Computer-Aided Optimization of the Acoustic
Efficiency of Non-Wovens for an Interated
Product Policy

H. Andrä, A. Wiegmann
Fraunhofer Institute for Industrial Mathematics (ITWM)
Kaiserslautern, Germany

A. Müller, B. Riedel, U. Widmann
Audi AG, Ingolstadt, Germany

U. Becker, L. Dejaeger
Faurecia, Sassenburg, Germany

S. Herrmann, U. Hornfeck, K. Tröger
Sandler AG, Schwarzenbach/Saale, Germany

The goal of the project is the replacement of conventional non-wovens
by sortpure materially reusable non-wovens for acoustic trims, which 
are used in the automobile interior. With the developentent of acoustic 
absortment treatments from innovative textile materials all subsantial
aspects, i.e. interior noise in vehicle, energy consumption for the
production of the trim and for the operation of the automobile, and also
recycling of the material, must be considered along the entire product 
life cycle (Intergrated Product Policy).

The solution is realized by material and structural optimization. The 
main objective of the optimization is the attainment of a desired acoustic
absorption whereby several futher restrictions must be considered, in order
to achieve other functoinalities, low costs and environmental protection 
goals. Therefore, new simulation techniques for the acoustic design of 
non-woven materials are presented in the lecture. Only computer simulations
enable extensive variant investigations. Thus time-consuming, material- and
costintensive building of prototyps can be avoided to a large extent. The 
most favorable choice of the textile material and of the material processing
can be determined systematically.

The practical profit in the automotive industry is the increase of the 
recycling ratio, a weight reduction, associated with a lower energy consumption,
and a increased acoustic effectiveness and thus a more pleasant driving feeling.

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