发动机绝热层粘接质量超声自动检测系统设计

Design of Automatic Ultrasonic Detection System for Insulating Layer Debonding Flaws of SRM

针对壳体椭圆度较大且内壁采用喷砂处理的某型大口径固体火箭发动机壳体/绝热层界面粘接质量检测问题,采用水浸式脉冲回波超声检测方法作为检测手段,设计了具有两自由度支撑结构的粘接质量自动检测系统。通过对试件进行螺旋C扫描,获得了发动机粘接质量图像。基于对检测图像噪声的分析,采用中值滤波法提高了扫描图的信噪比。对有制作人工缺陷的发动机自动检测的结果表明,系统较为准确地计算出人工缺陷的位置及面积,其检测分辨率达到了Ф3mm。

To solve the detection problem of debonding flaws between the motor case and the insulating layer for a large-caliber SRM with large ellipticity and inner-shell sandblasting,an automatic bond quality detection system based on ultrasonic pulse echo method using a focusing probe is designed.A 2-DOF structure is used in consideration of the system＇s universality.The SNR of the motor bond quality diagnostic image obtained from the spiral scan of the whole motor is improved by median filtering according to features of the noise.The auto-detection results indicate that the system has calculated the locations and dimensions of artificial flaws relatively accurately,and the detection resolution reaches Φ3 mm.