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 19 of 19 for “"sonic boom"”.
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Sonic boom considerations in preliminary design of supersonic aircraft
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2002.
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Shape Optimization of Supersonic Bodies to Reduce Sonic Boom Signature
… interest by aerospace industry and NASA in supersonic transport aircraft. In recent studies, the emphasis has been on shape optimization of supersonic plane to reduce the acoustic signature of sonic boom resulting from the supersonic aircraft at high altitude in cruise flight. Because of the …
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Acoustic theory of sonic boom propagation in an inhomogeneous atmosphere
… the shook waves produced by an aircraft in supersonic flight through an atmosphere in which the speed of sound decreases linearly with altitude. The problem is first studied in terms of the geometry of the rays along which the shock wave travels away from its point of origin and into the …
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Sonic boom prediction methods using feature-based adaptation of unstructured meshes
This study examines the improvement of near-field sonic boom prediction of an inviscid supersonic configuration using two grid generation refinement procedures. The first method uses P_HUGG, a parallel hierarchical Cartesian mesh generation algorithm to generate a volume mesh, with the …
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On the Application of an Output-based Adaptive, Higher-order Finite Element Method to Sonic Boom Propagation
The reduction of sonic boom loudness to within acceptable limits is a crucial factor for the viability of supersonic aircraft. This thesis presents a computational framework for simulating sonic boom propagation using an output-based adaptive, higher-order finite element method. The research …
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Experimental Characterization and Analysis of Simple Residential Structures Subjected to Simulated Sonic Booms
… the FAA limits overland flight of supersonic airplanes due to the negative effect of the sonic boom on communities. The annoyance produced by the impulsive signature of sonic booms, particularly indoors, cannot exceed that of the broadband, low-overpressure noise produced by subsonic …
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Computational Assessment of Flow through a High-Flow Nacelle Bypass for Low Supersonic Boom
Sonic boom minimization is a challenge faced by the aviation community to enable high- speed civilian aircraft flying supersonically over populated land. One of the concepts proposed to reduce sonic boom incorporates a high-flow secondary nacelle bypass to enclose the engine and its protrusions …
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Output-Only Experimental Modal Testing of Large Residential Structures and Acoustic Cavities Using Sonic Booms
… using each structure's response to a simulated sonic boom, an impulsive input. The results of these analyses along with the results obtained from a finite element model are compared. Then, the interior cavities enclosed by the residential structures are examined using NExT. Therefore, this …
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Wind tunnel testing of a nacelle bypass concept for a quiet supersonic aircraft
Sonic boom attenuation is a considerable design challenge to enable civilian aircraft to operate at supersonic flight conditions. One technology proposed by Gulfstream Aerospace Corporation for the production of low-noise supersonic aircraft is the high-flow nacelle bypass concept in which an outer …
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An experimental study of the aft guide vanes of an engine bypass nacelle for low-boom supersonic flight
Due to the large disturbance created by the sonic boom, supersonic flight is strictly controlled by the FAA. One way in which to minimize the sonic boom is through shape-tailoring of the aircraft body and of the propulsion system. To this end, a new supersonic engine concept has been proposed, …
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Nonlinear Acoustics and an Inverse Scattering Problem
… main focus is on nonlinear acoustics, looking at sonic boom propagation in a physically realistic atmosphere, whilst a secondary part will look at the problem of landmine detection and how to improve the target detection rates. The work on nonlinear acoustics emerged as a desire to model the …
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Global Demand Model to Estimate Supersonic Commercial Services
Not too long ago, commercial supersonic aircraft flights were part of the air transportation system. In the 1970's we had the Russian-built Tupolev Tu-144 and the BAC/Aerospatiale Concorde, the latest being tin operation for 27 years. The work documented in this dissertation focused on the …
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On vibration and stability problems of laminated plates and shells using shear deformation theories
… cross-ply laminated plates, subjected to a sonic-boom type loading, is developed using the third-order shear deformation plate theory of Reddy and the first-order shear deformation plate theory. The nonlinear dynamic equations of the first-order shear deformation plate theory and the …
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Anisotropic output-based adaptation with tetrahedral cut cells for compressible flows
… adaptive method is applied to a series of sonic boom test cases and the automated ability to correctly estimate pressure signatures at several body lengths is demonstrated starting with initial meshes of a few thousand control volumes. Second, a new framework for adaptation is introduced in …
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Design and development of a rectangular supersonic wind tunnel facility for the study of shock/boundary layer interactions
… research work of this thesis was part of the low-boom supersonic inlet project conducted by NASA, Gulfstream Aerospace Corporation, Rolls-Royce, and the University of Illinois. The low-boom supersonic inlet project itself was part of a new supersonic business jet design. The primary goal of the …
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Development of a Model for Predicting the Transmission of Sonic Booms into Buildings at Low Frequency
… industry in the development of a quieter supersonic transport have opened the possibility of overland supersonic flights, which are currently banned by aviation authorities in most countries. For the ban to be lifted, the sonic booms the aircraft generate at supersonic speed must be acceptable …
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Air Transportation Modeling to Evaluate Airport Runway Infrastructure and Supersonic Transport Demand
… prediction of worldwide demand for future supersonic aircraft. Both topics aim to improve air transportation mobility, which benefits society and contributes to economic growth. The Federal Aviation Administration (FAA) Advisory Circular (AC) 150/5325-4B contains the current method of estimating …
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An experimental study of the forward guide vanes of an engine bypass nacelle for low-boom supersonic flight
Made available in DSpace on 2011-08-25T22:16:42Z (GMT). No. of bitstreams: 3 Herrera_Arthur.pdf: 9040481 bytes, checksum: b1cb32088f9dbae91d7f22098b17feb2 (MD5) license.txt: 4064 bytes, checksum: e734bd04ed7c751742bd7380d9b55410 (MD5) Herrera_Arthur.docx: 22589106 bytes, checksum: …
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Design-to-Noise Methodologies for Future Supersonic Aircraft: Experimental, Numerical, and Analytical Approaches
L'abstract è presente nell'allegato / the abstract is in the attachment