The paper collects the first results obtained in a small transmission loss facility built for acoustic measurements on coupons of composite panels candidate for aircraft fuselage applications. The use of composite materials is employed for their better structural efficiency (strength over weight) than metallic alloys, which have played, so far, a predominant role in aeronautical application, mainly for commercial airplanes. The selection of candidate materials for aeronautical application, however, does not have to take into account the structural efficiency alone, but many other characteristics such as the fatigue behaviour, the environmental interaction, the manufacturing costs and so on, just to name a few. One of the additional item parameter which arises to an important factor is the passenger interior comfort, considering both environmental parameters as well as vibration and acoustic main figures. In view of continuing improved knowledge of the dynamic characteristics of composite panels, both numerical simulation and laboratory testing are the necessary elements which are the backbone of the mentioned research program. One of the aspects pursued in our Department has been the development of a small transmission loss facility for testing different solutions and proposals of treatments on composite panels. Several advantages are linked to a small transmission TL facility in comparison to the standard big facilities, even if much care must be used when dealing with results in the low frequency region where such facilities exhibits their main drawbacks. The paper will present the new small TL facility developed in our Dept., including the possibility to consider low temperature testing, the initial qualification tests and some preliminary results on coupon panels used for the first testing campaign.
Acoustic measurements in a small transmission loss facility
Akustische Messungen in einer Anordnung mit kleinem Übertragungsverlust
2006
6 Seiten, 10 Bilder, 1 Tabelle, 10 Quellen
Conference paper
Storage medium
English
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