Serial/Series Title
Country
States
Month
247 Matching Results
Results open in a new window/tab. Unexpected Results? Search the Catalog Instead.
Results:
1 - 24 of
247
next
Increasing the Volumetric Efficiency of Diesel Engines by Intake Pipes
"Development of a method for calculating the volumetric efficiency of piston engines with intake pipes. Application of this method to the scavenging pumps of two-stroke-cycle engines with crankcase scavenging and to four-stroke-cycle engines. The utility of the method is demonstrated by volumetric-efficiency tests of the two-stroke-cycle engines with crankcase scavenging. Its practical application to the calculation of intake pipes is illustrated by example" (p. 1).
Date:
March 1933
Creator:
List, Hans
System:
The UNT Digital Library
A Restricted List of Aircraft Materials Research Projects
This report contains a selected list of Government sponsored research projects on related aircraft materials in effect during the calendar year 1947. Information is contained on titles, description, sponsoring and conducting agencies.
Date:
May 4, 1948
Creator:
unknown
System:
The UNT Digital Library
Wind-Tunnel Tests of a Model of a Wingless Fin-Controlled Missile to Obtain Static Stability and Control Characteristics Through a Range of Mach Numbers From 0.5 to 0.88
"An investigation at medium to high subsonic speeds has been conducted in the Langley low-turbulence pressure tunnel to determine the static stability and control characteristics and to measure the fin normal forces and moments for a model of a wingless fin-controlled missile. With the horizontal-fin deflection limited to a maximum of 6 degrees, longitudinally stable and trimmed flight could not be maintained beyond an angle of attack of 17 degrees for a Mach number of 0.88 and beyond 20 degrees for a Mach number of 0.50 for any center-of-gravity location without the use of some auxiliary stability or control device such as jet vanes" (p. 1).
Date:
April 12, 1954
Creator:
Burrows, Dale L. & Newman, Ernest E.
System:
The UNT Digital Library
Standard Symbols for Helicopters
"A list of standard symbols for rotating-wing aircraft is presented. The list of symbols is subdivided for ready reference under appropriate headings, the symbols being restricted to those most generally used in studies of helicopter aerodynamics" (p. 1).
Date:
June 1948
Creator:
Gessow, Alfred
System:
The UNT Digital Library
NACA Conference on Engine Stall and Surge
A compilation of the six technical papers presented at the NACA Conference on Engine Stall and Surge on February 3, 1955 at the Lewis Flight Propulsion Laboratory. A list of conference attendees is also provided.
Date:
February 3, 1955
Creator:
unknown
System:
The UNT Digital Library
Automatic control systems satisfying certain general criterions on transient behavior
Report presenting an analytic method for the design of automatic controls that has been developed and starts from arbitrary criterions on the behavior of the controlled system and gives those physically realizable equations that the control system can follow in order to realize the behavior. The criterions used are developed in the form of certain time integrals. General results are shown for systems of second order and of any number of degrees of freedom.
Date:
June 1951
Creator:
Boksenbom, Aaron S. & Hood, Richard
System:
The UNT Digital Library
Automatic control systems satisfying certain general criterions on transient behavior
"An analytic method for the design of automatic controls is developed that starts from certain arbitrary criterions on the behavior of the controlled system and gives those physically realizable equations that the control system can follow in order to realize this behavior. The criterions used are developed in the form of certain time integrals. General results are shown for systems of second order and of any number of degrees of freedom. Detailed examples for several cases in the control of a turbojet engine are presented" (p. 207).
Date:
October 11, 1950
Creator:
Boksenbom, Aaron S. & Hood, Richard
System:
The UNT Digital Library
The Elastic Constants for Wrought Aluminum Alloys
"There are several constants which have been devised as numerical representations of the behavior of metals under the action of loadings which stress the metal within the range of elastic action. Some of these constants, such as Young's modulus of elasticity in tension and compression, shearing modulus of elasticity, and Poisson's ratio, are regularly used in engineering calculations. Precise tests and experience indicate that these elastic constants are practically unaffected by many of the factors which influence the other mechanical properties of materials and that a few careful determinations under properly controlled conditions are more useful and reliable than many determinations made under less favorable conditions" (p. 1).
