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Full-Text Articles in Mechanical Engineering

Ole Miss Engineer 1993 Oct 1993

Ole Miss Engineer 1993

The Ole Miss Engineer

No abstract provided.


Ole Miss Engineer 1993 Apr 1993

Ole Miss Engineer 1993

The Ole Miss Engineer

No abstract provided.


Nondestructive Evaluation Of Radioactive Waste Drums Containing Cement-Solidified Liquid Wastes, John Steude, Jeff Anders, Richard Sporny, Ed Strickland Jan 1993

Nondestructive Evaluation Of Radioactive Waste Drums Containing Cement-Solidified Liquid Wastes, John Steude, Jeff Anders, Richard Sporny, Ed Strickland

Review of Progress in Quantitative Nondestructive Evaluation

There are approximately 1.4 million radioactive waste drums buried or stored at sites within the U.S. Department of Energy (DOE) complex [1,2]. Many of these drums contain cement-solidified liquid wastes. A common method for treating liquid wastes is to mix the liquid waste with cement and pour the waste/cement mixture into steel drums. This process stabilizes the liquid wastes in the hardened cement.


Inspection Of Ropes And Cables Using The Transverse-Impulse Vibration Technique, H. Kwun, G. L. Burkhardt, C. M. Teller Jan 1993

Inspection Of Ropes And Cables Using The Transverse-Impulse Vibration Technique, H. Kwun, G. L. Burkhardt, C. M. Teller

Review of Progress in Quantitative Nondestructive Evaluation

Ropes and cables are widely used as flexible tension members in various engineering applications such as suspension and cable-stayed bridges, mine hoists, offshore platforms, ski lifts, and cranes. In many cases, rope integrity is critical in ensuring overall structural safety, and rope failure can lead to a disastrous consequence. To ensure the structural safety of a rope, periodic visual inspection is generally made mandatory by industry, regulatory and certification bodies, and standard organizations dealing with ropes and cables.


Estimation Of Concrete Strength Of The Colorado Street Bridge Using The Impact-Echo Technique, Hemant S. Limaye, Sven E. Thomasen Jan 1993

Estimation Of Concrete Strength Of The Colorado Street Bridge Using The Impact-Echo Technique, Hemant S. Limaye, Sven E. Thomasen

Review of Progress in Quantitative Nondestructive Evaluation

The impact-echo technique involves introducing mechanical energy, in the form of a short pulse, into a structure. A transducer mounted on the surface of the structure receives the reflected waves, or echoes, from discontinuities in the material and measures motions created by the impact in the time domain. The predominant frequency is read by an FFT Analyzer, and the propagation velocity, which is a function of the frequency and the travel distance through the specimen, is calculated. After the particular relationship between propagation velocity and compressive concrete strength is established from the testing of concrete cores, the mean strength of ...


Radar Inspection Of Concrete, Brick And Masonry Structures, C. P. Hobbs, J. A. G. Temple Jan 1993

Radar Inspection Of Concrete, Brick And Masonry Structures, C. P. Hobbs, J. A. G. Temple

Review of Progress in Quantitative Nondestructive Evaluation

Seismic radar was introduced as a geophysical tool for mineral exploration in the 1970’s. Since then, there have been several attempts to use the technique to assess civil engineering structures. For example: Bridge decks and masonry tunnels [1, 2], concrete [3], bridge decks overlaid with asphalt [4,5], concrete and masonry tunnels [6], detection of voids under jointed concrete paving [7], location of piles under an old concrete floor [8] and the location of leaks in underground pipes [9]. These few references are not intended to be a comprehensive survey, but do indicate the variety of problems for which ...


Nondestructive Evaluation Of Wood Using Ultrasonic Dry-Coupled Transducers, Udaya B. Halabe, Hota V. S. Gangarao Jan 1993

Nondestructive Evaluation Of Wood Using Ultrasonic Dry-Coupled Transducers, Udaya B. Halabe, Hota V. S. Gangarao

Review of Progress in Quantitative Nondestructive Evaluation

The nondestructive evaluation of wood is of considerable importance in several structural applications such as wooden bridge decks, wooden structural components, and wooden railway ties. This problem has attracted the attention of several researchers [1–19]. The specific topics that are being considered include: detection of natural defects like bacterial growth, knots, and splits; grading of wood; estimation of strength and stiffness characteristics; assessment of the effect of chemical treatment on strength; and, in-situ evaluation of degradation in wooden structural components and railway ties. Ultrasonic techniques have achieved a reasonable amount of success in the estimation of structural properties and ...


