Search for dissertations about: "lined ducts"
Found 3 swedish dissertations containing the words lined ducts.
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1. Modelling and Characterization of Perforates in Lined Ducts and Mufflers
Abstract : Increased national and international travel over the lastdecades has caused an increase in the global number ofpassengers using different means of transportation. Greateffort is being directed to improving the noisy environment inthe residential community. READ MORE
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2. Innovative noise control in ducts
Abstract : The objective of this doctoral thesis is to study three different innovative noise control techniques in ducts namely: acoustic metamaterials, porous absorbers and microperforates. There has been a lot of research done on all these three topics in the context of duct acoustics. READ MORE
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3. Optimal damping and slow sound in ducts
Abstract : The thesis is dedicated to expanding knowledge on two duct acoustic issues including: 1) the optimal damping of low frequency sound and 2) the development and application of ‘slow sound’.To address the first issue, the ‘Cremer impedance’ proposed more than half a century ago has been revisited and further developed. READ MORE