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Articles 1771 - 1800 of 2222
Full-Text Articles in Mechanical Engineering
Rubber Covered Rolls-The Nonlinear Elastic Problem, R. C. Batra
Rubber Covered Rolls-The Nonlinear Elastic Problem, R. C. Batra
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The problem of the indentation of a rubberlike layer bonded to a rigid cylinder and indented by another rigid cylinder is analyzed. The rubberlike layer is assumed to be made of a homogeneous Mooncy-Rivlin material. The materially and geometrically nonlinear problem is solved by using the finite-element code developed by the author. Results computed and presented graphically include the pressure profile at the contact surface, stress distribution at the bond surface and the deformed shape of the indented surface. © 1980 by ASME.
Demonstration Of Low Btu Gasification Using The Grow Facility, V. J. Flanigan, Y. Omurtag
Demonstration Of Low Btu Gasification Using The Grow Facility, V. J. Flanigan, Y. Omurtag
UMR-DNR Conference on Energy
No abstract provided.
Energy Analysis Of An Existing Solar Assisted Heat Pump Installed In A Mid-Missouri Residence, Dennis W. Schulte, Albert Chaarles, Ronald H. Howell
Energy Analysis Of An Existing Solar Assisted Heat Pump Installed In A Mid-Missouri Residence, Dennis W. Schulte, Albert Chaarles, Ronald H. Howell
UMR-DNR Conference on Energy
No abstract provided.
Annual Heating And Cooling Requirements For Missouri Homes And Effectiveness Of Energy Conservation Techniques, Michael Boles, Michael Bell, Ronald H. Howell
Annual Heating And Cooling Requirements For Missouri Homes And Effectiveness Of Energy Conservation Techniques, Michael Boles, Michael Bell, Ronald H. Howell
UMR-DNR Conference on Energy
No abstract provided.
Energy Conservation Alternatives For Residential Buildings, Farhat Lahkavani, Harry J, Sauer Jr., Ronald H. Howell
Energy Conservation Alternatives For Residential Buildings, Farhat Lahkavani, Harry J, Sauer Jr., Ronald H. Howell
UMR-DNR Conference on Energy
No abstract provided.
Nucleation Experiments With Monodisperse Nacl Aerosols., Darryl J. Alofs, M. B. Trueblood, D. R. White, V. L. Behr
Nucleation Experiments With Monodisperse Nacl Aerosols., Darryl J. Alofs, M. B. Trueblood, D. R. White, V. L. Behr
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Nucleation Experiments with Monodisperse NaCl Aerosols Showed Good Agreement with the Kohler Theory Relating the Critical Super-Saturation S//c to the Dry Size. Aerosols Produced by Condensing NaCl Showed the Same S//c as Those Produced by Evaporating Aqueous NaCl Solution Droplets. This Indicates that If There is an Energy Barrier in Going from a Dry NaCl Particle to a Solution Droplet, This Energy Barrier is Small. the Fact that the Evaporation Aerosol Particles Are Cubical Crystals and the Condensation Aerosols Are Amorphous Spheres is Shown to Make No Difference in the Nucleation Threshold. the Investigation Also Gives Insights into the Performance …
Two-Dimensional Scattering From A Medium Of Finite Thickness, Dwight C. Look
Two-Dimensional Scattering From A Medium Of Finite Thickness, Dwight C. Look
Mechanical and Aerospace Engineering Faculty Research & Creative Works
No abstract provided.
Series Induction/Parallel Inverter Power Stage And Power Staging Method For Dc-Dc Power Converter, Don Cronin, John J. Biess
Series Induction/Parallel Inverter Power Stage And Power Staging Method For Dc-Dc Power Converter, Don Cronin, John J. Biess
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An improved series inductor/parallel inverter power stage and power staging method for a transistor controlled DC-DC power converter in which the integrating capacitance is located in the output of the power stage transformer and the series inductor has a secondary winding connected across this capacitance for transferring stored energy from the inductor primary directly to the transformer output rather than through the transformer, and current flow through the transformer primary is controlled by two parallel, alternately conducting pulse-width-modulated transistors in a manner such that only a single transistor is located in the main current flow path at any given time. …
Innovations In Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
Innovations In Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The status of the residential heat pump industry is reviewed. Some potential improvements in energy efficiency, operational reliability, and initial cost are described and delineated. These possible innovations include two-speed or variable speed compressors, reliable defrost initiation and termination, improved system components, modifications to the basic thermodynamic cycle, add-on-heat pumps, solar assisted heat pumps, annual cycle energy system, chemical heat pumps, and gas fired heat pumps.
