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- Acoustic filters<br />Sound -- Transmission (1)
- Aluminum -- Fatigue -- Testing<br />Poisson's equation<br />Strains and stresses (1)
- Boundary layer -- Testing<br />Turbulence -- Mathematical models (1)
- Damping (Mechanics)<br />Shear (Mechanics) (1)
- Damping (Mechanics)<br />Vibration -- Computer programs (1)
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- Damping (Mechanics)<br />Vibration -- Mathematical models<br />Plates (Engineering)<br />Energy dissipation<br />Shear waves (1)
- Dynamometer<br />Electric controllers<br />Electric current regulators -- Design (1)
- Elastic plates and shells -- Stability<br />Finite element method<br />Buckling (Mechanics)<br />Stress concentration (1)
- FORTRAN (Computer program language)<br />Insulation (Heat)<br />Mathematical optimization -- Data processing (1)
- Feedback control systems<br />Automatic control -- Data processing<br />Automatic control -- Computer programs (1)
- Film boiling -- Testing<br />Heat -- Transmission -- Testing (1)
- Gyro compass<br />Dynamics -- Mathematical models<br />Lagrange equations<br />Runge-Kutta formulas (1)
- Heat -- Convection, Natural<br />Heat -- Convection, Natural -- Mathematical models<br />Dimensional analysis<br />Boundary layer<br />Analog computer simulation (1)
- Links and link-motion<br />Machinery, Kinematics of<br />Mechanical movements -- Design (1)
- Machine design -- Computer programs<br />Mechanical movements<br />Machinery, Kinematics of -- Computer programs (1)
- Vibration -- Mathematical models<br />Damping (Mechanics) (1)
- Vibration -- Measurement<br />Boundary value problems (1)
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Articles 1 - 22 of 22
Full-Text Articles in Engineering
Structure Of Shock Waves With Nonequilibrium Radiation And Ionization, Harlan F. Nelson, R. Goulard
Structure Of Shock Waves With Nonequilibrium Radiation And Ionization, Harlan F. Nelson, R. Goulard
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The investigations of this study are concerned with: (1) the physical processes that occur in the precursor and in the nonequilibrium region behind a strong shock wave during its approach to equilibrium in an argon like gas; (2) the influence of different atom-atom collisional rates in the relaxation region on the precursor; and (3) the cause of precursor ionization, which in this study has been assumed to be the photoionization of both the ground and excited states. The argon like gas is regarded as a combination of two gases: one consisting of electrons and the other of atoms and ions. …
Methods For Evaluating The Performance Of Small Acoustic Filters, William S. Gatley, Raymond Cohen
Methods For Evaluating The Performance Of Small Acoustic Filters, William S. Gatley, Raymond Cohen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Experimental methods are needed for determining the characteristics of small acoustic filters used in systems with pulsating gas flows. These characteristics could then be used to predict the performance of proposed filter designs in a particular system, according to plane wave acoustic theory. Dependence on trial-and-error experimentation in solving noise control problems would thus be minimized. A literature survey revealed only a few earlier attempts to evaluate the acoustic performance of small filters and filter elements. Three methods for determining reflection and transmission factors are described, evaluated, and compared. A method employing a standing wave tube of unique design is …
Film Boiling Heat Transfer From An Oscillating Sphere, L. G. Rhea, R. G. Nevins
Film Boiling Heat Transfer From An Oscillating Sphere, L. G. Rhea, R. G. Nevins
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An experimental investigation has been undertaken to determine the effect of oscillation of the heat transfer surface on turbulent film boiling heat transfer. A transient technique was used to calculate the heat flux from copper spheres of 1 in., 3/4 in., and 1/2 in. dia. In all tests, saturated liquid nitrogen at atmospheric pressure was used as the boiling fluid. The data obtained were found to be in good agreement with published theory at zero frequency. The range of frequencies studied was from zero to approximately 12 cps at peak-to-peak amplitudes of 2 in. and 1 in., i.e., at amplitude-to-diameter …
Free-Convection Heat Transfer From An Inclined Heated Flat Plate In Air, S. C. Yung, R. B. Oetting
Free-Convection Heat Transfer From An Inclined Heated Flat Plate In Air, S. C. Yung, R. B. Oetting
Mechanical and Aerospace Engineering Faculty Research & Creative Works
No abstract provided.
