UH-60A Airloads Catalog
Author | : William G. Bousman |
Publisher | : |
Total Pages | : 220 |
Release | : 2005 |
Genre | : Aerodynamic load |
ISBN | : |
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Author | : William G. Bousman |
Publisher | : |
Total Pages | : 220 |
Release | : 2005 |
Genre | : Aerodynamic load |
ISBN | : |
Author | : Robert M. Kufeld |
Publisher | : |
Total Pages | : |
Release | : 1991 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 752 |
Release | : 1994 |
Genre | : Government publications |
ISBN | : |
Author | : Florentino Idosor |
Publisher | : |
Total Pages | : 212 |
Release | : 1993 |
Genre | : Helicopters |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 5 |
Release | : 1998 |
Genre | : |
ISBN | : |
A more accurate, neural-network-based characterization of the full-scale UH-60A maximum, vibratory pitch link loads (MXVPLL) was obtained. The MXVPLL data were taken from the NASA/Army UH-60A Airloads Program flight test database. This database includes data from level flights, and both simple and "complex" maneuvers. In the present context, a complex maneuver was defined as one which involved simultaneous, non-zero aircraft angle-of-bank (associated with turns) and aircraft pitch-rate (associated with a pull-up or a push-over). The present approach combines physical insight followed by the neural networks application. Since existing load factors do not represent the above-defined complex maneuver, a new, combined load factor ("present-load-factor") was introduced. A back-propagation type of neural network with five inputs and one output was used to characterize the UH-60A MXVPLL. The neural network inputs were as follows: rotor advance ratio, aircraft gross weight, rotor RPM, air density ratio, and the present-load-factor. The neural network output was the maximum, vibratory pitch link load (MXVPLL). It was shown that a more accurate characterization of the full-scale flight test pitch link loads can be obtained by combining physical insight with a neural-network-based approach.
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1994 |
Genre | : Government publications |
ISBN | : |
Author | : Thomas R. Norman |
Publisher | : BiblioGov |
Total Pages | : 22 |
Release | : 2013-06 |
Genre | : |
ISBN | : 9781289074388 |
The NASA Technical Reports Servcr (NTRS) houses half a million publications that are a valuable means of information to researchers, teachers, students, and the general public. These documents are all aerospace related with much scientific and technical information created or funded by NASA. Some types of documents include conference papers, research reports, meeting papers, journal articles and more. This is one of those documents.
Author | : Robert G. Ferguson |
Publisher | : |
Total Pages | : 312 |
Release | : 2013 |
Genre | : Aeronautics |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 26 |
Release | : 2000 |
Genre | : |
ISBN | : |
The lack of progress in understanding the physics of rotorcraft loads and vibration over the last 30 years is addressed in this paper. As befits this extraordinarily difficult problem, the reasons for the lack of progress are complicated and difficult to ascertain. It is proposed here that the difficulty lies within at least three areas: 1) a loss of perspective as to what are the key factors in rotor loads and vibration, 2) the overlooking of serious unsolved problems in the field, and 3) cultural barriers that impede progress. Some criteria are suggested for future research to provide a more concentrated focus on the problem.
Author | : |
Publisher | : |
Total Pages | : 538 |
Release | : 1991 |
Genre | : Aeronautics |
ISBN | : |