The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance
Abstract
:1. Introduction
2. Signal Processing Method
- decomposition of the signal;
- assumption of the threshold coefficient and of the number of decomposition levels;
- cutting off the noise at each decomposition level;
- signal reconstruction.
3. Test Stand
- Engine I—capacity of 1.2 L, a mileage of 130,000 kilometres, eight-valve heads.
- Engine II—capacity of 1.6 L, a mileage of 160,000 kilometres, eight-valve heads, and an older generation engine.
- norsonic signal analysers along with a condenser microphone (Norsonic AS, Tranby, Norway) used to measure the acoustic pressure over the engine valve cover with distance 0.5 m (Figure 3);
- an optic sensor used to record the reference signal of the crankshaft positioning;
- a DSPT SigLab signal analyser (DSP Technologies Inc., Santa Barbara, CA, USA);
- a computer used for signal recording.
4. Results and Discussion
- the length of the analysed signal corresponded to a 720° crankshaft rotation of the tested combustion engines, recorded at the rotational speed of idling;
- Daubechies 2 wavelet;
- number of decomposition levels = 6;
- threshold value of the 1st level of denoising = 0.5 (engine I) or 1.1 (engine II);
- threshold value of the 2nd level of denoising = 0.17 (engine I) or 0.6 (engine II);
- soft thresholding;
- window length during calculation of entropy = 20 samples.
- the length of the analysed signal should correspond to a complete working cycle of a four-stroke engine, i.e., 720° of crankshaft rotation;
- the selected wavelet should approximate well the analysed signals;
- the decomposition levels and the threshold type and values should allow for maximum (in terms of quality) clearing of the signal of interference, without causing any substantial reduction in the contents in the information included in the signal; on the other hand, the dynamics of sensitivity of quantitative and qualitative changes in entropy to the detected valve clearance should be high.
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Engine I | αin | 7° | αex | 41° |
βin | 43° | βex | 5° | |
Engine II | αin | 6° | αex | 48° |
βin | 44° | βex | 2° |
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Figlus, T.; Gnap, J.; Skrúcaný, T.; Šarkan, B.; Stoklosa, J. The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance. Entropy 2016, 18, 253. https://doi.org/10.3390/e18070253
Figlus T, Gnap J, Skrúcaný T, Šarkan B, Stoklosa J. The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance. Entropy. 2016; 18(7):253. https://doi.org/10.3390/e18070253
Chicago/Turabian StyleFiglus, Tomasz, Jozef Gnap, Tomáš Skrúcaný, Branislav Šarkan, and Jozef Stoklosa. 2016. "The Use of Denoising and Analysis of the Acoustic Signal Entropy in Diagnosing Engine Valve Clearance" Entropy 18, no. 7: 253. https://doi.org/10.3390/e18070253