Research on room acoustics shows that the proper position for the absorptive material is the region with modes’ maximum pressure gathered. It is seen that the proper position contributes greatly to the flatness of the acoustic pressure curves. Based on the research, the method is proposed to improve transmission loss of air cleaner by placing absorptive material. Applied finite element method, a simplified air cleaner is modeled. The shape likes the rectangular room with smaller sizes. The mode analysis results shown that the modes’ maximum pressure occurs in the corners and the edges in the rectangular air cleaner. For improved the transmission loss, the absorptive material were paced in the corners and edges, it is seen that transmission loss improved greatly in mid and high frequency, and it is better than the method adding filter thickness. Applied this procedure to a real design of air cleaner, the absorptive material was placed in the position where the modes’ maximum pressure gathered. The results testified the procedure is reasonable and feasible; it can be applied in air cleaner design to increase the mid and high frequency of transmission loss of air intake systems.
PU Dayu ZUO zhengxing FENG Huihua LIU Xiao.
Investigation on absorptive material position in air cleaner [J]. Journal of Vibration and Shock, 2009, 28(2): 178-180
