纤维增强树脂基夹芯复合材料隔声性能的研究

Study on Sound Insulation Performance of Fiber Reinforced Resin Sandwich Composite

本文对轨道交通车辆安装复合材料头罩的驾驶室进行隔声研究,先从双层纤维增强树脂基夹芯复合材料对称结构和非对称结构的隔声性能进行研究,再对三层纤维增强树脂基夹芯复合材料结构的隔声性能进行探究,接着进一步探究阻尼材料、隔声材料对纤维增强树脂基夹芯复合材料隔声性能的影响,最后根据驾驶室的实际情况,探究空气层和内饰件产品对驾驶室隔声性能的影响。结果表明,对于双层纤维增强树脂基夹芯复合材料结构,在声源侧分配厚的纤维层,比平均分配两侧纤维层可获得更高的隔声性能;对于三层纤维增强树脂基夹芯复合材料结构,将厚度最大的纤维层置于近声源端,将厚度次之的纤维层置于远声端,将厚度最小的纤维层置于中间的结构,其隔声量明显优于双层纤维增强树脂基夹芯复合材料结构;在复合材料背面增加阻尼材料或隔声材料都可提高其隔声性能;考虑内饰件及空气层时,驾驶室的隔声量可提高。

In this paper,the sound insulation of cab of rail transit vehicle installed with composite headcover is studied.First,the sound insulation performance of symmetrical structure and asymmetric structure of double-layer fiber reinforced resin sandwich composite is studied,and then the sound insulation performance of three-layer fiber reinforced resin sandwich composite structure is explored.Then,the influence of damping material and sound insulation material on the sound insulation performance of fiber reinforced resin sandwich composite material is further explored.Finally,according to the actual situation of the cab,the influence of air layer and interior decoration products on the sound insulation performance of the cab is explored.The results show that for the double-layer fiber reinforced resin sandwich composite structure,the sound insulation performance is higher when the thick fiber layer is distributed on the sound source side than when the fiber layer is evenly distributed on both sides.For the three-layer fiber reinforced resin sandwich composite structure,the thickest fiber layer is placed at the near sound source,the thickest fiber layer is placed at the far sound end,and the thickest fiber layer is placed in the middle.The sound insulation capacity of the structure is obviously better than that of the double-layer fiber reinforced resin sandwich composite structure.Adding damping material or sound insulation material on the back of the composite can improve the sound insulation performance.Considering the interior and air layer,the sound insulation of the cab can be improved.