Index Catalog // ScholarsArchive@OSU

Response of guyed offshore towers to stochastic loads in the presence of steady current

Creator:: Brynjolfsson, Sigurdur
Abstract:: The validity of the widely used stochastic linearization method for analysing the response of guyed towers to stochastic loads is investigated. The governing equations of a guyed tower have two main sources of nonlinearities, fluid-structure interaction and the restoring force of the cables. In this study, two models are considered....
Resource Type:: Dissertation
Full Text:: . Robert E. Wilson and Charles E. Smith for their advice and encouragement during the course of this work

Drilling process evaluation by predicting drilled hole quality and drill bit wear with on-line acoustic emission signals

Creator:: Wang, Kuang-Jen, 1962-
Abstract:: Improvement of manufacturing productivity is dependent on the successful automation of manufacturing processes, the success of which is based in turn upon the availability of information which describes the state of manufacturing operations. Acoustic Emission (AE) signals related to the cutting process and tool wear have been recently applied to...
Resource Type:: Dissertation
Full Text:: . Abstract approved: Robert K. Paasch Improvement of manufacturing productivity is dependent on the

Wind turbulence input model for horizontal axis wind turbines

Creator:: Lin, Shuh-ren
Abstract:: In order to estimate wind turbine residL2;characteristics in the presence of atmospheric turbulence, the important atmospheric sources for the force excitations felt by the wind turbine system must be identified and characterized. The goal of this research is to develop the wind turbulence input model for horizontal axis wind turbines....
Resource Type:: Dissertation
Full Text:: Abstract approved: Redacted for privacy Dr. William E`: -- ;Holley!{ In order to estimate wind turbine

Distortion-induced fatigue cracking of girder-to-crossbeam connection

Creator:: Aljutaili, Dhari S.
Abstract:: Oregon Department of Transportation’s bridge no. 9743b is a multi-span, two-girder steel deck bridge connecting the busy interstates 5 and 205. Vertical cracks have been detected in the welded girder-to-crossbeam connections at the bents. Distortion-induced fatigue is suspected to be responsible for the cracking. Linear elastic beam analysis, 2-D and...
Resource Type:: Masters Thesis
Full Text:: -to-Crossbeam Connection. Abstract approved: Robert K. Paasch Oregon

Vehicle dynamic validation and analysis from suspension forces

Creator:: Murray, William S.
Abstract:: Several standardized courses for Formula SAE (FSAE) testing are introduced and described with sufficient detail to be reproduced by any Formula SAE team. Basic analysis methods for the courses are given as well as explanations of how those analyses could be used. On-car data from the Global Formula Racing (GFR)...
Resource Type:: Masters Thesis
Full Text:: : Robert K. Paasch Several standardized courses for Formula SAE (FSAE) testing are introduced and

Derivation and automatic generation of Kane's dynamical equations for mechanical manipulators

Creator:: Nie, Tinglin
Abstract:: To design and precisely control a manipulator requires developing an efficient dynamic model of the system. The present work demonstrates how this can be accomplished by employing Kane's dynamical equations. First, a detailed manual derivation of the equations of motion for a particular robot is presented in such way that...
Resource Type:: Dissertation
Full Text:: . Appreciation is also extended to the members of my Ph.D committee, Dr. Robert E. Wilson, Dr. Timothy C

Nonlinear adaptive control of highly maneuverable high performance aircraft

Creator:: Cho, Sul
Abstract:: This thesis presents an effective control design methodology using a one-step-ahead prediction adaptive control law and an adaptive control law based on a Lyapunov function. These control law were applied to a highly maneuverable high performance aircraft, in particular, a modified F/A-18. An adaptive controller is developed to maneuver an...
Resource Type:: Dissertation
Full Text:: my committee members, Dr. W. Kolodziej, Dr. Timothy C. Kennedy, Dr. Robert E. Wilson, and Dr

Smooth and roughened horizontal cylinders in periodic waves and current

Creator:: Teng, Chung-chu
Resource Type:: Dissertation
Full Text:: . Timothy C. Kennedy; and Dr. Philip E. Humphrey. During his graduate studies, the author received

