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首页> 外文会议>SAE Noise and Vibration Conference and Exhibition >The Very Near Field II An introduction to Very Near Field Holography
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The Very Near Field II An introduction to Very Near Field Holography

机译：近田间II非常近的现场全息术

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It is shown that very close (distance smaller than L/2π) to a vibrating and flat structure with typical size L, the normal particle velocity and the (normal) structural velocity coincide. It is shown that with an acoustic particle velocity sensor the normal acoustic particle velocity close to the surface can be measured and that this velocity coincides with the surface velocity that is measured with a laser vibrometer or accelerometer. It is also shown that in the very near field (contrary to the behavior in the near field) the particle velocity level doesn't depend upon frequency. Furthermore, in the very near field, there is a linear relationship between the particle velocity as measured and the structural velocity to be measured. In this paper it is shown that the normal acoustic particle velocity appears to be a good representation of the structural velocity up to distances of L/2 (with L the size of the vibrating structure) and lateral movements of the structure are not measured by the lateral particle velocity. It is also shown that the lateral acoustic particle velocity is zero if the normal velocity is maximal. A simple holography method is presented based on the very near field concept.
机译：结果表明，具有典型尺寸L的振动和扁平结构（具有典型的尺寸L，正常颗粒速度和（常规）结构速度重合的振动和扁平结构非常接近（距离。结果表明，通过声学粒子速度传感器，可以测量靠近表面的正常声学颗粒速度，并且该速度与用激光振动器或加速度计测量的表面速度。还示出，在非常接近的场上（与近场的行为相反），粒子速度水平不依赖于频率。此外，在非常接近的场上，在测量的颗粒速度和待测量的结构速度之间存在线性关系。在本文中，示出了正常声学颗粒速度似乎是L / 2距离的结构速度的良好表示（具有振动结构的尺寸），并且结构的横向移动不是由侧颗粒速度。还表明，如果正常速度最大，则横向声粒子速度为零。基于非常近的现场概念呈现简单的全息方法。

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