玻璃纤维复合材料板隔声性能的研究

选择树脂基玻璃纤维复合材料板，测量其辐射效率和损耗因子，研究纤维排布方式及纤维用量的影响，结果表明，纤维正交和单向铺设对玻璃纤维板辐射效率的影响基本相同，纤维的用量在10%~70%变化时，也没有明显的变化；对损耗因子的影响，在160~1000Hz范围内，单向玻纤复合材料板的阻尼比正交排布的低，而在2000~8000 Hz范围两者基本相同的。在中低频范围内，正交排布比单向排布对阻尼的影响更加显著。通过测试复合材料和金属铁的隔声量，在160~8000Hz范围内，玻璃纤维复合材料板没有出现隔声谷。提出纤维复合材料板中纵波波速公式，计算复合材料板的隔声量，与测量结果吻合良好。

Experimental study of sound insulation performance of glass fiber reinforced composite plates

To investigate effects of fiber arrangement and amount on sound transmission of resin-based glass fiber composite plates, the relevant radiation ratio and loss factor have been measured. The experiments identify that the radiation ratios of orthogonal and parallel arrangements are the same, as well as when the fiber amount increased from 10% to 70%. As for the effect on the loss factor, the damping ratio of parallel arrangement is lower than that of orthogonal arrangement in the frequency range of 160 Hz to 1000 Hz. The damping ratios of orthogonal and parallel arrangements are close to each other from 2000 Hz to 8000 Hz. In medium and low frequency range, the orthogonal arrangement affects the damping ratio more significantly than the parallel arrangement does. Comparing the sound transmission losses of resin-based glass fiber composite plates with iron, it is found that there is no sound insulation valley in the sound transmission loss curve of the composite s plates. The calculation method of the longitudinal wave has been developed. The calculation results are in agreement with the experimental results.