WorldCat Identities

United States Army Aviation Systems Command

Works: 338 works in 445 publications in 1 language and 16,263 library holdings
Genres: History  Periodicals  Newspapers 
Classifications: TL521.3, 956.7044
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Most widely held works about United States
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Most widely held works by United States
Implementation of an intelligent control system by Donald L Simon( )

3 editions published in 1992 in English and held by 232 WorldCat member libraries worldwide

A laboratory testbed facility which has been constructed at the NASA Lewis Research Center for the development of an Intelligent Control System (ICS) for reusable rocket engines is described. The framework of the ICS consists of a hierarchy of various control and diagnostic functions. The traditional high speed, closed-loop controller resides at the lowest level of the ICS hierarchy. Above this level resides the diagnostic functions which identify engine faults. The ICS top level consists of the coordination function which manages the interaction between an expert system and a traditional control system. The purpose of the testbed is to demonstrate the feasibility of the ICS concept by implementing the ICS as the primary controller in a simulation of the Space Shuttle Main Engine (SSME)
Determination of real machine-tool settings and minimization of real surface deviation by computerized inspection by F. L Litvin( Book )

2 editions published in 1991 in English and held by 230 WorldCat member libraries worldwide

A numerical method is developed for the minimization of deviations of real tooth surfaces from the theoretical ones. The deviations are caused by errors of manufacturing, errors of installment of machine-tool settings and distortion of surfaces by heat-treatment. The deviations are determined by coordinate measurements of gear tooth surfaces. The minimization of deviations is based on the proper correction of initially applied machine-tool settings. The contents of accomplished research project cover the following topics: (1) Description of the principle of coordinate measurements of gear tooth surfaces; (2) Derivation of theoretical tooth surfaces (with examples of surfaces of hypoid gears and references for spiral bevel gears); (3) Determination of the reference point and the grid; (4) Determination of deviations of real tooth surfaces at the points of the grid; and (5) Determination of required corrections of machine-tool settings for minimization of deviations
Determination of depth-viewing volumes for stereo three-dimensional graphic displays by Russell V Parrish( Book )

3 editions published in 1990 in English and held by 148 WorldCat member libraries worldwide

Three-dimensional (real-world) pictorial displays incorporating true depth cures via stereopsis techniques offer a potential means of displaying complex information in a natural way to prevent loss of situational awareness and provide increases in pilot/vehicle performance in advanced flight display concepts. Optimal use of stereopsis cueing requires an understanding of the depth-viewing volume available to the display designer. This report presents suggested guidelines for the depth-viewing volume from a empirical determination of the effective region of the stereopsis cueing (at several distances between the viewer and the cathode ray tube (CRT) screen) for a time-multiplexed stereopsis display system. The results provide the display designer with information that will allow more effective placement of depth information to enable the full exploitation of stereopsis cueing. Additionally, the data revealed the fact that increasing the viewer-CRT screen distances provides increasing amount of usable depth but decreases the field of view. A stereopsis hardware system that permits an increased viewer-screen distance by incorporating larger screen sizes or collimation optics to maintain the field of view at required levels would provide a much larger stereo depth-viewing volume
Computer code for predicting coolant flow and heat transfer in turbomachinery by Peter L Meitner( Book )

3 editions published in 1990 in English and held by 147 WorldCat member libraries worldwide

A data acquisition and control program for axial-torsional fatigue testing by Sreeramesh Kalluri( )

3 editions published in 1989 in English and held by 146 WorldCat member libraries worldwide

A computer program was developed for data acquisition and control of axial -torsional fatigue experiments. The mult-tasked, interrupt-driven program is capable of dual-channel control and six-channel data acquisition. It can be utilized to perform inphase and out-of-phase axial-torsional isothermal fatigue or deformation experiments. The program was successfully used to conduct inphase axial torsional fatigue experiments on 304 stainless steel at room temperature and on Hastelloy X 800 C. This paper describes the details of the software and gives some of the results generated to date. Failure of engineering components due to fatigue is a common occurrence in the aerospace and automotive industries. It is therefore necessary to characterize the fatigue behavior of materials so that the engineering components can be operated safely and reliably
Stereopsis cueing effects on hover-in-turbulence performance in a simulated rotorcraft by Russell V Parrish( Book )

4 editions published in 1990 in English and held by 144 WorldCat member libraries worldwide

Behavior of composite/metal aircraft structural elements and components under crash type loads : what are they telling us? by Huey D Carden( Book )

1 edition published in 1990 in English and held by 139 WorldCat member libraries worldwide

Failure behavior results are presented from crash dynamics research using concepts of aircraft elements and substructure not necessarily designed or optimized for energy absorption or crash loading considerations. To achieve desired new designs which incorporate improved energy absorption capabilities often requires an understanding of how more conventional designs behave under crash loadings. Experimental and analytical data are presented which indicate some general trends in the failure behavior of a class of composite structures which include individual fuselage frames, skeleton subfloors with stringers and floor beams but without skin covering, and subfloors with skin added to the frame-stringer arrangement. Although the behavior is complex, a strong similarity in the static/dynamic failure behavior among these structures is illustrated through photographs of the experimental results and through analytical data of generic composite structural models. It is believed that the similarity in behavior is giving the designer and dynamists much information about what to expect in the crash behavior of these structures and can guide designs for improving the energy absorption and crash behavior of such structures
A basis for solid modeling of gear teeth with application in design and manufacture( Book )

1 edition published in 1992 in English and held by 138 WorldCat member libraries worldwide

