摘要
分别从理论和试验两个方面,对非适应和自适应两种管道有源消声系统中的次级声源安装角度对系统性能的影响进行了研究。结果表明,采用自适应结构具有明显的优越性。小的次级声源安装角度,可以优化有源消声系统的声波干涉条件,提高系统消声量,加快自适应有源消声系统收敛速度,并适当降低系统对次级声源的功率要求。对宽带有源消声系统而言,可以提高次级声源的指向性,减小系统存在的'声反馈'现象,提高控制系统的工作稳定性。最后,提出了几项实际工程设计原则。
Arrangement-angle of the secondary source on the performance of non-adaptive ANC (Active noise control) and AANC (Adaptive active noise control) systems in ducts are analyzed and tested in detail from theoretical and experimental aspects respectively. The results verified that the AANC method has great advantages, and the inclination angle between the main duct and the side-branch duct incorporated the secondary source can optimize the interfere condition between the primary noise wave and the secondary noise wave. A smaller arrangement-angle results in much more amount noise attenuation, a sooner convergence time of the AANC system, and a lower power requirement of the secondary source. For a broadband AANC system, a smaller arrangement-angle can improve the directional radiation ability of the secondary source, and reduce the acoustic feedback from the secondary source to the input microphone, and this will greatly improve the stability of the control system. Finally, several proposals for engineering design of the secondary source arrangement are presented.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2005年第4期63-68,共6页
Journal of Mechanical Engineering
基金
北京市自然科学基金资助项目(3002004)
