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Air Force Institute of Technology

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High Discharge Rate Characteristics Of Nickel-Cadmium Batteries For Pulse Load Filtering, Gregory M. Gearing, Michael B. Cimino, David H. Fritts, John F. Leonard, Anthony J. Terzuoli Jr. Jul 1985

High Discharge Rate Characteristics Of Nickel-Cadmium Batteries For Pulse Load Filtering, Gregory M. Gearing, Michael B. Cimino, David H. Fritts, John F. Leonard, Anthony J. Terzuoli Jr.

Faculty Publications

Several tests of specially fabricated nickel-cadmium batteries having circular disk type electrodes were considered. These batteries were evaluated as filter elements between a constant current power supply and a five hertz pulsed load demanding approximately twice the power supply current during the load on portion of the cycle. Short tests lasting 10,000 cycles were conducted at up to a 21 C rate and an equivalent energy density of over 40 Joules per pound. In addition, two batteries were subjected to 107 charge/discharge cycles, one at a 6.5 C rate and the other at a 13 C rate. Assuming an …

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Study Of Longitudinal Landing Flying Qualities Evaluation Using Pilot Model Theory, Eric D. Didomenico Dec 1984

Study Of Longitudinal Landing Flying Qualities Evaluation Using Pilot Model Theory, Eric D. Didomenico

Theses and Dissertations

Control Anticipation Parameter (CAP), used in MIL-SPEC-8785C as a longitudinal handling qualities criterion does not adequately distinguish between different flight phases. Recent flight test data from the Landing Approach Higher Order Systems (LAHOS) study further indicate the inadequacy of the second order approximations for higher order longitudinal landing flying qualities. Nine Aircraft that fall within the Level 1 boundary reveal pilot ratings ranging from 1.5 to 10 (Cooper/Harper). These nine aircraft are studied by combining their longitudinal dynamics with pilot modelling to examine a better method of landing flying quality prediction and evaluation. Pilot model theory (cross-over pilot model) is …

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Solution To Eigenvalue Problems Of Antisymmetric Cross-Ply And Antisymmetric Angle-Ply Laminated Plates Using Affine Transformations, Zaffir A. Chaudry Dec 1984

Solution To Eigenvalue Problems Of Antisymmetric Cross-Ply And Antisymmetric Angle-Ply Laminated Plates Using Affine Transformations, Zaffir A. Chaudry

Theses and Dissertations

Using affine transformations and suitably recasting the buckling vibration differential equations, the eigenvalue problem of anti-symmetric cross-ply and antisymmetric angle-ply laminated rectangular plates has been reduced to a function of two strong material constants, the generalized rigidity ratio, whose range is in the closed interval from 0 to 1, and the ratio of principal lamina stiffness. With the reduction in number of constants an exhaustive parameter study of buckling and vibration solution trends, is possible. The buckling coefficients decrease with decreasing value of generalized rigidity ratio for both antisymmetric cross-ply and antisymmetric angle-ply laminates. For a given aspect ratio, and …

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Planning For The On-Orbit Servicing Of Military Spacecraft, Michael E. Russell, Robert M. Tayloe Sep 1984

Planning For The On-Orbit Servicing Of Military Spacecraft, Michael E. Russell, Robert M. Tayloe

Theses and Dissertations

On-orbit spacecraft servicing for military programs is examined. The military community appears to be somewhat reticent to embrace or, in some cases, to even consider on-orbit servicing. The civilian community appears enthusiastic about the potential of on-orbit servicing and the majority of economic studies of civilian missions show servicing strategies to be an attractive alternative to most expendable spacecraft strategies. A model called SATSERV is presented. This model can be used to conduct economic comparisons from an overall standpoint between expendable and servicing strategies. The model is implemented in a microcomputer spreadsheet format for rapid implementation and application along with …

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Measurement Of Air Force Fire Department Productivity: An Evaluation Of Efficiency/Effectiveness, Timothy A. Byers, Susanne M. Waylette Sep 1984