Stochastic analysis of a nonlinear ocean structural system

Creator:: Lin, Huan
Abstract:: Stochastic analysis procedures have been recently applied to analyze nonlinear dynamical systems. In this study, nonlinear responses, stochastic and/or chaotic, are examined and interpreted from a probabilistic perspective. A multi-point-moored ocean structural system under regular and irregular wave excitations is analytically examined via a generalized stochastic Melnikov function and Markov...
Resource Type:: Dissertation
Full Text:: , Prof. Ron B. Guenther, Prof. Alan G. Hernried, Prof. Charles E. Smith, and Prof. Timothy C. Kennedy

Direct coupling of imaging to morphology-based numerical modeling as a tool for mechanics analysis of wood plastic composites

Creator:: Lin, Xiang
Abstract:: Polymeric composites reinforced with bio-materials have advantages over composites with synthetic reinforcements. Bio-based composites use low-cost and renewable reinforcements, have nonabrasive properties for machining, have improved damping characteristics, and have potential for energy recycling. However, the limited use of bio-based composites is because their mechanical properties are typically much lower...
Resource Type:: Masters Thesis

Mechanical linkage design for haptic rehabilitation and development of fine motor skills

Creator:: Streng, B. Taylor
Abstract:: Thousands of children and adults suffer from fine motor skill deficits due to developmental disabilities or brain trauma. In order to acquire or reclaim these precision motor movements, occupational therapists work closely with each patient to develop the muscle memory required for completing tasks such as handwriting or drawing. Although...
Resource Type:: Masters Thesis
Full Text:: 3.1 A simple “E” was created using X3D and H3D API during initial prototyping

Large-strain softening of aluminum in shear at elevated temperature

Creator:: Alhajeri, Saleh N.
Abstract:: Pure aluminum deformed in torsion (shear) at elevated temperatures reaches a broad "peak" stress and then undergoes about a 17% decrease in flow stress with deformation to roughly 1-2 equivalent uniaxial strain. Beyond this strain the flow stress is approximately constant. The sources for this softening are unclear. The suggested...
Resource Type:: Masters Thesis
Full Text:: Softening of Aluminum in Shear at Elevated Temperature. Abstract approved: Michael E. Kassner Pure

Experimental and analytical investigation of ponding load effects on a steel joist roof system

Creator:: Stark, Duncan
Abstract:: Ponding of water on roof systems leading to collapse causes expensive damage and jeopardizes the life safety of building occupants. Current building codes and design specifications for flat roof systems offer minimal guidance in designing for ponding loads. The present research investigated ponding load effects on a long span, lightweight...
Resource Type:: Masters Thesis
Full Text:: skills, and Professor Robert Schultz lent equipment. The completion of the lab work for this

Design of a mechanically assisted dependent transfer mechanism for use on board commercial aircraft

Creator:: Gibson, Brenton D.
Abstract:: Business and recreation in the modern day world often include air travel as their cornerstone. Travelers who are disabled and wheelchair bound have to undergo a transfer process to board and deplane a commercial aircraft. This transfer process is typically done manually, with agents physically lifting the passenger who is...
Resource Type:: Masters Thesis
Full Text:: Dr. Robert Paasch. They have been an encouragement and inspiration to me for continuing my

Mechanics of Nb-Ti superconducting composites

Creator:: Guo, Zhiqiang
Abstract:: Mechanical behavior of Nb-Ti superconducting composites with copper matrices have been studied experimentally and theoretically. Experimental work includes extensive measurements of Cu/Nb-Ti composite system. Techniques for fine fiber testing and composite wire measurement have been developed. Experimental parameters examined in this research include geometry, hardness, Young's modulus, Poisson's ratio, yield...
Resource Type:: Dissertation
Full Text:: Peterson, Timothy C. Kennedy, E. G. Wolff, and Dan Schafer for their kind advices and encouragements as

Mechanical characterization of a simple gel in a prototype device that models a degenerative intervertebral disc

Creator:: Cenar, Yannick
Abstract:: A large part of low-back pain occurrences are due to disc herniation or prolapse of the nucleus pulposus. An alternative technique to existing treatments of low back pain includes nucleus pulposus replacement by an artificial material to relieve pain and restore normal function. To date, there has been a deficiency...
Resource Type:: Masters Thesis

