Schermmeting in galmkamer

Product optimization sound absorption

Wout Schwanen: “Sound absorption is an important property of the materials used in the construction industry and in civil engineering. Sound absorbing noise barriers alongside roads and railways protect the surrounding homes from excessive noise. And in offices and schools, sound absorbing wall and ceiling panels are essential for optimal room acoustics. However, different environments require a different approach to acoustic absorption. Together with you, we fully tailor the functionality of your product to the desired sound absorption.”

Impedance tube

During the preliminary stage, various test specimens can be examined quickly and compared by measuring the sound absorption in an impedance tube in accordance with ISO 10534-2. The measurement results can be used as a guideline for further product development to find the optimum combination in  structure and acoustic properties. Based on our broad experience and acoustic knowledge, we can make suggestions for alternative design choices.

Laboratory measurement

The final design can be tested in a reverberation room. For this, we use the Van Dorsser Laboratory in The Hague. We also have the option of having the measurements performed in a laboratory in Planegg at our sister company Müller-BBM. The reverberation room is used to confirm that the acoustic absorption of the product meets the requirements of ISO 354. The results are used to determine the full absorption specifications, including the sound absorption class and various single number designations such as DL, αw and NRC.

In-situ measurement

We can also measure the absorbent properties of your product in an existing situation. We have different measurement methods available for this. For example, we can use the free field method in accordance with ISO 13472-1, or the method to determine the absorption of noise barriers in accordance with the EN 1793-5 standard. These measurements offer several benefits: The measurement can be performed on location and relatively quickly.