Development of Measuring Method for Acoustic Characteristics by Using 3-microphone : Identification of damping characteristics for perforated panel in the hydraulic fluid

Abstract

An experimental method to analyze the damping characteristics of hydraulic components is proposed in this report. By using our 3-mirophones Method, the absorption coefficient, four terminal constants of the perforated panel in the liquid-filled piping systems were measured. Experiments were conducted on the various perforated panels at high pressure level. Moreover, the sound absorbing characteristics identified are compared with analytical model derived by T. H. Melling. Good agreements achieved suggest that analytical model is reliable enough to predict sound absorbing characteristics for perforated panels.