Sizing Of Air-Conditioning Systems -- The New Methodology, Harry J. Sauer Jr., Ronald Hunter Howell
Sizing Of Air-Conditioning Systems -- The New Methodology, Harry J. Sauer Jr., Ronald Hunter Howell
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Accurate cooling load calculations for sizing air-conditioning equipment are more important today than ever. Properly sized equipment saves energy. This paper briefly describes a new method developed by ASHRAE for such calculations .
Design And Operational Characteristics Of A Retrofit Solar Heating System, D. J. Wetteroff, Bassem F. Armaly
Design And Operational Characteristics Of A Retrofit Solar Heating System, D. J. Wetteroff, Bassem F. Armaly
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The construction and the operation of a retrofit solar assisted space heating system are described. Performance characteristics of each component were measured and used to estimate the contribution of solar energy to the yearly space heating energy requirements.
University Of Missouri--Rolla Wood Energy Research, Yildirim Omurtag, V. J. Flanigan, Nathan E. Welch
University Of Missouri--Rolla Wood Energy Research, Yildirim Omurtag, V. J. Flanigan, Nathan E. Welch
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The overall objective of this project is to conduct a research and development program which will lead to the early commercialization of wood gasification technology to process wood residues typical of those found in the Ozark region.
Thrust-Impact Rock-Splitter, George Bromley Clark, T. F. Lehnhoff
Thrust-Impact Rock-Splitter, George Bromley Clark, T. F. Lehnhoff
Mining Engineering Faculty Research & Creative Works
A rock splitting tool having elongate laterally expanding metal pressure bars or feathers and an axial sliding wedge or spreader for radially separating the feathers, the wedge being driven by the combined and superimposed forces of a hydraulic thrust servomotor and an impact hammer. The driving paths for transmitting forces to the wedge are coaxial and partially in series and partially in parallel.
Two-Step Photoionization Of Potassium Atoms, Kaare J. Nygaard, Robert J. Corbin, James A. Jones
Two-Step Photoionization Of Potassium Atoms, Kaare J. Nygaard, Robert J. Corbin, James A. Jones
Physics Faculty Research & Creative Works
The cross section for photoionization of potassium atoms in the 4P2 states has been measured in a triple-crossed-beam experiment. © 1978 The American Physical Society.
Performance Of A Dual-Range Cloud Nucleus Counter., Darryl J. Alofs
Performance Of A Dual-Range Cloud Nucleus Counter., Darryl J. Alofs
Mechanical and Aerospace Engineering Faculty Research & Creative Works
An Instrument for Measuring the Concentrations of Cloud Condensation Nuclei as a Function of Nucleus Critical Supersaturation (S//c) is Described. in the Range 0. 1% Less Than Equivalent to S//c Less Than Equivalent to 0. 1%, the Instrument is Operated as a Vertical Flow Thermal Diffusion Chamber. in the Range of 0. 016% Less Than Equivalent to S//c Less Than Equivalent to 0. 1%, the Chamber is Operated at 100% Humidity, and the Equilibrium Radii of the Nuclei Are Measured with an Optical Counter. This Paper Presents a Large Body of Data Taken in the Laboratory to Evaluate the Performance …
Increased Aluminum Use And Its Impact On The Life-Cycle Energy Cost Of Automobiles, Yildirim Omurtag
Increased Aluminum Use And Its Impact On The Life-Cycle Energy Cost Of Automobiles, Yildirim Omurtag
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
This paper examines the life-cycle of a passenger automobile including ore refining, manufacture of components, assembly, driving and recycling to provide a general computerized model to be used in evaluating the impact of various material substitution rates and recycling policies on the total system energy consumption. The emphasis is on the use of increased aluminum to replace iron and steel.
A Solar Energy System For Space Heating And Space Cooling, Thomas J. Mcnamara
A Solar Energy System For Space Heating And Space Cooling, Thomas J. Mcnamara
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
To help reduce natural gas and electrical operating costs, a retrofit space heating and space cooling solar energy system is integrated into the existing conventional heating and air handling systems serving the exhibit spaces. This installation would not only provide substantial energy cost savings to the Museum, but it would also provide a means of showing and explaining the operation of an actual working solar energy system to the large number of daily visitors to the Museum. This report explains the design, operation and performance of this solar energy system.
