开阔水域条件下界面反射对声源体积速度计算的影响估计

Estimation of the Influence of Interfacial Reflection on Volume Velocity Calculation of Sound Source in Open Water

摘要: 采用互易方法测量声源到测点传递函数的过程中需要测定声源体积速度，而体积速度的测量会受到环境混响的影响。针对典型的混响环境，文中通过数值仿真方法分别探究混响水池、湖中心环境、弧形码头环境、含远距离反射面的码头环境等全混响和部分混响条件下混响声和直达声的关系，并给出声源与测点相对位置变化对混响声影响声源体积速度的规律。数值结果表明：在10 Hz~1000 Hz的频率范围内，全反射界面条件下混响声对声源体积速度估计的影响不能忽略；在部分反射边界条件下，测点距离声源一定范围内误差小于2 dB，对声源体积速度的测定影响较小，而当测点距离声源超过x m时，误差超过X dB，此时，混响对声源体积速度估计的影响也不容忽视。

Abstract: It is necessary to measure the volume velocity of the sound source in the process of measuring the transfer function from the sound source to the measuring point by the reciprocity method, and the measurement of volume velocity is affected by environmental reverberation. In view of the typical reverberation environment, the relationship between reverberation sound and direct sound under full and partial reverberation conditions such as reverberation pool, lake center environment, curved dock environment, and dock environment with long-distance reflector surface is studied by numerical simulation method. The trend law of the influence of the relative position of the sound source and the hydrophone on the volume velocity of the sound source is given. The numerical results show that in the frequency range of 10 Hz~1000 Hz, the influence of reverberation on volume velocity estimation of the sound source can not be ignored under the condition of total reflection interface. Under partial reflection boundary conditions, the error within a certain range of the measuring point distance from the sound source is less than 2 dB, which has little influence on the measurement of the volume velocity of the sound source. When the error exceeds X dB, and the distance from the measuring point distance from the sound source exceeds x m, the influence of reverberation on the estimation of the volume velocity of the sound source cannot be ignored.