Nondestructive Evaluation Of Hardwood Logs Using Automated Interpretation Of Ct Images, Daniel L. Schmoldt, Dongping Zhu, Richard W. Conners Jan 1993

Nondestructive Evaluation Of Hardwood Logs Using Automated Interpretation Of Ct Images, Daniel L. Schmoldt, Dongping Zhu, Richard W. Conners

Review of Progress in Quantitative Nondestructive Evaluation

Knowledge of internal defects within hardwood logs can be useful even prior to a log’s entry into the sawmill. It is in the log yard where the first important decisions are made about processing. First, based upon perceived quality, logs may be sorted as veneer logs or as high-quality sawlogs and sold to domestic veneer mills or for export. Second, roundwood may be bucked into smaller logs to isolate defect areas and to obtain sawlogs with longer sections of clear wood. And third, logs containing metal objects can be identified, thereby preventing headrig saw damage and costly mill down-time.


Use Of A Portable Linear Accelerator To Radiograph A Bridge Drainage Pump, Richard S. Newell, Philip J. Stolarski Jan 1993

Use Of A Portable Linear Accelerator To Radiograph A Bridge Drainage Pump, Richard S. Newell, Philip J. Stolarski

Review of Progress in Quantitative Nondestructive Evaluation

Many freeways in California have storm water pumping plants located near a bridge structure to de-water depressed sections of the freeway. The Ravenswood Slough Pumping Plant is located near the Dumbarton Bridge, which links southern Alameda County on the east to San Mateo County on the west (an 8,600 foot long structure, which carries over 50,000 vehicles daily). This pumping plant is the largest state- maintained pumping facility and drains all storm water into the San Francisco Bay for the City of Menlo Park.


Inverse Modeling To Obtain Air Permeabilities From Multiple Well Field Tests In Unsaturated Weathered Till , Kenneth Brophy Edwards Jan 1993

Inverse Modeling To Obtain Air Permeabilities From Multiple Well Field Tests In Unsaturated Weathered Till , Kenneth Brophy Edwards

Retrospective Theses and Dissertations

Soil vapor extraction (SVE) to remove volatile contaminants from contaminated soil in the unsaturated zone has been successful in sand and gravel formations. In less permeable glacial till, the usefulness of SVE is unclear;A field experiment in the loam till of central Iowa (U.S.A.) was performed to determine air permeabilities in-situ at an uncontaminated site. Air permeability is a key design parameter for SVE systems and is one indicator of its feasibility. Vertical wells and tensiometers were installed in the vadose zone. The wells were installed at distances up to 100 cm from a central air extraction ...


Remote Robot Manipulator Coupled With Remote-Controlled Guide Vehicle For Soil Sampling In Hazardous Waste Sites , Kiho Kim Jan 1993

Remote Robot Manipulator Coupled With Remote-Controlled Guide Vehicle For Soil Sampling In Hazardous Waste Sites , Kiho Kim

Retrospective Theses and Dissertations

The important initial step for remediation of hazardous waste is contaminant analysis since the cleanup operation can not begin until the contaminants in hazardous waste sites have been clearly identified. Ames Laboratory, one of the U.S. Department of Energy sites, has developed a robotic sampling system for automation of real-time contaminant analysis in situ which will provide the advantage of lowering the cost per sample, eliminating personnel exposure to hazardous environments, and allowing quicker results. Successful accomplishment of real-time contaminant analysis will require a remote manipulator to perform the sampling tasks in remote and unstructured surroundings, and a remote-controlled ...


Numerical Simulation Of Two And Three-Dimensional Viscous Free Surface Flows In Partially-Filled Containers Using A Surface Capturing Approach , Franklyn Joseph Kelecy Jan 1993

Numerical Simulation Of Two And Three-Dimensional Viscous Free Surface Flows In Partially-Filled Containers Using A Surface Capturing Approach , Franklyn Joseph Kelecy

Retrospective Theses and Dissertations

A new surface capturing method is developed for numerically simulating viscous free surface flows in partially-filled containers. The method is based on the idea that the flow of two immiscible fluids (specifically, a liquid and a gas) within a closed container is governed by the equations of motion for a laminar, incompressible, viscous, nonhomogeneous (variable density) fluid. By computing the flowfields in both the liquid and gas regions in a consistent manner, the free surface can be captured as a discontinuity in the density field, thereby eliminating the need for special free surface tracking procedures;The numerical algorithm is developed ...