Mutually Dependent Heat And Mass Transfer In Laminar Duct Flow, E. M. Sparrow, T. S. Chen
Mutually Dependent Heat And Mass Transfer In Laminar Duct Flow, E. M. Sparrow, T. S. Chen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An analysis is performed of the strongly coupled heat and mass transfer processes which result from sublimation of mass from the walls of a duct into a flowing gas, the latent heat being provided solely by convective transfer from the gas. The flow is assumed to be laminar and hydrodynamically developed. Results are given for the stream ward variations of the bulk and wall temperatures and mass fractions, of the heat and mass transfer rates, and of the local heat transfer coefficient. Representative temperature and mass fraction profiles are also presented. Entrance lengths characterizing the near approach to fully developed …
A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya
A Theoretical Analysis Of The Free Vibrations Of A Clamped Circular Plate With Damping, Bhalchandra Krishnaji Vaidya
Masters Theses
"A theoretical analysis of the free vibrations of a clamped circular plate was undertaken. The effects of transverse shear were considered for application to relatively thick plates in which there exist sharp transients and frequencies corresponding to higher modes. The method adopted by R. D. Mindlin was used to develope [sic] the differential equation of motion for the plate. The damping effect due to the resistance of the medium in which the plate vibrates was also considered. This damping was assumed to be due to the generation of pressure waves caused by the displacement of the plate...Since the solution requires …
Experimental Determination Of Dynamic Properties Of Aluminum Including Poisson's Ratio, Terry Lee Holman
Experimental Determination Of Dynamic Properties Of Aluminum Including Poisson's Ratio, Terry Lee Holman
Masters Theses
"Two rods of 7075-T651 aluminum are longitudinally impacted to investigate the material's dynamic properties. The test rod, initially at rest, is instrumented with strain gages to record the strain-time history after the impact rod, accelerated to uniform velocity by an air gun launcher, strikes the test rod. A camera records the strain-time pattern displayed on an oscilloscope. The experiment indicates a consistent rise time of approximately 9 µsec. Simple one-dimensional theory correlates well with the experimental data. Compensation is included for the transverse sensitivity of the gages used. The dynamic values for both the modulus of elasticity and Poisson's ratio …
A Finite Element Method For Geometrically Nonlinear Large Displacement Problems In Thin, Elastic Plates And Shells, Ronald August Melliere
A Finite Element Method For Geometrically Nonlinear Large Displacement Problems In Thin, Elastic Plates And Shells, Ronald August Melliere
Doctoral Dissertations
"A finite element method is presented for geometrically nonlinear large displacement problems in thin, elastic plates and shells of arbitrary shape and boundary conditions subject to externally applied concentrated or distributed loading. The initially flat plate or curved shell is idealized as an assemblage of flat, triangular plate, finite elements representing both membrane and flexural properties. The 'geometrical' stiffness of the resulting eighteen degree-of-freedom triangular element is derived from a purely geometrical standpoint. This stiffness in conjunction with the standard small displacement 'elastic' stiffness is used in the linear-incremental approach to obtain numerical solutions to the large displacement problem. Only …
The Analysis Of R-S-S-R Spatial Four-Bar Mechanism, David Perng Chyi
The Analysis Of R-S-S-R Spatial Four-Bar Mechanism, David Perng Chyi
Masters Theses
"Although many methods are known for the kinematic analysis of spatial mechanisms, such as descriptive geometry, vector analysis, dual number theory, matrices, screw calculus, and various other methods, a better way to analyze the specific R-S-S-R four-bar mechanism is to use tensor methods in order to eliminate the apparently formidable and tedious tasks of mathematically formulating problems and obtaining solutions. The analysis described in this paper is developed basically by using tensor notations and operations, and the calculations take advantage of the capabilities of modern digital computers. A FORTRAN program for the IBM 360 Data Processing System which will analyze …
Method For Optimizing Multi-Layer Insulation, William Donald Morath
Method For Optimizing Multi-Layer Insulation, William Donald Morath
Masters Theses
"The use of multi-layer insulation can result in reduced material cost, weight, or volume. A method for selecting layer materials is described. Each layer material is selected to operate at its upper temperature limit and to contribute to the overall performance of the wall. The analyses required for optimizing flat and cylindrical walls are developed. Use of the digital computer makes it feasable [sic] to select layer materials from a large group of candidates. Fortran IV programs for optimizing flat and cylindrical walls are presented, and their use is demonstrated by the solution of example problems. Methods for improving the …
