Modeling of the Rotational Motion of Large-Sized Wood Particles

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UDС

674.815-41

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Abstract

For the angle minimization of particles packing in shaving mat at the OSB manufacturing the optimal velocity of orienting tool directional elements must be choosen, considering the deacceleration of particle rotation. Taking into account the laminar streamline of air wood particles the numerical experiment was run. As a result the velocity field of flow around rotating particle is received, the particle aerodynamic drag coefficient is defined, which takes values ??from 1.12 to 1.20. The modeling was carried out for the particles, used in the manufacture of OSB, with a length of 150 mm, a width of 4…30 mm, a thickness of  0.2…1 mm. Service simulating test with the packaged programs MatLab Simulink showed that actuating linear aerodynamic drag force during the rotation of particles increases nonlinearly with the augment of particle size. During the orientation the angular rate of the particle with length of 150 mm decreases comparatively to the initial velocity by 18%, and the particles with length 75 mm – by 12%. This degradation increases linearly with decreasing density of particles. Deacceleration intensity of the flat particles during rotation is proportional to its thickness, is inversely to its compactness and is not dependent on the width of the particle. The modeling results is substantiated by speed camera shooting. The angular rate of the particles, which has the minimal angle of laying in the mat, is determined subject to the aerodynamic deacceleration of the particles from falling and rotation, turning (falling) time, and the initial descent of the particles from the directional elements, which depends on the distance between the elements and the particle length. Improved value of the rotational velocity of large-sized particles minimizes stacking angle them in shaving mat owing to impart the angular impulse. This increases the flexural strength of the finished OSB.

Authors

Plotnikov S.M., Doctor of Engineering, Professor Lurie M.S., Doctor of Engineering, Professor Siberian State Technological University Mira, 82, Krasnoyarsk, 660049, Russia E-mail: smplotnikov@rambler.ru

Affiliation

Siberian State Technological University

Keywords

flat particle, simulation model, moment of inertia, angular impulse, aerodynamic drag coefficient, OSB.

References

For the angle minimization of particles packing in shaving mat at the OSB manufacturing the optimal velocity of orienting tool directional elements must be choosen, considering the deacceleration of particle rotation. Taking into account the laminar streamline of air wood particles the numerical experiment was run. As a result the velocity field of flow around rotating particle is received, the particle aerodynamic drag coefficient is defined, which takes values ​​from 1.12 to 1.20. The modeling was carried out for the particles, used in the manufacture of OSB, with a length of 150 mm, a width of 4…30 mm, a thickness of 0.2…1 mm. Service simulating test with the packaged programs MatLab Simulink showed that actuating linear aerodynamic drag force during the rotation of particles increases nonlinearly with the augment of particle size. During the orientation the angular rate of the particle with length of 150 mm decreases comparatively to the initial velocity by 18%, and the particles with length 75 mm – by 12%. This degradation increases linearly with decreasing density of particles. Deacceleration intensity of the flat particles during rotation is proportional to its thickness, is inversely to its compactness and is not dependent on the width of the particle. The modeling results is substantiated by speed camera shooting. The angular rate of the particles, which has the minimal angle of laying in the mat, is determined subject to the aerodynamic deacceleration of the particles from falling and rotation, turning (falling) time, and the initial descent of the particles from the directional elements, which depends on the distance between the elements and the particle length. Improved value of the rotational velocity of large-sized particles minimizes stacking angle them in shaving mat owing to impart the angular impulse. This increases the flexural strength of the finished OSB.