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Aerospace Engineering Commons

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Full-Text Articles in Aerospace Engineering

Who Cares About Director Independence? Presentation (Pdf Format), Paolo Santella, Carlo Drago, Giulia Paone May 2007

Who Cares About Director Independence? Presentation (Pdf Format), Paolo Santella, Carlo Drago, Giulia Paone

Carlo Drago

No abstract provided.


The Role Of Error In The Conceptual Design Of A Transport Aircraft, Robert A. Mcdonald Jan 2007

The Role Of Error In The Conceptual Design Of A Transport Aircraft, Robert A. Mcdonald

Robert A. McDonald

A fidelity trade environment was demonstrated by using it to simulate a decision making process for a transport aircraft. This scenario was not possible without the fidelity trade environment. The role of system feedback and coupling in error stability was also investigated.
A sensitivity approach which relies on the system sensitivity matrix was used to rapidly approximate the propagation of error through the complex system. In verification tests, the sensitivity approach provided approximate results substantially similar to a Monte Carlo approach that was many orders of magnitude more expensive. The rapid sensitivity approach to modeling error propagation enabled the responsive …


Forest Products Laboratory: Supporting The Nation's Armed Forces With Valuable Wood Research For 90 Years, Christopher D. Risbrudt, Robert J. Ross, Julie J. Blankenburg, Charles A. Nelson Jan 2007

Forest Products Laboratory: Supporting The Nation's Armed Forces With Valuable Wood Research For 90 Years, Christopher D. Risbrudt, Robert J. Ross, Julie J. Blankenburg, Charles A. Nelson

Julie Blankenburg

Founded in 1910 by the U.S. Forest Service to serve as a centralized, national wood research laboratory, the USDA Forest Products Laboratory (FPL) has a long history of providing technical services to other government agencies, including those within the Department of Defense (DoD). A recent search of FPL’s library and correspondence files revealed that approximately 10,000 articles, reports, manuals, other technical publications, and communications have been generated and provided to the DoD since 1910. FPL has provided support on a broad array of technical questions—from designporting materiel to Europe and the South Pacific during World War II to assisting in …


Plastic Flow Under Compression And Shear In Rotational Diamond Anvil Cell: Finite-Element Study, Valery I. Levitas, Oleg M. Zarechnyy Jan 2007

Plastic Flow Under Compression And Shear In Rotational Diamond Anvil Cell: Finite-Element Study, Valery I. Levitas, Oleg M. Zarechnyy

Valery I. Levitas

Plastic flow and the evolution of distribution of the components of stress tensor in a sample under compression and shear in rotational diamond anvil cell are studied using the finite-element method(FEM).Pressure self-multiplication effect is revealed during rotation of an anvil after compression below critical force. Significant heterogeneity of accumulated plastic strain (especially near contact surface with diamond) is found. The obtained results are important for determination and interpretation of kinetics of strain-induced phase transformations (PTs) and chemical reactions.