Standardized Test Methods

The Gesellschaft für Akustikforschung Dresden mbH performs a high number of standardized test methods to measure characteristic values and parameters specific to machines, constructional elements and materials. On the one hand, these are directly requested of our customers. On the other hand, they serve our engineers to design and optimize measures for noise reduction and control.

The essential acoustic properties include e. g.:

• the sound power of machines and devices,
• the sound absorption coefficient and the airflow resistance of sound absorbers and other open-cell materials,
• the airborne sound insulation of separating constructional elements,
• the insertion loss of noise barriers and enclosures as well as
• the transmission loss and the insertion loss of mufflers and silencers.

Relevant vibrational parameters represent e. g.:

• the natural frequencies of machines and constructional elements,
• the bending loss factor of coatings applied for damping structure-borne sound as well as
• the structure-borne sound isolation of vibration isolators.

Thermal quantities that are regularly asked for are e. g.:

• the specific heat capacity of isolating materials in combination with
• the gross density (geometrical density) and the true density (density of sceleton) as well as
• the thermal conductivity of separating constructional elements and isolating materials.

To perform the measurements, besides the required measurement equipment (sensors for airborne and structure-borne sound, multi-channel data acquisition, acoustic measuring devices) and associated analysis software, a wide range of laboratory test benches and special acoustic measurement rooms and test environments are available. Amongst others, these include:

• a reverberation room and a anechoic room (full room, half room, sound measurement cabin),
• test benches for panel-shaped test specimens and components (Window test stand, door test stand, wall test stand, ceiling test stand, chamber test stand),
• test benches for mufflers and silencers (flow test bench with Roots blower, high-temperature test bench with heater and fan) and
• test environments for vibration and thermal testing of material parameters (vibration table, shaker, climatic chamber).