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Application of statistical theory to beam-rider guidance in the presence of noise 1: Wiener filter theory
Report presenting a study of the application of Wiener filter theory to the design of a beam-rider guidance system operating in the presence of glint noise. The theory is then used to establish the theoretical lower limit of root-mean-square error and the corresponding desired transfer-function characteristics.
Date:
August 23, 1955
Creator:
Stewart, Elwood C.
System:
The UNT Digital Library
A Study of Hypersonic Small-Disturbance Theory
"A systematic study is made of the approximate inviscid theory of thin bodies moving at such high supersonic speeds that nonlinearity is an essential feature of the equations of flow. The first-order small-disturbance equations are derived for three-dimensional motions involving shock waves, and estimates are obtained for the order of error involved in the approximation. The hypersonic similarity rule of Tsien and Hayes, and Hayes' unsteady analogy appear in the course of the development" (p. 1).
Date:
1954
Creator:
Van Dyke, Milton D.
System:
The UNT Digital Library
On the Theory of the Propagation of Detonation in Gaseous Systems
"The existing theory of detonation is critically examined. It is shown that the considerations with which the steady value of the velocity of detonation is chosen are not convincing. In connection with the problem of the process of the chemical reaction in a detonation wave, the objections raised against the conceptions of Le Chatelier and Vieille of the 19th century with regard to the ignition of the gas by the shock wave are refuted" (p. 1).
Date:
November 1950
Creator:
Zeldovich, Y. B.
System:
The UNT Digital Library
Linearized Supersonic Theory of Conical Wings
Report presenting the theory of conical flow and its application to conical aircraft wings. Following an explanation of the theory, several types of wings are analyzed and compared with each other.
Date:
January 1950
Creator:
Lagerstrom, P. A.
System:
The UNT Digital Library
On Laminar and Turbulent Friction
Report deals, first with the theory of the laminar friction flow, where the basic concepts of Prandtl's boundary layer theory are represented from mathematical and physical points of view, and a method is indicated by means of which even more complicated cases can be treated with simple mathematical means, at least approximately. An attempt is also made to secure a basis for the computation of the turbulent friction by means of formulas through which the empirical laws of the turbulent pipe resistance can be applied to other problems on friction drag.
Date:
September 1946
Creator:
von Karman, T.
System:
The UNT Digital Library
A Multiple Bridge for Elimination of Contact-Resistance Errors in Resistance Strain-Gauge Measurements
Note presenting a multiple-bridge circuit that eliminates contact-resistance errors of the first order between the arms of the ordinary Wheatstone bridge. The circuit is applied to the elimination of the effects of contact-resistance variations that may occur in resistance strain-gage measurements made through switch contacts or slip rings. The general theory is derived and correct circuits and constructions are described.
Date:
March 1946
Creator:
Warshawsky, Isidore
System:
The UNT Digital Library
Meteorological Problems Associated With Commercial Turbojet-Aircraft Operation
Memorandum presenting an analysis and evaluation of the meteorological requirements and problems anticipated with the operation of commercial turbojet aircraft. Discussions concerning problems of temperature, wind, pressure, ceiling, visibility, cloud and clear-air turbulence, icing, and communication are included in this study.
Date:
June 21, 1955
Creator:
Working Group of the NACA Subcommittee on Meteorological Problems
System:
The UNT Digital Library
On the Drag and Shedding Frequency of Two-Dimensional Bluff Bodies
Note presenting a semiempirical study of the bluff-body problem. Some experiments with interference elements in the wake close behind a cylinder demonstrate the need for considering that region in any complete theory.
Date:
July 1954
Creator:
Roshko, Anatol
System:
The UNT Digital Library
Stresses Developed in Seaplanes While Taking Off and Landing
In the case of seaplanes, the lack of elastic shock absorbers, the presence of which might be quite dangerous, especially in taking off, makes it necessary to give some consideration to the phenomenon of landing. Special consideration must be given the process of taking off, since even moderately rough water may develop rather large stresses. The purpose of this communication is to show what has been accomplished in Italy and other countries and to draw a few useful conclusions.
Date:
July 1932
Creator:
Verduzio, Rudolfo
System:
The UNT Digital Library
Experimental Results With Airfoils Tested in the High-Speed Tunnel at Guidonia
The results are presented of a triple series of tests using force measurements, pressure-distribution measurements, and air flow photographs on airfoil sections suitably selected so that comparison could be made between the experimental and theoretical results. The comparison with existing theory is followed by a discussion of the divergences found, and an attempt is made to find their explanation.
Date:
July 1940
Creator:
Ferri, Antonio
System:
The UNT Digital Library
Report on the General Design of Commercial Aircraft
Given here are evaluations of six different European aircraft from the point of view of a passenger. The aircraft discussed are the DH 34, the Handley-Page W8B, the Farman Goliath, the Potez IX, the Spad 33 (Berline), and the Fokker F.III. The airplanes were evaluated with regard to seating comfort, ventilation, noise, seating arrangements, cabin doors, baggage accommodation, interior arrangement of cabins, pilot's position and communication with the pilot, pilot accommodations, view from the cabin, safety, and lavatory accommodations.
Date:
September 1922
Creator:
Warner, Edward P.
