The achecoic chamber is encloses the test section of our aeroacoustic wind tunnel and has dimensions 6 × 6 × 4 m. The target anechoic chamber cut-off frequency of 160 Hz is obtained through a combination of materials and construction techniques. The wind tunnel test section can be removed from the anechoic chamber and covered so that a fully anechoic environment is ensured.
In 2018, we refurbished the anechoic chamber in its current form. In the new configuration, wedge type absorbers covering approximately 80% of the anechoic chamber walls replaced the flat absorbers. Thick flat absorbers of 350 mm and 550 mm cover the other 20% of the anechoic chamber. The choice for wedges was made to improve the anechoic chamber capacity to absorb tonal noise components. The flat absorbers are placed in the regions subject to high wind speed where mineral wool wedges could not sufficiently resist the aerodynamic load. TThe design choices considered the optimization of the acoustic performance and constraints related to the site, i.e. maximum occupied area, safety, health and fire hazard. The anechoic chamber walls are lined with the commercial wedges ASONAD-MF composed of mineral wool covered by an acoustically transparent fiberglass cloth with double tips. The anechoic chamber was qualified following the International Standard ISO 3745:2012 Annex A, “General procedures for qualification of anechoic and semi-anechoic rooms”.
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