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    Dynamic property characterization of polyurea aerogel materials using a laser Doppler vibrometer

    Author
    Whitney, Matthew
    View/Open
    179718_Whitney_rpi_0185N_10698.pdf (2.510Mb)
    Other Contributors
    Xiang, Ning; Braasch, Jonas; Markov, Ivan;
    Date Issued
    2015-08
    Subject
    Architectural sciences
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
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    URI
    https://hdl.handle.net/20.500.13015/2417
    Abstract
    This project seeks to characterize the dynamic material properties of a cross-linked, nanoscale, polyurea aerogel utilizing a new transfer function method. This method is able to determine the dynamic properties over a wide frequency range using impulse responses gathered from the top and bottom of the material by both accelerometers and a laser Doppler vibrometer. The dynamic material properties that can be calculated using this method include Young's modulus, density, and the speed of sound in the material. Different mounting systems for the shaker and the effect of test sample surface area and thickness will be examined. A method for using two different thicknesses of aerogel to resolve the material's dynamic stiffness was discovered. The advantages and disadvantages of using a laser Doppler vibrometer instead of an accelerometer will be studied. The data found that using smaller, circular plates and directly mounting the shaker to a marble floor resulted in the widest usable frequency range. A very low speed of sound was found for the material and confirmed using data from transmission loss measurements.;
    Description
    August 2015; School of Architecture
    Department
    School of Architecture;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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