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-  2018 

基于木材微观特性的胶合板隔声量模拟

DOI: 10.13360/j.Issn.2096-1359.2018.03.007

Keywords: 传递函数, 隔声量预测, 木材微观特性, 胶层, 胶合板
transfer function
, sound insulation prediction, wood microscopic characteristics, bonding interface, plywood

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Abstract:

基于Biot理论的隔声模型,将马尾松等效为某一介质,通过木材微观特性(管胞长度、管胞直径、纹孔和孔隙率等),确定马尾松参数与等效介质密度和体积弹性模量之间的函数关系,对马尾松胶合板的隔声量进行预测。借助Matlab软件编制隔声量的相应计算程序软件,同时,通过Matlab软件运用复合材料的弹性模量公式,预测马尾松胶合板的弹性模量。通过隔声量实测与模拟值比较可知,马尾松胶合板的隔声量实测值与理论值相吻合。对马尾松早晚材分开进行胶合板隔声量计算,并引入胶层的概念,从而提高隔声量预测的准确性。通过预测马尾松胶合板的弹性模量,进而计算出其相对应的临界频率,将模拟临界频率与实测临界频率进行对比分析。研究表明:酚醛树脂所制胶合板的隔声量高于脲醛树脂所制胶合板,同时,酚醛树脂对抑制吻合效应具有积极的作用; 随着胶合板层数的增加,隔声量也相应有所提高,临界频率向高频移动,吻合谷变浅,有效抑制了吻合效应。本研究中的隔声量预测模型可为木质复合材料的隔声量预测提供有效参考。
The insulation predictions of Masson pine(Pinus massoniana)plywood were carried out in order to evaluate the sound properties. The theoretical value of sound insulation was predicted by regarding the substances in wood cell wall as equivalence to specific medium based on Biot mode. The wood anatomical characteristics, such as the length and diameter of tracheid, diameter of pit and porosity, were taken into account for determining the equivalent density and bulk modulus of elasticity of wood cell wall. In this paper, the software of calculation program for sound insulation was compiled with the Matlab software, and the elastic modulus of the Masson plywood was predicted by composite modulus formula using the Matlab software. By comparing the tested and predicted values of sound insulation, the results were drawn as follows: the predicted values of sound insulation were significantly correlated with the experimental values for the Masson pine plywood. As for the Masson pine, the adjacent of earlywood and latewood was considered as sandwich structure for the calculation of sound insulation. Meanwhile, the bonding interface was involved to improve the accuracy of sound insulation prediction. By predicting the elastic modulus of the Masson plywood, the corresponding critical frequency was calculated, and the simulated critical frequency was compared with the measured critical frequency. The tested results showed that the sound insulation of plywood with phenol-formaldehyde resin was higher than that of the plywood with urea-formaldehyde resin, and it was revealed that the phenol-formaldehyde resin played a positive role in inhibiting the coincidence effect. With the increase of plywood layers, the sound insulation increased, the higher critical frequency was obtained and the anastomotic valley become shallow, and the coincidence effect was effectively inhibited. The transfer function involved in the sound insulation prediction could provide an effective reference to describe the sound insulation volume of wood-based composites in the construction and decoration areas

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