IAC Acoustics has installed hundreds of hemi-anechoic facilities to universities, research laboratories and test houses. Our range of single and double wall construction rooms allow for high precision measurements to be carried out in a hemi-anechoic environment.
The IAC Acoustics fully anechoic room is designed for the research physicist or engineer who must make precise sound measurements in a free-field acoustic environment. rooms provide high sound transmission loss (TL) characteristics and have a completely anechoic wedge lined interior to meet these requirements.
With advances in room acoustics, test equipment simulation and signal processing, it is possible to conduct noise measurements indoors with a high degree of accuracy. IAC has been at the forefront of providing acoustic testing facilities to the automotive market.
Shake and rattle facilities are typically used at the end of a production line before a vehicle leaves the factory but can also be performed in Hemi-Anechoic Chamber as part of vehicle development. The end of line variant is a final acoustic test to ensure there are no panels which squeak or rattle.
Road traffic noise is a main contributor to environmental noise, thus, it is intended to be reduced and limited by legislation in order to increase health and life quality. Vehicle pass-by noise tests are conducted according to the international standard ISO 362, which quantifies the noise emission of a vehicle in an urban traffic environment, by testing on an outdoor track.
Powertrain testing is typically carried out inside a hemi-anechoic chamber to ensure high acoustic absorbency. A typical layout for powertrain test cells is with 2 or 4 independent dynamometers sitting outside of the test chamber, leaving only the engine and gearbox inside the hemi-anechoic room. IAC powertrain chambers allow functional testing of various powertrain and transmission types in a virtual vehicle environment.
A ventilation system must provide adequate air circulation at sound pressure levels below design criterion. IAC Quiet-vent® silencing systems are designed to provide approximately 15 air changes per hour in a typical anechoic facility.
The last two decades have seen an explosion in acoustic testing by automotive manufacturers, component suppliers, engineering institutions and educational organisations together with a rapid growth in the construction of new acoustic test facilities.