A Small Horizontal Axis Wind Turbine Feeding Power Into The Utility Grid, G. C. Thomann, M. Jong, M. H. Snyder
A Small Horizontal Axis Wind Turbine Feeding Power Into The Utility Grid, G. C. Thomann, M. Jong, M. H. Snyder
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
A small horizontal axis wind turbine, with about a 2 kW power output, was constructed to convert wind energy into AC power to be fed into the utility grid. The machine is intended to model operation of the larger wind generators now being built. The variable pitch rotor is 18 ft in diameter and has a GA(W)-1 blade airfoil. The rotor is fabricated from sitka spruce mounted on a commercial propeller/hub system. Rotor speeds of from 75 to 150 rpm are used in operation. A chain drive and helical gear drive system steps up rotor speed to 1800 - 3600 …
Airfoil Data For Use Of Wind Turbine Designers, Melvin H. Snyder
Airfoil Data For Use Of Wind Turbine Designers, Melvin H. Snyder
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
This paper reviews design procedures for wind-axis turbine rotors. An "on-design" routine for rotor blade design is presented as well as an "off-design" performance calculation program. Resulting from this review are analyses of desirable characteristics of airfoil sections and of types of data which rotor designers need. Included in the paper are airfoil characteristics for candidate blade sections including 360 degree data for GA(W)-1 and GA(W)-2 airfoils.
Low Head Power Generation With Bulb Turbines, J. L. Carson, R. S. Samuelson
Low Head Power Generation With Bulb Turbines, J. L. Carson, R. S. Samuelson
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
Because of uncertainties, delays, and high costs associated with alternative electric energy sources, many agencies responsible for generation of electrical power are investigating means of replacing or supplementing their existing hydroelectric facilities. In the head range between 10 and 60 feet, the bulb-type generating unit, in which the generator is enclosed in a metal capsule within the water passage, has many advantages, including higher efficiency and lower cost, over other types of turbines. Two of the municipalities in the United States which have recently conducted feasibility studies for installing bulb turbines in their systems are the City of Idaho Falls, …
4th Annual Umr-Dnr Conference On Energy -- Entire Proceedings, University Of Missouri--Rolla
4th Annual Umr-Dnr Conference On Energy -- Entire Proceedings, University Of Missouri--Rolla
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
No abstract provided.
Heat Recovery Devices For Building Hvac Systems, Ronald H. Howell, Harry J. Sauer Jr.
Heat Recovery Devices For Building Hvac Systems, Ronald H. Howell, Harry J. Sauer Jr.
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The opportunities and advantages of air-to-air heat recovery are described. The five basic types (rotary regenerative, coil loop run around, open run-around, heat pipe, and plate type) are described and their typical performance is presented. The potential savings in operating costs as well as initial equipment costs for common applications are presented.
A Systems Study Of Our Energy Problems, S. C. Lee
A Systems Study Of Our Energy Problems, S. C. Lee
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The diminishing supply of petroleum and natural gas has induced many concerned citizens as well as many interest groups to study energy problems. Based on different sources of information and various degrees of economical consideration, conflicting conclusions have been reached. To help resolve this situation, a systems study was conducted. The available statistics on the supply and demand of energy were examined. The resources of nuclear energy, fossil fuel, and renewable energy sources were analyzed. Considerations were weighted equally on energy content, resource availability, existing technology, and consumer economics as well as on the impact of ecology and sociology. The …
Mixed Convection Across A Horizontal Cylinder With Uniform Surface Heat Flux, A. Mucoglu, T. S. Chen
Mixed Convection Across A Horizontal Cylinder With Uniform Surface Heat Flux, A. Mucoglu, T. S. Chen
Mechanical and Aerospace Engineering Faculty Research & Creative Works
No abstract provided.
Optimal Cantilever Dynamic Vibration Absorbers, R. G. Jacquot, J. Earl Foster
Optimal Cantilever Dynamic Vibration Absorbers, R. G. Jacquot, J. Earl Foster
Mechanical and Aerospace Engineering Faculty Research & Creative Works
This work considers the use of a double-ended cantilever beam as a distributed parameter dynamic vibration absorber applied to a single-degree-of-freedom system in the presence of sinusoidal forces. The problem is analyzed exactly and by an energy approach using a single mode approximation for the cantilever beam. The results for both techniques compare favorably and damping is introduced in the form of a complex beam modulus. Optimal tuning and optimal damping parameters are found for a given ratio of absorber mass to main mass. © 1977 by ASME.