Evaluating the effectiveness of interaction strategies between product developer and supply chain using activity based modeling in environmental benign product design

Creator:: Wang, Bo
Abstract:: With growing concerns on environment impact of industrial product development, the product developers are seeking better solutions to achieve desired environmental benign requirements by the regulators and customers besides economic growth. During the last decade, some of the most successful product development companies (such as HP) have established their own...
Resource Type:: Masters Thesis
Full Text:: measure its impact on Environmental Impact (E), Quality (Q), and Cost (C), of developing a product. In

An experimental study of natural convection from protruding arrays on a vertical plate with and without an opposing wall for various fluids

Creator:: Lin, Peng-cheng
Resource Type:: Dissertation
Full Text:: like to extend my appreciation to Professor Robert E. Wilson for his treatise in fluid mechanics and

Cooling rate limitations in the diffusion bonding of large microchannel arrays

Creator:: Lingam, Gopi K.
Abstract:: A significant barrier to the diffusion bonding of large (i.e. 600 mm) microchannel devices is the large capital investment required to setup production. This large capital investment extends from long heating and cooling cycles leading to poor production capacities. Empirical studies in industry have shown that cooling rate is limited...
Resource Type:: Masters Thesis
Full Text:: would like to specially thank Dr. Timothy Kennedy for being my minor professor in Mechanical

The application of a band variable-inertia flywheel to an urban transit bus

Creator:: Moosavi-Rad, Hamid
Abstract:: This dissertation investigates by means of computer simulation the potential of a Band Variable-Inertia Flywheel (BVIF) to store energy for an urban transit bus. Replacing both a fixed-inertia flywheel (FIF) and a continuously variable transmission (CVT), the Band Variable-Inertia Flywheel is capable of accelerating a vehicle from rest to a...
Resource Type:: Dissertation
Full Text:: Professor Charles E. Smith for his support and assistance in this project; and Professors Timothy C

Quality driven collaborative decision making for product development under the influence of trustworthiness

Creator:: Meier, Stefan
Abstract:: The focus of this study is the effective prioritization of customer requirements in collaborative product development. The CR priorities are often retrieved by questioning and interviewing targeted customers. But the targeted customer might not always be easily questioned, because they might not always be obvious or clearly known. If customers...
Resource Type:: Masters Thesis
Full Text:: this thesis. The author also thanks Dr. Timothy C. Kennedy and Dr. Michael H. Freilich, who both

Robust controller design for robotic manipulators with saturation

Creator:: Liang, Zuyang
Abstract:: The development of modern industries calls for the robotic manipulators with high speed and accurate tracking performance. Many authors have paid attention to robust control of robotic manipulators; however, only few authors have also considered the control problem of manipulators with power limitation. In this dissertation, the robotic manipulator is...
Resource Type:: Dissertation
Full Text:: . Charles E. Smith, Prof. Timothy C. Kennedy, Prof. Alan H. Robinson and Prof. David G. Ullman for their

Numerical study of natural convection in square partitioned and non-partitioned enclosures

Creator:: Sukkaset, Prasart
Abstract:: Heat transfer characteristics and associated temperature and flow fields for natural convection in two-dimensional, square, partitioned and non-partitioned enclosures have been determined for Grashof numbers ranging from 10³ to 10⁶. The vertical side walls of the enclosure are isothermal with all other surfaces assumed to be adiabatic. An adiabatic partition...
Resource Type:: Dissertation
Full Text:: , Professor Charles E. Smith, Professor Timothy C. Kennedy and Professor Harold I. Laursen, for their time

Design, analysis and evaluation of bridge superstructures for live loads

Creator:: Turan, O. Tugrul
Abstract:: Due to age, original design that is deficient by modern standards, inadequate maintenance, environmental conditions, and increasing loads, large numbers of bridges in United States and elsewhere are classified as deficient and in need of rehabilitation or replacement. According to a national bridge inventory established by the Federal Highway Administration,...
Resource Type:: Dissertation
Full Text:: Kennedy, Dr. Michael Scott, and Dr. Donald C. Solmon for their helpful comments and feedback. I

