These zip-top bags are great space-savers if storage is limited. 如果可储藏的地方有限,这些拉环式背包能节省很大空间。
The exterior noise of a truck was analyzed and predicted with the nearfield acoustic holography and the space transformation of sound field. 以某载货汽车为研究对象,利用近场声全息和声场空间变换方法对其车外噪声进行了分析预测。
This paper introduces the common methods in identifying vehicle noise, and gives a introduction of the method of acoustic holography which has been extensively applied now. 作者介绍了识别汽车噪声源的常用方法,并对其中得到广泛应用的声全息法进行了较详细的论述。
The acoustic holography technique for sound source identification and position by the method of continuously scanning improves the previous acoustic holography experiment. 连续扫描声全息声源识别定位技术是对以往声全息实验方法的改进。
Research on acoustic holography method for the identification of sound source 用于声源识别的声全息重建方法的研究
Investigation on Acoustic Holography Technique for Underwater Sound Source Identification and Position by Continuously Scanning Sound Field 水下声场连续扫描声全息声源识别定位技术研究
A new method based on interpolation using orthogonal spherical wave source was proposed to enhance the resolution of the nearfield acoustic holography image without adding measurement points. 为了在不增加测量点数的情况下提高近场声全息图像的空间分辨率,提出一种基于正交球面波插值的近场声全息图像分辨率增强方法。
A study of measurement point reduction in near-field acoustic holography 近场声全息(NAH)中减少测量点数的研究
Approach Based on Non-Prior Base Analysis for Improving Precision of Acoustic Holography Construction 基于非先验基分析提高声场重建精度
Numerical simulation shows that the method can enhance the resolution of the nearfield acoustic holography image efficiently. 数值仿真表明该方法可以有效提高近场声全息图像的分辨率。
A method based on wave superposition approach is proposed for enhancing the spatial resolution of the nearfield acoustic holography. 提出一种基于波叠加法的近场声全息空间分辨率增强方法。
Application of Time Slice to Imaging System Using Acoustic Holography 全息摄影的图像系统中时间片的应用
Spacial frequency domain reconstruction method for acoustic holography analysis of noise fields 声全息分析噪声场的空间频域重建算法
Acoustic holography is an effective method to analysis noise fields. 声全息方法是分析噪声场的一种有效手段。
Study on Noise Sources Identification Using Cylinder Acoustic Holography Method and Its Numerical Implementation 声源识别的柱面声全息方法与数值实现研究
Sound field separation technique and its applications in near-field acoustic holography 声场分离技术及其在近场声全息中的应用
Since noise measurement and control engineering are attracting more and more attentions, near-field acoustic holography ( NAH) and acoustic sensitivity analysis have been investigated in this dissertation. 本文围绕产品噪声测量与控制这一日益受到关注的课题,开展了关于近场声全息技术(NAH)和声学灵敏度分析方面的研究。
Experimental Research on Noise Source Identification Using Near-Field Acoustic Holography Method 近场声全息方法识别噪声源的实验研究
Near field acoustic holography based on intensity measurement and application in radiating analysis of underwater sound sources 基于声强测量的近场声全息及其在水下声源声辐射分析中的应用
Acoustic holography has attained a high lateral resolution but a poor axial resolution. 感音全息摄影技术已经取得了较高的横向分辨率,但轴向分辨率并不理想。
Study on amplitude modification of sound sources in the applicationof acoustic holography to identify noise source 利用声全息方法识别噪声源问题中声源幅值修正的研究
The acoustic field separation technique of the statistically optimal cylindrical nearfield acoustic holography has also been developed. 针对柱面内外声辐射问题,分别推导了统计最优柱面内、外近场声全息技术的理论公式。
One Near field Acoustic Holography ( NAH) technique is proposed for analyzing cyclostationary sound field. 提出一种用于分析循环平稳声场的近场声全息技术。
The near field acoustic holography technique for cyclostationary sound field and its experimental research 循环平稳声场近场声全息理论与实验研究
Taking into account the difficulties of direct measurement on sound pressure of thermoacoustic source, the near-field acoustic holography based on equivalent source method is introduced. An inversion model of thermoacoustic pressure field is established. 接着,分析了直接测量点焊热声源声压幅值的困难,并引进了基于等效源法的近场声全息技术,建立了电阻点焊熔核热声声压场反演模型。
Near-field acoustic holography is an important technology of Acoustic Holography, a significant way to distinguish noise. 声全息方法是一种重要的声成像技术,是识别噪声源的一种有效方法。
Near-field acoustic holography is a very effective technique for noise source identification, location and sound field visualization. 近场声全息技术是一种非常有效的噪声源识别、定位和声场可视化技术。
Statistically optimal Near-field acoustic holography can inhibit the interference of sound source outside measuring surface coverage for reconstruction result. 统计最优近场声全息技术可以抑制测量面覆盖范围外声源对重构结果的干扰,在大声源面全息重构时具有较大的优势。
Near-field acoustic holography is a very important technology in acoustic researching, which can reconstruct and predict acoustic quantities in the whole 3-D field by recording the sound pressure in the near-field of radiator. 近场声全息是声学研究中的一种极其重要的方法,通过在辐射体的近场测量声压数据可以重建和预测出整个三维空间声场的声学量。
After a great deal of numerical simulation and experiment, the effectiveness of this combination method and its superiority to Acoustic holography and beam-forming method were verified. 经过大量的数值仿真和实验,验证了组合方法的有效性和它相对于波束形成方法与声全息方法的优越性。