Evaluation of Viscous-Elastic Properties of Resonance Maple Wood

Abstract

The paper presents the experimental investigations regarding the viscoelastic behaviour of maple wood used in the construction of stringed musical instruments. The studied samples were classified according to the anatomical structure of the wood in the four classes of anatomical quality used by the manufacturers of musical instruments. Based on the mechanical analysis in dynamic regime, the viscoelastic parameters were determined - the preservation module E', the loss modulus E' and the damping tan δ, in conditions of constant temperature, respectively variable temperature. It was found that the determined rheological quantities depend on the anatomical structure of the wood, the frequency of the excitation and the temperature.

Identification of Damping of Spruce Wood (Picea abies) under Various Levels of Moisture Content Using Time-Scale Decomposition

“…Temperature also plays an important role in damping the vibrations of wood. The influence of heating on the damping properties of maple and Douglas fir was studied by Mihalcica et al [17] and Jiang et al [18], who found that damping first increases and then decreases with increasing temperature.…”

“…This article aims to present the determination of the damping of wood on the first three bending vibration modes using the wavelet transform, which has received little attention to date despite the extensive literature on WT. In contrast, many papers in the literature research the damping of wood under various conditions [3][4][5][6]9,12,14,15,17], using the predominant inaccurate methods being based on either the logarithmic decrement or the 3 dB method. The aim is also to compare the wavelet transform with the method of vibration envelope fitting as an improved version of the well-known logarithmic decrement for damping determination in the first vibration mode.…”