Date:
January 1945
Creator:
Templin, R. L. & Hartmann, E. C.
System:
The UNT Digital Library
Some Research on the Lift and Stability of Wing-Body Combinations
The present paper summarizes and correlates broadly some of the research results applicable to fin-stabilized ammunition. The discussion and correlation are intended to be comprehensive, rather than detailed, in order to show general trends over the Mach number range up to 7.0. Some discussion of wings, bodies, and wing-body interference is presented, and a list of 179 papers containing further information is included. The present paper is intended to serve more as a bibliography and source of reference material than as a direct source of design information.
Date:
July 2, 1959
Creator:
Purser, Paul E. & Fields, E. M.
System:
The UNT Digital Library
Summary of methods for calculating dynamic lateral stability and response and for estimating aerodynamic stability derivatives
"A summary of methods for making dynamic lateral stability and response calculations and for estimating the aerodynamic stability derivatives required for use in these calculations is presented. The processes of performing calculations of the time histories of lateral motions, of the period and damping of these motions, and of the lateral stability boundaries are presented as a series of simple straightforward steps. Existing methods for estimating the stability derivatives are summarized and, in some cases, simple new empirical formulas are presented. Detailed estimation methods are presented for low-subsonic-speed conditions but only a brief discussion and a list of references are given for transonic and supersonic speed conditions" (p. 1).
Date:
December 13, 1950
Creator:
Campbell, John P. & McKinney, Marion O.
System:
The UNT Digital Library
Carburetor Design - a Preliminary Study of the State of the Art
Report presents a preliminary study of the state of the art of the design of carburetors for gasoline engines used in aeronautic, marine and land transportation service.
Date:
1917
Creator:
Lucke, Charles Edward & Willhöfft, Friederich Otto
System:
The UNT Digital Library
Optimum controllers for linear closed-loop systems
Report presenting an analysis for optimum controllers of general, linear, time-invariant multiloop systems. General representations of controller characteristics, stable process characteristics, and error relations are used. General solutions are presented for four special cases.
Date:
April 1953
Creator:
Boksenbom, Aaron S.; Novik, David & Heppler, Herbert
System:
The UNT Digital Library
A Self-Synchronizing Stroboscopic Schlieren System for the Study of Unsteady Air Flows
Note presenting a description of a self-synchronizing stroboscopic schileren system developed for the visualization of unsteady air flows about aerodynamic bodies in wind tunnels. The instrument consists essentially of a conventional stroboscopic schileren system modified by the addition of electronic and optical elements to permit the detailed examination of phenomena of cyclic nature, but of fluctuating frequency.
Date:
October 1951
Creator:
Lawrence, Leslie F.; Schmidt, Stanley F. & Looschen, Floyd W.
System:
The UNT Digital Library
The Tracer Gas Method of Determining the Charging Efficiency of Two-Stroke-Cycle Diesel Engines
"A convenient method has been developed for determining the scavenging efficiency or the charging efficiency of two-stroke-cycle engines. The method consists of introducing a suitable tracer gas into the inlet air of the running engine and measuring chemically its concentration both in the inlet and exhaust gas. Monomethylamine CH(sub 3)NH(sub 2) was found suitable for the purpose as it burns almost completely during combustion, whereas the "short-circuited" portion does not burn at all and can be determined quantitatively in the exhaust" (p. 1).
Date:
January 1942
Creator:
Schweitzer, P. H. & DeLuca, Frank, Jr.
System:
The UNT Digital Library
The Mechanism of Thermal-Gradient Mass Transfer in the Sodium Hydroxide-Nickel System
Note presenting an investigation of thermal gradient mass transfer in the molten sodium hydroxide-nickel system. Possible mechanisms, including physical, electrochemical, and chemical, are discussed in terms of experimental and theoretical evidence. Kinetic equations are theoretically derived considering separately the follwing three factors as controlling overall rate of mass transfer: the chemical reaction, the diffusion process, and the forced circulation.
Date:
September 1957
Creator:
May, Charles E.
System:
The UNT Digital Library
The Mechanism of Thermal-Gradient Mass Transfer in the Sodium Hydroxide-Nickel System
"Thermal-gradient mass transfer" was investigated in the molten sodium hydroxide-nickel system. Possible mechanisms (physical, electrochemical, and chemical) are discussed in terms of experimental and theoretical evidence. Experimental details are included in appendixes.
