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Principal Effects of Axial Load on Moment-Distribution Analysis of Rigid Structures

Description: This thesis presents the method of moment distribution modified to include the effect of axial load upon the bending moments. This modification makes it possible to analyze accurately complex structures, such as rigid fuselage trusses, that heretofore had to be analyzed by approximate formulas and empirical rules. The method is simple enough to be practicable even for complex structures, and it gives a means of analysis for continuous beams that is simpler than the extended three-moment equation now in common use. When the effect of axial load is included, it is found that the basic principles of moment distribution remain unchanged, the only difference being that the factors used, instead of being constants for a given member, become functions of the axial load. Formulas have been developed for these factors, and curves plotted so that their applications requires no more work than moment distribution without axial load. Simple problems have been included to illustrate the use of the curves.
Date: July 1, 1935
Creator: James, Benjamin Wylie
Partner: UNT Libraries Government Documents Department

Principle of the Boerner airship

Description: The Boerner airship is built on entirely different principles from ordinary airships, of which the Zeppelin is the best known type. Mr. Boerner has abandoned the rigid body of the Zeppelin and has adopted a body with a double keel forming a rigid platform for attaching the gas ballonets, which must support the whole in the air.
Date: November 1, 1922
Creator: Kapteyn, A
Partner: UNT Libraries Government Documents Department

The Principles and Practice of Sampling Metallic Metallurgical Materials: with Special Reference to the Sampling of Copper Bullion

Description: From Introduction: "In this report considerable space has been devoted to general and theoretical principles on the ground that under modern conditions the best results in any field of activity can be attained only with the aid of an adequate knowledge of the best theories underlying the practice. The diffusion of such knowledge in the field of sampling metallic metallurgical materials appears to have been quite insufficient, and it is felt that when the principles involved are once thoroughly comprehended their universal application will be appreciated, so it will make no difference whether pig iron of gold bullion is offered for test. "
Date: 1916
Creator: Keller, Edward
Partner: UNT Libraries Government Documents Department

Principles involved in the cooling of a finned and baffled cylinder

Description: An analysis of the cooling problems for a finned cylinder is made on the basis of the known fundamental principles of heat transfer from pipes. Experimental results that support the analysis are presented. The results of previous investigations on the problem are evaluated on the basis of the analysis and the results. An illustration of the application of these principles to a specific problem is included.
Date: June 1, 1938
Creator: Brevoort, M J
Partner: UNT Libraries Government Documents Department

Principles of moment distribution applied to stability of structures composed of bars or plates

Description: The principles of the cross method of moment distribution, which have previously been applied to the stability of structures composed of bars under axial load, are applied to the stability of structures composed of long plates under longitudinal load. A brief theoretical treatment of the subject, as applied to structures composed of either bars or plates, is included, together with an illustrative example for each of these two types of structure. An appendix presents the derivation of the formulas for the various stiffnesses and carry-over factors used in solving problems in the stability of structures composed of long plates.
Date: January 1, 1945
Creator: Lundquist, Eugene E.; Stowell, Elbridge Z. & Schuette, Evan H.
Partner: UNT Libraries Government Documents Department

Principles of moment distribution applied to stability of structures composed of bars or plates

Description: Principles of the cross method of moment distribution, which have previously been applied to the stability of structures composed of bars under axial load, are applied to the stability of structures composed of long plates under longitudinal load.
Date: January 1, 1943
Creator: Lundquist, Eugene E.; Stowell, Elbridge Z. & Schuette, Evan H.
Partner: UNT Libraries Government Documents Department

