Organizational Unit:

Aerospace Systems Design Laboratory (ASDL)

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https://hdl.handle.net/1853/70744

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Organizational Unit

Daniel Guggenheim School of Aerospace Engineering

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https://finding-aids.library.gatech.edu/agents/corporate_entities/1135

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Publication Search Results

Now showing 1 - 10 of 13

The Implementation of a Conceptual Aerospace Systems Design and Analysis Toolkit

(Georgia Institute of Technology, 1999-10) Hale, Mark A. ; Mavris, Dimitri N. ; Carter, Dennis L.

The Conceptual Aerospace Systems Design and Analysis Toolkit (CASDAT) provides a baseline assessment capability for the Air Force Research Laboratory. The historical development of CASDAT is of benefit to the design research community because considerable effort was expended in the classification of the analysis tools. Its implementation proves to also be of importance because of the definition of assessment use cases. As a result, CASDAT is compatible with accepted analysis tools and can be used with state-of-the- art assessment methods, including technology forecasting and probabilistic design.
Elements of an Emerging Virtual Stochastic life Cycle Design Environment

(Georgia Institute of Technology, 1999-10) Mavris, Dimitri N. ; DeLaurentis, Daniel A. ; Hale, Mark A. ; Tai, Jimmy C. M.

The challenge of designing next-generation systems that meet goals for system effectiveness, environmental compatibility, and cost has grown to the point that traditional design methodologies are becoming ineffective. Increases in the analysis complexity required, the number of objectives and constraints to be evaluated, and the multitude of uncertainties in today? design problems are primary drivers of this situation. A new environment for design has been formulated to treat this situation. It is viewed as a testbed, in which new techniques in such areas as design-oriented/physics-based analysis, uncertainty modeling, technology forecasting, system synthesis, and decision-making can be posed as hypotheses. Several recent advances in elements of this multidisciplinary environment, termed the Virtual Stochastic Life Cycle Design Environment, are summarized in this paper.
Enabling Advanced Design Methods in an Internet-Capable Framework

(Georgia Institute of Technology, 1999-10) Hale, Mark A. ; Mavris, Dimitri N.

The enabling of advanced design methods in an internet-capable framework will be discussed in this paper. The resulting framework represents the next generation of design and analysis capability in which engineering decision-making can be done by geographically distributed team members. A new internet technology called the lean-server approach is introduced as a mechanism for granting Web browser access to frameworks and domain analyses. This approach has the underpinnings required to support these next generation frameworks collaboratories. A historical perspective of design frameworks is discussed to provide an understanding of the design functionality that is expected from framework implementations to insure design technology advancement. Two research areas were identified as being important to the development of collaboratories: design portals and collaborative methods. An internet-enabled design framework called IMAGE is highlighted and demonstrated using a probabilistic design example. The prototyped methods have found their way into a Conceptual Aerospace Systems Design and Analysis Toolkit used by the Air Force Research Laboratory.
A Lean-Server Approach to Enabling Collaboration Using Advanced Design Methods

(Georgia Institute of Technology, 1999-09) Hale, Mark A. ; Craig, James I. ; Mavris, Dimitri N.

The design framework research community utilizes the internet as a facilitator for collaborative activities. The internet provides a platform independent interface and geographic distribution. Information can be easily represented to the end-user using the HyperText Markup Language and can be coded in a reasonable timeframe. A shortcoming of exploiting this technology further is the reliance on existing Web servers to interface with analysis tools and design services. In this case, interactive components require auxiliary processes (called CGI scripts) to be started by the server that are used in an inefficient manner. This model does not provide the user-oriented capability required by standalone applications. Java offers improvements in client-side processing but a server bottleneck still exists. A novel approach using lean-servers is introduced as an alternative method for providing an efficient server-side computing model. In this case, internet requests are brokered directly by the design application by providing a gateway to the application? programming interface using a HyperText Transfer Protocol compliant layer. This allows requests to be managed directly by the application rather than requiring auxiliary services. Step-by-step directions for implementing this approach using a case study of an existing design framework are given in this paper. A prototype system, called the Systems Programming Architecture for Collaborative Engineering, is described as one scenario for implementing the lean-server technology. Usability of the approach is demonstrated through a Design of Experiments example that is representative of modern design methods. This example also demonstrates collaboration because it executes asynchronously with multi-user intervention at any time during the process. In hindsight, the lean-server approach is an enabling technology for collaborative design and focuses future research direction on the establishment of collaborative design practices.
Conceptual Aircraft Design Environment: Case Study Evaluation of Computing Architecture Technologies

(Georgia Institute of Technology, 1998-09) Tejtel, Daniel ; Mavris, Dimitri N. ; Hale, Mark A.

Designers need to use a variety of different codes in order to solve today's complex design problems; codes which must all be made to work together. Tools can be developed which facilitate the integration of these varied codes, so that they can be used together to solve a single problem. Using a computational architecture, a procedure has been set up which allows for a complete aerodynamic analysis of a High Speed Civil Transport. The computer architecture serves as a framework within which any number of diverse codes can be linked; data can be exchanged, stored, and otherwise managed; and decisions regarding the design of a vehicle can be made. The use of a computational tool called a Process Element as the method of code implementation allows for the basic analysis procedure to be easily modified and added to and to be used with higher-level, probabilistic-based design methods. By means of the High Speed Civil Transport aerodynamic analysis example problem described in this paper, the key features of the computational architecture, as well as its capabilities and limitations, are examined and evaluated.
A Stochastic Approach to Multi-disciplinary Aircraft Analysis and Design

(Georgia Institute of Technology, 1998-01) Mavris, Dimitri N. ; DeLaurentis, Daniel A. ; Bandte, Oliver ; Hale, Mark A.

