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首页> 外文期刊>ISRN Mechanical Engineering >Scan and Paint: Theory and Practice of a Sound Field Visualization Method
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Scan and Paint: Theory and Practice of a Sound Field Visualization Method

机译：扫描和绘画：声场可视化方法的理论与实践

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Sound visualization techniques have played a key role in the development of acoustics throughout history. The development of measurement apparatus and techniques for displaying sound and vibration phenomena has provided excellent tools for building understanding about specific problems. Traditional methods, such as step-by-step measurements or simultaneous multichannel systems, have a strong tradeoff between time requirements, flexibility, and cost. However, if the sound field can be assumed time stationary, scanning methods allow us to assess variations across space with a single transducer, as long as the position of the sensor is known. The proposed technique, Scan and Paint, is based on the acquisition of sound pressure and particle velocity by manually moving a P-U probe (pressure-particle velocity sensors) across a sound field whilst filming the event with a camera. The sensor position is extracted by applying automatic color tracking to each frame of the recorded video. It is then possible to visualize sound variations across the space in terms of sound pressure, particle velocity, or acoustic intensity. In this paper, not only the theoretical foundations of the method, but also its practical applications are explored such as scanning transfer path analysis, source radiation characterization, operational deflection shapes, virtual phased arrays, material characterization, and acoustic intensity vector field mapping.
机译：声音可视化技术在整个历史上的声学发展中一直发挥着关键作用。用于显示声音和振动现象的测量设备和技术的发展为建立对特定问题的理解提供了出色的工具。逐步测量或同步多通道系统等传统方法在时间要求，灵活性和成本之间有很强的权衡。但是，如果可以将声场假定为时间固定的，则只要知道传感器的位置，扫描方法就可以让我们使用单个换能器评估整个空间的变化。所提出的技术“扫描和绘制”基于通过在声场上手动移动P-U探头（压力-粒子速度传感器），同时使用摄像机拍摄事件来获取声压和粒子速度的技术。通过对记录的视频的每个帧应用自动颜色跟踪来提取传感器位置。然后可以根据声压，粒子速度或声强可视化整个空间中的声音变化。在本文中，不仅探讨了该方法的理论基础，而且探索了其实际应用，例如扫描传输路径分析，源辐射表征，操作偏转形状，虚拟相控阵，材料表征以及声强矢量场映射。

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