Faculty of Mechanical Engineering,Transilvania University of Brasov, 29 Eroilor, 500036, Brasov, Romania.
Department of Product Design Mechatronics and Environment, Transilvania University of Brasov, 29 Eroilor, 500036, Brasov, Romania.
Int J Biol Macromol. 2024 Aug;274(Pt 1):133310. doi: 10.1016/j.ijbiomac.2024.133310. Epub 2024 Jun 21.
In the acoustics of musical instruments with a resonator body, the aging of the wood leads to the improvement of the acoustic properties due to increasing the crystallinity of wood. This phenomenon could be explained by the fact that wood is a complex product based on three-dimensional polymer chains of carbohydrates, its aging being closely related to covalent cross-linking and scission of polymer chains. The aim of this study was to evaluate at a multiscale the changes produced artificial aging of tone wood by measuring the acoustic, mechanical and chemical parameters. The spruce and maple wood samples were investigated before and after exposure to ultraviolet (UV) radiation, through the tensile test, the time-of-flight method (TOF), the analysis of the wood color and the determination of the chemical fingerprint through Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The obtained results showed that the effects of artificial aging are manifested at the chemical level where the crystallinity increases up to the acoustic level, depending on the wood species and their quality class. These results are relevant for musical instrument manufacturers to find treatments that lead to superior acoustic properties.
在带共鸣体的乐器声学中，木材的老化会导致木材结晶度增加，从而改善其声学特性。这种现象可以用以下事实来解释：木材是一种基于碳水化合物三维聚合物链的复杂产品，其老化与聚合物链的共价交联和断裂密切相关。本研究的目的是通过测量声学、力学和化学参数，在多尺度上评估音调木材的人工老化所产生的变化。通过拉伸试验、飞行时间法（TOF）、木材颜色分析以及傅里叶变换红外光谱（FTIR）和 X 射线衍射（XRD）确定化学指纹，研究了云杉和枫木样本在暴露于紫外线（UV）辐射前后的情况。结果表明，人工老化的影响在化学水平上表现出来，结晶度增加到声学水平，这取决于木材种类及其质量等级。这些结果对于乐器制造商寻找能够产生更好声学特性的处理方法具有重要意义。
