DIFFERENT WAYS OF ELASTIC MODULUS COMPARATIVE STUDY TO PREDICT RESONANT PROPERTIES OF STANDING SPRUCE WOOD

摘要

Resonant method of determining modulus of elasticity and shift and decrement of fluctuations' operates in Russia to determine elastic-viscous properties of wood (GOST 16483.31-197474). The method is destroying and demanding much time and expenses for manufacturing pre-production models in the form of rectangular bar sized 20x20x300 mm, which requires tree cutting down, severing, sawing, etc.; as a consequence, it has not found wide implementation in the practice of research and, especially, selection of qualitative material for musical instruments manufacturing.