Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 6 of 6 for “"HELS"”.
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Reconstruction Resolution Of Coherent Point Sources With Helmholtz Equation Least Squares
… sources using Helmholtz Equation Least Squares (HELS) method based on measurements in violation of Nearfield Acoustical Holography (NAH) resolution guidelines. In HELS, the Helmholtz equation is solved by matching a series of localized spherical expansion functions to the measured pressures in …
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Helmholtz Equation Least Squares Based Near-Field Acoustic Holography With Laser
<p>This dissertation presents the HELS based NAH with laser and use normal surface velocity as input in near-field acoustic holography. The conventional HELS based NAH uses acoustic pressure as input to reconstruct sound field quantities, while this modified HELS based NAH with laser utilizes the …
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Visualizing Interior And Exterior Jet Aircraft Noise
… the Helmholtz Equation Least Squares (HELS) based nearfield acoustic holography will be used to understand noise transmission caused by jet engine and turbulence into the fuselage of a jet aircraft cruising at 30,000 ft. </p> <p>Modern propulsive jet engines produce exterior noise …
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Staff development and wider institutional approaches around technology enhanced learning in higher education institutions in the United Kingdom from the heads of e-learning perspective
… it focuses on the Heads of e-Learning (HeLs) perspective of the needs of tutors who teach in blended and online environments, the ways HEIs in the United Kingdom (UK) address these needs and on institutional issues around the deployment and support of Technology Enhanced Learning (TEL) …
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Structure Borne Noise Analysis Using Helmholtz Equation Least Squares Based Forced Vibro Acoustic Components
… technology is Helmholtz equation least squares (HELS) based nearfield acoustic holography method. In this study, the HELS formulations derived in spherical co-ordinates using spherical wave expansion functions utilize the input data of acoustic pressures measured in the nearfield of a vibrating …
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Power and energy storage requirements for ship integration of solid-state lasers on naval platforms
… States Navy's interest in high-energy lasers (HELs) dictates the need for further study into the propagation of laser light through different atmospheric conditions. Due to the amount of energy required to power these laser weapons systems and the limited amount of available energy onboard …