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Wood peeling process monitoring: a comparison of signal processing methods to estimate veneer average lathe check frequency

Prozessüberwachung beim Holzschälen: Vergleich verschiedener Verfahren zur Bestimmung der mittleren Rissfrequenz bei Schälfurnieren

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Abstract

Experienced peeling operators are able to adjust the settings of their device by hearing the sound coming from the process. Based on this idea, a research program was undertaken to evaluate the possibility of using acoustic or vibration measurements supplying a support decision system to assist untrained operators.

The present paper deals with lathe check phenomenon which is one of the most critical defects of veneer (leading to handling difficulties, excess of glue consumption, poor veneer surface quality, etc.). Several signal processing techniques giving a spectral representation of sensors measurements are compared. Finally, an original procedure based on Power Spectral Density ratio is proposed to measure the average lathe check frequency of the veneer during the process.

Zusammenfassung

Erfahrene Schälmaschinenführer können die Maschineneinstellungen nach Gehör vornehmen. Davon ausgehend wurde ein Forschungsprogramm initiiert, in welchem untersucht werden soll, ob Schall- oder Schwingungsmessungen als Entscheidungshilfe für unerfahrene Arbeiter genutzt werden können.

Die vorliegende Studie beschäftigt sich mit Schälrissen, einem der kritischsten Mängel bei Furnieren, die zu Schwierigkeiten bei der Bearbeitung, wie z. B. übermäßigem Klebstoffverbrauch oder schlechter Qualität der Furnieroberflächen führen können. Verschiedene Signalverarbeitungsverfahren, die eine spektrale Darstellung der Sensormessungen liefern, werden verglichen. Abschließend wird ein neues Verfahren zur Messung der mittleren Rissfrequenz bei Furnieren vorgeschlagen, das auf dem spektralen Leistungsdichteverhältnis (PSD) basiert.

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Abbreviations

V c :

Cutting speed (m/s)

f check :

average lathe check frequency (Hz)

L :

veneer length (m)

n :

number of cracks

RMS:

Root Mean Square

PSD:

Power Spectral Density

S xx (f):

Autospectrum of x(t)

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Authors and Affiliations

  1. LaBoMaP, Arts et Metiers–ParisTech, Rue Porte de Paris, 71250, Cluny, France

    Louis Etienne Denaud, Laurent Bléron & Rémy Marchal

  2. Institut Clément Ader, University Paul Sabatier–IUT Tarbes, Département Génie Mécanique et Productique, 1 rue Lautréamont, BP 1624, 65016, Tarbes, France

    Florent Eyma

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  1. Louis Etienne Denaud
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  2. Laurent Bléron
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  3. Florent Eyma
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  4. Rémy Marchal
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Correspondence to Louis Etienne Denaud.

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Denaud, L.E., Bléron, L., Eyma, F. et al. Wood peeling process monitoring: a comparison of signal processing methods to estimate veneer average lathe check frequency. Eur. J. Wood Prod. 70, 253–261 (2012). https://doi.org/10.1007/s00107-011-0549-8

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