TESTING IN SILENCE

Turn-key noise control solutions for testing

▪ Anechoic chambers for scientific research

▪ Acoustic test cells

▪ Dyno test cells

TESTING IN SILENCE

Testing in silence is important for people and the environment, and to be able to perform reliable sound measurements. Merford Noise Control supplies customised acoustic test cells, dyno test cells and anechoic chambers. We take care of the entire process in-house, from design and engineering to production and assembly. We reduce sound to an acceptable level, also taking into account requirements and wishes in the field of ventilation, access, maintenance and (fire) safety. In addition, we provide firm guarantees for sound insulation, giving you absolute assurance the solution satisfies your requirements.

OPTIMUM SOUND REDUCTIONOur acoustic test rooms ensure that a noisy source within the

room is reduced to a low sound level outside, or vice versa. In

the latter case sound coming from outside is reduced, creating

an acceptable sound level inside the room. Our solutions are

built up around robust, self-supporting panels as a modular

system, either with or without components such as doors,

windows, silencers or ducting. This allows for easy disassembly

and re-assembly on a different location.

Optimum sound reduction can be achieved with many dif-

ferent combinations. Single-wall systems are available, but

also box-in-box systems for very high sound reduction require-

ments. Depending on the client’s wishes, the Rw insulation

values vary between 34 dB and 52 dB according to ISO717-1982

and DIN 52.21001984. Absorption coefficients α may vary

between 0.75 and 1.00 according to ISO/FDIS 11654:1996.

COMBINATION OF ACOUSTICS AND SILENT VENTILATIONPractically all Merford solutions are fitted with a ventilation

system to remove the heat generated inside and to supply air

from the outside. We determine the required ventilation flow

based on your wishes and the application concerned, depend-

ing on, for example, the heat radiated by the test object. The

ventilation system is fitted with heavy-duty acoustic silencers

on both the air supply and exhaust, to achieve at least the same

insulation values as the acoustic values used. Our splitters

have a very favourable design for air flow, creating a low back

pressure. This results in a huge reduction in the energy required

for the ventilation system. The splitters in the silencers are

highly robust and can be cleaned. We use energy-efficient,

adjustable fans with state-of-the-art technology.

We can also install ducting, roof ducts and rain hoods. For

optimum ventilation flow in the right location we can add

diffusers, valves and ducting to the solution. If required, the

acoustic ventilation system can be used for air-resistance

simulations at high velocities, with flows of 200,000 m3/h

and above.

SILENT CONTROL ROOM / OPERATOR ROOMFor your staff, a safe and comfortable work environment is

of great importance. A Merford control room or operator

room protects your engineers from noise and other pos-

sible hazardous effects (heat, exhaust gases, etc.) during

testing. A pleasant sound level makes it easier for them to

concentrate and therefore increases productivity. The acoustic

environment in the control room and the desired finishing

can be selected in accordance with your requirements. Every

control room is fitted with sufficient shatterproof glass and

ventilation. Cable and pipe ducts are acoustically sealed in a

professional manner.

ANECHOIC CHAMBERS AND SILENT ROOMSIn anechoic chambers and silent rooms, reflections must be

minimised for acoustic measurements in anechoic rooms.

The cut-off frequency in the room and the dimensions deter-

mine the choice of sound-absorbing material. This may vary

from flat sound-absorbing material to cone-shaped material.

Existing structural rooms can also be converted. Apart from

the need to achieve a high sound-insulation value, one im-

portant issue is reducing impact noise via the foundations

and building structures.

Merford Noise ControlPO Box 160, 4200 AD GorinchemFranklinweg 8, 4207 HZ GorinchemThe Netherlands

tel +31 (0)183 675 000noisecontrol@merford.comwww.merford.com