This paper discusses a new approach to modeling gear tooth surfaces. A computer graphics solid modeling procedure is used to simulate the tooth fabrication processes. This procedure is based on the principles of differential geometry that pertain to envelopes of curves and surfaces. The procedure is illustrated with the modeling of spur, helical, bevel, spiral bevel, and hypoid gear teeth. Applications in design and manufacturing are discussed. Extensions to nonstandard tooth forms, to cams, and to rolling element bearings are proposed
An incremental strategy for calculating consistent discrete CFD sensitivity derivatives( Book )

1 edition published in 1992 in English and held by 138 WorldCat member libraries worldwide

In this preliminary study involving advanced CFD codes, an incremental formulation, also known as the delta or 'correction' form, is presented for solving the very large sparse systems of linear equations which are associated with aerodynamic sensitivity analysis. For typical problems in 2D, a direct solution method can be applied to these linear equations in either the standard or the incremental form, in which case the two are equivalent. Rerative methods appear to be needed for future 3D applications, however, where direct solver methods require much more computer memory than is currently available. Iterative methods for solving these equations in the standard form result in certain difficulties, such as ill-conditioning of the coefficient matrices, which can be overcome when these equations are cast in the incremental form; these and other benefits are discussed herein. The methodology is successfully implemented and tested in 2D using an upwind, cell-centered, finite volume formulation applied to the thin-layer Navier-Stokes equations. Results are presented for two laminar sample problems: (1) transonic flow through a double-throat nozzle, and (2) flow over an isolated airfoil
Mechanical property characterization and impact resistance of selected graphite/PEEK composite materials by Donald J Baker( Book )

1 edition published in 1991 in English and held by 137 WorldCat member libraries worldwide

Computerized inspection of gear tooth surfaces( Book )

1 edition published in 1989 in English and held by 135 WorldCat member libraries worldwide

Observations on computational methodologies for use in large-scale, gradient-based, multidisciplinary design incorporating advanced CFD codes( Book )

1 edition published in 1992 in English and held by 134 WorldCat member libraries worldwide

Wind-tunnel evaluation of a 21-percent-scale powered model of a prototype advanced scout helicopter by Arthur E Phelps( )

2 editions published in 1985 in English and held by 132 WorldCat member libraries worldwide

Differential equation based method for accurate approximations in optimization by Jocelyn I Pritchard( Book )

1 edition published in 1990 in English and held by 130 WorldCat member libraries worldwide

Surface pitting fatigue life of noninvolute, low-contact-ratio gears by Dennis P Townsend( Book )

1 edition published in 1990 in English and held by 129 WorldCat member libraries worldwide

Influence of linear profile modification and loading conditions on the dynamic tooth load and stress of high contact ration gears( Book )

1 edition published in 1990 in English and held by 129 WorldCat member libraries worldwide

This paper presents a computer simulation for the dynamic response of high-contact-ratio spur gear transmissions. High contact-ratio spur gear transmissions. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented in this paper examines various profile modifications under realistic loading conditions. The effect of these modifications on the dynamic load (force) between mating gear teeth and the dynamic root stress is presented. Since the contact stress is dependent on the dynamic load, minimizing dynamic loads will also minimize contact stresses. This paper shows that the combination of profile modification and the applied load (torque) carried by a gear system has a significant influence on gear dynamics. The ideal modification at one value of applied load will not be the best solution for a different load. High-contact-ratio gears were found to require less modification than standard low-contact-ratio gears
Combined effect of matrix cracking and stress-free edge on delamination by Satish A Salpekar( Book )

1 edition published in 1990 in English and held by 128 WorldCat member libraries worldwide

Computer simulation of gear tooth manufacturing processes by Dimitri Mavriplis( Book )

1 edition published in 1990 in English and held by 128 WorldCat member libraries worldwide

This report discusses the use of computer graphics to simulate gear tooth manufacturing procedures. An analytical basis for the simulation is established for spur gears. The simulation itself, however, is developed not only for spur gears, but for straight bevel gears as well. The applications of the developed procedure extend from the development of finite elements models of heretofore intractable geometrical forms, to exploring the fabrication of nonstandard tooth forms. (kr)
NACA 0015 wing pressure and trailing vortex measurements by Kenneth W McAlister( Book )

1 edition published in 1991 in English and held by 127 WorldCat member libraries worldwide

Description of the U.S. Army small-scale 2-meter rotor test system by Arthur E Phelps( Book )

1 edition published in 1987 in English and held by 126 WorldCat member libraries worldwide

A small scale powered rotor model was designed for use as a research tool in the exploratory testing of rotors and helicopter models. The model, which consists of a 29 hp rotor drive system, a four blade fully articulated rotor, and a fuselage, was designed to be simple to operate and maintain in wind tunnels of moderate size and complexity. Two six-component strain-gauge balances are used to provide independent measurement of the rotor and fuselage aerodynamic loads. Commercially available standardized hardware and equipment were used to the maximum extent possible, and specialized parts were design so that they could be fabricated by normal methods without using highly specialized tooling. The model was used in a hover test of three rotors having different planforms and in a forward flight investigation of a 21 percent scale model of a U.S. Army scout helicopter equipped with a mast mounted sight. Keywords: Rotor model; Hover testing; Rotor scaling
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Alternative Names

controlled identityU.S. Army Aviation and Troop Command

Army Aviation Systems Command


United States Army Army Aviation Systems Command

United States. Army. Aviation Systems Command

United States US Army Aviation Systems Command

US Army Aviation Systems Command


English (64)