Goates Caleb B, Jones Cameron B, Sommerfeldt Scott D, Blotter Jonathan D
Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602, USA.
Department of Mechanical Engineering, Brigham Young University, Provo, Utah 84602, USA.
J Acoust Soc Am. 2020 Dec;148(6):3553. doi: 10.1121/10.0002870.
Research has shown that using acoustic radiation modes combined with surface velocity measurements provide an accurate method of measuring the radiated sound power from vibrating plates. This paper investigates the extension of this method to acoustically radiating cylindrical structures. The mathematical formulations of the radiation resistance matrix and the accompanying acoustic radiation modes of a baffled cylinder are developed. Computational sound power calculations using the vibration-based radiation mode (VBRM) method and the boundary element method are then compared and shown to have good agreement. Experimental surface velocity measurements of a cylinder are taken using a scanning laser Doppler vibrometer and the VBRM method is used to calculate sound power. The results are compared to sound power measurements taken using ISO 3741.
研究表明，结合表面速度测量使用声辐射模式可提供一种测量振动板辐射声功率的精确方法。本文研究了该方法在声学辐射圆柱结构中的扩展。推导了带障板圆柱的辐射阻抗矩阵及伴随声辐射模式的数学公式。然后比较了使用基于振动的辐射模式（VBRM）方法和边界元法进行的计算声功率计算结果，结果显示二者吻合良好。使用扫描激光多普勒测振仪对圆柱进行实验表面速度测量，并使用VBRM方法计算声功率。将结果与使用ISO 3741进行的声功率测量结果进行比较。
