Browsing by Author "Paslay, Paul R."

Now showing 1 - 9 of 9
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    An analysis of the performance of clamp-type flowline connectors with tapered hub faces
    (1983) Hirschberg, Alan J.; Walker, William F.; Paslay, Paul R.; Cheatham, John B.; Douglas, Andrew S.
    The use of clamp-type connectors with flat hub faces for flaw-line applications results in undesirable separations between the hub faces in the area of the pressure seal. Tapered hub faces are proposed as a design solution to the seal separation problem and a displacement analysis is presented. The axial symmetry of the problem and the symmetry about the radial plane of the hub faces interface are both utilized in the analysis. The equations resulting from the analysis are incorporated into a FORTRAN computer program allowing parametric studies to be conducted easily. The results from these studies provide a basis for the effective design of the tapered hubs. Finite element analyses of a particular clamp-type connector with flat and then tapered hub faces are conducted for the dual purposes of comparison with the thesis analytical solutions for the same design and detailed examination of the stress levels induced under various loading conditions.
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    An evaluation of the fixed point method of vibration analysis for a particular system with initial damping
    (1961) Bogy, David B; Paslay, Paul R.
    The object of this thesis is to investigate the validity of a popular approximate procedure which is used to select the optimum deeming for a Given mechanical system. Since this cannot be done in general, a particular system is chosen. Me exact determination of the optimum damping for a very simple mechanical system is performed. This value of optimum damping is then compared with the value obtained by the popular, so-called "fixed point" method. Since the fixed point solution is obtained independently of the initial dumping of the systems, the exact solution is worked out for sets of values of initial damping, which are typical of practical mechanical devices, to determined the influence of the initial damping on the optimum damping. It is found that for this particular system the fixed point method end the exact method give the same value for optima damping then there is no initial clamping in the system. As more and more initial clamping is added to the system the value for optimum clomping increases significantly, but it becomes a much less serious to use a value different from the optimum value.
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    Constitutive equations for a special class of gelling hygrosteric materials
    (1964) Fischer, Ferdinand Joseph; Paslay, Paul R.
    The object of this thesis is to investigate a set of constitutive equations which are proposed to describe the behavior of a special class of gelling hygrosteric materials. In recent literature, various relations have been suggested for the analytical description of rigid-viscous type materials which exhibit the thixotropic property of gelling. Various aspects of these relations are incorporated with a general form to which hygrosteric materials have been found to conform. The resulting constitutive equations are then examined for physical reliability by using them to obtain the solution of simple shear flow. The results were found to meet all physically motivated anticipations and it is felt that the proposed equations offer at least a reasonable qualitative description of actual gelling materials.
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    Experimental analysis of the bending of circular plates using reflected light
    (1960) McInnis, Bayliss C; Sims, James R.; Krahl, Nat W.; Paslay, Paul R.
    Experimental analysis of thin flat plates to determine moments and deflections using the method of reflected light and the particular technique developed by Ligtenberg is investigated. Circular plates of two thicknesses and two methods of loading are used to evaluate the method. The experimental results obtained for moments and deflections are compared with analytical solutions in each case using the usual thin plate theory. It was concluded that the Ligtenberg method can be used to advantage by engineers in analyzing plates which because of their shape support conditions, or method of loading are not easily analyzed using purely analytical methods.
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    Free oscillations of a gas-filled bubble in liquid
    (1964) Woo, Seng Hong; Paslay, Paul R.
    The oscillation of a gas-filled bubble in a fluid has been studied by several approaches. In general, the fluid is considered incompressible and the gas is assumed to behave as a linear spring. Surface tension and gravity effects are usually ignored. Radiation losses of such bubbles are often determined experimentally. The present study includes surface tension effects, the gas considered is a perfect gas and the fluid an inviscid, either compressible or incompressible fluid. Free oscillations of the bubble are studied. In order to induce free motion, the gas-fluid interface of the bubble is considered to be initially at rest and then a pulse of pressure is delivered to the interior of the bubble. The ensuing motions are analyzed by a numerical integration scheme. A harmonic analysis of the pressure field is carried out after the motion of a numerical example is accomplished.
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    Linear, incompressible hypofluent lubricants in continuous-sleeve journal bearings
    (1965) Fix, George Joseph; Paslay, Paul R.
    The author wishes to express his appreciation to Professor Paul R. Paslay for his suggestion of this thesis topic and for his invaluable assistance and advice during its preparation. Gratitude is also extended to my wife, Linda, without whose moral support and patience the completion of this thesis would have not been possible.
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    The stresses produced by uniform radial displacement of two circular hole in an infinite plate
    (1961) Kelly, Joseph L. (Joseph Luther), 1867-1925; Douglas, Jim, Jr.; Wilhoit, J. C.; Paslay, Paul R.
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    Torsional buckling of an extended twisted cylindrical rod under one-sided constraint
    (1964) Williams, William Orville; Paslay, Paul R.
    The problem considered is that of the determination of stability criteria for an extended twisted cylindrical rod resting on a rigid plane inclined with respect to a gravity field. It was assumed that the tensile strain of the rod was no larger than that compatible with infinitesimal elasticity theory but that the torsion might be finite. The energy theory of buckling was used. Prior to consideration of the specific problem, a formulation of the strain energy of an arbitrarily displaced cylindrical rod was made. It was assumed for this purpose that the rod suffers no lateral deformation and that sections of the rod initially plane and perpendicular to the center line remain plane and perpendicular to the tangent of the center line curve. The potential energy contributed by external loadings (the gravity force, axial tensile force and axial moment) was then computed and added to the strain energy expression above. An equilibrium configuration was then assumed and the total energy variation for perturbations of this configuration considered, The variation of energy for arbitrary displacements was found to be positive to first order effects so that the configuration is stable in the classical sense. Consideration of second order effects revealed that instability may develop for sufficiently large displacements from the equilibrium configuration. The conditions under which such instabilities can occur were formulated and reduced to a simple sequence of calculations for application.