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| Description
| - This paper presents a statistical technique to enhance vibration signals measured by Laser Doppler Vibrometry (LDV). The method has been optimised for LDV signals measured on bearings of universal electric motors and applied to quality control of washing machines. Inherent problems of LDV are addressed, particularly the speckle noise occurring when rough surfaces are measured. The presence of speckle noise is detected using a new scalar indicator Kurtosis Ratio (KR), specifically designed to quantify the amount of random impulses generated by this noise. The KR is a ratio of the standard kurtosis and a robust estimate of kurtosis, thus indicating the outliers in the data. Since it is inefficient to reject the signals affected by the speckle noise, an algorithm for selecting an undistorted portion of a signal is proposed. The algorithm includes band-pass filtering and segmentation of the signal, as well as thresholding of the KR computed for each filtered signal segment.
- This paper presents a statistical technique to enhance vibration signals measured by Laser Doppler Vibrometry (LDV). The method has been optimised for LDV signals measured on bearings of universal electric motors and applied to quality control of washing machines. Inherent problems of LDV are addressed, particularly the speckle noise occurring when rough surfaces are measured. The presence of speckle noise is detected using a new scalar indicator Kurtosis Ratio (KR), specifically designed to quantify the amount of random impulses generated by this noise. The KR is a ratio of the standard kurtosis and a robust estimate of kurtosis, thus indicating the outliers in the data. Since it is inefficient to reject the signals affected by the speckle noise, an algorithm for selecting an undistorted portion of a signal is proposed. The algorithm includes band-pass filtering and segmentation of the signal, as well as thresholding of the KR computed for each filtered signal segment. (en)
- V tomto článku je navržena statistická metoda pro zlepšení vibračních signálů naměřených pomocí laserové Dopplerovské vibrometrie (LDV). Tato metoda byla optimalizována pro LDV signály z ložisek univerzálních elektrických motorů a byla aplikována pro kontrolu kvality domácích praček. Jsou diskutovány důležité problémy LDV, zejména pak tzv. speckle šum vznikající při měření opticky hrubých povrchů. Přítomnost tohoto šumu je detekována pomocí nového skalárního indikátoru Kurtosis Ratio (KR). KR je definováno jako poměr standartní špičatosti a robustního odhadu špičatosti, díky čemuž vyjadřuje přítomnost mimolehlých hodnot v datech. Jelikož je neefektivní vyřazovat signály zkreslené tímto šumem, je navržen algoritmus pro automatickou selekci nepoškozené části signálu. Tento algoritmus se skládá z pásmové filtrace, segmentace signálu a prahování hodnoty KR pro každý segment filtrovaného signálu. (cs)
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| Title
| - Avoidance of Speckle Noise in Laser Vibrometry by the Use of Kurtosis Ratio: Application to Mechanical Fault Diagnostics
- Avoidance of Speckle Noise in Laser Vibrometry by the Use of Kurtosis Ratio: Application to Mechanical Fault Diagnostics (en)
- Redukce speckle šumu v laserové vibrometrii pomocí poměru špičatostí: Aplikace v diagnostice mechanických závad (cs)
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| skos:prefLabel
| - Avoidance of Speckle Noise in Laser Vibrometry by the Use of Kurtosis Ratio: Application to Mechanical Fault Diagnostics
- Avoidance of Speckle Noise in Laser Vibrometry by the Use of Kurtosis Ratio: Application to Mechanical Fault Diagnostics (en)
- Redukce speckle šumu v laserové vibrometrii pomocí poměru špičatostí: Aplikace v diagnostice mechanických závad (cs)
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| skos:notation
| - RIV/68407700:21230/08:03138541!RIV09-MSM-21230___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
| - P(GD102/03/H085), Z(MSM6840770015)
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/68407700:21230/08:03138541
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - kurtosis; laser vibrometer; rolling element bearing; speckle noise; universal electric motor; washing machine (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - GB - Spojené království Velké Británie a Severního Irska
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Mechanical Systems and Signal Processing
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Sovka, Pavel
- Šmíd, Radislav
- Vass, Jiří
- Cristalli, C.
- Randall, R. B.
- Torcianti, B.
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| http://linked.open...ain/vavai/riv/wos
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| http://linked.open...n/vavai/riv/zamer
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| issn
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| number of pages
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| http://localhost/t...ganizacniJednotka
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