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    林斌, 苗媛媛, 李瑞, 金祥龙, 李慕之, 刘镇波. 桦木单板/玻璃纤维复合材料声学振动性能的研究[J]. 北京林业大学学报, 2019, 41(1): 126-133. DOI: 10.13332/j.1000-1522.20180317
    引用本文: 林斌, 苗媛媛, 李瑞, 金祥龙, 李慕之, 刘镇波. 桦木单板/玻璃纤维复合材料声学振动性能的研究[J]. 北京林业大学学报, 2019, 41(1): 126-133. DOI: 10.13332/j.1000-1522.20180317
    Lin Bin, Miao Yuanyuan, Li Rui, Jin Xianglong, Li Muzhi, Liu Zhenbo. Acoustic vibration properties of birch veneer/glass fiber composites[J]. Journal of Beijing Forestry University, 2019, 41(1): 126-133. DOI: 10.13332/j.1000-1522.20180317
    Citation: Lin Bin, Miao Yuanyuan, Li Rui, Jin Xianglong, Li Muzhi, Liu Zhenbo. Acoustic vibration properties of birch veneer/glass fiber composites[J]. Journal of Beijing Forestry University, 2019, 41(1): 126-133. DOI: 10.13332/j.1000-1522.20180317

    桦木单板/玻璃纤维复合材料声学振动性能的研究

    Acoustic vibration properties of birch veneer/glass fiber composites

    • 摘要:
      目的面对我国乐器音板用材资源的严重不足,寻找新材料替代传统乐器木质音板用材是非常有必要的。
      方法本试验以玻璃纤维为增强材料,桦木单板为基体,按照单板层积材结构设计制备桦木单板/玻璃纤维复合材料。通过对玻璃纤维复合材料声学振动性能检测分析,探究玻璃纤维布的不同铺放位置和铺放层数对复合材料声学振动性能的影响。
      结果用1层玻璃纤维布铺放在表层单板下的复合材料A的比动弹性模量和E/G值分别为22.20GPa和16.55,比用1层玻璃纤维布铺放在芯层单板单侧的复合材料B分别高了8.7%、17.8%。用2层玻璃纤维布分别铺放在上下表层单板内的复合材料C的比动弹性模量和E/G值分别为25.04GPa和17.04,比用玻璃纤维布铺放在芯层单板两侧的复合材料D高了7.5%和18.0%。纤维铺放位置对声辐射品质常数和声阻抗的影响较小。玻璃纤维布的层数与复合材料的声学振动性能不成线性关系,铺放2层玻璃纤维布的复合材料具有较高的比动弹性模量和E/G值。玻璃纤维布铺放3层和4层的复合材料的比动弹性模量和E/G比铺放2层的都小。随着玻璃纤维布层数的增加,声辐射品质常数呈减小的趋势。通过综合评分法分析发现:玻璃纤维布铺放在表层单板下的复合材料综合评分值都高于铺放在靠近芯层单板的复合材料,铺放2层玻璃纤维布的复合材料的综合评分值达到最大。
      结论玻璃纤维布铺放在表层单板下的复合材料声学振动性能优于纤维布铺放在靠近芯层单板的复合材料。铺放2层玻璃纤维布的复合材料C的声学振动性能达到最好。尽管复合材料C的E/G值约为西加云杉的80%,但比动弹性模量和西加云杉的相接近,说明桦木单板/玻璃纤维复合材料具有替代传统木质音板用材的可能性。

       

      Abstract:
      ObjectiveIt is very necessary to find new materials to replace the traditional wood materials for sound boards in China because of the serious shortage of wood materials for sound boards in our country.
      MethodIn this paper, birch veneer/glass fiber composites were prepared using glass fiber as reinforcement and birch veneer as matrix according to the structure design of veneer laminated building blocks. By testing and analyzing the acoustic and vibration properties of the composites, the effects of the placement position and the number of layers of glass fiber cloth on the acoustic and vibration properties of the composites were investigated.
      ResultThe specific dynamic elastic modulus and E/G value of composite A with one layer of glass fiber cloth under the surface layer were 22.20GPa and 16.55, respectively, which were 8.7% and 17.8% higher than those of composite material B with one layer of glass fiber cloth at the center layer. The specific dynamic elastic modulus and E/G value of composite C with two layers of glass fiber cloth in the upper and lower layers were 25.04GPa and 17.04, respectively, which were 7.5% and 18% higher than those of composite material D with glass fiber cloth in the center layer. The placement of fiber had little effect on acoustic radiation quality constant and acoustic impedance. There were no linear relationships between the layers of glass fiber cloth and the acoustic vibration properties of the composites. The composites with two layers of glass fiber cloth had better specific dynamic elastic modulus and E/G value. The specific dynamic elastic modulus of the composites with three or four layers of glass fiber cloth was lower than that of the composites with two layers of glass fiber cloth. With the increase of the number of layers, the sound radiation quality constant decreased. Through the comprehensive coordinate analysis, it was found that the composite score of glass fiber cloth on the surface was higher than the central layer, and the composite score of two layers of glass fiber cloth reached the maximum.
      ConclusionThe acoustic vibration properties of the composites with glass fiber cloth on the surface layer were better than those with glass fiber cloth on the center layer. The composite C with 2 layers of glass fiber cloth has the best acoustic vibration performance. Although the E/G value of composite C is about 80% of Picea sitchensis, the specific dynamic modulus of elasticity is similar to Picea sitchensis, indicating that the birch veneer/glass fiber composite has the possibility of being used as a wood substitute for musical instruments.

       

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