Within the context of multi-disciplinary aircraft analysis and design, a new approach has been formulated and described which allows for the rapid technical feasibility and economic viability assessment of multi- attribute, multi-constrained designs. The approach, referred to here as Virtual Stochastic Life Cycle Design, facilitates the multi-disciplinary consideration of a system, accounting for life-cycle issues in a stochastic fashion. The life-cycle consideration is deemed essential in order to evaluate the emerging, all encompassing system objective of affordability. The stochastic treatment is employed to account for the knowledge variation/uncertainty that occurs in time through the various phases of design. Variability found in the treatment of assumptions, ambiguous requirements, code fidelity (imprecision), economic uncertainty, and technological risk are all examples of categories of uncertainty that the proposed probabilistic approach can assess. For cases where the problem is over-constrained and a feasible solution is not possible, the proposed method facilitates the identification and provides guidance in the determination of potential barriers which will have to be overcome via the infusion of new technologies. The specific task of examining system feasibility and viability is encapsulated and outlined in a series of easy to follow steps. Finally, the method concludes with a brief description and discussion of proposed decision making techniques to achieve optimal designs with reduced variability. This decision making is achieved through a combined utility theory and Robust Design Simulation approach.
Techniques for Integrating Computer Programs into Design Architectures

(Georgia Institute of Technology, 1996-09) Hale, Mark A. ; Craig, James I.

The benefits of using modular computer architectures for multi-disciplinary design are being explored by industry, government, and academia. These architectures are being validated through a considerable number of in-house and team demonstration projects. Based on experiences to date, a generic computing design architecture consists of the following components: process management, a common product data model, an analysis toolkit, a problem-independent computing backplane, and integration mechanisms. The latter is concerned with the addition of services to computer resources in an analysis toolkit, called wrapping, and is discussed in this paper. Wrapping allows for the collaborative use of resources within a computer architecture. Strategies and consequences of integrating resources from executables to source code are outlined. Benefits associated with using software agents to assist designers in integrating and using software resources in design computing architectures are highlighted.
DREAMS and IMAGE: A Model and Computer Implementation for Concurrent, Life-Cycle Design of Complex Systems

(Georgia Institute of Technology, 1996-06) Hale, Mark A. ; Craig, James I. ; Mistree, Farrokh ; Schrage, Daniel P.

Computing architectures are being assembled that extend concurrent engineering practices by providing more efficient execution and collaboration on distributed, heterogeneous computing networks. Built on the successes of initial architectures, requirements for a next-generation design computing infrastructure can be developed. These requirements concentrate on those needed by a designer in decision-making processes from product conception to recycling and can be categorized in two areas: design process and design information management. A designer both designs and executes design processes throughout design time to achieve better product and process capabilities while expending fewer resources. In order to accomplish this, information, or more appropriately design knowledge, needs to be adequately managed during product and process decomposition as well as recomposition. A foundation has been laid that captures these requirements in a design architecture called DREAMS (Developing Robust Engineering Analysis Models and Specifications). In addition, a computing infrastructure, called IMAGE (Intelligent Multidisciplinary Aircraft Generation Environment), is being developed that satisfies design requirements defined in DREAMS and incorporates enabling computational technologies.
On the Development of a Computing Infrastructure that Facilitates IPPD from a Decision-Based Perspective

(Georgia Institute of Technology, 1995-09) Hale, Mark A. ; Craig, James I. ; Mistree, Farrokh ; Schrage, Daniel P.

Integrated Product and Process Development (IPPD) embodies the simultaneous application of both system and quality engineering methods throughout iterative design processes. The use of IPPD results in the time-conscious, cost-saving development of engineering systems. A computing infrastructure called IMAGE is designed to implement IPPD from a decision-based perspective. IMAGE has four components: designer activities, available assets, agent collaboration, and a computing architecture. IMAGE captures a designer's activities through a timeline partitioning scheme, problem formulation and solution, and comprehensive information management. To support these activities, IMAGE incorporates design resources through the use of agents. Agents are a critical computational enabling technology that provide accountable mechanisms for resource collaboration in an integrated computing environment.
Implementing an IPPD Environment from a Decision-Based Design Perspective

(Georgia Institute of Technology, 1995-05) Hale, Mark A. ; Schrage, Daniel P. ; Mistree, Farrokh ; Craig, James I.

Integrated Product and Process Development (IPPD) embodies the simultaneous application of both system and quality engineering methods throughout an iterative design process. The use of IPPD results in the time-conscious, cost-saving development of engineering systems. Georgia Tech has proposed the development of an Integrated Design Engineering Simulator that will merge Integrated Product and Process Development with interdisciplinary analysis techniques and state-of-the-art computational technologies. To implement IPPD, a Decision-Based Design perspective is encapsulated in an approach that focuses on the role of the human designer in product development. The approach has two parts and is outlined in this paper. First, an architecture, called DREAMS, is being developed that facilitates design from a decision-based perspective. Second, a supporting computing infrastructure, called IMAGE, is being designed. The current status of development is given and future directions are outlined.