TAILIEUCHUNG - Báo cáo lâm nghiệp: "Online control of wood peeling process: Acoustical and vibratory measurements of lathe checks frequency"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Online control of wood peeling process: Acoustical and vibratory measurements of lathe checks frequency. | Ann. For. Sci. 64 2007 569-575 INRA EDP Sciences 2007 DOI forest 2007034 Available online at Original article Online control of wood peeling process Acoustical and vibratory measurements of lathe checks frequency Louis Étienne DENAUDa Laurent BLÉRONb Alain RATLEc Rémy MARCHALb a LGMT IUT Paul Sabatier département GMP 1 rue Lautréamont University of Toulouse III France b LABOMAP ENSAM rue Porte de Paris 71250 Cluny France c LRMA - ISAT 49 rue Mademoiselle Bourgeois 58000 Nevers France Received 4 July 2006 accepted 18 January 2007 Abstract - 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 . peeling process acoustic vibration lathe checks Résumé - Contrôle en ligne du déroulage du bois mesure acoustique et vibratoire des frequences de fissuration du placage. Dans de nombreuses opérations d usinage les opérateurs expérimentés sont à même de déceler l apparition d un problème en écoutant les sons émis par le procédé. Cela est particulièrement vrai dans le cas du déroulage. La fissuration cyclique du placage a été identifiée comme l un des phénomènes détectables par les opérateurs sur dérouleuse. Des .

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