FIELD: measuring equipment.SUBSTANCE: invention relates to the field of diagnostics of the physical and mechanical properties of wood aged in old structures. Method comprises the use of tools for sampling wood and the subsequent determination of its physical and mechanical properties, and express diagnostics of the resonant properties of wood is carried out through their examination, revealing the location of walls and other structural elements relative to the sides of the world and the prevailing wind rose of a particular region; to determine the locations of sampling and express diagnostics of the resonant properties of wood in a strictly radial direction, fixed rigidly on the opposite ends of each structural element to be examined, so that their straight working surfaces pass through the core of the wood being examined; the free ends of the strips should extend no less than 100 mm from the outer surface of the structural element, while on their working surfaces there are fixed two fastening elements, one of which is located at the outer surface of the wood being examined, and the other is at a certain distance from it closer to the free end of the bar, on which the connecting elements are connected, connecting the slats of the opposite ends of the structural element, forming a secant plane in the radial direction, which is the direction of submission of the working body of the bur for research in measuring the resistance of wood to the boring and determination of the characteristics of aged wood.EFFECT: increase in the accuracy and speed of diagnostics is achieved.1 cl, 4 dwg

Method for express diagnostics of the resonant properties of aged wood in old structures

FIELD: agriculture; wood-working industry.SUBSTANCE: invention relates to forestry. Method is that at the age of 15–20 years in the artificial or natural plantations of European spruce trees having high class of bonitet (Ia–II), target trees which will be part of the final felling stand are selected. Trees shall be straight, healthy, with a good shape of the trunk and a uniformly comprehensively developed crown. These trees shall be located uniformly over the area and do not have large branches and knots. On the selected trees, in order to maximize the production of valuable wood using a rod-type pole sow, a 3-way cutting of branches and knots is carried out to a height of 2 m, in 5 years – to 4 m, and in next 5 years – to 6 m. Thus, by the age of 25–30 years, a 6-meter knot-free zone of the butt-log portion of the trunk shall be formed, with at least 8–10 upper live whorls left in each tree.EFFECT: method provides an improvement in the resonant properties of European spruce.1 cl

Method for forming resonant wood from the european spruce

FIELD: physics. ^ SUBSTANCE: method for early detection of resonance properties of standing wood, mainly undergrowth, by determining dendro-acoustic properties of the analysed sample, involves taking samples in form of cuttings from fir undergrowth from the sunny side of the middle side branches, except the last three-year old shoots. Natural frequency of vibration of the collected cuttings is determined using a resonance technique. The frequency-amplitude histogram is obtained in automatic mode using a personal computer with a full duplex sound card and a program. The frequency-amplitude histogram is identified with a reference histogram obtained beforehand, taking into account density and actual thickness of the cuttings. Presence of resonance properties in the undergrowth is determined from the identification results with given degree of probability of not less than 0.95. ^ EFFECT: method increases accuracy of detecting resonance properties of standing wood. ^ 1 dwg, 1 ex

Fedjukov Vladimir Il Ich

Papers

Method for early detection of resonance properties of standing wood