Measurement Of Air Force Fire Department Productivity: An Evaluation Of Efficiency/Effectiveness, Timothy A. Byers, Susanne M. Waylette

Theses and Dissertations

This research was sponsored to develop a method of evaluating the productivity of Air Force Fire Departments. Using the tasks developed by the Fire Department Workshop, input and output measures were defined and used in a new model of efficiency called Constrained Facet Analysis (CFA). The advantage of this methodology over others considered was that it can simultaneously evaluate multiple inputs and multiple outputs using empirical data with no a priori weighting. The results of the analysis provided an efficiency rating for each fire department and information about marginal rates of substitution and marginal rates of productivity for inefficient units …

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Axisymmetric Thrust Augmenting Ejector With Discrete Primary Air Slot Nozzles, Steven G. Reznick, Milton E. Franke May 1984

Axisymmetric Thrust Augmenting Ejector With Discrete Primary Air Slot Nozzles, Steven G. Reznick, Milton E. Franke

AFIT Patents

A circular thrust augmenting ejector has an annular wall which defines a central passageway and a convergent contoured inlet section, a constant area cylindrical mixing section and a divergent conical diffuser outlet section. The inlet, mixing and outlet sections merge one into the next in axisymmetric serial relationship. The ejector also has a plurality of discrete primary nozzles arranged about the periphery of the annular wall at the entrance to the inlet section thereof for injecting a primary flow of high velocity air into the inlet section and thereby entraining a secondary flow of ambient air into the central passageway …

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Air Force Institute Of Technology 1919 – 1984. 65Th Anniversary [Commemorative Brochure], Air Force Institute Of Technology Jan 1984

Air Force Institute Of Technology 1919 – 1984. 65Th Anniversary [Commemorative Brochure], Air Force Institute Of Technology

AFIT Documents

No abstract provided.

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Stochastic Estimation Applied To The Land Speed Of Sound Record Attempt By A Rocket Car, David A. Reinholz Dec 1983

Stochastic Estimation Applied To The Land Speed Of Sound Record Attempt By A Rocket Car, David A. Reinholz

Theses and Dissertations

Optimal linear smoothing theory is applied to the data from the Speed of Sound record attempt of a three-wheeled rocket car on 17 December 1979. A forward-backward estimation method is used which employs a seven state forward-running extended Kalman filter and a Meditch-form backward recursive 'fixed-interval' smoothing algorithm. Data for this analysis is supplied by a longitudinal accelerometer mounted on the vehicle and tracking radar measurements of range, azimuth, and elevation. States of interest include two components of vehicle position and velocity, accelerometer time-correlated error, and radar range and azimuth bias errors. Two iterations of the forward-backward smoothing algorithm provide …

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Modal Control Of An Unstable Periodic Orbit, William Wiesel, William Shelton Jan 1983

Modal Control Of An Unstable Periodic Orbit, William Wiesel, William Shelton

Faculty Publications

We apply Floquet theory to the problem of designing a control system for a satellite in an unstable periodic orbit. Expansion about a periodic orbit produces a time periodic linear system, which is augmented by a time periodic control term. We show that this can be done such that a) the application of control produces only inertial accelerations, b) positive real Poincare exponents are shifted into the left half-plane, and c) the shift of the exponent is linear with control gain. We apply these developments to an unstable orbit near the Earth-Moon L3 point perturbed by the Sun. Finally, …

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Air Force Institute Of Technology Contributions To Air Force Research And Development, Calendar Year 1979, Air Force Institute Of Technology Feb 1980

Air Force Institute Of Technology Contributions To Air Force Research And Development, Calendar Year 1979, Air Force Institute Of Technology

AFIT Documents

This report provides the listing of the Master of Science Theses, Doctoral dissertations, faculty consultations, and selected faculty publications completed during the 1979 calendar year at the Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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Air Force Institute Of Technology Contributions To Air Force Research And Development, Calendar Year 1978, Air Force Institute Of Technology Jul 1979

