基于逆滤波器原理的吸声系数测量研究  

Research on Measurement of Sound Absorbtion Coefficient Based on Inverse Filter Principle

作　　者：孙亮[1] 万芳荣[1] 董利英[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《噪声与振动控制》2009年第2期140-142,共3页Noise and Vibration Control

基　　金：国家自然科学基金资助项目(10674111);西北工业大学研究生种子基金资助(200709)

摘　　要：水声材料的发展越来越朝着低频、宽带方向发展。因此,对于它的吸声系数的测量便显得越来越重要。脉冲法可用于常见水声吸声材料的测量,是一种比较精确的方法,而这依赖于具有良好波形的脉冲的产生。提出利用逆滤波器原理来产生宽带水声脉冲,克服系统瞬态响应的影响,而且可以通过设计脉冲波形,更有针对性地测量水声材料在宽频以及特定频段处的吸声系数,方法简单可靠。With the growth of application of underwater sound materials of low-frequency and broad bandwidth, precise measurement of sound absorption coefficient becomes more and more important. Fortunately, impulse measurement method can be utilized to measure it accurately. However, precision of this method depends on the generation of well-shaped impulse. In this paper, it is proposed that the broad-band underwater impulse can be obtained using inverse filter principle, which can reduce the influence of transient response of the transducer system. With this method, the absorption coefficient of the underwater sound material can be measured in a broad frequency band or in the prescribed range by means of the design of waveform. Furthermore, this method is relatively simple and frequency reliable

关 键 词：声学 butterworth脉冲 衰减正弦脉冲 宽带 

分 类 号：TU112.22[建筑科学—建筑理论]