Film Boiling From Inclined Flat Surfaces, Charles Ernest Price
Film Boiling From Inclined Flat Surfaces, Charles Ernest Price
Masters Theses
"The object of this investigation was to determine the effect of inclination on the heat transfer for saturated film pool boiling from a flat plate heater. Nitrogen at atmospheric pressure was used as the test fluid. The test plate was oriented at various angles from the horizontal position and the convective film coefficient was determined for each angle. Tests were conducted for heater angles of 0°, 30°, 60°, and 90°. The heater strip was placed in a container of the liquid and was heated electrically. Heat transfer results were obtained for plate temperatures ranging from 100 to 800°F. As the …
Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon
Apparatus And Techniques For The Plane Wave Analysis Of Acoustic Filters, Victor Hugo Simon
Masters Theses
"This thesis describes a method for determining the reflection and transmission characteristics of acoustic filters under static (i.e. no flow) conditions. These characteristics are obtained by the combination of linear plane wave acoustic theory with a sequential experimental procedure. The experimental data necessary for the calculation of the reflection characteristics were obtained from measurements made on the inlet side of the filter with a standing wave tube apparatus. In order to calculate the transmission characteristics of the filter, the standing wave measurements were augmented with measurements taken on both the inlet and outlet side of the filter. This was accomplished …
A Computerized Method For Finding The Dynamic Response Of Multi-Mass Systems With Damping To Arbitrary Inputs, Bakulesh Balbhadra Patel
A Computerized Method For Finding The Dynamic Response Of Multi-Mass Systems With Damping To Arbitrary Inputs, Bakulesh Balbhadra Patel
Masters Theses
"A practical procedure for the systematic application of Foss's method to the solution of multi-degree-of-freedom damped systems is presented. It is relatively easy to determine the response of classically damped systems to various inputs. For non-classically damped systems the method proposed by K. A. Foss has been employed. This method gives an exact and complete solution for the response of linear multi-mass damped systems subjected to arbitrary inputs. Since the method requires lengthy and complex computations, the use of a digital computer is essential. In order to obtain the complete response of a multi-mass damped system to both sinusoidal and …
A Comparison Of Lumped Parameter Models Commonly Used To Describe One-Dimensional Vibration Problems, Suresh Kumar Tolani
A Comparison Of Lumped Parameter Models Commonly Used To Describe One-Dimensional Vibration Problems, Suresh Kumar Tolani
Masters Theses
"Three lumped parameter model representations of the one-dimensional uniform continuous system in a vibration state are examined. The exact (continuous) solutions were used as a reference to evaluate the accuracy of the results obtained via these discrete element models. The model comparisons, carried out for both the principal modes and the systems under forced excitations, are based on the maximum strain energy. The effect of varying the number of segments in the model representation showed improvement in approximating the exact strain energy solution as the number of segments was increased. In general, the results of the model comparisons based on …
Dynamic Response Of A Gyrocompass, Subhash Govind Kelkar
Dynamic Response Of A Gyrocompass, Subhash Govind Kelkar
Masters Theses
"A gyrocompass with three degrees of freedom is studied and an attempt made to solve the exact equations of motion numerically. The equations are obtained by using the Lagrange formulation of the problem. The kinetic energy and the potential energy of the system are determined from the energies of the various components. These are then substituted into Lagrange's equation to obtain the three equations of motion for the three angular coordinates. As few restrictive assumptions as possible are made during this development. From these exact equations of motion an approximate analytical solution is obtained by making several assumptions and then …
The Use Of Turbulence Energy Equation In Boundary Layer Study, Ro-Chi Tai
The Use Of Turbulence Energy Equation In Boundary Layer Study, Ro-Chi Tai
Masters Theses
"A turbulent boundary layer problem has been studied analytically and compared with an available experiment in the literature. Correlations of the experimental data were made to investigate the validity of the commonly used empirical relations on turbulent shear stresses. It was found that the model which related the local turbulent shear stress linearly with the local turbulent kinetic energy, as used by Bradshow et. al., appeared to be most reasonable. combining this model with the expression of turbulent viscosity given by Boussinesq, it was then possible to introduce the turbulence-energy equation in addition to the governing equations of continuity and …