Air Force Institute Of Technology Contributions To Air Force Research And Development, Calendar Year 1978, Air Force Institute Of Technology

AFIT Documents

This report contains the listings of Master of Science Theses, Doctoral dissertations, Faculty consultations, and selected faculty publications completed during the 1978 calendar year at the Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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Air Force Institute Of Technology School Of Engineering. Contributions To Air Force Research And Development, Calendar Year 1977, School Of Engineering, Air Force Institute Of Technology Dec 1978

Air Force Institute Of Technology School Of Engineering. Contributions To Air Force Research And Development, Calendar Year 1977, School Of Engineering, Air Force Institute Of Technology

AFIT Documents

This report contains abstracts of Master of Science Theses, Doctoral dissertations, and selected faculty publications completed during the 1977 calendar year at the School of Engineering, Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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A Study Of A Wind Tunnel Measurement System For Unsteady Pressures Using Pneumatic Transmission Lines, Mohammed Javed Khan Dec 1978

A Study Of A Wind Tunnel Measurement System For Unsteady Pressures Using Pneumatic Transmission Lines, Mohammed Javed Khan

Theses and Dissertations

The application of pneumatic transmission lines theory to a tube-scanning valve system for unsteady pressure measurements in the AFIT 5-foot wind tunnel is investigated. Transfer gains of various tube-scanning valve configurations were experimentally measured and the validity of a theoretical model verified for a frequency range of 20 Hz to 140 Hz. The selected system having a 0.0625-in. ID flexible tube of 84 in. length connected to a scanning valve was installed in the wind tunnel. Unsteady pressures introduced over an 18 percent airfoil at zero angle of attack were measured with this system. Data were collected for 0, 40, …

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Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1976, School Of Engineering, Air Force Institute Of Technology Jan 1977

Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1976, School Of Engineering, Air Force Institute Of Technology

AFIT Documents

This report contains abstracts of Master of Science Theses, Doctoral dissertations, and selected faculty publications completed during the 1976 calendar year at the School of Engineering, Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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Afit School Of Engineering Contributions To Air Force Research And Technology Calendar Year 1973, School Of Engineering, Air Force Institute Of Technology Oct 1974

Afit School Of Engineering Contributions To Air Force Research And Technology Calendar Year 1973, School Of Engineering, Air Force Institute Of Technology

AFIT Documents

This report contains abstracts of Master of Science Theses, Doctoral dissertations, and selected faculty publications completed during the 1973 calendar year at the School of Engineering, Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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Faa/Dod Liaison In Management Of The National Aviation System, Ronald S. Brooks, Jerry L. Beatty Sep 1974

Faa/Dod Liaison In Management Of The National Aviation System, Ronald S. Brooks, Jerry L. Beatty

Theses and Dissertations

This study describes and analyzes military and FAA liaison efforts which impact on the management of the National Aviation System. It begins with the historical development of the National Airspace System (NAS), The system is evolutionary in nature and most innovations have come from user demands and outside sources, Long term government responsibility to manage the system has been secondary to the operation and maintenance functions, There has been duplication of effort due to poor coordination on developing common goals, The military has been the leader in developing technology that led to improvement of the system.

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Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1972, School Of Engineering, Air Force Institute Of Technology Oct 1973

Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1972, School Of Engineering, Air Force Institute Of Technology

AFIT Documents

This report contains abstracts of Master of Science Theses, Doctoral Dissertations, and faculty publications completed during the 1972 calendar year at the School of Engineering, Air Force Institute of Technology, at Wright-Patterson Air Force Base, Ohio.

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Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1971, School Of Engineering, Air Force Institute Of Technology Dec 1972

Afit School Of Engineering Contributions To Air Force Research And Technology. Calendar Year 1971, School Of Engineering, Air Force Institute Of Technology

AFIT Documents

This report contains abstracts of Master of Science theses and Doctoral Dissertations completed during the 1971 calendar year at the School of Engineering, Air Force Institute of Technology.

