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声辐射问题
相关语句
  acoustic radiation problem
     Calculation on the acoustic radiation problem caused by vibrating body by boundary element method using cubic b spline interpolating function
     应用三次B样条函数插值的边界元法计算结构振动声辐射问题
短句来源
     In this paper, the boundary point method (BPM) is applied to calculating the exterior acoustic radiation problem caused by the vibrating body.
     本文利用边界点方法,对振动体外部声辐射问题进行了研究。
短句来源
     In this dissertation, the numerical computation for the acoustic radiation problem(ARP) is studied deeply and systematically in the theory, method and the application technique, based on analyzing the phylogeny and situation of the home and abroad on the numerical computation for the acoustic radiation problem.
     本文在分析了结构声辐射问题的发展历史和研究现状的基础上,从理论、方法和应用技术等方面对振动声辐射问题进行了深入系统的研究。
短句来源
     The formulation for the error analysis of acoustic radiation problem calculated by the boundary point method (BPM) is put forward; The physical explanation of the boundary point analysis of the acoustic radiation problem is given;
     第三章导出了边界点方法分析振动声辐射问题的误差估计理论公式,揭示了边界点方法分析振动声辐射问题的物理本质;
短句来源
     The combined boundary point method (CBPM) is applied to the calculation on the acoustic radiation problem caused by a vibrating simulation axial box of the lathe tool. From the comparison of the calculated results by CBPM, the measured ones and those of the distributed source boundary point method (DSBPM), it is revealed that the CBPM is an effective method for the calculation of acoustic radiation problem.
     将组合边界点法应用于声辐射问题的分析计算,通过对模拟车床主轴箱辐射声场的组合边界点法分析、试验测试结果以及与分布源边界点法分析结果的对比,证实了组合边界点法是一种准确、快速的结构振动声辐射问题计算方法。
短句来源
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  acoustic radiation problems
     A modal analysis for the acoustic radiation problems: Ⅱ. Examples
     声辐射问题中的模态分析,Ⅱ.实例
短句来源
     A modal analysis for the acoustic radiation problems:Ⅲ. Reconstruction of acoustic fields
     声辐射问题中的模态分析:Ⅲ.声场重构
短句来源
     A modal analysis for the acoustic radiation problems: Ⅰ. Theory
     声辐射问题中的模态分析:I理论
短句来源
     The boundary element formulation for half-space acoustic radiation problems is also discussed and validated.
     文中还讨论了用边界元法求解三维复杂结构在半空间内的声辐射问题,并进行了计算验证。
短句来源
     The acoustic radiation modes provide an analysis method for the acoustic radiation problems.
     利用声辐射模态方法研究了声辐射问题.
短句来源
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  sound radiation problems
     Application of Boundary Element Method to Sound Radiation Problems
     边界元方法在声辐射问题中的应用
短句来源
     This paper deals with the application of the boundary element method for sound radiation problems.
     讨论了边界元方法在声辐射问题中的应用.
短句来源
  “声辐射问题”译为未确定词的双语例句
     Introducing the theory and application of boundary element method on the sound radiation, giving the process of solving vibration noise radiation problem using boundary element analysis software;
     综合介绍了边界元法在声辐射问题上的理论及应用; 并给出了运用边界元法分析软件求解振动声辐射问题的过程。
短句来源
     Sound radiation by a simply supported unbaffled plate was presented.
     研究了处于无限大流体声介质中无障板简支板的声辐射问题 .
短句来源
     Applied Fourier transformation technology in this paper, the solution for the sound radiation of a plate with equidistant reinforced ribs has been obtained.
     本文应用富立叶变换技术,在波数域上求解具有相同加强筋平板在集中力作用下的声辐射问题,获得了辐射声压的解析表达式。
短句来源
     Based on the implementation and enhancement of the STSF-based NAH, sound field separation technique has been proposed in this dissertation. In order to overcome the shortcomings of the BEM and HELS based NAH, wave superposition approach (WSA) based NAH has been proposed and applied to the analysis of interior or exterior sound field.
     本文在实现和改进基于STSF方法的NAH技术基础上,提出了空间声场分离技术,为克服BEM和HELS方法的缺点,提出可应用于内、外声辐射问题分析的基于波叠加方法(WSA)的NAH技术。
短句来源
     Applying Fourier transformation technology in this paper, the solution for the sound radiation of a plate with equidistant reinforced ribs has been obtained.
     本文应用富立叶变换技术,在波数域上求解具有相同加强筋平板在集中力作用下的声辐射问题,获得了辐射声压的解析表达式。
短句来源
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  sound radiation problems
A modified indirect boundary element method for solving two-dimensional sound radiation problems
      
This paper proposes an engineering remedy to circumvent numerical shortcomings inherent in the indirect boundary element method (IBEM) to two-dimensional sound radiation problems.
      
