Prusak Y. Regularity of elastic-viscous state of wood in the process of drying taking into account cylindrical anisotropy

The object of research - the deformation of round timber during convective drying. The purpose - the mathematical models developing and the regularity of moisture transfer and viscoelastic deformation of round timber during convective drying with including the cylindrical anisotropy of material. Methods - of inherited environments mechanics and thermal-mass transfer; finite elements; object-oriented programming; approximation; mathematical statistics. Scientific novelty. New mathematical model of viscoelastic deformation of round timber with including cylindrical anisotropy during drying is constructed, which unlike others allow for the distribution of non-symmetrical moisture influence on viscoelastic deformation and deformation caused by sorption creep; the first time obtained depending unsteady of non-symmetrical distribution of moisture in round timber with including the cylindrical anisotropy of thermal properties for occasional and regular modes of convective drying process; the first time the two-dimensional viscoelastic deformation of round timber assortments in the drying process was research, taking into account the anisotropy of mechanical properties of the material, which allows you to set patterns non-symmetrical moisture transfer impact on the development of normal and tangential stress changes depending on the angle of coning and curvature of growth rings; formulated and solved the problem of new optimization parameters determining the parameters of air of round timber assortments with regard to restrictions on the tension. Practical meaning. The mathematical models and application software can be used to create automated calculation of temperature, humidity and component stress during drying of round timber to drying equipment upgrade and the development of new rational technologies of drying. Based on constructed the mathematical models and algorithms of developed to the proposed method of control viscoelastic deformation of wood in the drying process in terms of deterrence drying out. The results of the thesis is used on "Ledas-Ukraine" (Hust) for calculate the fields of temperature, humidity and stress components in round timber during drying, allowing justify the choice of operating parameters for the desired product quality. Area of uses: woodworking.