电机舱段圆柱壳体振动声辐射研究
发布时间：2018-07-31 17:27
【摘要】：电机舱段圆柱壳体是水下航行器(鱼雷、潜艇等)的基本结构形式,研究它的振动和声辐射特性有助于揭示航行器噪声辐射的机理,对提高其在水中的隐蔽性和进行低噪声声学设计有着重要的意义。本论文以水下航行器电机舱段圆柱壳体的振动及噪声辐射为背景,采用试验与数值仿真相结合的方法对空气中电机舱段壳体结构的振动及声辐射特性进行了分析,并研究了环肋、阻尼和激励力等因素对圆柱壳体结构振动和声辐射的影响。 对圆柱壳体简单模型在空气中进行单点力激励试验,并利用有限元、流体边界元法对该模型进行仿真分析,计算得到的噪声辐射与试验测量结果吻合,表明本文数值分析方法是正确的。采用有限元、流体边界元法作为研究圆柱壳体结构振动与声辐射的基础,对加肋壳体模型的振动声辐射特性进行研究,讨论了环肋数量及分布形式对壳体振动和噪声辐射的影响。结果表明肋骨数量变化对壳体结构振动声辐射特性的影响较大,而在相同环肋数量情况下,环肋分布形式对振动声辐射的影响相对要小。对电机舱段原型结构,研究了阻尼和激励力对舱段壳体振动声辐射的影响。与加肋壳体模型分析方法相同,应用有限元、流体边界元法分别计算了阻尼与力激励对原型壳体结构振动声辐射特性的影响。数值计算结果表明：在壳内增加阻尼层厚度以及减小壳内径向激励力的大小,可以有效地降低圆柱壳体的振动响应和向外声场的辐射噪声,对提高水下航行器的隐蔽性具有重要意义。 本文对圆柱壳体简单模型和电机舱段原型结构进行了声振特性的数值分析和试验研究工作,计算了空气中圆柱壳体结构的环肋、阻尼和激励力等因素对壳体振动特性和声辐射特性的影响并得出了相关结论。为深入研究水下航行器电机舱段壳体结构的振动和噪声辐射问题打下基础,对电机舱段壳体结构声学设计具有一定的参考价值。
[Abstract]:The cylindrical shell of the electric engine room is the basic structural form of underwater vehicle (torpedo, submarine, etc.). The study of its vibration and sound radiation characteristics is helpful to reveal the mechanism of noise radiation. It is of great significance to improve its concealment in water and to design low noise acoustics. Based on the vibration and noise radiation of underwater vehicle motor cabin cylindrical shell, the vibration and acoustic radiation characteristics of motor cabin shell structure in air are analyzed by using the method of experiment and numerical simulation. The effects of ring rib, damping force and excitation force on vibration and acoustic radiation of cylindrical shell are studied. The simple model of cylindrical shell is tested by single point force excitation in air. The model is simulated by finite element method and fluid boundary element method. The calculated noise radiation is in agreement with the measured results. It is shown that the numerical analysis method in this paper is correct. The finite element method and the fluid boundary element method are used to study the vibration and acoustic radiation of cylindrical shell structure, and the characteristics of vibration and acoustic radiation of the stiffened shell model are studied. The effects of the number and distribution of ring ribs on shell vibration and noise radiation are discussed. The results show that the variation of the number of ribs has a great influence on the acoustic radiation characteristics of the shell structure, but the distribution of the ring ribs has a relatively small effect on the vibration sound radiation under the same number of ring ribs. The effects of damping and excitation forces on the vibration and acoustic radiation of the cabin shell are studied for the prototype structure of the motor cabin. The effects of damping and force excitation on the acoustic radiation characteristics of the prototype shell structure are calculated by finite element method and fluid boundary element method respectively. The numerical results show that increasing the thickness of the damping layer and reducing the radial excitation force in the shell can effectively reduce the vibration response of the cylindrical shell and the radiated noise of the outward sound field. It is of great significance to improve the concealment of underwater vehicle. In this paper, the simple model of cylindrical shell and the prototype structure of motor cabin are numerically analyzed and experimentally studied, and the ring ribs of cylindrical shell structure in air are calculated. The effects of damping force and excitation force on the vibration and acoustic radiation characteristics of the shell are discussed. It lays a foundation for the deep study of vibration and noise radiation of underwater vehicle motor cabin shell structure, and has certain reference value for the acoustic design of motor cabin shell structure.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB532