Date:
June 20, 1957
Creator:
May, Charles E.
System:
The UNT Digital Library
Review of an Investigation of Ceramic Coatings for Metallic Turbine Parts and Other High-Temperature Applications
Note presenting an investigation to develop ceramic coatings that will prolong the life of alloys used in turbines, especially the blades, or permit their use at higher temperatures than would otherwise be predictable. Several steps were taken in order to establish whether or not protective coatings can be developed that will effect such an improvement.
Date:
March 1947
Creator:
Harrison, W. N.; Moore, D. G. & Richmond, J. C.
System:
The UNT Digital Library
Annual Report of the National Advisory Committee for Aeronautics (16th). Administrative Report Including Technical Reports Nos. 337 to 364
Report includes the National Advisory Committee for Aeronautics letter of submittal to the President, Congressional report, summaries of the committee's activities and research accomplished, bibliographies, and financial report.
Date:
1931
Creator:
unknown
System:
The UNT Digital Library
Theoretical study of some methods for increasing the smoothness of flight through rough air
Report presenting a theoretical study of the response to gusts and stability and control characteristics of an airplane equipped with systems in which wing flaps and elevators are operated to reduce accelerations in rough air. The surfaces are actuated by an automatic control system in response to indications of an angle-of-attack vane or accelerometer.
Date:
July 1951
Creator:
Phillips, William H. & Kraft, Christopher C., Jr.
System:
The UNT Digital Library
Development of Turbulence-Measuring Equipment
"Hot wire turbulence-measuring equipment has been developed to meet the more stringent requirements involved in the measurement of fluctuations in flow parameters at supersonic velocities. The higher mean speed necessitates the resolution of higher frequency components than at low speed, and the relatively low turbulence level present at supersonic speed makes necessary an improved noise level for the equipment. The equipment covers the frequency range from 2 to about 70,000 cycles per second" (p. 1).
Date:
1954
Creator:
Kovasznay, Leslie S. G.
System:
The UNT Digital Library
The dynamic lateral control characteristics of airplane models having unswept wings with round-and sharp-leading-edge sections
Report presenting an investigation in the free-flight tunnel for the purpose of comparing the dynamic lateral control characteristics of airplane models with round- and sharp-leading-edge wing sections. The two dynamic models used in the investigation had different mass characteristics and had different types of inertia. Results regarding the interpretation of flight-test results, high-inertia model, and normal-inertia model are provided.
Date:
November 1950
Creator:
Hassell, James L. & Bennett, Charles V.
System:
The UNT Digital Library
Two-Stroke-Cycle Engines With Unsymmetrical Control Diagram (Supercharged Engines)
As no investigation of supercharging in 2-stroke-cycle engines has been published up to the present, this article is an attempt in that direction, with a view to establishing the mathematical principles and the constructive rules for the design of such engines.
Date:
September 1939
Creator:
Zeman, J.
System:
The UNT Digital Library
Lateral and directional stability and control characteristics of a C-54D airplane
Data are presented showing compliance of C-54D with Army and Navy lateral and directional stability and control specifications. The airplane met requirements except for the rolling effectiveness pb/2V, the aileron forces in rolling, and the rudder forces in the asymmetric power conditions which were marginal. Also, the results of special tests concerning asymmetric power, asymmetric loading, and pitch due to yaw requested by the Airplane Handling Qualities Subcommittee of the Air Transport Association are presented.
Date:
March 24, 1949
Creator:
Talmage, Donald B. & Reeder, John P.
System:
The UNT Digital Library
Preliminary Investigation of a Gas Turbine With Sillimanite Ceramic Rotor Blades
Report presenting testing of a gas turbine with rotor blades of a sillimanite-base ceramic material that was designed, constructed, and operated to determine the practicability of ceramics for gas-turbine blading. Two different types of blades were used. Testing indicated that ceramic-blade turbines can be operated at high inlet gas temperatures and moderate speeds for short life, but modifications for extending their life may be possible.
Date:
July 1947
Creator:
Hartwig, Frederick J.; Sheflin, Bob W. & Jones, Robert J.
System:
The UNT Digital Library