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Theses

Détermination des facteurs influençant la coupe et la qualité des plaquettes issues du déchiquetage du bois par des machines forestières

Abstract : Chipping wood of second quality is a rapidly growing process because of the increasing use of the biomass in energy production field. The utilization of wood chips as a combustible, make it easier to automate the wood boilers function. Few studies were carried out in order to understand the mechanism of the chip formation and the evolution of cutting force during the chipping operation. In this thesis, we focused our analysis on the disc chipper. A test bench of real dimensions was built up in order to be able to vary many parameters such as cutting and feeding speed, cutting angles, feeding direction, anvil height, cutting directions, knives number and their height. Experimental study showed that chip size grows when the feeding tooth, the cutting angle and the sharpness angle increase, whereas it decreases when the cutting speed increases. The process of the chip formation is composed of two mechanisms that are shear and cracks propagation. Measurement of cutting force and electric power consumption for a bandwidth up to 3 kHz bring important results to the chip size study. The chipping test bench allowed us to reveal the correlation or the independency between the parameters needed to optimize the chipping operation
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Rami Abdallah. Détermination des facteurs influençant la coupe et la qualité des plaquettes issues du déchiquetage du bois par des machines forestières. Autre. Université Henri Poincaré - Nancy 1, 2010. Français. ⟨NNT : 2010NAN10096⟩. ⟨tel-01746359⟩

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