Measurement of acoustic resistance of perforated plates subjected to a pulsated grazing flow
Linear and non-linear properties of perforations have been studied extensively. High porosity macro-perforations are normally considered linear, while many of these experiments were limited to noise levels below 160 dB. To reproduce more representative conditions met in some internal combustion engine exhaust systems, a new electro-pneumatic source was built and used. The new test bench is capable of generating single-pulse up to 180 dB with a low harmonic distortion under stationary grazing flow with Mach number up to 0.3.
A two-load method based on the transfer matrix method is used in the experiment. From the measured transfer matrix, the transmission loss can be determined and the transfer impedance can be further extracted using an indirect method. The presented test bench is shown to be a practical tool to investigate how extremely high amplitude single-frequency acoustic excitation affects the transfer impedance of perforated panels using in various industrial applications.
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