Open AccessResearch of plywood quality by acoustic methods
Author(s) -
Olena Pinchevska,
Olha Baranova,
O Y Gorbachova,
V M Gandzuk
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/708/1/012098
Subject(s) - shock (circulatory) , nondestructive testing , distortion (music) , materials science , acoustics , quality (philosophy) , process (computing) , process engineering , structural engineering , computer science , engineering , physics , medicine , amplifier , optoelectronics , cmos , quantum mechanics , operating system
Traditionally, for composite materials, glued wood and solid wood are used nondestructive methods of control that take into account the specific features of the object. Plywood is a non-metal anisotropic material of complex structure, so most non-destructive testing methods, such as magnetic and eddy current methods are excluded. For choosing a method, it should also be borne in mind that plywood is a large product and may have significant size defects. The shock method is easier to implement than other non-destructive testing methods, so it can be considered effective for plywood defectoscopy. The existing classical shock method is carried out by the absolute values of the deviations of the characteristics of the oscillatory processes of the plywood. Changing the variable factors of plywood may reduce the accuracy of the device being implemented. Therefore, a technique for improving the shock method by measuring the relative characteristics of the oscillation process was developed. Comparison with the known, most accurate ultrasonic method of control revealed that the highest correlation with ultrasound has such a parameter of the shock sensor as the coefficient of harmonic distortion, which gives reason to recommend the shock method for determining the area defect plywood.