元声

四元声传感器面阵快速测向算法及误差分析

Fast Direction Finding Algorithm for Four-Acoustic Sensor Square Planar Array and Its Error Analysis

指出了最佳平面三阵元声被动定位阵列的几何特征。

The feature of optimum of passive acoustic location in plane is put forward .

任意四元声强向量阵被动定向方法和实验研究

Passive Directional Method Based on Arbitrary Four-sensor Vector Sound Intensity Array and Its Experimental Investigations

阮玲玉的演技堪称中国元声影片的最高水平。

Her acting skills represented the highest level of the performing art in Chinese silent films .

因而，边界元声全息所需的双平面声全息数据可由两条静止的线阵获得。

Thus , a dual-plane holographic data required in BEM-based NAH can be obtained by two stationary linear arrays .

首先对适用于任意形状的结构声源重建的边界元声全息做了理论验证。

It is very valuable in engineering . First , the theoretical verification of BEM-based NAH has been done , which applied to the reconstruction of the arbitrary shaped moving structure .

四元被动声敏感阵列定位模型分析和仿真

Modeling of passive acoustic sensing with four-sensor array for target localization

柴油机喷油器振动的有限元及声辐射分析研究

Research on Finite Element and Acoustic Radiation Analysis of Ice 's Injector Vibration

任意形状三阵元平面声被动目标定位分析

The Analyze of Passive Acoustic Location in Plane by Random Shape Array of Three Sensor

在此基础上，仿真讨论了边界元法声全息应用中各参数对全息结果的影响。

On this basis , the influence of various parameters to holographic results was discussed .

三轴四元非典型声强向量阵对低频声源全空间定向的理论与实验研究

Theoretical and Experimental Exploration on Two-Dimensional DOA Estimation for Low Frequency Sound Source with Non-typical Vector Acoustic Intensity Array

对其进行误差分析后，并与五元空间声阵被动声定位性能进行比较，得出七元空间声传感器阵列被动声定位算法能有效的提高了目标声源位置定位性能的结论。

Compared with five-element array passive acoustic positioning performance , arrive at the conclusion that seven-element array passive acoustic positioning could improve the positioning performance .

针对此问题，从增加声传感器角度出发，提出七元空间声传感器阵列被动声定位算法。

According to this problem , from the increase the number of sound sensor , propose seven-element array passive acoustic positioning and error analysis of this algorithm .

文中在分析了小波变换理论基础后，将一阶离散高斯小波时间延迟估计算法引入至五元空间声阵被动声定位中，发现其估计算法估计性能较差，且算法又较为复杂。

In this paper , after analysis of wavelet transformation theory foundation , using the discrete wavelet transform multiscale products in five-element array passive acoustic positioning , found that this algorithm has poor precision in the time delay estimation and also is more complicated .

利用峰峰值P矩阵和有效值P矩阵模拟了纵向耦合谐振结构以及阻抗元结构的声表面波滤波器的频响。

The peak to peak values P matrix and the effective values P matrix are used to simulate the frequency responses of the LCRF structure and IEF structure SAW filters .

三元周期结构声禁带形成机理

Mechanism of broad acoustic band - gap in the three-component composite

自由阻尼处理结构的有限元建模及声辐射分析

Finite Element Modelling and Acoustic Radiation Analysis of Structures with Free Damping Treatment

全特解场边界元方法在声辐射逆问题中的应用研究

Application and research of all particular solution boundary element method in inverse acoustic radiation problem

用边界元法计算声辐射时高次奇异积分的处理方法

A method of treating high order singular integration in calculation of sound radiation with BEM

讨论了边界元方法在声辐射问题中的应用。

This paper deals with the application of the boundary element method for sound radiation problems .

边界子波谱方法中的一种奇异积分方法用子波谱与有限元耦合求解声振耦合的声响应简单有向图谱半径的界

Application of Coupled Finite Element and Wavelet Boundary Spectral Method to the Solution of Structural-acoustic Coupling of Axisymmetric Bodies

用子波谱与有限元耦合求解声振耦合的声响应轴对称管道及消声器内部声场与管口声辐射问题的边界元法计算

The Calculation of Acoustic Field in Axisymmetric Ducts and Mufflers as well as Sound Radiation From Open End Using Boundary Element Method

与基于边界元法的声全息相比较，基于波叠加法的声全息在原理上更易于理解，在计算机上更容易实现。

The principle of WSA based acoustic holography is easier to understand , and it is more amiable to implement on the computer .

因而，基于波叠加法的声全息就不存在边界面上的参数插值和奇异积分等问题，而这些问题是基于边界元法的声全息所固有的。

Therefore , there are no problems such as parameters interpolation , singular integration etc. in WSA based acoustic holography , which are inherent to BEM based NAH .

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。

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 ;

提出一种用边界元方法与声辐射理论求解复杂结构的声辐射模态与声辐射效率的理论方法。

A theoretical method to solve acoustical radiation modes and acoustical radiation efficiency of complex structure by a boundary element method and acoustical radiation theory is posed in this paper .

声辐射系数是轮轨噪声预测的重要参数，用边界元方法预测声辐射系数，并以钢轨为例，计算了垂向和横向声辐射系数。

Acoustic radiation characteristics of rails are the keys for predicting wheel-rail noises . This paper presents a boundary element method ( BEM ) that can be used to predict rail radiation coefficients .

该方法避开了基于边界元法的声全息重建和预测模型中的变量插值、数值积分和奇异积分的处理，具有计算速度快、计算精度高、计算稳定性好等优点。

Compared with NAH based on the boundary element method ( BEM ), variable interpolation , numerical calculation and disposal of singular integral are avoided in this method . It has advantages of fast calculation , high precision , good stability , simplicity and clarity in computation .

为验证振动响应结果的合理性，进行了发电机振动测试实验。最后将电磁振动相应结果导入LMSVirtual.Lab中，应用瞬态边界元法进行电磁声辐射计算，得到各振动响应的声辐射结果。

The generator vibration tests were done and that prove the rationality of electromagnetic vibration response . Lastly , electromagnetic vibration response results were imported to LMS Virtual . Lab and transient boundary element method is used to calculate electromagnetic acoustic radiation and the sound radiation results were achieved .

埋入混凝土中压电元的电-声换能特性研究

Study on Electroacoustic Transduction Performances of Piezoelectric Transducers Embedded in Concrete