双声源法测量有源多层板声学性能的实验研究  

Acoustical performance of double-wall active sound packages based on two source-location method

作　　者：胡莹[1] 陈克安[1] Galland Marie-Annick 

机构地区：[1]西北工业大学航海学院环境工程系,陕西西安710072 [2]里昂中央理工大学声学实验室,法国里昂69134

出　　处：《振动工程学报》2010年第4期450-456,共7页Journal of Vibration Engineering

基　　金：法国PARABAS国家项目资助(ANR-06-BLAN-0081-01)

摘　　要：采用双声源法对有源多层板声学结构的声学性能进行了测量,以压电陶瓷片作用在被激励板上使之振动产生次级声源,验证了以往研究中的一系列理论。实验研究结果表明:多孔材料可以实现多层板有源声学结构在高频范围的吸声;以最小声压为目标函数,利用FxLMS算法获得最优次级声源强度进行有源控制,可以提高结构在共振频率上的隔声量;为保证隔声量测量误差不超过5 dB,必须选择测量幅度误差小于±0.5 dB的传声器,且传声器间距必须满足一定的数学条件;传声器精度一定时,传声器间距为测试频率1/4波长的整数倍,隔声量测量误差达到最小值。A two source-location method is developed to measure the transmission loss of double-wall active sound packages with piezoelectric ceramics bonded to the excited plate. The results show that （1） Porous materials achieve passively sound- absorbing in the double-wall active sound packages in high frequencies; （2） The optimal secondary source is obtained by using FxLMS algorithm under the minimization of the sound pressure, and the transmission loss of the double-wall active sound packages can be improved in resonance frequencies; （3） To ensure that the measurement error of the transmission loss is less than 5dB, the microphones must be chosen with the precision within q-0.5dB, and the distance between them need satisfy some mathematical conditions; （4） When the precision of the microphones is confirmed, the measurement error of the trans- mission loss is up to the minimum with the distance between the microphones equal to 1/4 wavelength of the interested frequency.

关 键 词：隔声量 有源声学结构 压电陶瓷 双声源法 误差分析 

分 类 号：TB52[理学—物理]