基于短脉冲信号设计的导流罩模型宽带透声性能测试方法

摘要

通过分析传统水声材料透声性能测试方法基本原理，明确声波绕射和模型边缘声衍射引起的测试数据时域混叠，是导致获取的透声系数存在异常值的主要原因。为了消除测试数据时域混叠，本文利用宽频短脉冲设计技术和时域数据截取技术，形成了一种应用声波传递路径中有无模型时，水听器接收到的宽频信号衰减量得到模型透声系数方法，有效解决了导流罩透声性能低频测试数据有效性问题，为导流罩透声设计效果评估提供实验手段。%According to analyses the classical method theory. Acoustic diffraction is the main reason of test data time-domain aliasing. In order to removal the aliasing problem, realize low frequency -band transmission coefficients tests of local-sonar-dome model. In this paper, a new method is proposed to solve the aliasing problem of classical method. Short pulse designing and data intercepting technologies are used in this method. It can be used to test low frequency-band transmission coefficients of local-sonar-dome model conveniently and efficiently.