Creep of Gr/BMI composite laminates in compression

Creator:: Tyagi, Sanjeev R.
Abstract:: The main source of the time-dependent behavior of fiber-reinforced composites is their polymeric matrix, which causes concerns about their long term durability. Although for composites where organic fibers such as Graphite are used, the fibers are also a contributing factor. A composite material may exhibit an appreciable amount of creep,...
Resource Type:: Masters Thesis
Full Text:: program. I would like to thank Dr. Timothy C. Kennedy, Dr. David G. Ullman and Dr. Rasaratnam Logendran

3-D finite element modeling in OpenSees for bridge live-load girder distribution factors

Creator:: Scoggins, Luke A.
Abstract:: A generalized, three-dimensional, finite element bridge model was created in order to efficiently and accurately assess live-load girder distribution factors for a variety of bridge types. This model shortens the time required by bridge analysts to develop individual finite element models for bridges of varying geometries. The creation of the...
Resource Type:: Masters Thesis
Full Text:: . scalelog. scalelog. scalelog. scale V e rt . R e a c ti o n ( k N ) V e rt . R e a c ti o n

On the lyapunov-based approach to robustness bounds

Creator:: Jo, Jang Hyen
Abstract:: The objective of this investigation is the development of improved techniques for the estimation of robustness for dynamic systems with structured uncertainties, a problem which was approached by application of the Lyapunov direct method. This thesis considers the sign properties of the Lyapunov function derivative integrated along finite intervals of...
Resource Type:: Dissertation
Full Text:: to thank Dr. Charles E. Smith for the impressive courses he offered in my major field of study and

Parametric uncertainties in reliability analysis of bridge structures

Creator:: Hamutcuoglu, Osman Murat
Abstract:: Probability-based reliability methods have placed an increased emphasis on realistic simulation of structural behavior in bridge engineering. Uncertainty is present in every aspect of structural analysis. Aleatory uncertainties in the loading and load-carrying capacities, and epistemic uncertainties in mathematical idealization of bridge systems are the major contributors to uncertain structural...
Resource Type:: Dissertation
Full Text:: committee members: Dr. Christopher Higgins, Dr. Timothy Kennedy, Dr. Irem Tumer and Dr. Peter Ruggiero for

Residual strength properties of Gr/BMI composite laminates after constant/cyclic compression

Creator:: Shenoy, Krishnananda
Resource Type:: Masters Thesis
Full Text:: would like to thank Dr. Timothy C. Kennedy, Dr. Jun Koike and Dr. Stephen W. Hoag for their time and

Image rectification tool for evaluation of gusset plate connections in steel truss bridges

Creator:: Nguyen, Quang D.
Abstract:: A methodology was developed to permit rectification and metrification of digital images of steel truss gusset plate connections. The approach will enable rapid and accurate collection of field measurements as compared to traditional methods to enable structural evaluation of gusset plate connections. The program enables the operator to quickly create...
Resource Type:: Masters Thesis
Full Text:: number of control points; and as: n 2 i i=1 1σ = (e -e) n∑ (5) where ei is the location

Behavior of gypsum-sheathed cold-formed steel wall stud panels

Creator:: Lee, Young-ki
Abstract:: This study consists of three parts: 1) Part A: Limiting Height Evaluation for Composite Wall Tests, 2) Part B: Mid-Span Deflection Evaluation for Composite Wall Tests, and 3) Part C: Nominal Axial Strength Evaluation for Wall-Braced Wall Stud Columns. The purpose of Part A is to develop experimentally-based limiting heights...
Resource Type:: Dissertation
Full Text:: . Testing for the composite wall tests complies with ICBO ES AC86 and ASTM E 72-80 using a uniform, vacuum

Transient nonlinear deformations of viscoelastic membranes

Creator:: Jenkins, Christopher H. M.
Resource Type:: Dissertation
Full Text:: . Kennedy, and Dr. Roy C. Rathja - each has remained both mentor and friend. Thanks also to Dr. Solomon C.S

