管道噪声有源控制的声学特性研究Ⅱ实验部分  

Study on Acoustic Character of Active Noise Attenuation in Ducts Ⅱ Experiment

作　　者：吴斌[1] 费仁元[2] 周大森[1] 

机构地区：[1]北京工业大学环境与能源工程学院,北京100022 [2]北京工业大学机械工程与应用电子技术学院,北京100022

出　　处：《北京工业大学学报》2004年第1期31-34,共4页Journal of Beijing University of Technology

基　　金：北京市自然科学基金资助项目(3002004);北京工业大学博士科研启动基金资助项目(0505200361).

摘　　要：为验证在噪声有源控制系统作用下管道初级源与次级源之间驻波场的声场特性,在所设计的自适应有源消声实验系统上进行了低频段的单频消声实验,当各频率点分别取得了最大的消声效果后,采用驻波分离法对噪声有源控制系统作用下管道的声学特性进行了测试分析.实验结果验证:当达到最大消声效果时,在初级源与次级源之间驻波场声反射系数的模接近于1,从管道上游传播过来的声能量大部分被反射回去.In order to verify the acoustic character of the standing wave field between the noise source and the secondary source in ducts under the control of the active noise attenuation system, the authors made the single frequency noise cancellation experiment in low frequency bands on the adaptive active noise control experimental system designed by their own. After achieving the maximum noise cancellation result at each frequency point, the duct acoustic characters under the control of the active noise attenuation system are measured and analyzed by the standing wave separation method. The experimental results show that the reflection coefficient's module of standing wave field between the noise source and the secondary source is close to 1 while reaching the maximum noise cancellation effect, i.e., most of sound energy transmitted from the advanced of ducts is reflected back.

关 键 词：有源消声 驻波分离法 自适应控制 驻波场 

分 类 号：TB535[理学—物理]