DESIGN, MANUFACTURING AND VALIDATION OF A TEST FACILITY FOR TRANSMISSION LOSS MEASUREMENT
G. Carducci, C. Casale, P. Russo, F. Marulo
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Traditional methods of measuring Sound Transmission Loss (SIL) of acoustic materials and treaiments are lime-consuming and expensive. To overcome this limitation, normal incidence Transmission Loss measurement technique using an impedance tube has been developed. This paper presents an effort made to design and build a cost-effective impedance tube as per the ASTM E2611 – 09. Standardized measurement uses a plane wave tube instrumented with four microphones and a termination consisting of an adaptable acoustic load. The mathematical formulation is based on the transfer Matrix representation (IM method). In order to validate the proposed model design, a numerical, experimental and theoretical correlation is presented. The numerical model is obtained using the Finite Element Method (FEM).
Therefore, the lest jacity operation has proved reliable.
Sound Transmission Loss, 4-microphones impedance tube, Transfer Matrix method, finite element method.
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