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汽車車外噪聲聲源特性分析與識別
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    摘要:

    汽車車外噪聲信號是非平穩(wěn)信號，快速、準(zhǔn)確地對其聲源加以識別比較困難。提出了一種適用于非平穩(wěn)信號的聲源識別方法，利用二進(jìn)正交小波包將信號無冗余、無疏漏、正交地分解到獨(dú)立頻帶內(nèi)，對車外噪聲各聲源信號進(jìn)行特征提取，并應(yīng)用多維線性方程組求解方法得到各聲源對標(biāo)準(zhǔn)測點(diǎn)處噪聲的貢獻(xiàn)度。研究表明，該方法可揭示噪聲信號在時頻空間能量的細(xì)微變化，定量給出各聲源貢獻(xiàn)度。

    Abstract:

    Pass-by noise signal is non-stationary and time variant. It is difficult to identify sound sources accurately by the traditional FFT method. A new noise source identification technique was developed by using the wavelet packet transform. Firstly, the features of noise sources were extracted by the decomposition and reconstruction of the wavelet packet to time variant signals, and then, contributions were got from all kinds of the noise sources to the standard measuring point with the solving process of the multidimensional linear system of equations. Research showed that the technique could clearly distinguish noise energy change in the time-frequency domain and quantitatively identified noise sources. 

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賈繼德,李春亮,陳一永.汽車車外噪聲聲源特性分析與識別[J].農(nóng)業(yè)機(jī)械學(xué)報,2007,38(12):32-35.[J]. Transactions of the Chinese Society for Agricultural Machinery,2007,38(12):32-35.

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