Institute of Acoustics, University Austral of Chile, Valdivia, Chile.
Int J Occup Saf Ergon. 2009;15(4):401-7. doi: 10.1080/10803548.2009.11076819.
Low-frequency sound radiation from vibrating plates is a practical problem often found in engineering applications. In this article, the sound radiation from a circular hatchway is examined using a discrete approach based in the acoustic resistance matrix. Since this matrix can be combined with the volume velocity vector on the discretized vibrating circular surface, the sound radiation efficiency can be estimated through matrix approaches. The limitation of the approach is discussed by using benchmark results presented in previous works. The method produces acceptable results in low frequencies when the response of the plate is dominated by one low structural mode. When the response of more than one mode is significant, the method gives good estimation of the total sound power just for frequencies up to the first resonance. However, the method can be applied to complex and irregular vibrating plane surfaces.
振动板的低频声辐射是工程应用中常见的实际问题。本文采用基于声学电阻矩阵的离散方法研究了圆形舱口的声辐射。由于该矩阵可以与离散化振动圆形表面上的体积速度矢量相结合，因此可以通过矩阵方法估计声辐射效率。通过使用以前工作中提出的基准结果讨论了该方法的局限性。当板的响应主要由一个低结构模态主导时，该方法在低频下产生可接受的结果。当多个模态的响应都很重要时，该方法可以很好地估计总声功率，频率最高可达第一共振频率。然而，该方法可以应用于复杂和不规则的振动平面。
