Research on acoustic emission attenuation characteristics and experiments on composite cylinders

Abstract

The object of our research is the 50L carbon fiber composite cylinder. Using the acoustic attenuation theory formula of a fixed emission frequency and a non-fixed emission frequency, we calculated the acoustic attenuation coefficients of the composite cylinder. We obtained the theoretical attenuation laws of acoustic waves on the composite cylinder in the longitudinal direction. The research results show that the relative errors between theory and experiment of the fixed emission frequency and the non-fixed emission frequency are 1.80 and 3.33%, respectively, but the attenuation of a fixed emission frequency is faster than that of a non-fixed emission frequency, waves of the fixed emission frequency spread closer. Both can provide the basis for a sensor layout scheme and the acoustic source judgment of composite cylinder state detection.