Theoretical analysis and experimental study of hollow acoustic panel

Noise control is important and essential in the electromechanical system; where the industrial health, system maintenance, and operation safety are significantly considered. Therefore, the design expense and the endurance limit of the acoustic hood are mostly focused in the industry. In this study, three types of hollow RC panels are introduced as the acoustic hoods, and the sound absorbing as well as the insulation characteristics are experimentally addressed and compared to the traditional acoustic hood with absorbing wool. The mathematical model and the sound absorption coefficient under various frequencies for the hollow panels are theoretically constructed as the primary criterion. Additionally, a noise source from the real-world electromechanical system is selected and motivated in a designed hollow hood for the experimental research. With the laminar flow of the air in the hollow panel, the sound absorbing and insulation are then manipulated. Moreover; different fillings (air and wool) in the hollow panel are studied and compared for the effectiveness in noise insulation, and the experimental sound power level is introduced into the theoretical modeling of sound absorption. Thus, the sound absorption coefficient of the hollow acoustic panel is furthermore inversely obtained. This paper surely contributes a simple and concrete modeling technique of sound insulation for hollow acoustic panels, as well as provides the comparison for three types of acoustic panels in sound transmission loss and sound insertion loss. The adaptability and applicability of the hollow acoustic panel are found precious to be expanded through this study.