Development of Sound Source Identification System Using Inverse Transmission-Line Matrix Modeling

利用逆传输线矩阵建模开发声源识别系统

• 批准号: 11650250
• 负责人: TSUCHIYA Takao
• 金额: $ 1.41万
• 依托单位: Akita Prefectural University (2000-2001)Okayama University (1999)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650250/
• 关键词: TLM Method; Sound Source Identification; Inverse Propagation; Inverse Problem; Sound Wave Propagation; 数値シミュレーション

The inverse transmission-line matrix modeling is applied to a sound source identification system. Two identification methods are considered; one is the method using the amplitude distribution by FFT, and another is using the average power distribution. Two or three dimensional acoustic fields are considered for the numerical simulations. Some numerical demonstrations are made for several sound sources. The sources are well identified by both methods, but the FFT method is under the influence of the diffraction effect rather than the power method. It is found that the inverse transmission-line matrix modeling is capable for the sound source identification. The sources are not identified for the case that the separation of measurement points is lager than the wavelength of objective sound. Through the experiments under water, the measured wave forms at the several position in front of the ultrasonic transducer qualitatively agree with the calculated TLM solutions for the forward propagation process. The measured wave forms are then inputted into the computer program developed for the inverse propagation. It is confirmed that the sound waves propagate reversely to the sound source.

将逆传输线矩阵建模应用于声源识别系统。考虑了两种识别方法：一种是利用FFT的幅度分布的方法，另一种是利用平均功率分布。二维或三维声场被认为是数值模拟。对几种声源进行了数值模拟。这两种方法都能很好地识别源，但FFT方法受到衍射效应的影响，而不是功率方法。结果表明，逆传输线矩阵模型可以用于声源识别。当测点间距大于目标声波波长时，无法识别声源。通过水下实验，在超声换能器前几个位置处的实测波形与正向传播过程的TLM解定性一致。然后将测量的波形输入到为逆传播开发的计算机程序中。确认声波反向传播到声源。