A Future View of Computational Science in Aircraft Engine Design
The accomplishments of LeRC in the field of computational fluid dynamics are presented.
Source record↗
SEARCH · Engineering Papers
Results for “Engineering Design”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Engineering design of sub-micron topographies for simultaneously adherent and reflective metal-polymer interfaces
The approach of the project is to base the design of multi-function, reflective topographies on the theory that topographically dependent phenomena react with surfaces and interfaces at certain scales. The first phase of the project emphasizes the development of methods for understanding the sizes of topographic features which influence reflectivity. Subsequent phases, if necessary, will address the scales of interaction for adhesion and manufacturing processes. A simulation of the interaction of electromagnetic radiation, or light, with a reflective surface is performed using specialized software. Reflectivity of the surface as a function of scale is evaluated and the results from the simulation are compared with reflectivity measurements made on multi-function, reflective surfaces.
Brown, Christopher A.↗
Engineering design of sub-micron topographies for simultaneously adherent and reflective metal-polymer interfaces
The approach of the project is to base the design of multi-function, reflective topographies on the theory that topographically dependent phenomena react with surfaces and interfaces at certain scales. The first phase of the project emphasizes the development of methods for understanding the sizes of topographic features which influence reflectivity. Subsequent phases, if necessary, will address the scales of interaction for adhesion and manufacturing processes. A simulation of the interaction of electromagnetic radiation, or light, with a reflective surface is performed using specialized software. Reflectivity of the surface as a function of scale is evaluated and the results from the simulation are compared with reflectivity measurements made on multi-function, reflective surfaces.
Brown, Christopher A.↗
Performance modeling & simulation of complex systems (A systems engineering design & analysis approach)
Modeling of the Multi-mission Image Processing System (MIPS) will be described as an example of the use of a modeling tool to design a distributed system that supports multiple application scenarios. This paper examines: (a) modeling tool selection, capabilities, and operation (namely NETWORK 2.5 by CACl), (b) pointers for building or constructing a model and how the MIPS model was developed, (c) the importance of benchmarking or testing the performance of equipment/subsystems being considered for incorporation the design/architecture, (d) the essential step of model validation and/or calibration using the benchmark results, (e) sample simulation results from the MIPS model, and (f) how modeling and simulation analysis affected the MIPS design process by having a supportive and informative impact.
Hall, Laverne↗
The development of the Final Approach Spacing Tool (FAST): A cooperative controller-engineer design approach
Historically, the development of advanced automation for air traffic control in the United States has excluded the input of the air traffic controller until the need of the development process. In contrast, the development of the Final Approach Spacing Tool (FAST), for the terminal area controller, has incorporated the end-user in early, iterative testing. This paper describes a cooperative between the controller and the developer to create a tool which incorporates the complexity of the air traffic controller's job. This approach to software development has enhanced the usability of FAST and has helped smooth the introduction of FAST into the operational environment.
Lee, Katharine K.↗
Systems Engineering Design Via Experimental Operation Research: Complex Organizational Metric for Programmatic Risk Environments (COMPRE)
Unique and innovative graph theory, neural network, organizational modeling, and genetic algorithms are applied to the design and evolution of programmatic and organizational architectures. Graph theory representations of programs and organizations increase modeling capabilities and flexibility, while illuminating preferable programmatic/organizational design features. Treating programs and organizations as neural networks results in better system synthesis, and more robust data modeling. Organizational modeling using covariance structures enhances the determination of organizational risk factors. Genetic algorithms improve programmatic evolution characteristics, while shedding light on rulebase requirements for achieving specified technological readiness levels, given budget and schedule resources. This program of research improves the robustness and verifiability of systems synthesis tools, including the Complex Organizational Metric for Programmatic Risk Environments (COMPRE).
