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Showing 1 to 20 of 26 for “"high-speed civil transport"”.
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Multidisciplinary optimization of high-speed civil transport configurations using variable-complexity modeling
… configuration optimization is presented for the high-speed civil transport (HSCT). Methods to parameterize the wing shape, fuselage shape and nacelle placement are described. Variable-complexity design strategies are used to combine conceptual and preliminary-level design approaches, both to …
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Trim, Control, and Performance Effects in Variable-Complexity High-Speed Civil Transport Design
… multidisciplinary design methodology for a high speed civil transport. We optimize the design for minimum take off gross weight, including both aerodynamics and structures to find the wing planform and thickness distribution, fuselage shape, engine placement and thrust, using 29 design …
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Structural optimization and its interaction with aerodynamic optimization for a high speed civil transport wing
… optimization procedures is presented for the high speed civil transport design (HSCT). Variable-complexity analysis methods are used to reduce the computational expense. A finite element-model based structural optimization procedure with flexible loads is implemented to evaluate the wing …
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Implementing Aerodynamic Predictions from Computational Fluid Dynamics in Multidisciplinary Design Optimization of a High-Speed Civil Transport
… aerodynamic-structural optimization of a High-Speed Civil Transport (HSCT) is presented. To achieve this goal, the method must alleviate the large computational burden associated with performing CFD analyses and reduce the numerical noise present in the analyses. This is accomplished …
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Technical cost modeling for evaluation of developmental manufacturing technologies : a case study of Boeing's high speed civil transport
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, and Sloan School of Management, 1991.
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Response surface approximations for pitching moment including pitch-up in the multidisciplinary design optimization of a high-speed civil transport
… characteristic into the design optimization of a high-speed civil transport has been developed. Previously, the tendency of a high-speed aircraft to become uncontrollable (pitch-up) at high angles-of-attack during landing or takeoff for some wing shapes could not be included directly in the design …
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The Perception of Travel Agents as to Passenger Acceptance of the High Speed Civil Transport in Commercial Airline Service: A Study of Tomorrow's Transpacific Air Travel
… technology for a new-generation supersonic transport aircraft is being developed. To determine if air travelers will choose this aircraft, the High Speed Civil Transport (HSCT), as their mode of air transportation on transpacific routes, a self-developed questionnaire was sent to randomly …
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A coarse-grained variable-complexity MDO paradigm for HSCT design
… for the particular instance of the design of a high speed civil transport (HSCT). This paradigm interleaves the disciplines at one level of complexity, and processes them hierarchically at another level of complexity, achieving parallelism within disciplines, rather than across disciplines. A …
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A Study of the Thermal Properties of PETI-5/IM7
… that shows a great deal of potential in the high-speed aircraft and the aerospace industry. PETI-5 has been used for the High Speed Civil Transport (HSCT), a supersonic passenger aircraft in development at NASA. In this project, four staging samples, one fresh sample, one fully cured sample …
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Variable-Complexity Response Surface Approximations For Wing Structural Weight in HSCT Design
… to wing bending material weight of a High Speed Civil Transport (HSCT) is presented. Response surface methodology is used to fit a quadratic polynomial to data gathered from a series of structural optimizations. Several techniques are employed in order to minimize the number of …
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Distributed Parallel Processing and Dynamic Load Balancing Techniques for Multidisciplinary High Speed Aircraft Design
… here is configuration optimization of a high speed civil transport (HSCT), and the efficient parallelization of the embedded paradigm for reasonable design space identification. Two distributed dynamic load balancing techniques (random polling and global round robin with message …
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Variable-Complexity Approximations for Aerodynamic Parameters in Hsct Optimization
… in terms of 29 design variables for the High Speed Civil Transport (HSCT) configuration and performance design is presented. Response surface model methodology is used to fit quadratic polynomials to data gathered from a series of numerical analyses of different HSCT designs. Several …
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3-D flow calculations of a bifurcated 2D supersonic engine inlet at takeoff
… transition, bifurcated, 2D high speed civil transport engine inlet at takeoff. The objective of the study was to obtain the causes of flow distortion at the inlet fan face. The inlet was modeled with the centerbody in the fully collapsed takeoff position. A single block, …
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Development of Approximations for HSCT Wing Bending Material Weight using Response Surface Methodology
… function for wing bending material weight of a High Speed Civil Transport (HSCT) is described. The weight function is based on HSCT configuration parameters. A response surface methodology is used to fit a quadratic polynomial to data gathered from a large number of structural optimizations. To …
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Integrated aerodynamic-structural wing design optimization
… design examples. The first is a subsonic transport aircraft with a composite forwardswept wing. The aerodynamic modeling for this case is provided by vortex-lattice theory and the structural model initially utilizes finite-element analyses. Even with efficient sensitivity methods, the …
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Comparison of the aeroacoustics of two small-scale supersonic inlets
… which inlet would be more suitable for a High Speed Civil Transport (HSCT) aircraft during approach and takeoff flight conditions. The comparison was made between an axisymmetric supersonic P inlet and a bifurcated two-dimensional supersonic inlet. The 1/14 scale model supersonic inlets …
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Effect of struts on aeroacoustics of axisymmetric supersonic inlets
… axisymmetric supersonic inlet designed for the high speed civil transport aircraft. A 10.4 cm (4.1 in.) turbofan engine simulator was used in conjunction with the inlet to provide the typical noise signature of a high bypass turbofan engine. Two inlet configurations were investigated in this …
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High resolution algorithms for the Navier Stokes equations for generalized descretizations
… to discretize the surface grids for bodies with high curvature. In addition, mesh refinement algorithms were implemented to improve the surface grid integrity. Examples studied include a Glasair fuselage, High Speed Civil Transport, and the ONERA M6 wing. The role of reconstruction as applied to …
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Aircraft Multidisciplinary Design Optimization using Design of Experiments Theory and Response Surface Modeling Methods
… and supersonic aerodynamic performance of high-speed civil transport (HSCT) aircraft configurations. The aerodynamic models created using the two methods outlined above are employed in HSCT optimization studies so that the detrimental effects of numerical noise are reduced or eliminated …
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Statistical Modeling of Simulation Errors and Their Reduction via Response Surface Techniques
… of computational simulations in design of a high-speed civil transport (HSCT) are investigated. First, discretization error from a supersonic panel code, WINGDES, is considered. Second, convergence error from a structural optimization procedure using GENESIS is considered along with the …
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