摘要
研究利用阵列信号处理技术实现冲击定位的新方法,通过小波变换提取冲击响应信号某一窄带频率成分,运用传播算子法实现冲击源波达方向估计;根据Lamb波传播特性,用小波变换求出某一中心频率下的对称模式和反对称模式的Lamb波到达同一传感器的时间差,结合对称模式和反对称模式Lamb的速度差就可以估计出冲击源到达传感器的距离,从而实现冲击定位。在航空油箱上的实验表明:该方法能快速、精确地识别出冲击源的位置。
A new method for impact localization is introduced based on array signal processing technology. A narrowband frequency component of response signal is extracted by using wavelet transform, direction-of-arrival （DOA） is estimated based on propagator method. Based on propagation characteristics of Lamb wave, time-delay between symmetry modal wave and antisymmetry modal wave of one central frequency lamb wave arriving to the same array element is gained by using wavelet transform, distance between impact source and sensor is estimated according to velocity difference between symmetry modal wave and antisymmetry modal wave, so impact localization is realized, The proposed technique is applied to aeronautical tank, the result shows that the proposed method may identify impact location fast and accurately.
出处
《传感器与微系统》
CSCD
北大核心
2010年第4期22-25,共4页
Transducer and Microsystem Technologies
关键词
阵列信号处理
传播算子方法
波达方向估计
小波变换
冲击定位
array signal processing
propagator method
direction-of-arrival estimation
wavelet transform
impact localization