The Principles of Turbulent Heat Transfer

Description: The literature on turbulent heat transfer has in the course of years attained a considerable volume. Since this very complicated problem has not as yet found a complete solution, further studies in this field may be expected. The heat engineer must therefore accomodate himself to a constantly increasing number of theories and formulas. Since the theories generally start from hypothetical assumptions, and since they contain true and false assertions, verified knowledge and pure suppositions often being intermingled in a manner difficult to tell them apart, the specialist had difficulty in forming a correct evaluation of the individual studies. The need therefore arises for a presentation of the problem of turbulent heat transfer which is not initially bound by hypothetical assumptions and in which uninvestigated can be clearly distinguished form each other. Such a presentation will be given in the present treatment. Brief remarks with regard to the development of the theory of local heat transfer are included.
Date: September 1, 1957
Creator: Reichardt, H.
Partner: UNT Libraries Government Documents Department

Problem in Estimating Self-Supplied Industrial Water Use by Indirect Methods -- The California Example

Description: From introduction: The intent of this study was to develop a method of estimating overall self-supplied industrial water requirements using coefficients of water use for production and employment from five major-use industrial categories. Those categories included food and kindred products, lumber, pulp and paper, chemical and allied products, and petroleum industries.
Date: 1983
Creator: Burt, R. J.
Partner: UNT Libraries Government Documents Department

The problem of cooling an air-cooled cylinder on an aircraft engine

Description: An analysis of the cooling problem has been to show by what means the cooling of an air-cooled aircraft engine may be improved. Each means of improving cooling is analyzed on the basis of effectiveness in cooling with respect to power for cooling. The altitude problem is analyzed for both supercharged and unsupercharged engines. The case of ground cooling is also discussed. The heat-transfer process from the hot gases to the cylinder wall is discussed on the basis of the fundamentals of heat transfer and thermodynamics. Adiabatic air-temperature rise at a stagnation point in compressible flow is shown to depend only on the velocity of flow.
Date: January 1, 1941
Creator: Brevoort, M J & Joyner, U T
Partner: UNT Libraries Government Documents Department

The problem of fuel measurement : the Schiske "Konsummeter"

Description: Any measuring device, which immediately indicates the rate of fuel consumption in the desired units, has the advantage of saving considerable time and fuel, besides facilitating the adjustment of the carburetor. The Schiske "Konsummeter" (made by the "PS-Vergaser and Apparatebau A. G.") was designed from the above viewpoint.
Date: May 1, 1925
Creator: Praetorius, K. R. H.
Partner: UNT Libraries Government Documents Department

Problem of glider models

Description: Any one endeavoring to solve the problem of soaring flight is confronted not only by structural difficulties, but also by the often far more difficult aerodynamic problem of flight properties and efficiency, which can only be determined by experimenting with the finished glider.
Date: September 1, 1922
Creator: Lippisch, Espenlaub
Partner: UNT Libraries Government Documents Department

The problem of landing

Description: The author discusses various aspects of landing aircraft such as the actual process of touchdown and the problems associated with the tail skid touching the ground before the landing gear.
Date: August 1922
Creator: Pistolesi, E
Partner: UNT Libraries Government Documents Department

The problem of liquid fuels (for aircraft engines)

Description: The crisis which troubles the world market for liquid fuel in general and for carburants in particular is doubtless one of the most serious ever experienced by modern industry. It is a national crisis of economic and political independence for countries like Italy and France. The solutions suggested for meeting the lack of liquid fuel may be summed up under two general headings: the economical use of the petroleum now available; creation of petroleum substitutes from natural sources within the country. The process of cracking is described at length.
Date: July 1, 1924
Creator: Gallo, Gino
Partner: UNT Libraries Government Documents Department

The problem of longitudinal stability and control at high speeds

Description: In high-speed dives many airplanes exhibit a dangerous tendency to continue diving in spite of the application of large control forces. Wind-tunnel tests have confirmed that these difficulties are not peculiar to any particular configuration, so that the problem is of interest to all designers of high-speed airplanes. The purpose of this report is to acquaint designers with the cause of difficulties and with the means now known for their alleviation.
Date: January 1, 1943
Creator: Hood, Manley J & Allen, H Julian
Partner: UNT Libraries Government Documents Department