共振吸声体是利用入射声波的频率与自身系统的固有频率一致时,驱动共振吸声体板材在声场中变形共振,从而部分声能转化为热能,引起声能的衰减,达到吸声降噪的目的.这种吸声体在接近共振频率时吸声效果最好.文章首先介绍了共振吸声体的结构及吸声原理,接着对设计出的几种共振吸声体进行了吸声系数的测试;最后将共振吸声体应用到某冰箱的风道噪声实验中,使风道噪声大大降低,从而说明了共振吸声体的降噪功能和效果.%When the frequency of the incident sound wave is near the natural frequency of resonance sound absorber, it drives the board of the body deformation in the sound field because of the resonance, which transforms part of the sound energy into heat energy to weaken the sound energy and then to reduce the noise. The sound absorption effect is at maximum when the frequency of the sound absorber is close to the resonance frequency. In the present study, the structure and the sound absorption principle of the resonance sound absorber were introduced, and then the measurements for the absorption coefficient of the designed resonance sound absorberswere performed. Finally the resonance sound absorber is applied to the the air duct of a refrigerator, and the air duct noise was drastically reduced, which shows the function and effect of the resonance sound absorbing body on noise reduction.
展开▼
