火箭发动机包覆层测厚时间延迟估计算法研究  

Time Delay Estimation Research for Rocket Motor Cladding Thickness Measurement

作　　者：刘祥景[1] 路宏年[1] 张吉堂[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：《无损检测》2007年第9期526-528,共3页Nondestructive Testing

摘　　要：用超声测量火箭发动机包覆层厚度时,当包覆层较薄时检测回波信号会出现时域混叠。为此提出一种时间延迟估计的新方法。该方法能对修正的检测信号能量谱的对数微商求逆傅里叶变换。实验结果表明,该方法能准确估计出时域混叠信号的延迟时间。提高了火箭发动机包覆层厚度测量精度。When measuring the cladding thickness of rocket motor by ultrasonic means, the obtained echoes of the thin cladding will overlap in the time field. Based on the characteristics of overlapped echoes, a new method for time delay estimation was presented. The method consisted in taking the envelope of the inverse Fourier transform of a corrected measured signal. Experimental results showed the method could estimate the delay time of the overlapped signals accurately. It improved the measuring precision of the ...

关 键 词：超声波测厚 火箭发动机包覆层 时间延迟估计 对数微商 信号处理 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]