Anechoic Chamber

Anechoic chamber with full vehicle access, used for acoustics and vibration measurements with optional noise flow generator. No gas extraction facilities.

Construction

The Anechoic Chamber is built as a double-shell system. It is acoustically isolated from the rest of the building and from adjacent reverberation chamber by an air gap and is supported on vibration isolation mounts. The inner wall consists of concrete, at least 230 mm thick, the outer wall is a brickwork. The inner room is mounted on VIBREX OMEGA springs. The room has a wire mesh floor. For bringing in larger test objects, including passenger cars, the room can be provided with a removable grid floor.

Wall lining

Walls, ceiling and floor of the Anechoic Chamber are lined with glass-fiber wedges (G+H ASONAD) that provide sound absorption at frequencies above 100 Hz and thus prevent sound reflection from the room boundaries, so that free-field conditions hold.

Dimensions

The effective dimensions between wedges are: L x W x H=6.4 x 5.2 x 5.3 m (176.4 cubic metres)

The acoustically usable 'free field' range measures are: L x W x H=4.7 x 3.5 x 3.6 m (59.2 cubic metres)

Access:

The Anechoic Chamber can be accessed from the Reverberation Chamber through a double wing door, from the outside through a personal emergency door, and through a vehicle access door. The two doors to the outside are built as double door systems.

Reverberation Chamber

Construction

The Reverberation Chamber is the inner shell of a double shell building structure. It is made of concrete.

Dimensions

The clear measures of the room are: L x W x H=11.5 x 7.0 x 6.0 m (483 cubic metres)

The Reverberation Chamber is not empty: all acoustic equipment of the Acoustics and Vibration Research Unit, including furniture, are kept inside.

Access

The Reverberation Chamber can be accessed from the outside through a double door system. At the opposite side the door to the Anechoic Chamber is located.