The Fraunhofer LBF has developed loudspeakers made of electro-active polymers (EAP) and integrated them into a conventional double glazed window to reduce noise transmission from outside, especially in the frequency range where traditional windows have a lack of performance. The electro-active polymer allows the design of loudspeakers with quite flexible shapes, low weight compared to electrodynamic systems and a broader frequency range than e.g. piezoceramic based solutions. The concept is lighter than a laminated double glazed window with similar performance coefficients and outperforms conventional double glazed windows of the same mass.
Its field of application covers private households, facades of high rise buildings and special noise insulation applications, such as recording studios. Especially for high traffic areas, like settlements near airports or closeby train lines, the active window with EAP-loudspeakers offers a valuable solution.
Fraunhofer LBF in Darmstadt is one of the most traditional institutes of the Fraunhofer-Gesellschaft. Over 75 years ago, the former “Laboratory for Structural Durability LBF” shaped a completely new area of research that even back then was already economically significant and, up to today, has lost none of its topicality and pertinence. Particularly in the last decade, the institute developed its competence center both in breadth and depth on the basis of experimental structural durability with a great deal of innovation force and high degree of dynamics. Additional market segments beyond the traditional vehicle and mechanical engineering branches of industry were opened up.
More than 550 scientists, engineers, technicians, administrators and experts from diverse disciplines bring their know-how into interdisciplinary project work and services that extends beyond the boundaries of each subject matter to the advantage of customers and partners. They take up future-oriented topics, develop them to product and process innovations in close cooperation with their customers and thus set new trends.
The Fraunhofer LBF teams offer services along the entire valueadded chain starting with the material and its processing up to the finished component, the complex system, its qualification with regard to safety and reliability, and performance from product design to verification. Particularly in the area of plastics, the institute provides support at an early stage of the value added chain with polymer synthesis and in-depth material
characterization.
Comprehensive material and energy-efficient solutions are developed in the areas of vibration technology, lightweight construction, reliability and polymer technology – tailored to the individual needs of each customer. Fraunhofer LBF reaches a number of different markets with its characteristic, wide-reaching competence and service portfolio, particularly in rail transport technology, ship building, aviation, mechanical and plant engineering, energy technology, building industry, medical technology and the chemical industry.
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