火箭发动机包覆层测厚的超声信号处理研究  

Ultrasonic Signal Processing Investigation in the Cladding Thickness Measurement of Rocket Motor

作　　者：罗婕[1] 路宏年[1] 

机构地区：[1]北京航空航天大学机械工程及自动化学院,北京100083

出　　处：《压电与声光》2007年第4期471-474,共4页Piezoelectrics & Acoustooptics

摘　　要：在用超声波对固体火箭发动机双包覆层的厚度进行测量时,若包覆层较薄,超声回波信号会产生严重混叠,给各回波间的时延估计带来困难。基于超声信号的传播模型,在利用维纳滤波解卷积技术消除第一回波和噪声的影响后,采用维纳滤波解卷积技术和改进的前后向线性预测滤波器技术(MFBLP)从混叠信号中得到了高分辨率的时延估值。模拟信号和实验信号证明,该方对噪声不敏感,并对混叠信号的时延估计有很好的效果,从而提高了火箭发动机薄包覆层的厚度测量精度。In the ultrasonic thickness measurement of double cladding layers of solid propellant rocket motor, if the cladding layers are quite thin, serious aliasing appears in the ultrasonic echo signals, which makes time delay estimation difficult. Based on the ultrasonic signal transmission model in this paper, after the effects of first echo signal and noise being eliminated by wiener filter deconvolution technique, time delay values of high revolution were obtained from aliasing signals using MFBLP. It was validated by analog and experiment signals that this method works well in the time delay estimation of aliasing signals and has low sensitivity to noise. And it improves the thickness measurement precision for thin cladding layers of rocket motor.

关 键 词：MFBLP 包覆层 超声回波信号 多径时延估计 维纳滤波 

分 类 号：TG115[金属学及工艺—物理冶金]