本文编号：2156320
[Abstract]:The cylindrical shell of the electric engine room is the basic structural form of underwater vehicle (torpedo, submarine, etc.). The study of its vibration and sound radiation characteristics is helpful to reveal the mechanism of noise radiation. It is of great significance to improve its concealment in water and to design low noise acoustics. Based on the vibration and noise radiation of underwater vehicle motor cabin cylindrical shell, the vibration and acoustic radiation characteristics of motor cabin shell structure in air are analyzed by using the method of experiment and numerical simulation. The effects of ring rib, damping force and excitation force on vibration and acoustic radiation of cylindrical shell are studied. The simple model of cylindrical shell is tested by single point force excitation in air. The model is simulated by finite element method and fluid boundary element method. The calculated noise radiation is in agreement with the measured results. It is shown that the numerical analysis method in this paper is correct. The finite element method and the fluid boundary element method are used to study the vibration and acoustic radiation of cylindrical shell structure, and the characteristics of vibration and acoustic radiation of the stiffened shell model are studied. The effects of the number and distribution of ring ribs on shell vibration and noise radiation are discussed. The results show that the variation of the number of ribs has a great influence on the acoustic radiation characteristics of the shell structure, but the distribution of the ring ribs has a relatively small effect on the vibration sound radiation under the same number of ring ribs. The effects of damping and excitation forces on the vibration and acoustic radiation of the cabin shell are studied for the prototype structure of the motor cabin. The effects of damping and force excitation on the acoustic radiation characteristics of the prototype shell structure are calculated by finite element method and fluid boundary element method respectively. The numerical results show that increasing the thickness of the damping layer and reducing the radial excitation force in the shell can effectively reduce the vibration response of the cylindrical shell and the radiated noise of the outward sound field. It is of great significance to improve the concealment of underwater vehicle. In this paper, the simple model of cylindrical shell and the prototype structure of motor cabin are numerically analyzed and experimentally studied, and the ring ribs of cylindrical shell structure in air are calculated. The effects of damping force and excitation force on the vibration and acoustic radiation characteristics of the shell are discussed. It lays a foundation for the deep study of vibration and noise radiation of underwater vehicle motor cabin shell structure, and has certain reference value for the acoustic design of motor cabin shell structure.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB532
【参考文献】
相关期刊论文 前10条
1 陈美霞,骆东平,王祖华,郭华林,周锋;激励力对双层圆柱壳声辐射性能的影响[J];船舶力学;2005年02期
2 白振国;俞孟萨;;多层声学覆盖层复合的有限长弹性圆柱壳声辐射特性研究[J];船舶力学;2007年05期
3 王祖华;彭旭;谢官模;;部分敷设阻尼层的有限长环肋圆柱壳声辐射计算方法研究[J];船舶力学;2010年04期
4 陈军明,黄玉盈,曾革委;Vibration and Acoustic Radiation from Orthogonally Stiffened Infinite Circular Cylindrical Shells in Water[J];China Ocean Engineering;2002年04期
5 姚熊亮,杨娜娜,陶景桥;双层壳体水下振动和声辐射的仿真分析[J];哈尔滨工程大学学报;2004年02期
6 姚熊亮;张煦;刘文贺;;应力参数对圆柱壳声辐射影响的初探[J];哈尔滨工程大学学报;2007年11期
7 陈明;曹为午;陈美霞;金宝燕;;内部声源激励加筋双层圆柱壳声振计算方法[J];华中科技大学学报(自然科学版);2009年09期
8 陈美霞;和卫平;邱昌林;陈清坤;;力激励与声激励作用下圆柱壳声振性能试验[J];华中科技大学学报(自然科学版);2011年03期
9 姚耀中;林立;;潜艇机械噪声控制技术综述[J];舰船科学技术;2007年01期
10 左言言,宫镇;圆柱壳受激振动的分析研究[J];农业机械学报;1998年01期
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