization model of underwater acoustic radiation of composite cylindrical shell is analyzed. Based on genetic optimization algorithm, taking the angle of composite ply as design variable and the maximum of sound pressure in fluid-solid coupling surface as optimization objective, Optimized analysis. The results show that the optimized design of the composite shell can effectively improve the sound radiation performance. Compared with the symmetrical ply mode, the optimized far-field radiation sound pressure level is reduced by 3.6dB in the frequency band of 50 ~ 300Hz . The results validate the effectiveness of the optimization design and provide some ideas for the next research on acoustic radiation optimization of large and complex underwater structures.