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Sound absorption coefficient tests

On October 9, 2015, DeDe Furniture signed a contract with the Faculty of Materials Engineering and Robotics, Department of Mechanics and Vibroacoustics at the AGH University of Science and Technology for the "Development of a concept and preparation for the production of a new product in the form of a decorative acoustic panel system". One of the requirements of the contract was to test the sound absorption coefficient of a decorative acoustic panel system. The test, which was carried out in accordance with the guidelines included in the PN-ISO 10534-2:2003 standard, included three samples of materials. Specifically, it was chipboard, beech glulam and MDF board.

The examination of the individual three samples in the impedance tube gave very similar results, but due to the aesthetic value of the wood and the best possibilities of further processing, a sample made of beech glulam was selected. In the next study, the energy dissipation coefficient of a system of decorative acoustic panels was checked. The results of these studies, which were visualized in the form of graphs and tables, indicate that the absorption coefficient of panels in the frequency range from 2000 to 10000 Hz is very good.

Subsequently, as part of further research, a 24 m2 panel system was installed in the office room, which made it possible to measure these coefficients under non-laboratory conditions. The tested coefficients could also be improved thanks to the panel assembly system designed for testing.

Using prototyping methods, a sample of real dimensions was created on which tests were carried out to confirm all the assumptions. Already at the stage of designing and consulting works in the Department of Mechanics and Vibroacoustics at the AGH University of Science and Technology, a hybrid acoustic system with a 3D structure, made of wood, was created. This is a combination of absorber and diffuser.

As a result, the sound absorption coefficient has risen, but scattering properties have also been introduced. This is extremely important in relation to the parameters contained in the Polish Standard PN-B 02151-4:2015-06, whose requirements relate to reverberation time, acoustic absorption and speech transmission rate. In order for these parameters to be maintained, the physical characteristics obtained in our panels are important.

Acoustic absorption is expressed by the formula A= aśrS, in which aśr is the average sound absorption coefficient, and S is the area of planes that limit the area of the room. This also applies to the floor in square metres. The panels created by us have a high absorption coefficient of aver, thanks to which parameter A reaches a higher level. The same is true for the reverberation time, which is calculated using the acoustic absorption and average sound absorption coefficient.

By using such a system in rooms with large areas we gain two very important things. Firstly, they will be clearer, so there will be no need for those working in such rooms to raise their voices and communication between them will improve significantly. Secondly, the voice will not spread as much as before.

Significant improvement of acoustic properties in rooms with the help of such hybrid systems not only improves communication, but also reduces stress in people living in them. What is more, the impact of working in such rooms on hearing loss will also be smaller.

Until now, flat perforated solutions of this type were mainly available. Decorative acoustic panels will therefore be a large variety also from a visual point of view. The spatial form, which is a unique solution on a global scale, has an impact on the multi-sensory reception, and will definitely improve the appearance of the rooms in which it will appear. The system will therefore be perceived with the help of different senses, not only because of the 3D form, but also because of the texture, acoustic properties or the colour used. It will therefore be an excellent way to break the previously dominant monotony, which was easy to see in all types of office buildings, schools and hospitals.

Unfortunately, designers rarely considered other senses besides sight. But the sensory design finally changes and also involves hearing and touch. The spatial form will change depending on the angle of light at different times of the day, which will affect the mental comfort of people in a given room.

EHO Muterboard acoustic decorative panels, thanks to this solution, perfectly fit into the latest world trends, and at the same time they are a completely innovative product. This is because a unique hybrid acoustic system with a 3D structure, which was created from renewable raw material, i.e. wood, was created.

Currently available on the market acoustic panels are made of mineral wool and glass wool, which is obtained from non-renewable raw materials. You can also buy veneered panels, which, however, are 100% absorbers or 100% diffusers. Of course, there are also wooden decorative panels on sale, but they do not have acoustic properties.

EHO Muteboard decorative acoustic panels are a hybrid acoustic system, i.e. both absorber and diffuser, have a 3D structure and are made of a natural material, i.e. wood. Thanks to advanced design techniques, their production time is shorter and the entrepreneur, the designer and the research and development centre work closely together.