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Acoustic test facilities

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Anechoic Rooms

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Wedge Type Lining

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Absorption Resonance System

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Acoustic And Multi-purpose Test Rooms

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Reverberation Chambers, Transmission loss Lab, Listening  rooms, Studios

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Our partners: T&S Technologies

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Aeroacoustic Windtunnels

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Climatic Wind tunnels

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Instrumentation for Noise and    Vibration

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Dynamic Balancing/Testing   Systems

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Services - Consultancy

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ACOUSTIC TEST FACILITIES >> ANECHOIC ROOMS

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Anechoic rooms, such as hemi-anechoic rooms, or fully anechoic rooms are created to simulate what is called a free field. A free field is the representation of a theoretical infinite space, in which no sound wave reflections, or echoes, take place. The boundaries of anechoic rooms are lined with sound absorbent material in order to achieve free-field conditions.

Compliance with free-field condition makes high demands on the acoustic lining: it must yield absorption coefficients of more than 99% above a certain lower cut-off frequency.

Anechoic test rooms require thorough and comprehensive planning which is well coordinated with the utilisation of the room. Unfortunately, in the field of acoustic test facilities even early in the planning process mistakes are made over and over again that can prove costly later. Inadequate room dimensions may lead to a restricted usability or a wrong choice of acoustic lining to a poor performance of an expensive R&D facility.

For example, measurements such as vehicle interior noise levels or acoustic near-field measurements can be conducted in rooms applying a space-saving compact lining system such as the combined absorption-resonance-system whereas free-field measurements, e.g. vehicle pass-by noise tests, engine & exhaust pipe measurements and narrow-band analysis in general require a more precise room using a sound absorbent cube- or wedge-type lining system.

The future of anechoic test facilities lies in tailor-made solutions that exactly meet the clients’ individual needs. We have the sound experience of many years and provides the full range of acoustic test facilities for ambitious research & development purposes. Our products include a variety of all common absorber types and absorbent material:

Porous absorbers: wedge or cube type systems.

Combined absorption-resonance system

Both systems can be designed with mineral fibre absorbers or technical foam.

In addition we offer complete equipment for acoustic test rooms, e.g.

Vibration isolated mounting of the inner room of a double walled construction (box-in-box construction)

Room air-conditioning with low ambient noise levels.

Heating/cooling chambers for combined acoustic and material testing.

Complete vehicle cooling system with headwind blowers.

Spot coolers and exhaust gas extraction systems.

Sound retardant and fire resistant doors, gates and windows.

Non reflecting and noiseless lightening system.

Sound insulating cable sleeves.

Based on our strong experience, we support our clients from the feasibility stage, through design and development, and into the test room operation and management. The results are high-quality and accurate test facilities, delivered on time and budget.

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