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Optimal Design of an Enclosure for a Portable Generator

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dc.contributor.advisor Saunders, William R. en_US
dc.contributor.advisor Nelson, Douglas J. en_US
dc.contributor.advisor Robertshaw, Harry H. en_US
dc.contributor.author Blanks, Joseph E. en_US
dc.date.accessioned 2011-08-05T14:52:19Z
dc.date.available 2011-08-05T14:52:19Z
dc.date.issued 1997-02-07 en_US
dc.identifier.other etd-145110201974500 en_US
dc.identifier.uri http://hdl.handle.net/10919/9585
dc.description.abstract A 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.format.medium ETD en_US
dc.publisher Virginia Tech en_US
dc.relation.haspart etd.pdf en_US
dc.rights The 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.source.uri http://scholar.lib.vt.edu/theses/available/etd-145110201974500 en_US
dc.subject acoustic isolation en_US
dc.subject insertion loss en_US
dc.subject passive acoustical treatment en_US
dc.subject close fitting enclosure en_US
dc.subject optimization en_US
dc.subject acoustic enclosure en_US
dc.title Optimal Design of an Enclosure for a Portable Generator en_US
dc.type Thesis en_US
dc.contributor.department Mechanical Engineering en_US
dc.description.degree MS en_US


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