Processing of laser interferometric signals for small displacement measurements

Creator:: Peng, Gwo-sheng
Abstract:: Algorithms for analyzing laser interferometry signals were developed and adopted to the computer based processing of small displacement measurements. These methods, matrix operation approach and fixed parameters approach, are based on signal phase calculation and are able to replace complex fringe counting electronic circuits. The matrix operation provides an approach...
Resource Type:: Dissertation
Full Text:: . Thomas K. Plant, Dr. Timothy C. Kennedy and Dr. William H. Warnes for reviewing the dissertation and

A composite-beam finite element for seismic analysis of wood-framed buildings

Creator:: Lee, Chyuan-shen
Abstract:: A computer program called SAPWOOD which possesses the capability of performing linear or nonlinear, static or dynamic response including seismic excitation for wood-framed buildings with semirigid connection systems is presented in this study. Program SAPWOOD is a modification of the program NONSAP by adding new elements such as a linkage...
Resource Type:: Dissertation
Full Text:: Peterson, Dr. Anton Polensek, Dr. Timothy C. Kennedy, Dr. Ronald B. Guenther and Dr. Julian Sessions for

A study of compression loading of composite laminates

Creator:: Berbinau, Pierre J.
Abstract:: The compressive behavior of continuous fiber composites is not as well understood as their tensile behavior because research and industrial applications have until recently focused on the latter. Furthermore, most theoretical and experimental studies on the compression of composites have examined the case of unidirectional specimens with fibers along the...
Resource Type:: Dissertation
Full Text:: and analytical research skills. I would also like to thank Drs. Timothy C. Kennedy, William H

Application of controlled thermal expansion in diffusion bonding for the high-volume microlamination of MECS devices

Creator:: Pluess, Christoph
Abstract:: Diffusion bonding has been widely used within microlamination architectures for the fabrication of Micro Energy and Chemical Systems (MECS). MECS are microsystems with the ability to process bulk amounts of fluid within highly-parallel microchannel arrays capable of accelerated heat and mass transfer. Thus far, diffusion bonding of the microchannel arrays...
Resource Type:: Masters Thesis
Full Text:: committee members Dr. Sundar V. Atre, Dr. Kevin M. Drost, Dr. Timothy C. Kennedy and Dr. Zhaohui Wu for

Nonlinear hydrodynamic response of curved singly-connected cables

Creator:: Chiou, Rueybin
Resource Type:: Dissertation
Full Text:: . Ronald B. Guenther, Dr. Timothy C. Kennedy and Dr. David R. Thomas for their participation as Graduate

Selection and performance evaluation of a test method to assess thermal cracking resistance of asphalt-aggregate mixtures

Creator:: Jung, Duhwoe
Abstract:: Thermal distress in asphalt concrete pavements is a widespread problem around the world. Thermal cracking can be divided into two modes of distress: low temperature cracking and thermal fatigue cracking. Low temperature cracking results from extremely cold temperatures; thermal fatigue cracking results from daily temperature cycles. Low temperature cracking is...
Resource Type:: Dissertation
Full Text:: Assess Thermal Cracking Resistance of Asphalt-Aggregate Mixtures AN ABSTRACT OF TH,E THESIS OF Duhwoe

Experimental and analytical evaluation of conventionally reinforced deck-girder bridge bent caps with vintage details

Creator:: Senturk, Ahmet Ekin
Abstract:: Many conventionally reinforced concrete deck girder (RCDG) bridges were built in the US during the 1950s, throughout the expansion of the Interstate System. Designs followed the AASHO standard of the time, which permitted higher shear stress in concrete and reduced detailing requirements than permitted by current specifications. Many of these...
Resource Type:: Dissertation
Full Text:: . John Gambatese, Dr. Timothy Kennedy, and Dr. Michael Scott. Conducting large scale experiments

Three-dimensional experiments and modeling of anisotropic clay

Creator:: Anantanasakul, Pongpipat
Abstract:: This dissertation presents the results of a research effort conducted to better understand the stress-strain, volume change, shear band formation, and strength characteristics of normally consolidated anisotropic clay under fully three-dimensional stress states. A series of consolidated drained true triaxial tests with a constant mean effective stress and constant Lode...
Resource Type:: Dissertation
Full Text:: . Scott of the School of Civil and Construction Engineering, and Dr. Timothy C. Kennedy of the School of

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