Sound Attenuation Devices for Dogs Barking (Estimation of Aperture Ratio and Experimental Study of Silencer)

Abstract

This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss.Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. First, we estimated aperture ratio of the silencer device which was considered by physiological sustainability of dog. Next, we attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

Study of arrayed side branch silencer for ventilation door (Theoretical analysis and measurement of transmission loss)

“…There have been studies on silencers that apply large aperture ratios, such as louvers with silencing functions (Sakamoto, et al, 2014a), (Yamaguchi, et al, 2010), (Matsumoto, et al, 2011) and silencers for dog cages (Sakamoto, et al, 2014b). …”