空气滤清器内吸声材料位置研究

Investigation on absorptive material placement in air cleaner

室内声学研究证明,在高声压区域布置吸声材料能够有效地抑制低频模式,提高室内的低频声学性能。为进一步提高空气滤清器的消声量,结合该项研究成果,提出通过在空气滤清器模态高声压集中区域布置吸声材料的方法,来实现消声量的增加。采用有限元方法,建立类似于方形箱体的简化空气滤清器模型,得到内部空腔共振模式,发现高声压区域主要集中于腔体角部和棱边,在上述高声压集中区域布置吸声材料,以提高空气滤清器的消声效果,计算结果显示,在中高频传递损失有较大提高,并且优于增加等量滤纸厚度方法。将以上方法用于某型号空滤器设计中,通过空腔的模态分析,发现模态高声压集中区域,并布置吸声材料,传递损失计算结果证明方法合理可行,能够有效地用于实际空气滤清器以提高进气系统消声量。

In order to improve the transmission loss in air cleaner,a method of properly placing absorptive material in cleaner was proposed.Applying finite element method,a simplified air cleaner was modeled as a cubic chamber with smaller sizes.The modal analysis results show that the modes maximum pressure regions of the acoustic modes concentrate at the corners and edges of the chamber.At these regions,the absorptive material was placed to improve the transmission loss.It can be seen that the transmission loss is improved greatly in mid and high frequency ranges and the result is better than that by the method of increasing the thickness of filtering paper.Applying the procedure to a real design of air cleaner testifies the procedure is reasonable and feasible.It can be applied in air cleaner design to increase the mid and high frequency components of transmission loss of air intake systems.