Mayevskyy V. Scientific and technological basis of sawn timber production with consideration for shape and dimensional-and-qualitative characteristics of timber

Object of research - technological process of sawn timber production. Aim of work - development of the scientific and technological bases of sawn timber production constituting a scientific basis for choice of rational decisions in technological process of sawn timber production with consideration of shape and dimensional-and-qualitative characteristics of logs and optimization of sawing scheme. Methods of research: mathematical statistics, experimental methods, solid simulation, mathematical simulation, numerical methods, fuzzy sets theory. Scientific novelty. A new mathematical model of log with consideration of its shape as a set of 2D scans obtained during scanning of log cross sections for log length and described by partial sum of trigonometric Fourier series is developed. Within the developed theoretical approach to simulation of external knots, reaching the log pith, the method for determining of knot size and its placement on sawn timber is developed. First the mathematical model of log sawing on sawn timber based on their shape and rotation around their linear regression axis at the fixed angle during sawing by sawmill machines with a vertical or horizontal placement of the cutting tool is developed. First using of fuzzy expert systems for consideration of current suboptimal decisions in sawing process is provided for optimization of log sawing. Practical importance. The developed software for simulation of log shape including external defects and sawing of obtained log models into sawn timber with optimization of sawing scheme allows the log sorting according to their shape and external defects, optimal log placement prior to their sawing and ensure rational use of timber. Technological possibility of log sawing at the angle to its linear regression axis into sawn timber with original U-and O-like texture of wood is confirmed by experimental investigations. Obtained wood texture diversifies aesthetics and exclusivity of wood products. Priority of obtained results is confirmed by the patent for invention and useful model patents concerning methods: the production of glued boards with wood texture conservation, sawing of log at the angle to its axis and measurement of lumber diameters. Sphere of research - woodworking.