一种检测多频多源复杂稳定声场声压的新方法

发布时间：2018-03-27 16:45

  本文选题：多频多源　切入点：稳定声场　出处：《机械设计与制造》2017年04期

【摘要】：针对准确检测出多频多源声场复声压信号不理想,并且在信噪比(SNR)较低的情况下,现有的检测方法很难解决,提出了一种结合自适应算法、信号互谱和信号能量不变原则检测多频多源复杂稳定声场声压的方法。该方法首先利用自适应算法求出背景随机噪声,再次利用自适应算法求出声源辐射信号,并对频谱分析和校正,结合信号互谱、信号正交,以及信号能量不变原则得出声场中检测点的复声压,最后通过算例验证此方法的有效性和可行性,即使声场在多频多源且信噪比较低的情况下,仍然能精确测出声场测点的复声压信号。
[Abstract]:In order to detect the complex sound pressure signal of multi-frequency and multi-source sound field accurately and under the condition of low SNR, the existing detection methods are difficult to solve, so a combined adaptive algorithm is proposed. The principle of signal cross-spectrum and signal energy invariance is used to detect the sound pressure of multi-frequency and multi-source complex and stable sound field. In this method, the background random noise is obtained by adaptive algorithm, then the sound source radiation signal is obtained by adaptive algorithm. For spectrum analysis and correction, combined with the principle of signal cross-spectrum, signal orthogonality and signal energy invariance, the complex sound pressure of the detection point in the sound field is obtained. Finally, the validity and feasibility of this method are verified by an example. Even if the sound field is multi-frequency and multi-source and the signal-to-noise ratio is low, the complex sound pressure signal of the sound field can be accurately measured.
【作者单位】： 广西科技大学汽车与交通学院;
【基金】：广西高校自然科学基金项目-基于ACLD+ANC技术的封闭弹性腔体噪声复合控制研究(2013YB172) 广西自然科学基金面上项目(2013GXNSFAA019318)
【分类号】：TB522
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本文编号：1672360