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Lasing Conditions Of Elemental Sulfur In A Gas Discharge, David E. Egbert Sep 1972

Lasing Conditions Of Elemental Sulfur In A Gas Discharge, David E. Egbert

Theses and Dissertations

The partial pressures from heated sulfur crystals and helium, and sulfur and nitrogen required for ionic sulfur laser action in a gas discharge were determined. Previous work with sulfur lasers is reviewed and population inversion mechanisms are presented for the ionic sulfur laser lines. Possible excitation mechanisms are presented for both electron and ion or atomic collision excitation. Transition diagrams for all the known ionic sulfur laser transitions and an approximate potential energy curve for the diatomic sulfur molecule are presented. Laser action was achieved only when a spark gap pulser was used with a laser tube especially designed to …

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Software Simulation Of The D17b Computer, Bruce Chatterton Mar 1972

Software Simulation Of The D17b Computer, Bruce Chatterton

Theses and Dissertations

A software program has been written which simulates the functions of the Minuteman D17B computer at the register transfer level. The simulation program is written in the FORTRAN Extended language to be used on the Intercom System (teletype) of a CDC 6600 computer system. The simulation program consists of a main program and eight subroutines. A programming language for the D17B simulation was formed which contains numbers and load codes, switches, and miscellaneous commands. Example programs run on the simulated computer have been included to show the types of output available.

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Report On Research, School Of Engineering, Air Force Institute Of Technology, 1962-1966, Air Force Institute Of Technology Nov 1967

Report On Research, School Of Engineering, Air Force Institute Of Technology, 1962-1966, Air Force Institute Of Technology

AFIT Documents

No abstract provided.

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Investigation Of The Platinum-Rich Portion Of The Platinum-Tantalum Phase Diagram, Bob Dean Browning Aug 1961

Investigation Of The Platinum-Rich Portion Of The Platinum-Tantalum Phase Diagram, Bob Dean Browning

Theses and Dissertations

The Pt-Ta binary system was investigated at two isotherms;1000°C and 1500°C, and at eleven alloy compositions in the range of 50 to 100 atomic percent platinum. The alloys were examined by x-ray diffraction and metallography. Three intermetallic compounds, Pt2Ta, Pt3Ta, and Pt4Ta were found to exist in this composition range. The Pt4Ta intermetallic appeared only at the 1500°C isotherm. Platinum dissolved tantalum substitutionally to 90 atomic percent at 1500 °C and to approximately 80 atomic percent at 1000 °C.

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The United States Air Force Institute Of Technology Class Of 1949, Air Force Institute Of Technology, Laurence E. Craigie Jan 1949

The United States Air Force Institute Of Technology Class Of 1949, Air Force Institute Of Technology, Laurence E. Craigie

AFIT Documents

No abstract provided.

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The United States Air Force Institute Of Technology Class Of 1948, Air Force Institute Of Technology, Edgar P. Sorensen Jan 1948

The United States Air Force Institute Of Technology Class Of 1948, Air Force Institute Of Technology, Edgar P. Sorensen

AFIT Documents

Excerpt: "The class of '48 as the first major group to complete the full curricula of the Air Force Institute of Technology marks a timely achievement in postwar Air Force education. A salute to the class as a whole and good wishes to each individual in his future assignments!"

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Air Corp Engineering School, Wright Field - 1935 Catalog, Air Corps Engineering School, A. W. Robins Jul 1935

Air Corp Engineering School, Wright Field - 1935 Catalog, Air Corps Engineering School, A. W. Robins

AFIT Documents

This publication is issued to fill the need on the part of the Air Corps in general for a more detailed description of the curriculum of the Air Corps Engineering School. This description will serve as a guide to the accepted applicant in his preliminary preparation and a standard by which the individual Air Corps officer can arrive at an intelligent decision as to whether his own enthusiasm and preparation will be sufficient to warrant making application for the course. Entrance requirements are definitely stated herein. For those who do not contemplate intensive aeronautical engineering training, this publication may be …

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