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    Turn-key noise control solutions for testing

    Anechoic chambers for scientific research

    Acoustic test cells

    Dyno test cells


    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 clients wishes, the Rw insulation

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

    and DIN 52.21001984. Absorption coefficients 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