Online control of wood peeling process: acoustical and vibratory measurements of lathe checks frequency
TypeArticles dans des revues avec comité de lecture
In the course of most wood machining processes, operators are usually able to detect various problems simply by hearing the sound emitted by the process. This is especially true for wood peeling. Lathe checks formation has been identified as one of the typical situations that an experimented peeler can detect. Poplar and beech veneer samples have been produced on a laboratory microlathe, using working conditions deliberately favourable to checking. Forces, sound, and vibration levels were measured during the tests. The lathe check frequencies have been determined on both sound and vibration signals using a local Root Mean Square (RMS) averaging and a peak detection algorithm. This makes possible the evaluation of lathe checks distribution along the veneer length. The technique was validated by measuring the real veneer profile using a specific apparatus developed by IVALSA-CNR in Trento (Italy).
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Cutting Forces in basic and real life wood machining processes review, COST Action E35 2004-2008: Wood machining - Micromechanics and fracture MARCHAL, Rémy; MOTHE, Frédéric; DENAUD, Louis; THIBAUT, Bernard; BLERON, Laurent (De Gruyter, 2009)The data available in the literature concerning wood cutting forces permit to build models or to simulate the main wood machining processes (milling, sawing, peeling etc.). This approach contributes to a better understanding ...
Wood peeling process monitoring: a comparison of signal processing methods to estimate veneer average lathe check frequency DENAUD, Louis; BLERON, Laurent; EYMA, Florent; MARCHAL, Rémy (Springer, 2012)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 ...
BLERON, Laurent; DENAUD, Louis; COLLET, Robert; MARCHAL, Rémy (Lavoisier, 2011)Since the test method for compression strength perpendicular to the grain was changed from a partial area to a full area loading test, strength values for softwood in EN 338 were significantly reduced. Consequently, a ...
The effect of log heating temperature on the peeling process and veneer quality: beech, birch, and spruce case studies DUPLEIX, Anna; DENAUD, Louis; BLÉRON, Laurent; MARCHAL, Rémy; HUGHES, Mark (Springer, 2013)Heating green-wood prior to peeling is necessary to improve both peeling process and quality of veneer. This study investigates optimum heating temperatures by soaking of beech, birch and spruce. Experiments have studied ...
PAŁUBICKI, Bartosz; MARCHAL, Rémy; BUTAUD, Jean-Claude; DENAUD, Louis; BLERON, Laurent; COLLET, Robert; KOWALUK, Grzegorz (Springer-Verlag, 2010)In the present paper, a novel method for veneer checks measurement and description based on digital image analysis is evaluated. According to this method, the camera is located sideways to the veneer allowing for viewing ...