Sökning: "Impedance tube"

Hittade 5 uppsatser innehållade orden Impedance tube.

  1. 1. Simulating Low Frequency Reverberation in Rooms

    Master-uppsats, KTH/Marcus Wallenberg Laboratoriet MWL

    Författare :Mattias Svensson; [2020]
    Nyckelord :Low frequencies; Room acoustics; Finite Difference Time Domain method; FDTD.; Rumsakustik; låga frekvenser; Finite Difference Time Domain metoden; FDTD.;

    Sammanfattning : The aim of this thesis was to make a practical tool for low frequency analysis in room acoustics.The need arises from Acad’s experience that their results from simulations using raytracing software deviate in the lower frequencies when compared to field measurements inrooms. LÄS MER

  3. 2. Multilayered Lamination for Acoustic Board Manufacturing

    Master-uppsats, Lunds universitet/Innovation

    Författare :Angelica Madeland; [2019]
    Nyckelord :Acoustic panels; lamination techniques; sound absorption; insulation; Technology and Engineering;

    Sammanfattning : Saint-Gobain Ecophon manufactures acoustic ceiling tiles made primarily of glass wool and are interested in exploring the idea of a new manufacturing technique – using thinner layers of material and laminating these together. The possible benefits are, amongst others, the ability to use different kinds of material where they are the most useful, reduced costs, larger amounts of recycled material, less material waste, and more customizability. LÄS MER

  4. 3. Absorption properties of green sound barriers

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Sherif Fouda; [2018]
    Nyckelord :Impedance tube; Sound absorption measurement; transfer function; three microphones; Sound barrier; ISO 10534-2; ASTM E2611-09.;

    Sammanfattning : This thesis was conducted on behalf of Butong AB, who wanted to test and develop an environmental friendly, so called green sound barrier, which combines both art and science.Different configurations of the product were proposed by the company with various filling materials, as it was predicted that the filling materials would be the main sound absorbent among all parts of the structure. LÄS MER

  5. 4. Bicomponent Fiber in Sound Absorbent Production : Investigation of using bicomponent fiber as adhesive between woven and nonwoven textile and how it affects the sound absorption

    Magister-uppsats, Högskolan i Borås/Institutionen Textilhögskolan

    Författare :KATARINA LINDSTRÖM; [2014]
    Nyckelord :Bicomponent fiber; sound absorbent; impedance tube; nonwoven; adhesion strength; air permeability; transfer function method.;

    Sammanfattning : A new way of adhering woven textile to a nonwoven backing was explored, the end product in mind being a sound absorbent panel. Today a hot melt adhesive is sprayed on the nonwoven with woven decorating textile put on top before compression molding. LÄS MER

  7. 5. Investigation og Nonlinear Acoustical Properties of Perforated Plate Samples and Samples of Aircraft Engine Liners

    Master-uppsats, KTH/Farkost och flyg

    Författare :Daniel Pimenov; [2011]
    Nyckelord :;

    Sammanfattning : Five samples, three perforated plates and two more realistic samples used in aircraft engine liners have been investigated. All the samples when exposed to high amplitude sound waves show nonlinear acoustic behavior which depends on acoustic velocity at the plate position. LÄS MER