压缩机噪声的跟踪采样近场声全息实验研究  

Acoustic field test of a rolling-piston compressor using nearfield acoustic holography combined with track-sampling

作　　者：张海滨[1] 蒋伟康[1] 万泉[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海200240

出　　处：《振动与冲击》2010年第11期51-54,65,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(10674096);国家高技术研究发展计划(863)(2007AA04Z416);中国博士后基金(批准号:No20100470705)

摘　　要：降低噪声水平是提高产品质量的一个重要指标,识别噪声和振动源有助于采取针对性措施改进设计,从而达到减振降噪的目的。近场声全息技术的三维可视化功能可以有效地重建声振场,识别噪声源的主要位置。针对工业中广泛使用的旋转机械,提出用跟踪采样技术结合近场声全息方法进行声场分析,可以获取不同旋转区间的声场信息。以小型旋转式活塞压缩机为研究对象,压缩机由压缩机主体和储液器两个主要部分组成。利用Mller-BBM测试系统对压缩机外部声场进行测量,同时跟踪记录压缩机叶片的运动过程,在信号预处理后获取压缩机不同工作阶段的声信号,然后通过近场声全息技术重建了不同工作阶段压缩机表面的声场。重建的结果反映了声源的主要位置和不同工作阶段的变化情况,为近场声全息技术分析旋转机械声源方面提供了参考。A rolling piston compressor is used widely in industry and household electric appliances.Lowering the level of noise and vibration is becoming a critical target for product designing.Here,the noise and vibration characteristics of a rolling piston compressor was analyzed by using wave superposition combined with the track sampling method.The signals were measured through scanning using Mller-BBM system,including 23 channels of pressure signals and one channel of displacement signal of the compressor vane reflecting the rolling phase.The pressure signals were analyzed piecewisely in the whole 360 degrees and the results were used to reconstruct the vibro-acoustic field.The reconstruction showed the vibration and sound information in the different segments.This study offered a new way to analyze the sound sources running circularly.

关 键 词：声全息 跟踪采样 声振场 

分 类 号：TB525[理学—物理] TB95[理学—声学]