The Experts below are selected from a list of 75 Experts worldwide ranked by ideXlab platform
Hakki Eres - One of the best experts on this subject based on the ideXlab platform.
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Bi-objective optimization of pylon-engine-nacelle assembly: weight vs. tip clearance criterion
Structural and Multidisciplinary Optimization, 2013Co-Authors: Dimitri Bettebghor, Christophe Blondeau, David Toal, Hakki EresAbstract:A realistic application of advanced structural and multi-objective optimization for the design of a fully assembled aircraft powerplant installation is presented. As opposed to the classical design process of powerplant installation that does not consider the influence of pylon sizing over engine efficiency, we develop in the present a fully integrated approach where both pylon and compressor intercase are designed at once. The main objective is to consider the impact of weight over tip clearance performance criterion and see how these two objectives are antagonistic. In this work, we perform in the same design session tasks traditionally devoted to the Airframe Manufacturer and aero-engine Manufacturer. The overall weight of the assembly is minimized with respect to Specific Fuel Consumption (SFC) criterion. One interesting aspect of the process is that SFC criterion is based on highly proprietary models and its simulation and call within an optimization process is made available through the development of a webservice. One major phenomenon to consider in both pylon and engine design is Fan Blade Off (FBO) event, i.e. the sudden release of a blade. This event causes high impact loads and must be considered carefully in the design. Such a simulation is not an easy task and several nonlinear phenomena must be addressed (e.g. rotordynamics), not to mention the integration of this nonlinear dynamic response in a static structural optimization process. This article describes how the design of the full assembly is performed taking into account both objectives. Such a problem lies in multi-objective optimization field and then we describe the method we use to solve such a problem. The simulation of an FBO post-impact rotor dynamics is also described and we end up with the final results that show the influence of pylon-engine weight sizing over SFC.
Jim Hoppins - One of the best experts on this subject based on the ideXlab platform.
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small Airframe Manufacturer s icing perspective
2009Co-Authors: Jim HoppinsAbstract:This viewgraph presentation describes the icing effects, risk mitigation practices, and icing certifications for various Cessna small aircraft models. NASA's role in the development of simulation tools for icing certifications is also discussed.
Dimitri Bettebghor - One of the best experts on this subject based on the ideXlab platform.
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Bi-objective optimization of pylon-engine-nacelle assembly: weight vs. tip clearance criterion
Structural and Multidisciplinary Optimization, 2013Co-Authors: Dimitri Bettebghor, Christophe Blondeau, David Toal, Hakki EresAbstract:A realistic application of advanced structural and multi-objective optimization for the design of a fully assembled aircraft powerplant installation is presented. As opposed to the classical design process of powerplant installation that does not consider the influence of pylon sizing over engine efficiency, we develop in the present a fully integrated approach where both pylon and compressor intercase are designed at once. The main objective is to consider the impact of weight over tip clearance performance criterion and see how these two objectives are antagonistic. In this work, we perform in the same design session tasks traditionally devoted to the Airframe Manufacturer and aero-engine Manufacturer. The overall weight of the assembly is minimized with respect to Specific Fuel Consumption (SFC) criterion. One interesting aspect of the process is that SFC criterion is based on highly proprietary models and its simulation and call within an optimization process is made available through the development of a webservice. One major phenomenon to consider in both pylon and engine design is Fan Blade Off (FBO) event, i.e. the sudden release of a blade. This event causes high impact loads and must be considered carefully in the design. Such a simulation is not an easy task and several nonlinear phenomena must be addressed (e.g. rotordynamics), not to mention the integration of this nonlinear dynamic response in a static structural optimization process. This article describes how the design of the full assembly is performed taking into account both objectives. Such a problem lies in multi-objective optimization field and then we describe the method we use to solve such a problem. The simulation of an FBO post-impact rotor dynamics is also described and we end up with the final results that show the influence of pylon-engine weight sizing over SFC.
Duncan Shepherd - One of the best experts on this subject based on the ideXlab platform.
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Health Monitoring Technology for the Integrated Wing
7th AIAA ATIO Conf 2nd CEIAT Int'l Conf on Innov and Integr in Aero Sciences 17th LTA Systems Tech Conf; followed by 2nd TEOS Forum, 2007Co-Authors: Duncan ShepherdAbstract:Despite the many development which have taken place over the last 40 years to optimize the maintenance processes supporting the operation of civil aircraft, ever present commercial pressure mean that there is still a great deal of interest in further improvements. One option which is receiving increasing attention amongst Airframe Manufacturer and operator alike, is that advanced health management technology can yield very significant benefits in further optimization of this process. The HealthMap programme, funded by the South East England Development Agency and incorporated as work package 6 of Integrated Wing, has been designed to address many of the technological challenges facing the development and implementation of this technology for civil aircraft. The paper gives a description of the various different drivers which are motivating this interest, and the technologies which are being developed to provide the required capability.
M. J. L. Van Tooren - One of the best experts on this subject based on the ideXlab platform.
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A KBE-enabled design framework for cost/weight optimization study of aircraft composite structures
2014Co-Authors: Hai-hua Wang, G. La Rocca, M. J. L. Van ToorenAbstract:Traditionally, minimum weight is the objective when optimizing Airframe structures. This optimization, however, does not consider the manufacturing cost which actually determines the profit of the Airframe Manufacturer. To this purpose, a design framework has been developed able to perform cost/weight multi-objective optimization of an aircraft component, including large topology variations of the structural configuration. The key element of the proposed framework is a dedicated knowledge based engineering (KBE) application, called multi-model generator, which enables modelling very different product configurations and variants and extract all data required to feed the weight and cost estimation modules, in a fully automated fashion. The weight estimation method developed in this research work uses Finite Element Analysis to calculate the internal stresses of the structural elements and an analytical composite plate sizing method to determine their minimum required thicknesses. The manufacturing cost esti...
