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Daniel Guggenheim School of Aerospace Engineering
Daniel Guggenheim School of Aerospace Engineering
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ItemEffects of Alternative Wing Structural Concepts on High Speed Civil transport Life Cycle Costs(Georgia Institute of Technology, 1996-04) Marx, William J. ; Mavris, Dimitri N. ; Schrage, Daniel P.An integrated design and manufacturing approach allows economic decisions to be made that reflect the entire system design as a whole. In order to achieve this objective, integrated cost and engineering models were developed and utilized within a focused design perspective. A framework for the integrated product and process design of an aircraft system with a combined performance and economic perspective is described in this paper. This framework is based on the concept of
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ItemA Hierarchical Aircraft Life Cycle Cost Analysis Model(Georgia Institute of Technology, 1995-09) Marx, William J. ; Mavris, Dimitri N. ; Schrage, Daniel P.This paper presents an exploratory study for identification and quantification of the economic benefits or implications associated with wing cost variations. A hierarchical cost model structure is used to determine life cycle effects of design and manufacturing alternatives for the major structural components of the wing of a High Speed Civil Transport aircraft concept. Preliminary results are presented relating the effects of up to a 25% variation in wing cost to overall manufacturing and operational returns on investment. It was discovered that a 25% reduction in wing costs, relative to a baseline wing, results in approximately a 3% increase in return on investment for the manufacturer. In addition, deviations in wing cost of 10% and 25% yielded acquisition price differences of 2.25% and 6.0% respectively. These relatively small percentage differences in acquisition costs produced no significant changes in operational costs of the aircraft. Small changes were evident in the costs of financing and depreciating the aircraft, but these minor differentials had a negligible effect on the airline return on investment.
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ItemAn Application of Artificial Intelligence for Computer-Aided Design and Manufacturing(Georgia Institute of Technology, 1995-07) Marx, William J. ; Schrage, Daniel P. ; Mavris, Dimitri N.The knowledge required to integrate aircraft manufacturing characteristics and constraints into the structural design process is beyond the proficiency of a single engineer. Concurrent Engineering (CE) enables the integration of design with manufacturing to permit trades based not only on product performance, but also on other criteria not easily evaluated, such as producibility and support. A decision support system, or Knowledge-Based System, that can direct manufacturing issues during the preliminary design process would be an invaluable tool for system designers. The objective of this technical paper is to clearly describe the development of a Knowledge-Based System (KBS) for the determination of manufacturing processes for selected airframe structural components for the wing of the High Speed Civil Transport (HSCT). The KBS evolving with this research will be utilized within an integrated design environment along with existing tools to demonstrate its functionality as a design tool. The system will empower engineers to design the strongest, lightest possible wing structure at the least cost that meets the load-carrying requirements for a specified aircraft range. The paper outlines the knowledge- and rule-base development required to build the KBS. The interfaces and relations to CAD packages, external synthesis and analysis codes, as well as links to cost estimating software and methods are discussed.
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ItemKnowledge-based Manufacturing and Structural Design for a High Speed Civil Transport(Georgia Institute of Technology, 1994-12) Marx, William J. ; Mavris, Dimitri N. ; Schrage, Daniel P.The aerospace industry is currently addressing the problem of integrating manufacturing and design. To address the difficulties associated with using many conventional procedural techniques and algorithms, one feasible way to integrate the two concepts is with the development of an appropriate Knowledge-Based System (KBS). The authors present their reasons for selecting a KBS to integrate design and manufacturing. A methodology for an aircraft producibility assessment is proposed, utilizing a KBS for manufacturing process selection, that addresses both procedural and heuristic aspects of designing and manufacturing of a High Speed Civil Transport (HSCT) wing. A cost model is discussed that would allow system level trades utilizing information describing the material characteristics as well as the manufacturing process selections. Statements of future work conclude the paper.
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ItemIntegrated Product Development for the Wing Structural Design of the High Speed Civil Transport(Georgia Institute of Technology, 1994-09) Marx, William J. ; Mavris, Dimitri N. ; Schrage, Daniel P.The extent of knowledge required to perform the task of integrating manufacturing with aircraft design is beyond the expertise of a single engineer. This defines the need for a decision support system, or Knowledge-Based System, to aid the engineer in performing parallel product and process trades. This paper describes a research effort that includes development and integration of a manufacturing knowledge base and a rule-based reasoning system. NASA interests in the research discussed in this paper are directly related to their High Speed Research program. According to the program, NASA and this country's aerospace industry have undertaken the challenge of designing and building a 2 nd generation supersonic commercial transport by the early 21 st century. The proposed aircraft, called the High Speed Civil Transport, is envisioned to cruise at Mach 2.4 and carry 300 passengers to destinations in excess of 5,000 nautical miles. In addition, this aircraft must be economically viable and affordable, while being environmentally friendly and abiding by all appropriate FAR and EPA requirements. Integrated Product Development techniques aimed at assessing producibility can help designers perform the necessary trade-off studies to design the strongest, lightest possible structure at the least cost that meets the load-carrying requirement for a specified aircraft range. This concurrent design requires an integration of design with manufacturing and an optimization process that will consider design trade-offs related to product performance, producibility, and support. This integrated design and manufacturing approach can be used to develop low cost, producible structural design concepts. This approach involves encoding the knowledge of human experts concerning aircraft manufacturing and design into an appropriate representation. The seamless integration of a manufacturing Knowledge-Based System with aircraft preliminary design and analysis tools will yield a concurrent engineering system that will assist aerospace systems designers in performing parallel product and process design trades.
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ItemIntegrating Design and Manufacturing for the High Speed Civil Transport(Georgia Institute of Technology, 1994-09) Marx, William J. ; Mavris, Dimitri N. ; Schrage, Daniel P.The aerospace industry is currently addressing the problem of integrating design and manufacturing. Because of the difficulties associated with using conventional, procedural techniques and algorithms, it is the authors' belief that the only feasible way to integrate the two concepts is with the development of an appropriate Knowledge-Based System (KBS). The authors propose a methodology for an aircraft producibility assessment, including a KBS, that addresses both procedural and heuristic aspects of integrating design and manufacturing of a High Speed Civil Transport (HSCT) wing. The HSCT was chosen as the focus of this investigation since it is a current NASA/aerospace industry initiative full of technological challenges involving many disciplines. The paper gives a brief background of selected previous supersonic transport studies followed by descriptions of key relevant design and manufacturing methodologies. Georgia Tech's Concurrent Engineering / Integrated Product and Process Development methodology is discussed with reference to this proposed conceptual producibility assessment. Evaluation criteria are presented that relate pertinent product and process parameters to overall product producibility. In addition, the authors' integration methodology and reasons for selecting a KBS to integrate design and manufacturing are presented in this paper. Finally, a proposed KBS is given, as well as statements of future work and overall investigation objectives.