Design Of R-C-C-R Spatial Mechanism, Kao-Chien Hsei
Design Of R-C-C-R Spatial Mechanism, Kao-Chien Hsei
Masters Theses
"An analysis to design a particular R-C-C-R spatial mechanism was developed using tensor notations and operations. This specific R-C-C-R spatial mechanism can be used to couple two shafts intersected at a skew angle with constant rotating speed ratio. This skew angle, or bending angle of the two shaft, may vary from 30 up to 180 degrees. The governing equations of relative positions of the mechanism were formulated as a function of two variables: the bending angle of the shafts and the rotating angle of the input link. To exemplify the various design conditions, the design parameter versus the bending angle …
Dynamic Response Of Circular Plates To Transient And Harmonic Transverse Loads Including The Effect Of Transverse Shear And Rotary Inertia, Perakatte Joseph George
Dynamic Response Of Circular Plates To Transient And Harmonic Transverse Loads Including The Effect Of Transverse Shear And Rotary Inertia, Perakatte Joseph George
Doctoral Dissertations
"Using an improved theory of plate vibration suggested by R. D. Mindlin which takes into account the effects of transverse shear and rotary inertia, free and forced transverse vibrations of uniform circular plates are studied and the results compared with those obtained using the classical theory of plate vibration. The governing equations are developed in polar coordinates using the equations of elasticity. Frequency equations for axisymmetric and antisymmetric vibrations are derived for solid circular plates under different boundary conditions and for an annular plate rigidly mounted on a shaft. The response of plates to different types of rapidly applied axisymmetric …
Analysis Of A Water Level Control, Bhupendra Girdharlal Shah
Analysis Of A Water Level Control, Bhupendra Girdharlal Shah
Masters Theses
"This thesis presents the analysis of a controller for a liquid level control system. The controller was built using an analog computer providing the ability to easily construct up to three modes of control. The controllers analyzed were: 1.) Proportional, 2.) Proportional plus reset, and 3.) Proportional plus reset plus preact. The system was tuned experimentally to provide satisfactory operation and root loci were also plotted to show the system stability for the three modes"--Abstract, page ii.
The Design Of A Direct Current Generator Field Controller, Melvyn Elwin Downs
The Design Of A Direct Current Generator Field Controller, Melvyn Elwin Downs
Masters Theses
"A controller was built utilizing transistors and silicon controlled rectifiers to allow torque control of the General Electric dynamometer, type TLC-50. The current gain of the controller was approximately 10⁶ such that the field current could be controlled by an input current of zero to approximately two microaaperes. The transfer function for the controller-dynamometer system was experimentally determined. The results indicate that the gain of the open loop torque control system is constant for frequencies up to 1.1 radians per second. Satisfactory values of gain for proportional and proportional plus integral control, were experimentally determined by operating the closed loop …
Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy
Application Of Approximate Transmission Matrices To Describe Transverse Beam Vibrations, Ranjit Kumar Roy
Masters Theses
"This paper is a report of an investigation of an approximate method for finding the principal mode frequency roots for beams in transverse vibration. The method utilizes approximate transmission matrices obtained by a power series expansion of the basic differential equation which governs the transmission matrix. Investigation has been carried out to examine the efficiency of the method in producing the first several normal mode frequency roots. This has been achieved by applying the method to several uniform and non-uniform beams and comparing the results with the exact solutions. The technique has further been applied to non-uniform beams of tapered …
Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai
Investigation Of Free Convection Heat Transfer From An Inclined Flat Plate, Phairojna Sang-Urai
Masters Theses
"The experimental investigation was conducted to determine temperature distribution and convective heat transfer coefficients in terms of Nusselt number for an inclined heated flat plate in air. The heated surface of the aluminum flat plate was set facing upward and moved through seven positions from the vertical to the horizontal. The investigation shows that the local Nusselt number can be predicted by Kiekus's solution within 12 per cent for inclination angles from the vertical through 75° from the vertical. In the case of the vertical position, Eckert's solution gives a better prediction. For the horizontal position the results show good …