The sound transmission losses across coupled cavities in close proximity were studied experimentally in the present investigation. Each coupled cavity was made by two shadow side branch cavities mounted on opposite walls of a rectangular duct offset by a distance d. The velocity of
flow inside the duct was varied from 0 to 20 m/s. Pressure transducers were used to record the pressure fields within the cavities region. A series of pressure measurements were carried out simultaneously with the sound transmission loss measurement to better understand the sound field within
the coupled cavities region. A new method of signal correlation was carried out to reduce the impact of flow turbulence on the pressure transducer signals. The results show that the increase of d can result in stronger sound transmission loss in the absence of the duct flow. Low sound pressure
region can be observed in the central part of the duct region. The sound transmission loss level was reduced when a low Mach number flow was presented in a duct. The size of the corresponding low pressure region became smaller as flow velocity increases.
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