383 research outputs found
Enhanced emission prediction modeling and analysis for conceptual design
Issued as final reportUnited States. National Aeronautics and Space Administratio
Advanced Design Methodology for Robust Aircraft Sizing and Synthesis
Contract efforts are focused on refining the Robust Design Methodology for Conceptual Aircraft Design. Robust Design Simulation (RDS) was developed earlier as a potential solution to the need to do rapid trade-offs while accounting for risk, conflict, and uncertainty. The core of the simulation revolved around Response Surface Equations as approximations of bounded design spaces. An ongoing investigation is concerned with the advantages of using Neural Networks in conceptual design. Thought was also given to the development of systematic way to choose or create a baseline configuration based on specific mission requirements. Expert system was developed, which selects aerodynamics, performance and weights model from several configurations based on the user's mission requirements for subsonic civil transport. The research has also resulted in a step-by-step illustration on how to use the AMV method for distribution generation and the search for robust design solutions to multivariate constrained problems
Improved Aircraft Environmental Impact Segmentation via Metric Learning
Accurate modeling of aircraft environmental impact is pivotal to the design
of operational procedures and policies to mitigate negative aviation
environmental impact. Aircraft environmental impact segmentation is a process
which clusters aircraft types that have similar environmental impact
characteristics based on a set of aircraft features. This practice helps model
a large population of aircraft types with insufficient aircraft noise and
performance models and contributes to better understanding of aviation
environmental impact. Through measuring the similarity between aircraft types,
distance metric is the kernel of aircraft segmentation. Traditional ways of
aircraft segmentation use plain distance metrics and assign equal weight to all
features in an unsupervised clustering process. In this work, we utilize
weakly-supervised metric learning and partial information on aircraft fuel
burn, emissions, and noise to learn weighted distance metrics for aircraft
environmental impact segmentation. We show in a comprehensive case study that
the tailored distance metrics can indeed make aircraft segmentation better
reflect the actual environmental impact of aircraft. The metric learning
approach can help refine a number of similar data-driven analytical studies in
aviation.Comment: 32 pages, 11 figure
A Message Passing Strategy for Decentralized Connectivity Maintenance in Agent Removal
In a multi-agent system, agents coordinate to achieve global tasks through
local communications. Coordination usually requires sufficient information
flow, which is usually depicted by the connectivity of the communication
network. In a networked system, removal of some agents may cause a
disconnection. In order to maintain connectivity in agent removal, one can
design a robust network topology that tolerates a finite number of agent
losses, and/or develop a control strategy that recovers connectivity. This
paper proposes a decentralized control scheme based on a sequence of
replacements, each of which occurs between an agent and one of its immediate
neighbors. The replacements always end with an agent, whose relocation does not
cause a disconnection. We show that such an agent can be reached by a local
rule utilizing only some local information available in agents' immediate
neighborhoods. As such, the proposed message passing strategy guarantees the
connectivity maintenance in arbitrary agent removal. Furthermore, we
significantly improve the optimality of the proposed scheme by incorporating
-criticality (i.e. the criticality of an agent in its
-neighborhood).Comment: 9 pages, 9 figure
Simulating Corrective Maintenance: Aggregating Component Level Maintenance Time Uncertainty at the System Level
AbstractThe corrective maintenance process can be decomposed into failure and repair processes. Creating a model to capture the corrective maintenance process then requires an accurate estimate of the behavior of these constituent processes. For systems composed of many individual parts, information about failure and repair behavior is more likely to be available at the component level than the system level. Depending on the number of components that comprise the system, modeling each part may become computationally burdensome; in addition, some few components may account for a large portion of the overall system failures.In such a situation, one solution to the modeling burden is aggregation: the mathematical assimilation of many component distributions into a single representative distribution for the group. This paper describes how aggregation may be performed for such a system and how an algorithm may be developed to automate the process. Next, it describes how to simulate an aggregated distribution using a pseudo-random number generator and finally demonstrates these concepts for a sample problem. The first section of the paper introduces corrective maintenance modeling and aggregation; the second section describes aggregation for corrective maintenance; the third explains how to simulate the aggregated distribution; the fourth demonstrates aggregation; and the fifth discusses limitations of the method and concludes
Integrating Equity into Health Information Systems: A Human Rights Approach to Health and Information
Health information systems can play a crucial role in supporting human rights by documenting and tracking health and health inequities, and by creating a platform for action and accountabilit
Modal Filtering for Control of Flexible Aircraft
Modal regulators and deformation trackers are designed for an open-loop fluttering wing model. The regulators are designed with modal coordinate and accelerometer inputs respectively. The modal coordinates are estimated with simulated fiber optics. The robust stability of the closed-loop systems is compared in a structured singular-value vector analysis. Performance is evaluated and compared in a gust alleviation and flutter suppression simulation. For the same wing and flight condition two wing-shape-tracking control architectures are presented, which achieve deformation control at any point on the wing
Aircraft Conceptual Design and Risk Analysis Using Physics-Based Noise Prediction
An approach was developed which allows for design studies of commercial aircraft using physics-based noise analysis methods while retaining the ability to perform the rapid trade-off and risk analysis studies needed at the conceptual design stage. A prototype integrated analysis process was created for computing the total aircraft EPNL at the Federal Aviation Regulations Part 36 certification measurement locations using physics-based methods for fan rotor-stator interaction tones and jet mixing noise. The methodology was then used in combination with design of experiments to create response surface equations (RSEs) for the engine and aircraft performance metrics, geometric constraints and take-off and landing noise levels. In addition, Monte Carlo analysis was used to assess the expected variability of the metrics under the influence of uncertainty, and to determine how the variability is affected by the choice of engine cycle. Finally, the RSEs were used to conduct a series of proof-of-concept conceptual-level design studies demonstrating the utility of the approach. The study found that a key advantage to using physics-based analysis during conceptual design lies in the ability to assess the benefits of new technologies as a function of the design to which they are applied. The greatest difficulty in implementing physics-based analysis proved to be the generation of design geometry at a sufficient level of detail for high-fidelity analysis
A Multi-Fidelity Methodology for Reduced Order Models with High-Dimensional Inputs
In the early stages of aerospace design, reduced order models (ROMs) are
crucial for minimizing computational costs associated with using physics-rich
field information in many-query scenarios requiring multiple evaluations. The
intricacy of aerospace design demands the use of high-dimensional design spaces
to capture detailed features and design variability accurately. However, these
spaces introduce significant challenges, including the curse of dimensionality,
which stems from both high-dimensional inputs and outputs necessitating
substantial training data and computational effort. To address these
complexities, this study introduces a novel multi-fidelity, parametric, and
non-intrusive ROM framework designed for high-dimensional contexts. It
integrates machine learning techniques for manifold alignment and dimension
reduction employing Proper Orthogonal Decomposition (POD) and Model-based
Active Subspace with multi-fidelity regression for ROM construction. Our
approach is validated through two test cases: the 2D RAE~2822 airfoil and the
3D NASA CRM wing, assessing combinations of various fidelity levels, training
data ratios, and sample sizes. Compared to the single-fidelity PCAS method, our
multi-fidelity solution offers improved cost-accuracy benefits and achieves
better predictive accuracy with reduced computational demands. Moreover, our
methodology outperforms the manifold-aligned ROM (MA-ROM) method by 50% in
handling scenarios with large input dimensions, underscoring its efficacy in
addressing the complex challenges of aerospace design
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