Question

What is absorption coefficent of a material? Obtain the relation between absorption
coefficient and time of reverberation.​

Answer 1

Answer:

SAC measured by the Alpha cabin is calculated from the measurement of the reverberation time with and without the test sample using Sabine’s empirical formula given below:(11.7)Sα=λ×55.3×Vc×(1T2−1T1)where λ is correction factor, c is the speed of sound (m/s), V is the volume of the cabin, S is the surface area, α is the SAC, T2 is the reverberation time with sample, and T1 is the reverberation time without sample.

From: Automotive Tire Noise and Vibrations, 2020