Sound absorbers

© Fraunhofer IBP

Components and materials capable of absorbing sound

In order to plan and design room acoustics successfully, special sound-absorbing components and materials are needed. Our specialists not only develop these materials and components for a wide range of rooms with different uses but also take into account the specific requirements of surfaces and materials.

These can include specifications regarding design, hygiene, fire protection, haptics, durability, or system integration. Other acoustic properties, such as a special type of sound insulation or low sound radiation, may also need to be considered and optimized. In addition, we develop multi-functional components (acoustics, thermal insulation, heating and cooling, etc.), transparent and translucent absorbers, partition walls, noise barriers and absorbers made of natural fibers, such as hemp or flax.

The focus in material development is on material properties and the acoustic features they need to achieve optimum sound absorption with a certain thickness. Other requirements, such as sufficient compressive strength, are also taken into account. The manufacturing process and exploiting the possibilities offered by it are also highly important. For this reason, we are always in close contact with our customers when we work on new developments.

When developing materials, we use specially-designed models and diverse absorption algorithms to calculate absorbers with a multi-layer structure for porous absorbers, various resonators, and microperforated absorbers. These are can all be further developed if necessary. We also implement a range of simulation options, such as modeling with Matlab, Python Comsol, and GeoDict.

Input data can be determined either by direct measurement or indirectly by measurement in a specially-developed impedance tube, an air pycnometer, and by evaluating images generated by computer tomography. Our most successful work includes the development of acoustic plasters, mineral foams, and granular materials.