不等间距分舱结构声辐射特性研究

发布时间：2018-03-06 13:23

  本文选题：结构声学　切入点：优化设计　出处：《船舶力学》2016年08期 　论文类型：期刊论文

【摘要】：研究舱段结构振动、声辐射特性随分舱形式改变的变化规律,对潜艇结构声学优化设计具有十分重要的意义。从结构声学设计的角度出发,在保持相邻两个舱段总长度不变的情况下,调整两个舱段的长度,采用结构有限元法、结构有限元耦合流体边界元方法,以辐射声功率、湿表面均方法向速度和辐射效率作为衡量结构噪声辐射能力的主要衡量指标,系统地研究整个结构振动和声辐射特性。在流体部分的计算中,采用网格重叠算法,以提高计算效率。通过调整分舱形式,在一定频段,改变了整个舱段结构振动声学传递函数的谱峰频率,降低了谱峰幅值,因此,可以通过改变分舱形式以改变舱段结构声学特性,使设备激振力的谱峰频率与结构振动声学传递函数的谱峰频率错开,实现对辐射噪声的控制。
[Abstract]:It is very important to study the variation of the vibration and acoustic radiation characteristics of the cabin structure with the subdivision form, which is of great significance to the optimization design of the submarine structure, from the point of view of the structural acoustic design, Under the condition of keeping the total length of the adjacent two segments unchanged, the length of the two segments is adjusted, and the structural finite element method and the structural finite element coupled fluid boundary element method are used to radiate sound power. The velocity and radiation efficiency of the wet surface averaging method are used as the main indexes to measure the radiation capacity of the structure noise. The vibration and acoustic radiation characteristics of the whole structure are systematically studied. In the calculation of the fluid part, the mesh overlap algorithm is used. In order to improve the calculation efficiency, by adjusting the form of subdivision, in a certain frequency range, the spectrum peak frequency of acoustic transfer function of vibration of the whole cabin structure is changed, and the amplitude of spectrum peak is reduced. By changing the subdivision form to change the acoustic characteristics of the cabin structure, the spectrum peak frequency of the excitation force of the equipment and the spectrum peak frequency of the acoustic transfer function of the structural vibration can be staggered to realize the control of the radiated noise.
【作者单位】： 海军工程大学舰船工程系;
【基金】：*****演示验证项目(*2011001/101)
【分类号】：U661.44
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本文编号：1575007