Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
J Acoust Soc Am. 2012 Mar;131(3):2495-9. doi: 10.1121/1.3677250.
This paper describes a semi-quantitative method, suitable for a student laboratory exercise that shows that the acoustic properties of the soundbox of a musical instrument depend on the sound speed of the atmosphere surrounding and filling the instrument. A gas tent was constructed and used to enclose instruments in helium, carbon dioxide and mixtures thereof, allowing the sound speed to be varied from 250 to 1000 m/s. Soundboard admittance data were taken using a guitar and a violin as examples. The data, expressed as contour plots, show clearly the qualitative relationship between air and wood modes, and the guitar data are compared with a simple mechanical model. Experimental details of the construction and operation of gas tent are given, with attention paid to safety issues.
本文介绍了一种半定量方法，适合学生实验室练习，该方法表明乐器音箱的声学特性取决于周围和充满乐器的大气的声速。构建了一个气体帐篷，用于将乐器封闭在氦气、二氧化碳及其混合物中，从而可以将声速从 250 米/秒变化到 1000 米/秒。使用吉他和小提琴作为示例，获取了音板导纳数据。以等高线图的形式表示的数据清楚地显示了空气和木材模式之间的定性关系，并且对吉他数据与简单的机械模型进行了比较。文中给出了气体帐篷的构造和操作的实验细节，并注意到了安全问题。