Mog, Robert A.↗
Fundamentals of Digital Engineering: Designing for Reliability
The concept of designing for reliability will be introduced along with a brief overview of reliability, redundancy and traditional methods of fault tolerance is presented, as applied to current logic devices. The fundamentals of advanced circuit design and analysis techniques will be the primary focus. The introduction will cover the definitions of key device parameters and how analysis is used to prove circuit correctness. Basic design techniques such as synchronous vs asynchronous design, metastable state resolution time/arbiter design, and finite state machine structure/implementation will be reviewed. Advanced topics will be explored such as skew-tolerant circuit design, the use of triple-modular redundancy and circuit hazards, device transients and preventative circuit design, lock-up states in finite state machines generated by logic synthesizers, device transient characteristics, radiation mitigation techniques. worst-case analysis, the use of timing analyzer and simulators, and others. Case studies and lessons learned from spaceflight designs will be given as examples
Katz, R.↗
A Segmented Ion Engine Design for Solar Elctric Propulsion Systems
Solar electric xenon ion propulsion can be used to deliver a substantial quantity of science instruments in rendezvous missions to small bodies such as comets and main belt asteroids with an Atlas IIAS launch vehicle. The performance of the ion propulsion system enables it to deliver typically more than twice the total mass to the destination in less than half the trip time relative to a chemical/ballistic approach using the same launch vehicle.
electron bombardment↗
Validation of Multi-Dimensional Stirling Engine Design Codes: Measurements in the 90-Degree Turn Test Section
No abstract available
Simon, Terrence W.↗
NASA Lessons Learned Using High Level Architecture (HLA) in Engineering Design Analysis
No abstract available
Teare, David↗
The HAL 9000 Planning Engine Design and Operational Requirements
No abstract available
Stetson, Howard K.↗
Validation of Multi-Dimensional Stirling Engine Design Codes: Measurements in the 90-Degree Turn Test Section
This supplemental DVD contains data, code, figures, and files that were necessary for the generation of work described in NASA CR/2006-214131 (CASI ID 20060022139)
Simon, Terrence W.↗
Astrobee Systems Engineering Design Overview
The Astrobee preliminary design documents include subsystem design overview slides and a 3D model of the preliminary design of the Astrobee system including: mechanical, electrical, flight software, network, and ground subsystems.
Smith, Marion F.↗
The Hidden Dimensions of Architecture and Engineering Design
The art of going from a notional vision of a system to a fully realizable design is called “architecting.” For an architecture to be realizable over its lifetime, it has to conform to many demands. Not only does it need to conform to the vision and its ultimate purpose, it needs to adhere to a world of requirements: affordability, reliability, legality, operability, simplicity, analyzability, testability, understandability, accessibility, manufacturability, and repairability, among many others. Ultimately, the architectures that “hang together” in many or all of these dimensions evoke a sense of elegance and beauty. Please join us as Frank Gehry and JPLers Rob Manning and Raul Polit-Casillas discuss examples of design and architecture, and the importance of a well-thought-out design.
Gehry, Frank O.↗
Model-based engineering design for space missions
In this paper we will review the goals and status of MBED and show the expected interconnectivity between conceptual and detailed design.
Wall, Stephen D.↗
GPS Based Attitude Determination for Spacecraft: System Engineering Design Study and Ground Testbed Results
By differencing carrier phase measurements from multiple antennas, a global positioning systems (GPS) reciever can determine the attitude of a coordinate frame defined by the antenna baselines. This paper examines the potential role of such a capability within spacecraft avionics. The applications served by current GPS capabilities are identified. Architectural options are considered, and a baseline which satisfies the needs of most applications is defined. The majority of this paper then focuses on the prototyping of this baseline architecture within the Jet Propulsion Laboratory's (JPL's) Flight System Testbed (FST). The test setup is described, and test results are presented. The paper closes with an analysis of the limiting factors in the GPS based altitude determination error budget, a forecast of future capabilities, and a discussion of the advances that will be required to achieve those capabilities.
GPS↗