Adhesive Structure Acoustic Parameters Measurement and Analysis of SRM Based on Ultrasonic Wave

The multilayer adhesive structure of solid rocket motors (SRM) is studied in this paper. The ultrasonic pulse-echo measuring method was described to measuring multilayer adhesive structure acoustic parameters. The sound velocity of the thermal barrier and cladding layer was measured. The acoustic impedance and acoustic attenuation coefficient was gained by theoretical calculation. A method of equivalent thermal barrier was proposed to analyzing the transmission coefficient and the reflection coefficient. The experimental results indicate that the method of equivalent thermal barrier can simplify the SRM theoretical model of multilayer adhesive structure, and thus it can effectively provide a good help for SRM structure acoustic research.