低水动力自噪声的头体线型优化设计方法  

Approaches for optimized design of the head form with low hydro-dynamical self-noise

作　　者：唐科范[1] 柳康宁[1] 

机构地区：[1]上海交通大学工程力学系,上海200240

出　　处：《水动力学研究与进展（A辑）》2009年第2期180-189,共10页Chinese Journal of Hydrodynamics

基　　金：上海市重点学科建设项目资助;项目编号:B206

摘　　要：本文阐述了一套低水动力自噪声的头体线型优化设计方法,即通过优化设计水下航行体的头部线型,在保证无空化航行的前提下,降低头体边界层流动对其前驻点位置的水动力自噪声干扰。这种头体线型优化设计方法,首先利用自噪声频谱的相似规律,结合已有理论分析和实验测试结果对轴对称回转体的水动力自噪声频谱进行数值预报;然后以该自噪声声压谱级为目标函数,结合工程实际中的约束条件,进行头体几何参数的多参数寻优。这种优化设计方法能以较小的计算量获得较高精度的关键频率处的自噪声声压谱级预报和相应的低噪声头体线型优化设计,从而具备广泛工程应用的可行性。本文中所列的典型算例显示,经过线型优化设计的头型具有比原型显著降低的自噪声。A set of approaches for optimizing the design of the head form with low hydro-dynamical noise is described in this paper. It is to reduce the self-noise generated by its boundary layer at the stagnation position of the head form in non cavitating flow. This optimization method is firstly to numerically predict the hydro-dynamical self-noise spectrum on the axisymmetric bodies, by using the similarity law of the self-noise spectrum and some other theoretical and experimental results. Then it puts forward a multi parameter optimization of geometric parameters of the head form, considering the sound pressure spectral level of the self-noise as the objective function under the constraint conditions from the engineering practice. It is shown that the described method is feasible for a widely engineering application because of its small computational cost and quite accurate prediction of sound pressure spectral level of the self-noise at the key frequency. From the typical examples in this paper, it shows that the self-noise on the optimized head forms is obviously lower than that from the initial shapes.

关 键 词：水动力噪声 自噪声 头体线型 优化设计 

分 类 号：U661.1[交通运输工程—船舶及航道工程] O427.5[交通运输工程—船舶与海洋工程]