舰船结构声学设计及噪声预报技术探讨

Research on acoustic design of warship structure and prediction of underwater noise

为了探索舰船结构声学设计及噪声预报技术,根据振动传递及水下噪声原理,分析了舰船噪声预报的3个重要环节:机械设备的激励特性、舰船结构的振动传递特性以及船体的水下声辐射特性.以国外某舰船为背景,选择典型柴油主机作为激励源,采用有限元/边界元方法,得到基座与船体外板的振动分布与水下噪声.通过模拟各种结构与材料方案,研究了舰船的水下噪声,提出了舰船结构声学设计中的若干重要方面.

To research the acoustic design and noise prediction of the warship, three keys are analyzed based on the theory of vibration transmission and underwater noise, namely the excitation characteristics of the power equipment, the vibration transmission of ship＇s structure and the radiation of underwater noise from the hull structure. A foreign warship is chosen as the research object with typical diesel engines as excitation sources. By using the finite element method and the boundary element method, the vibration distribution on the ship＇s outer plate and the underwater noise are obtained. Through the simulation of both the structure and materials, the technique of acoustic design and the prediction of underwater noise of the warship are discussed, and some important aspects of the acoustic design are put forward.