Measures of vibrational localization on point-driven flat-panel loudspeakers
Measures of vibrational localization on point-driven flat-panel loudspeakers
复制标题
点驱动平板扬声器振动定位的测量
DOI：
10.1121/1.4949923
复制
发表时间：
2016
影响因子：
2.4
通讯作者：
M. Bocko
中科院分区：
文献类型：
--
作者：
David Anderson;Michael C. Heilemann;M. Bocko
关于平板或分布式扬声器的先前出版物通常假设局部驱动力能够在面板的表面上均匀地散布能量。然而，研究表明，面板振动保持本地化的驱动点在高频率，本文提出了更深入的调查这一现象。能量扩散将仅在面板在具有低模式密度的频率区域中被致动时发生，因为一起致动的许多模式将联合收割机组合以在驱动力的位置处形成带限δ函数。基于驱动点周围的小区域中所包含的能量与整个面板中所包含的能量的比率，引入了局部化的定量测量。实验表明，本地化上升均匀高于一个临界频率，这个临界频率与预测的高频板区域使用标准的模态重叠度量。
Previous publications on flat-panel, or distributed-mode, loudspeakers generally assume that a localized driving force is able to spread energy evenly across the surface of a panel. However, investigations have shown that panel vibrations remain localized around the driving point at high frequencies, and this paper presents a deeper investigation into this phenomenon. Energy spreading will only occur when the panel is actuated in a frequency region with a low density of modes, as many modes actuated together will combine to form a band-limited delta function at the location of the driving force. A quantitative measure of localization is introduced, based on the ratio of the energy contained in a small region around the driving point to the energy contained in the entire panel. Experiments demonstrate that the localization rises uniformly above a critical frequency, and this critical frequency correlates well with predictions of the high-frequency plate region using standard modal overlap metrics.