Browsing by Author "Yilmaz, Nazire Deniz"

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    Acoustic Properties of Biodegradable Nonwovens
    (2009-12-07) Yilmaz, Nazire Deniz; Nancy Powell, Committee Co-Chair; Pamela Banks-Lee, Committee Co-Chair; Nancy Cassill, Committee Member; Stephen Michielsen, Committee Member
    ABSTRACT YILMAZ, NAZIRE DENIZ. Acoustical Properties of Biodegradable Nonwovens.(Under the direction of Nancy Powell and Pamela Banks-Lee.) The purpose of this study is to provide a better understanding of acoustical properties of nonwovens, and to model the noise control behavior in terms of material and treatment parameters. A review of existing models on sound absorption of fibrous materials, coupled with experimental data will help in modeling sound absorption in multi-layer needle-punched nonwovens fabrics of different fibers: hemp, polylactide, polypropylene, and glassfiber. The effects of several treatments, which the materials may undergo during sound absorber manufacturing, namely alkalization, compression and heat treatments are investigated. The collected data is evaluated by experts. Expert evaluation further provides information about the market demands about sound absorbers, and the perception of the designed nonwovens through the eyes of professionals. This research provides a contribution to the body of knowledge on the sound absorption properties of nonwovens, provides a better understanding of the effects of some manufacturing processes on nonwovens’ noise control performance and contributes to the wider adoption of nonwovens as sound absorbers.