基于互易原理和空间平均的水下传递函数测量

摘要

提出了不均匀混响声场中扩散声场互易传递函数的测量方法。通过交换激励位置和测量位置，互易测试可以回避正向测试中所遇到的激励空间狭小，受激结构脆弱等问题。基于空间平均方法，可以在混响声场中得到扩散声场传递函数。结合互易传递函数测量技术和虚拟力重构技术，可以仅依靠振动数据评估水下结构辐射噪声。通过数值仿真和湖上试验验证了上述理论。仿真和试验结果表明，提出的方法可以应用于复杂水下结构，有效消除不均匀混响声场的影响。相关工作可以为互易原理和空间平均方法的研究提供参考。%The measurement method of reciprocity transfer functions of diffuse sound fields in anomalous reverberant sound fields was proposed.Through reversing actuating points and measuring points in reciprocity measurement,the problems of direct-actuating measurements,such as narrow spaces and friable structures were avoided.Based on the spatial average method,the underwater radiated noise transfer functions of diffuse sound fields were obtained in reverberant sound fields.These transfer functions and the pseudo-force method were used to evaluate the radiated noise of underwater structures.This theory was validated with numerical simulations and a lake test.The results of simulations and tests showed that the proposed method can be applied in complex underwater structures to eliminate the influences of anomalous reverberant sound fields.The resalts provided a reference for further studying the reciprocity principle and the spatial average method.