Airborne and impact sound insulation

Airborne and impact sound insulation

Airborne sound insulation

The sound insulation measure R describes the reduction in sound transmission through a structural element such as walls, windows, and doors when excited by airborne sound. The improvement of airborne sound insulation ΔR is describes by the increase in the sound insulation measure R of a basic structural element due to a structure being fitted in front of it, such as a facing panel or a double floor.

The airborne sound insulation of smaller structural elements, such as overflow elements or roller shutter casings, is denoted with the normalised sound level difference of the component Dn, e.

Impact sound insulation

The standardised impact sound level is the sound pressure level in a room upon excitation of the ceiling with a standard structure-borne sound source (a so-called standardised forge). The reduction in the impact sound level, ΔL, describes the improvement of impact sound insulation due to a floor covering, such as carpeting or a floating screed.

Flanking sound insulation

Flanking sound transmission occurs when the transmission of sound is not directly through a structural element, but through the flanking elements of a separating element. The normalised flank sound level difference, Dn, f is determined with airborne sound stimulation and the normalised flank impact sound Ln, f is determined with impact noise excitation.

What we offer

Depending on the application and transmission path, we use the following methods for determining airborne and impact sound insulation.

Measured value/
Derived values
Testing standard/Evaluation Testing facility

 

Sound reduction index R or Rw

Single value specificaiton for noise barriers DLR

Sound Transmission Loss STL

Sound Transmission Class STC

ISO 10140-2

ISO 717-1

EN 1793-2

ASTM E90

ASTM E413

Wall test bench

Window/Door test bench

Examples: Solid walls, drywalls, roofs, facades, noise protection walls, doors, gates
Improvement of airborne sound insulations ΔR or ΔRw

ISO 10140-2

ISO 717-1

Wall test bench

Ceiling Test bench

Examples: Hollow floors, double floors, facings
Normalised sound level difference of the component Dn, e
 or Dn, e, w

ISO 10140-2

ISO 717-1

Wall test bench

Window/Door test bench

Examples: overflow elements, facade ventilation units
Normalised flank sound level difference Dn, f
or Dn, f, w

ISO 10848-2

ISO 717-1

Wall test bench
Examples: Hollow floors, double floors , false ceilings, facades
Normalised flank impact sound level Ln, f or Ln, f, w

ISO 10848-2

ISO 717-1

Wall test bench
Examples: Hollow floors, double floors
Impact sound reduction ΔL or ΔLw

ISO 10140-2

ISO 717-1

Ceiling Test bench
Examples: hollow floors, double floors, floating screeds, carpeted floors, sports floors

 

Transmission factor t

Sound reduction index in the event of perpendicular incident sound R(0)

ISO 10534-2Impedance tube
Examples: Materials or structural components, e.g. for vehicle manufacturing

For special measurements, such as the selective determination of sound insulation of sections of a test specimen or the test of very high sound insulation levels, we have access to intensity measurement technology in accordance with ISO 15186. With the help of a robot-driven intensity sensor, we can scan the acoustic emission of the surface of the structural element on the reception room side in a random measuring grid and make the areas of increased acoustic emission visible.

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