摘要
基于封闭空间有源消声的基本理论,利用COMSOL软件对封闭空间声场进行了仿真建模,并模拟分析了次级声源的数量和位置关系对消声效果的影响。结果表明:次级声源布置在初级声源半波长奇数倍的空间点位时消声明显。单次级声源靠近声场中部布置时,对全声场区域消声明显;双次级声源和三次级声源布置时,使各次源保持适当距离且靠近目标区域,消声效果比较明显,区域声压级可降至60dB甚至以下。
Based on the basic theory of ANC within the enclosed space,this paper models the enclosed space with the COMSOL software,and presents the simulation and analysis effects of noise reduction which is derived from the numbers and location of the secondary noise resources.The results show that： It has a evident noise reduction when the secondary noise resources located at the space spots which are odd times of half-wavelength away from the primary noise resource.When Single secondary noise resource is closer to the target sound field, the whole sound field has a evident noise reduction; when double and treble secondary noise close to the target area, the nois resources are located, every resource maintains an appropriate distance e reduction is evident and the sound pressure level can be reduced to 60dB or much lower.
出处
《沈阳航空工业学院学报》
2009年第5期63-67,共5页
Journal of Shenyang Institute of Aeronautical Engineering
关键词
封闭空间
次级声源
消减
enclosed space
secondary noise source
reduction
