本文選題：多頻多源　切入點(diǎn)：穩(wěn)定聲場　出處：《機(jī)械設(shè)計與制造》2017年04期

【摘要】：針對準(zhǔn)確檢測出多頻多源聲場復(fù)聲壓信號不理想,并且在信噪比(SNR)較低的情況下,現(xiàn)有的檢測方法很難解決,提出了一種結(jié)合自適應(yīng)算法、信號互譜和信號能量不變原則檢測多頻多源復(fù)雜穩(wěn)定聲場聲壓的方法。該方法首先利用自適應(yīng)算法求出背景隨機(jī)噪聲,再次利用自適應(yīng)算法求出聲源輻射信號,并對頻譜分析和校正,結(jié)合信號互譜、信號正交,以及信號能量不變原則得出聲場中檢測點(diǎn)的復(fù)聲壓,最后通過算例驗證此方法的有效性和可行性,即使聲場在多頻多源且信噪比較低的情況下,仍然能精確測出聲場測點(diǎn)的復(fù)聲壓信號。
[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.
【作者單位】： 廣西科技大學(xué)汽車與交通學(xué)院;
【基金】：廣西高校自然科學(xué)基金項目-基于ACLD+ANC技術(shù)的封閉彈性腔體噪聲復(fù)合控制研究(2013YB172) 廣西自然科學(xué)基金面上項目(2013GXNSFAA019318)
【分類號】：TB522
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本文編號：1672360