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dc.contributor.advisorSaunders, William R.en_US
dc.contributor.advisorNelson, Douglas J.en_US
dc.contributor.advisorRobertshaw, Harry H.en_US
dc.contributor.authorBlanks, Joseph E.en_US
dc.description.abstractA simple, effective design for enclosing portable generators to reduce the radiated noise is an idea that seems to be desired by the consumers in this market. This investigation is to determine the feasibility of producing such an enclosure for a generator. Several engineering aspects are incorporated in the design of the enclosure. The first, and probably the most paramount, are the acoustical effects of the enclosure itself. The investigation follows the theories for insertion loss of a close fitting enclosure. The thesis examines the system behavior of a close fitting enclosure that most acoustic text books ignore and how the material stiffness, density and source-to-enclosure distance affect the insertion loss and effectiveness of the enclosure. Measured and theoretical sound pressure level around the generator before and after the application of the enclosure are presented using standards described by ISO standard 1344. The second important consideration for the enclosure design involves the heat transfer characteristics. The requirements of cooling air to the generator are discussed. Also presented are some acoustic design considerations to prevent any "direct line of sight" to any of the necessary openings which will help in the overall insertion loss. The use of an optimal engineering design technique is presented, demonstrating its strengths and weakness in this application. The optimization method used for the study is the Hooke and Jeeves, or pattern search method. This method solved for the optimum material properties in approximately 30 iterations depending on the initial starting points and the desired weighting parameters.en_US
dc.publisherVirginia Techen_US
dc.rightsThe authors of the theses and dissertations are the copyright owners. Virginia Tech's Digital Library and Archives has their permission to store and provide access to these works.en_US
dc.subjectacoustic isolationen_US
dc.subjectinsertion lossen_US
dc.subjectpassive acoustical treatmenten_US
dc.subjectclose fitting enclosureen_US
dc.subjectacoustic enclosureen_US
dc.titleOptimal Design of an Enclosure for a Portable Generatoren_US
dc.contributor.departmentMechanical Engineeringen_US

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