The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance
The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance
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DOI：
10.3390/e18070253
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发表时间：
2016-07-01
期刊：
影响因子：
2.7
通讯作者：
Stoklosa, Jozef
中科院分区：
文献类型：
--
作者：
Figlus, Tomasz;Gnap, Jozef;Stoklosa, Jozef
本文提出了一种用于处理声学信号的方法，该方法允许从非常嘈杂的信号中提取包含关于内燃机的增加的气门间隙的诊断有用信息的分量。该方法使用通过离散小波变换执行的声学信号的两阶段去噪。然后，基于以这种方式清除的信号，计算其熵，作为过度清除引起的定性变化的定量测量。内燃机的实际声学信号的测试和处理使得能够清楚地提取包含关于被诊断的气门间隙的信息的分量。
The paper presents a method for processing acoustic signals which allows the extraction, from a very noisy signal, of components which contain diagnostically useful information on the increased valve clearance of a combustion engine. This method used two-stage denoising of the acoustic signal performed by means of a discrete wavelet transform. Afterwards, based on the signal cleaned-up in this manner, its entropy was calculated as a quantitative measure of qualitative changes caused by the excessive clearance. The testing and processing of the actual acoustic signal of a combustion engine enabled clear extraction of components which contain information on the valve clearance being diagnosed.