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Patrick Bouché, B. ing., Ph.D., Expert en simulations vibroacoustiques et en conception de métamatériaux chez Mecanum présentera une étude sur l’optimisation du comportement basse fréquence d’une cabine d’essai acoustique.

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A small reverberant room can be an efficient and economic tool to provide fast diffuse-field sound absorption measurements of homogeneous sound absorbers or more complex structures, and useful for developing, testing, or evaluating specification requirements in many industrial fields. However, small reverberant rooms are known to have some diffusivity issues in lower and middle frequencies, leading to unsuitable levels of consistency, reliability, and repeatability. This paper presents the results of a study made to improve the measurement performance of a 5.7‑m³ reverberant room under its Schroeder frequency (around 1275 Hz) by adding hanging diffusers.

Champ diffus dans la cabine acoustique Mecanum

Using Ray-Tracing method, a numerical parametric study was done to estimate sound absorption of various samples by varying the number, the position, and the orientation of these diffusers based on ASTM C423 and E795 standards. Moreover, extra simulation has been performed to evaluate the effect of sample size on sound absorption consistency in function of frequency. Following these prescriptions, an experimental study was done to confirm these improvements on frequency-dependent sound absorption and single rating numbers such as NRC (Noise Reduction Coefficient) and SAA (Sound Absorption Average). The results show that for this room, low-frequency performance is significantly increased by using 4 well‑placed hanging diffusers and a sufficient sample size.

Cabine acoustique de test Mecanum

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