一种声发射信号方位角自适应监测算法  

Adaptive azimuth angle monitoring algorithm for acoustic emission signals

作　　者：沈怡平[1] 赵洪亮[1] 滕升华[1] 于筱光 宋振[1] 

机构地区：[1]山东科技大学信息与电气工程学院,青岛266590

出　　处：《应用声学》2014年第1期66-71,共6页Journal of Applied Acoustics

基　　金：山东省科技发展计划项目(2010GSF10809)

摘　　要：四阶累积量可用于声发射信号处理,结合盲波束形成算法可对声发射信号的方位角进行估计。由于四阶累积量的计算量较大,采用迭代计算的思想,提出一种基于四阶累积量的自适应声发射信号方位角监测算法。与改进前的算法相比,自适应算法的计算复杂度和所需存贮空间均显著降低,可用于声发射信号的方位估计和监测。计算机仿真及实测数据分析均验证了算法的有效性。Acoustic emission signals can be processed by fourth-order cumulant, and combined with blind beamforming algorithm, fourth-order cumulant can be used in azimuth angle estimation for acoustic emission signals. Because of the high computational complexity of fourth-order cumulant, using the idea of iterative computing, a fourth-order cumulant based adaptive azimuth angle monitoring algorithm for acoustic emission signals was proposed. Compared with the original algorithm, this new adaptive algorithm can reduce the com- putational complexity and storage space significantly, and can be used in azimuth angle estimation and monitoring for acoustic emission signals. Finally the computer simulation and analysis of actual data demonstrated the validity of the new algorithm.

关 键 词：声发射 四阶累积量 自适应 方位角估计 

分 类 号：TN911.7[电子电信—通信与信息系统]