基于Widrow-Hoff LMS算法的柴油机排气噪声主动控制

Investigation of Diesel Exhausting Noise Active Control Based on Widrow-Hoff Arithmetic

柴油机排气噪声是谐波性强的低频间歇性噪声。为此,提出了利用波形合成技术对其间歇性低频排气噪声进行自适应主动控制的观点,并利用Widrow-Hoff LMS算法计算最佳的误差权值。在这一算法的基础上,建立了模拟试验台,并进行了模拟实验研究。实验结果表明:该方法可有效地控制排气噪声,且当转速变化时,由于待合成的谐波基频同样变化,同频谐波消声器可以准确跟踪。

Exhaust noise of diesel engines is a kind of low frequency intermittent noise with strong humorous waves. A exhaust noise control method employing waveform composition technology is introduced, the Widrow-Hoff LMS arithmetic is used in the method to compute the weight. Experimental investigations are also launched. The results indicate that the method can effectually control exhausting noise, and can trace the variation of rotating speed because of the change of the base frequency of humorous waves.