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Full-Text Articles in Engineering

An Investigation Of Turbulent Taylor-Couette Flow Using Laser Doppler Velocimetry In A Refractive Index Matched Facility, Joseph C. Parker Dec 1995

An Investigation Of Turbulent Taylor-Couette Flow Using Laser Doppler Velocimetry In A Refractive Index Matched Facility, Joseph C. Parker

Master's Theses

Turbulent Taylor-Couette flow between an annulus formed by two concentric cylinders with dead end walls is comprised of complex patterns of vortices. An experimental apparatus was designed to provide refractive index matching between the annulus and working fluid. Optical access was maintained through three sides of the annulus and one end wall. An aqueous solution of sodium iodide was formulated to match the refractive index of the Plexiglas annulus. Laser Doppler Velocimetry was used to measure the three components of velocity and turbulence intensity throughout a planar section in the annulus. The annulus dimensions were: ƞ= 0.672, d = 15 ...


The Effect Of Rotor Wake/Exit Guide Vane Interaction On The Total Pressure Losses In An Airfoil Cascade, Aaron Mosebach Dec 1995

The Effect Of Rotor Wake/Exit Guide Vane Interaction On The Total Pressure Losses In An Airfoil Cascade, Aaron Mosebach

Master's Theses

Computational simulations have been performed to study the effects of unsteady rotor wakes on the total pressure losses and the boundary layer characteristics in a compressor cascade. In the numerical simulations, transitional and turbulent flow conditions were modeled at design and off-design inlet flow angles, and for varying rotor wake widths and wake velocity deficits.

First, simulations were performed in the absence of rotor wakes at the inlet of the EGV (Exit Guide Vane) cascade. Second, simulations were performed for different wake width and wake velocity deficit values at the inlet of the EGV cascade. The majority of the numerical ...


Cumulative Average Pricing Method For Estimating Average Service Life, Mahendra Babu Hosangadi Dec 1995

Cumulative Average Pricing Method For Estimating Average Service Life, Mahendra Babu Hosangadi

Master's Theses

The study determined if accuracy of estimation of retirement price of industrial equipment was affected by using a cumulative average pricing (CAP) method at varying conditions of inflation rate, service life, and life characteristics. The study also determined the accuracy of estimating the average life of unaged data by simulated plant record (SPR) method. Thirty-six experiments were conducted at varying conditions of inflation rate, curve type and average life. The study was conducted for two left modal curves, two symmetrical modal curves and two right modal curves at 20 and 40 years average life using three different inflation rates: 3 ...


A Study On The Causes Of Variations In Transmissivity And Storativity During Pump Tests At Asylum Lake, Paul Joseph Pare Dec 1995

A Study On The Causes Of Variations In Transmissivity And Storativity During Pump Tests At Asylum Lake, Paul Joseph Pare

Master's Theses

Over a two year period, Western Michigan University ran a number of pump tests in the Asylum Lake Area in Kalamazoo, Michigan. The transmissivities and storativities calculated from these tests differed significantly from well to well in any particular test, and from pump test to pump test. Utilizing the computer programs AQTESOLV 3.0 and Aquifer Parameter Estimator, a number of T and S values were calculated. After analysis of the results, the following conclusion was drawn. The main reason for the deviations in the T and S values arose from the mixing of the results of numerous methods (some ...


Dynamic Pulse Buckling Of Columns With Viscous Damping, Murli Kadandale Dec 1995

Dynamic Pulse Buckling Of Columns With Viscous Damping, Murli Kadandale

Master's Theses

This is a study of dynamic pulse buckling of columns with viscous damping. The differential equations of motion were obtained using the Bemoulli-Navier hypothesis. The effects of axial and rotary inertia were included in the analysis. The Voigt-Kelvin model for a viscoelastic material is used. The Finite Difference Method was employed to solve the differential equations of motion. First columns without geometrical imperfections were studied, and a correlation between the damping modulus and the more familiar damping ratio was obtained. Then beams with initial geometrical imperfection were studied. A suitable dynamic buckling criterion was defined. It was observed that viscous ...


