不同类型激励对柱壳声振特性的影响
发布时间：2019-04-11 17:35
【摘要】：水下航行器在许多国家得到越来越普遍的运用。它不仅能够完成对敌人军舰或潜艇的侦查和攻击，而且还能用于海洋科学的研究、勘探和科学侦测。然而随着现代科学技术的高度发展，水下航行器的开发和优化得到了各个国家越来越高的重视。特别是在军事方面，水下航行器的隐蔽性是其发挥自身作战功能的最重要条件。因此如何降低水下航行器的振动和噪声一直是国内外学者关注和研究的热点问题。而作为水下航行器的主要噪声来源的结构噪声，也就成为了大多数学者研究的重点问题。结构噪声是水下航行器的动力装置运行时所产生不平衡力或者力矩所引起的，所以对于外激励对水下航行器声振特性影响的研究有着十分重要的意义。 本文针对不同类型的激励对所建立模型的声振特性的影响规律做了研究。首先建立一个锥-柱结合的壳体模型，运用极限假设和传递矩阵的方法得到整个模型的振动方程。利用MATLAB软件计算得到模型的模态频率，将所得数值计算结果与有限元仿真计算结果做了比较，验证了所用方法的正确性。随后将激励力或力矩进行模态分解后施加在模型上，尝试推导了模型在有激励情况下的振动方程和辐射声功率。最后在有限元软件ANSYS中分别建立轴对称圆柱壳体的有限元模型和非轴对称椭圆柱壳体的有限元模型，在SYSNOISE中计算分析了不同类型的激励对模型声振特性的影响规律、模型的部分结构参数和激励的位置对模型声振特性的影响规律。研究结果发现：轴向力矩激励对模型声振特性的影响起主要作用；模型的壳体厚度增加可以有效的降低外激励对模型声振特性的影响；轴对称模型柱壳段内环肋数目的增加和非轴对称模型柱壳截面椭圆度的变化对模型声振特性的影响都较为复杂；激励点在中间位置时的声辐射功率比激励点靠近模型两侧位置时的声辐射功率要高。 本文旨在揭示不同类型的激励对壳体模型声振特性的影响规律，为水下航行器的结构设计和动力装置的布置提供一定参考，，进而可以为其减振降噪提供依据和指导。
[Abstract]:Underwater vehicles are more and more widely used in many countries. It can not only detect and attack enemy warships or submarines, but also be used in marine science research, exploration and scientific detection. However, with the development of modern science and technology, the development and optimization of underwater vehicle has been paid more and more attention by many countries. Especially in military aspect, the concealment of underwater vehicle is the most important condition for it to play its own combat function. Therefore, how to reduce the vibration and noise of underwater vehicle has been the focus of attention and research at home and abroad. As the main source of underwater vehicle noise, structural noise has become the focus of most scholars. The structural noise is caused by the unbalanced force or torque produced by the power plant of the underwater vehicle, so it is of great significance to study the influence of external excitation on the acoustic and vibration characteristics of the underwater vehicle. In this paper, the influence of different types of excitation on the acoustic and vibration characteristics of the model is studied. Firstly, a cone-column combined shell model is established, and the vibration equation of the whole model is obtained by means of limit hypothesis and transfer matrix. The modal frequencies of the model are calculated by using MATLAB software. The numerical results are compared with the results of finite element simulation, and the correctness of the method is verified. Then the excitation force or moment is decomposed and applied to the model, and the vibration equation and radiation sound power of the model are derived. Finally, the finite element models of axisymmetric cylindrical shell and non-axisymmetric ellipsoidal cylindrical shell are established in the finite element software ANSYS. The effects of different types of excitation on the acoustic vibration characteristics of the model are calculated and analyzed in SYSNOISE. The influence of some structural parameters and excitation position of the model on the acoustic and vibration characteristics of the model. The results show that the axial torque excitation plays a major role in the acoustic vibration characteristics of the model, and the shell thickness of the model can effectively reduce the influence of external excitation on the acoustic vibration characteristics of the model. The increase of the number of ring ribs in the cylindrical shell section of the axisymmetric model and the influence of the ellipticity of the cylindrical shell section of the non-axisymmetric model on the acoustic vibration characteristics of the model are complicated. When the excitation point is in the middle position, the acoustic radiation power is higher than that when the excitation point is close to the two sides of the model. The purpose of this paper is to reveal the influence of different types of excitation on the acoustic and vibration characteristics of the shell model, to provide some references for the structural design of the underwater vehicle and the arrangement of the power plant, and to provide the basis and guidance for the vibration and noise reduction of the underwater vehicle.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.941;U661.44
本文编号：2456621
[Abstract]:Underwater vehicles are more and more widely used in many countries. It can not only detect and attack enemy warships or submarines, but also be used in marine science research, exploration and scientific detection. However, with the development of modern science and technology, the development and optimization of underwater vehicle has been paid more and more attention by many countries. Especially in military aspect, the concealment of underwater vehicle is the most important condition for it to play its own combat function. Therefore, how to reduce the vibration and noise of underwater vehicle has been the focus of attention and research at home and abroad. As the main source of underwater vehicle noise, structural noise has become the focus of most scholars. The structural noise is caused by the unbalanced force or torque produced by the power plant of the underwater vehicle, so it is of great significance to study the influence of external excitation on the acoustic and vibration characteristics of the underwater vehicle. In this paper, the influence of different types of excitation on the acoustic and vibration characteristics of the model is studied. Firstly, a cone-column combined shell model is established, and the vibration equation of the whole model is obtained by means of limit hypothesis and transfer matrix. The modal frequencies of the model are calculated by using MATLAB software. The numerical results are compared with the results of finite element simulation, and the correctness of the method is verified. Then the excitation force or moment is decomposed and applied to the model, and the vibration equation and radiation sound power of the model are derived. Finally, the finite element models of axisymmetric cylindrical shell and non-axisymmetric ellipsoidal cylindrical shell are established in the finite element software ANSYS. The effects of different types of excitation on the acoustic vibration characteristics of the model are calculated and analyzed in SYSNOISE. The influence of some structural parameters and excitation position of the model on the acoustic and vibration characteristics of the model. The results show that the axial torque excitation plays a major role in the acoustic vibration characteristics of the model, and the shell thickness of the model can effectively reduce the influence of external excitation on the acoustic vibration characteristics of the model. The increase of the number of ring ribs in the cylindrical shell section of the axisymmetric model and the influence of the ellipticity of the cylindrical shell section of the non-axisymmetric model on the acoustic vibration characteristics of the model are complicated. When the excitation point is in the middle position, the acoustic radiation power is higher than that when the excitation point is close to the two sides of the model. The purpose of this paper is to reveal the influence of different types of excitation on the acoustic and vibration characteristics of the shell model, to provide some references for the structural design of the underwater vehicle and the arrangement of the power plant, and to provide the basis and guidance for the vibration and noise reduction of the underwater vehicle.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U674.941;U661.44
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