System:
The UNT Digital Library
The Subsidiary Gap as a Means for Improving Ignition
This report presents the results of an investigation into the utility, action, and design of the auxiliary spark gap as a means for insuring freedom from spark plug failure due to fouling, and also to enable the restarting of fouled plugs. A brief account is given of the use of this gap up to the present time and also of the statements concerning it which have gained some currency, most of which are shown to be erroneous. The simple theory of the action of the series gap is discussed and a detailed account given of the effect upon the sparking ability of the plug produced by changes in the values of the electrical resistance of the fouling and of the capacities in parallel with the plug and with the magneto or coil.
Date:
1920
Creator:
Gorton, W. S.
System:
The UNT Digital Library
A Study of the Application of Power-Spectral Methods of Generalized Harmonic Analysis to Gust Loads on Airplanes
Note presenting an examination of the applicability of some results from the theory of generalized harmonic analysis (or power-spectral analysis) to the analysis of gust loads on airplanes in continuous rough air. The general relations for linear systems between power spectrums of a random input disturbance and an output response are used to relate the spectrum of airplane load in rough air to the spectrum of atmospheric gust velocity.
Date:
January 1953
Creator:
Press, Harry & Mazelsky, Bernard
System:
The UNT Digital Library
Heat and Momentum Transfer Between a Spherical Particle and Air Streams
Note presenting experimentally determined heat-transfer coefficients for a spherical particle heated by an induction coil in a moving air stream for a range of Reynolds numbers using spheres of various sizes and various air velocities. The skin-friction factor representing the momentum transfer calculated from the boundary-layer theory showed good agreement with the experimental heat-transfer factor except in the lower range of Reynolds numbers studied.
Date:
March 1953
Creator:
Tang, Y. S.; Duncan, J. M. & Schweyer, H. E.
System:
The UNT Digital Library
Theoretical Investigations on the Efficiency and the Conditions for the Realization of Jet Engines
Contents: Preliminary notes on the efficiency of propulsion systems; Part I: Propulsion systems with direct axial reaction rockets and rockets with thrust augmentation; Part II: Helicoidal reaction propulsion systems; Appendix I: Steady flow of viscous gases; Appendix II: On the theory of viscous fluids in nozzles; and Appendix III: On the thrusts augmenters, and particularly of gas augmenters.
Date:
June 1950
Creator:
Roy, Maurice
System:
The UNT Digital Library
Statical Longitudinal Stability of Airplanes
This report, which is a continuation of the "Preliminary report on free flight testing" (report no. NACA-TR-70), presents a detailed theoretical analysis of statical stability with free and locked controls and also the results of many free flight test on several types of airplanes. In developing the theory of stability with locked controls an expression for pitching moment is derived in simple terms by considering the total moment as the sum of the moments due to wings and tail surface. This expression, when differentiated with respect to angle of incidence, enables an analysis to be made of the factors contributing to the pitching moment.
Date:
1921
Creator:
Warner, Edward P.
System:
The UNT Digital Library
A Study of the Application of Power-Spectral Methods of Generalized Harmonic Analysis to Gust Loads on Airplanes
"The applicability of some results from the theory of generalized harmonic analysis (or power-spectral analysis) to the analysis of gust loads on airplanes in continuous rough air is examined. The general relations for linear systems between power spectrums of a random input disturbance and an output response are used to relate the spectrum of airplane load in rough air to the spectrum of atmospheric gust velocity. The power spectrum of loads is shown to provide a measure of the load intensity in terms of the standard deviation (root mean square) of the load distribution for an airplane in flight through continuous rough air" (p. 371).
Date:
September 29, 1952
Creator:
Press, Harry & Mazelsky, Bernard
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
Annual Report of the National Advisory Committee for Aeronautics (15th). Administrative Report Including Technical Reports Nos. 309 to 336
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:
1930
Creator:
unknown
System:
The UNT Digital Library
Annual Report of the National Advisory Committee for Aeronautics (7th). Administrative Report Including Technical Reports Nos. 111 to 132
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, and expenditures.
Date:
1923
Creator:
unknown
System:
The UNT Digital Library
Effects of the End Fixation of Airplane Struts
The main purpose of this report is to give references to literature on the subject of end fixation of airplane struts and also to furnish the constructor with a general survey of the simplest methods for estimating the end-fixation effect.
Date:
September 1930
Creator:
Teichmann, Alfred
System:
The UNT Digital Library
Annual Report of the National Advisory Committee for Aeronautics (17th). Administrative Report Including Technical Report Nos. 365 to 400
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:
1932
Creator:
unknown
System:
The UNT Digital Library
The Gyroplane: Its Principles and Its Possibilities
This report begins by indicating several simple principles concerning the velocity distribution over the blades of a lifting propeller of diameter D, revolving at n revolutions per second, and animated by a horizontal movement of translation at speed V. The calculation, compared with the test data, has shown that the aerodynamic action of the air on the blades depends almost only on the velocity components in a plane at right angles to the blade span. A history of gyroplane and gyrocopter development is presented as well as the advantages in using both types of craft.
Date:
January 1937
Creator:
Breguet, Louis
System:
The UNT Digital Library
Effect of Intake Pipe on the Volumetric Efficiency of an Internal Combustion Engine
" The writer discusses the phenomena of expansion and compression which alternately take place in the cylinders of four-stroke engines during the induction process at a high mean piston speed due to the inertia and elasticity of the mixture in the intake pipe. The present paper is intended to demonstrate theoretically the existence of a most favorable pipe length for charging" (p. 1).
Date:
February 1929
Creator:
Capetti, Antonio
System:
The UNT Digital Library