The capability of the BEM to treat problems with infinite domains is of prior importance for the solution of sound radiation problems.
      


The application of BEM to the calculation of acoustic radiation from closed surfaces in an infinite acoustic medium has the advantages of less memory space, higher accuracy and faster calculating speed. However, the singular integrals and the nonuniqueness problem of surface Helmholtz equation at characteristic frequencies .should be dealt with. We suggest in this paper combination of the interior Helmholtz equation and its derivatives with respect to the coordinates of an interior point to form an extra equation,...

The application of BEM to the calculation of acoustic radiation from closed surfaces in an infinite acoustic medium has the advantages of less memory space, higher accuracy and faster calculating speed. However, the singular integrals and the nonuniqueness problem of surface Helmholtz equation at characteristic frequencies .should be dealt with. We suggest in this paper combination of the interior Helmholtz equation and its derivatives with respect to the coordinates of an interior point to form an extra equation, in order to solve the problems of acoustic radiation at various frequencies with surface Helmholtz equation; on the area which includes singular point, singular integrals are converted to ordinary ones by polar coordinate transformation. As an example, the acoustic radiation field of closed axisymmetric surfaces with prescribed surface velocity distribution is calculated in the paper.

采用边界元法求解封闭面在无限域声媒质中的辐射声场具有内存小、计算精度高、速度快等优点。但需处理被积函数在边界面上的奇异积分及表面Helmholtz方程在特征频率下无唯一解的问题。本文提出把内部Helmholtz方程与它关于内点坐标取导后的式子构成补充方程式,经与表面Helmholtz方程相结合,可求解任意频率下的声辐射问题;而在奇点附近区域,则提出用极坐标变换消除积分的奇异性。文中以轴对称形封闭面为例,计算了具有已知表面振速分布下的辐射声场。

Numerical calculation of fluid-structure acoustic coupling vibration were carried out for a 3-D elastic structure with FEM applied to structure analysis and BEM to fluid respectively. An emphasis is laid on the calculation of matrix elements in BEM. The combination problem at the fluid-structure boundary is solved and calculation is simplified. Numerical results of a practical example prove that the calculation method is satisfactory.

本文对水下三维弹性结构振动的声辐射问题进行了流体-结构声耦合振动的数值计算。对结构部分采用有限元法。流体部分采用边界元法。文中着重研究了边界元法中矩阵元素的数值计算,解决了流体与结构作用界面上的结合问题并简化了计算,编制了相应的较适用的计算机程序,对实例在微机上进行了计算,得到了满意的计算结果。

This model extents the numerical methods of solving the vibration and sound radiation From an elastic submerged spheroidal shell forced on the surface.The vibration of prolate spheroidal shell is described by the linear elastic thin shell theory of sander.The displacements (u_s u_θ w) and one bending moment (m_ζ) are chosen as four abasic vibration variables of the shell.The four-second order differential equations are deduced.The wave equation in prolate spheroidal coordiates is usedfor the sound field.By means...

This model extents the numerical methods of solving the vibration and sound radiation From an elastic submerged spheroidal shell forced on the surface.The vibration of prolate spheroidal shell is described by the linear elastic thin shell theory of sander.The displacements (u_s u_θ w) and one bending moment (m_ζ) are chosen as four abasic vibration variables of the shell.The four-second order differential equations are deduced.The wave equation in prolate spheroidal coordiates is usedfor the sound field.By means of the finite difference method, we have obtained the frequency response and distributions of radial displacement the pressure distributions on the surface of the shell and aloge the radial, and the pressure beam patterns radiated from the shell excited at one end.It is shows that the resonance is really present as the frequency of source is equal to one of the natural frequencies of the shell, and at some frequencies, the most strong vibration is not at the end excited.This model is not only suitable for one point source and multiple ones but also for symmetric and unsymmetric sources.

本文利用线性弹性薄壳理论描述椭球弹性壳体振动,引用Yen-Dimaggio的有限差分方法描述壳外声场.此模型推广了水下弹性椭球壳被点力源激励下的振动与声辐射问题的计算方法,它适用于单点与多点、对称与非对称受力情况,因而也适用于随机激励情况.数值计算了长椭球弹性壳体被端点力激励下的单频响应曲线及表面振动位移和声压的分布曲线,发现壳体声与振动的耦合谐振现象和简正模态关系,还计算分析了壳体辐射声场的近场传播规律以及远场指向性.

 
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