Addition Of Automatic Dimensioning Feature To D-M-E’S Ultimate Mold Base Design Software, Cori L. Brown Aug 1995

Addition Of Automatic Dimensioning Feature To D-M-E’S Ultimate Mold Base Design Software, Cori L. Brown

Master's Theses

There have been many improvements in the plastics industry over the past few years. One of these areas is in the design of injection molds. This area has been enhanced by the use of Computer-Aided Design systems and furthered by the creation of specialized mold design software. The Ultimate® design system from D-M-E has made a mold designer's job much easier by automating much of this process. This project extends the function of this software by adding an automatic dimensioning feature that will make the mold design process less tedious and less time consuming. This addition will also standardize ...


Development Of A Mold Trial Procedure For Establishing A Robust Process, Marc R. Vander Kooi Aug 1995

Development Of A Mold Trial Procedure For Establishing A Robust Process, Marc R. Vander Kooi

Master's Theses

To reduce variation in the injection molding process it is essential to understand the effect of process, mold, and material variables on critical part characteristics. Gaining a thorough understanding of these variables is often difficult due to the limited time manufacturers typically have available for mold trials. To address this issue, the Premier Class Injection Molding consortium (PCIM) has performed numerous experiments relating to shot-to-shot repeatability. Using the PCIM data set and experimentation procedures as a base, a procedure was developed to collect data during a mold trial. Incorporating small experiments and statistical analysis, the new procedure allows meaningful data ...


A Comparative Study Of The Stress Concentration Factors Arising Between Two Equal, Nearly Intersecting, Perpendicular, Pressurized Holes In An Infinite Solid With Those Arising Due To An Infinite Series Of Such Holes, Paul J. Drogowski Jun 1995

A Comparative Study Of The Stress Concentration Factors Arising Between Two Equal, Nearly Intersecting, Perpendicular, Pressurized Holes In An Infinite Solid With Those Arising Due To An Infinite Series Of Such Holes, Paul J. Drogowski

Master's Theses

Finite element analysis is used to determine the stress concentration factors arising from two equal, perpendicular, nearly intersecting, pressurized holes in an infinite solid while varying the distance and pressure ratios between the holes. The results are compared and contrasted with those previously obtained for an infinite series of such holes. A ratio of the distance between the holes to the diameter of the holes at which the holes can be considered to be single holes in an infinite solid is determined. A study is performed to determine a correlation between the location of the region of maximum stress and ...


Modeling And Development Of A Cellular Micro-Kernel, K. Balaji Jun 1995

Modeling And Development Of A Cellular Micro-Kernel, K. Balaji

Master's Theses

A novel cellular load distribution strategy was designed and implemented on transputers by Dr. Richard Taylor and Dr. Don Goodeve at the University of York, United Kingdom. Based upon the above proposed strategy, a statistical model was developed using the Cellular Automata Theory. The theoretical model drives the implementation process of the cellular micro-kernel on the nCUBE 2S system. The load distribution and the performance characteristics for snake and L type transmission modes, and for uniform and non-uniform distribution of destination processors of the micro-kernel has been measured and compared with our theoretical model. The results show good agreement between ...


Hardware/Software Codesign And Simulation With The Occam Programming Language, Roy L. Krans Apr 1995

Hardware/Software Codesign And Simulation With The Occam Programming Language, Roy L. Krans

Master's Theses

Hardware/software codesign is an increasingly popular method for improving system performance and adaptability while minimizing cost. The goal of this design approach is to achieve the desired system characteristics (performance, fault tolerance, cost, power consumption, etc.) by carefully distributing the system functions among hardware and software components. Popular tools for describing this dual hardware/software functionality are behavioral languages such as C++ and Ada. These languages typically include facilities for both traditional sequential programming as well as behavioral modeling.

This thesis examines the effectiveness of occam as a behavioral language and its role in hardware/software codesign. The occam ...