Studies Of Vibrational Surface Modes In Ionic Crystals. I. Detailed Shell-Model Studies For The Unrelaxed (001) Face Of Seven Crystals Having The Rocksalt Structure, T. S. Chen, F. W. De Wette, G. P. Alldredge
Studies Of Vibrational Surface Modes In Ionic Crystals. I. Detailed Shell-Model Studies For The Unrelaxed (001) Face Of Seven Crystals Having The Rocksalt Structure, T. S. Chen, F. W. De Wette, G. P. Alldredge
Mechanical and Aerospace Engineering Faculty Research & Creative Works
We present a comprehensive, unified account of the lattice dynamics of unrelaxed (001) faces of seven crystals having the rock salt structure, three of which have an absolute gap between the acoustical and optical bulk bands (RbF, RbCl, and NaI) and four of which have overlap between these bulk bands (NaF, NaCl, LiF, and MgO). The results are obtained from calculations of the normal modes of a thin crystal film in which the ionic interactions are described by the rigid-shell model. An outline of the formulation of the shell model for the film is given, and the rapid convergence of …
Multiple High Voltage Output Dc-To-Dc Power Converter, Don Cronin, Bertrand F. Farber, Hartmut K. Gehm, Daniel S. Goldin
Multiple High Voltage Output Dc-To-Dc Power Converter, Don Cronin, Bertrand F. Farber, Hartmut K. Gehm, Daniel S. Goldin
Mechanical and Aerospace Engineering Faculty Research & Creative Works
Disclosed is a multiple output DC-to-DC converter. The DC input power is filtered and passed through a chopper preregulator. The chopper output is then passed through a current source inverter controlled by a squarewave generator. The resultant AC is passed through the primary winding of a transformer, with high voltages induced in a plurality of secondary windings. The high voltage secondary outputs are each solid-state rectified for passage to individual output loads. Multiple feedback loops control the operation of the chopper preregulator, one being responsive to the current through the primary winding and another responsive to the DC voltage level …
Comparative Residential Energy Consumption And Fuel Costs With Various Types Of Systems: Oil-, Gas-, Electric-Furnaces And Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
Comparative Residential Energy Consumption And Fuel Costs With Various Types Of Systems: Oil-, Gas-, Electric-Furnaces And Heat Pumps, Ronald Hunter Howell, Harry J. Sauer Jr.
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
The electric air-to-air heat pump for residential heating offers an economic alternative to systems traditionally used extensively for home heating, such as, oil or gas fired furnaces and electric resistance heat. This simulation analysis showed that using 1976 mid- Missouri fuel costs, an oil fired furnace was the least expensive to operate of the three traditional type residential heating units. LP gas heating was 19% higher than oil heat while electric resistance heating was 26% higher in cost than oil. The typical air-to- air heat pumps showed a 29% reduction in the heating bill when compared to an oil furnace.
3rd Annual Umr-Mec Conference On Energy -- Entire Proceedings, University Of Missouri--Rolla
3rd Annual Umr-Mec Conference On Energy -- Entire Proceedings, University Of Missouri--Rolla
UMR-MEC Conference on Energy / UMR-DNR Conference on Energy
No abstract provided.
Predicting Natural Frequencies Of A Hydrodynamically Lubricated Journal Bearing With Constant Oil Supply Pressure, D. C. Edwards, N. Khorzad, Charles L. Edwards
Predicting Natural Frequencies Of A Hydrodynamically Lubricated Journal Bearing With Constant Oil Supply Pressure, D. C. Edwards, N. Khorzad, Charles L. Edwards
Mechanical and Aerospace Engineering Faculty Research & Creative Works
The analytical and experimental investigations reported here deal with the natural frequencies and system behavior of a full journal bearing subjected to a small sinusoidal load superimposed on a large unidirectional static load. The analysis, verified by experimentation, shows that the bearing can be regarded as two independent second-order systems acting perpendicular to each other. The variable coefficients of the equations of motion cause the bearing to behave as an underdamped system for low values of static eccentricity ratio to, and as an overdamped system for intermediate values of to. The bearing tends to be unstable above a particular to. …