论文部分内容阅读
任何船舶在运动过程中其机械设备的运转,以及船体本身的运动,都不可避免地会产生噪声,这种噪声在水中向周围传播,就在水下形成了随时间和空间分布的船舶辐射噪声场。由于船舶体积庞大、设备众多,在近场是一个十分复杂的体积声源,其声场具有时、空变化特性和指向性,在测量船舶水下辐射噪声时,为保证获得足够的信噪比,通常只能在近距离进行测量。因此开展船舶体积声源的建模研究,是十分重要和必要的。为了验证浅海波导条件下的船舶辐射噪声源模型,在某浅海海域,测量了一艘渔政船的辐射噪声。实测数据的处理结果验证了船舶辐射噪声源模型的有效性,即利用建立的船舶辐射噪声源模型可有效地描述体积声源的声场分布。该研究成果对于分析船舶目标的固有特性具有指导意义。
The operation of any ship during its movement and the movement of the hull itself inevitably produce noise which propagates to the surroundings in the water and forms the ship's radiated noise over time and in space field. Due to its size and equipment, the vessel is a very complicated volume source in the near field. Its sound field has the characteristics of time and space variation and directivity. In order to obtain sufficient signal-to-noise ratio when measuring underwater radiation noise of a ship, Usually only at close range measurements. Therefore, it is very important and necessary to carry out modeling research on sound source of ship volume. In order to verify the ship radiation noise source model in shallow seaguides, the radiation noise of a fishery ship was measured in a shallow sea area. The processing results of the measured data verify the effectiveness of the radiated noise source model of the ship, that is, the sound field distribution of the bulk sound source can be effectively described by using the established ship radiated noise source model. The research results are instructive for analyzing the inherent characteristics of ship targets.