日本国立宇航实验所研究成功一种新的固体发动机探伤方法,称为扫掠频率型超声波探伤方法。使用这种方法不仅可以探测固体发动机的壳体一衬层界面的脱粘,而且可以探测衬层—装药界面的脱粘,这类脱粘是以往的常用超声波探伤法所不能测定的。扫掠频率型超声波探伤法的基本原理是,衬层在一边固定一边自由的边界条件下,其厚 Japan’s National Aerospace Laboratory successfully studied a new solid engine flaw detection method, known as swept frequency ultrasonic flaw detection method. Using this method not only detects the debonding of the shell-liner interface of a solid engine, but also detects the debonding of the liner-charge interface, which can not be measured by conventional ultrasonic flaw detection methods. Swept frequency ultrasonic flaw detection method is based on the basic principle of one side of the liner is fixed free boundary conditions, the thickness