非消声水池声强法声功率测试的数值模拟

针对非消声水池中采用声强法获取低频辐射声功率研究较少的情况,提出对声强法声功率测试过程进行数值模拟,以获得必要的测试参数。建立水中大尺度圆柱壳结构的有限元模型以及水池的边界元模型,将圆柱壳的响应作为边界元模型的速度边界条件,计算水池中测试阵面的声强。通过叠加获得圆柱壳的辐射声功率,然后依次调整测试参数(面元大小、阵面高度、自由面和底部包络面、池壁吸声),并将各种计算结果与自由场中圆柱壳的辐射声功率进行比较,最终获得适合工程应用的测试参数设置。

Numerical Investigation of Radiated Sound Power by Sound Intensity Technology in Non-Anechoic Tank

To investigate the low frequency radiated sound power by sound intensity technology in non-anechoic tank,numerical investigation of test process was proposed to obtain some test parameters.The finite element model of large scale cylinder and boundary element of tank were built;the distribution of vibration velocity of cylinder was used as the boundary condition for tank model to calculate the sound intensity of measurement plane in tank.Through the process of obtaining the total sound power by summing up the product of sound intensity and area of each sub-surface,changing the test parameters(size of sub-surface,height of measurement plane,envelope plane of free surface and bottom,absorption of wall),comparing the results with total radiated sound power of cylinder in infinite domain,the suitable test parameters for engineering application were obtained.