Engineering Commons^™

Understanding Travel Modes To Non-Work Destinations: Analysis Of An Establishment Survey In Portland, Oregon, Christopher D. Muhs

Dissertations and Theses

During the past three decades, research in travel behavior has generally proceeded from broad-level, aggregate analysis of mode share--the proportions of walking, bicycling, transit, and vehicle travel occurring in traffic analysis zones, census tracts, neighborhood, or other geographical units--to fine-grained, disaggregate analysis of mode choices and other trip-making attributes at the individual level. One potential issue is whether there are differences in the types of conclusions drawn from results of analyses performed at these different levels, as these results directly inform transportation planning and policy.

This thesis aims in part to confirm whether the types of conclusions drawn from different …

High-Speed Imaging Of A Bulk Metallic Glass During Uniaxial Compression, Wendelin Wright, Rachel R. Byer, Xiaojun Gu

Faculty Journal Articles

High-speed imaging directly correlates the propagation of a particular shear band with mechanical measurements during uniaxial compression of a bulk metallic glass. Imaging shows shear occurs simultaneously over the entire shear plane, and load data, synced and time-stamped to the same clock as the camera, reveal that shear sliding is coincident with the load drop of each serration. Digital image correlation agrees with these results. These data demonstrate that shear band sliding occurs with velocities on the order of millimeters per second. Fracture occurs much more rapidly than the shear banding events, thereby readily leading to melting on fracture surfaces.

Compositional And Structural Properties Of Emulsion-Treated Base Material: 7800 South In West Jordan, Utah, Lisa Renay Gurney

Theses and Dissertations

The objectives of this research were 1) to examine correlations between compositional and structural properties of emulsion-treated base (ETB) layers, determine which of these factors exhibit the greatest spatial variability, and determine if significant differences exist between different test sections on a given project and 2) to investigate temporal trends in the structural properties of base materials treated with asphalt emulsion and to assess the rate at which ETB design properties are achieved. The research conducted in this study focused on testing of the ETB layer constructed on 7800 South (SR-48) in West Jordan, Utah. The research conducted in this …

Reliability-Based Design Optimization Of Concrete Flexural Members Reinforced With Ductile Frp Bars, Bashar Behnam, Christopher D. Eamon

Civil and Environmental Engineering Faculty Research Publications

In recent years, ductile hybrid FRP (DHFRP) bars have been developed for use as tensile reinforcement. However, initial material costs regain high, and it is difficult to simultaneously meet strength, stiffness, ductility, and reliability demands. In this study, a reliability-based design optimization (RBDO) is conducted to determine minimum cost DHFRP bar configurations while enforcing essential constraints. Applications for bridge decks and building beams are considered, with 2, 3, and 4-material bars. It was found that optimal bar configuration has little variation for the different applications, and that overall optimized bar cost decreased as the number of bar materials increased.

Microstructure And Mechanical Properties Of A Friction Stir Processed Ti-6al-4v Alloy, Jianqing Su, Jiye Wang, Rajiv S. Mishra, Ray Xu, John A. Baumann

Materials Science and Engineering Faculty Research & Creative Works

Friction stir processing (FSP) trials were performed on 2mm-thick Ti-6Al-4V sheets using various processing parameters including tool rotational speed (800-1000RPM) and tool traverse speed (1-4IPM). A processing window was established with the W-1% La₂O₃ tool to produce defect-free friction stir processed (FSP'd) materials. The stir zone (SZ) material of the FSP'd samples showed a fully Β transformed microstructure characterized by typical basket-weave lamellar α/Β structure. The prior Β grains in the SZs contained multiple α variants, and the average sizes ranged from 12μm to 38μm influenced by the processing parameters. Based on metallurgical evaluation, the microstructural evolution …

Evaluating The Effects Of Non-Anonymity On Student Team-Member Evaluations, Taylor Robert Smith

Theses and Dissertations

This thesis investigates the effect that non-anonymity has upon student team-member evaluations; more specifically, it looked at how to create conditions of openness and honesty in which students will readily give and receive constructive criticism. The central hypothesis of this research is that if students are taught and prepared to properly give and receive constructive criticism, and have multiple opportunities to do so, non-anonymous feedback is the most effective and desirable. In order to gauge the effects of non-anonymity, eight specific hypotheses relating to different aspects of the feedback process were tested. Predictions were made as to the effects upon …

Measuring Walkability: Development Of An Automated Sidewalk Quality Assessment Tool, Alexandra Frackelton, Alice Grossman, Evangelos Palinginis, Felipe Castrillon, Vetri Elango, Randall Guensler

Suburban Sustainability

Sidewalks are a critical part of sustainable transportation systems, supporting pedestrian travel and healthy physical activity. Presence and quality of sidewalks is a significant predictor of perceived safety and quality of the pedestrian environment. Lack of adequate pedestrian infrastructure data has been identified as a major barrier to large-scale pedestrian planning. Sidewalk presence, width, and surface condition are identified as important indicators of facility quality and accessibility. Georgia Tech is deploying an Android tablet application to automatically generate spatial sidewalk inventories, automatically assess sidewalk quality, and prioritize sidewalk repairs. The research team has collected field data on sidewalk segments across …

Scale-Up Of Bubble Column Reactors: A Review Of Current State-Of-The-Art, Ashfaq Shaikh, Muthanna H. Al-Dahhan

Chemical and Biochemical Engineering Faculty Research & Creative Works

In Multiphase Flow Reaction Systems, in General, an Extrapolation of Small Diameter Behavior to Larger Ones is Always an Important and Challenging Task. the Critical Issue in Such an Extrapolation Remains to Be Mixing and Hydrodynamic Characteristics. It Needs Reliable Similarity Criteria that Would Result in Similar Mixing and Hydrodynamics and Hence Transport and Performance in Two Different Scales. Numerous Experimental and Computational Studies Have Been Performed to Investigate the Flow Behavior of Bubble Column Reactors for a Proper Design and Scale-Up. Experimental Techniques Vary from Simple Visual Observation to More Advanced Noninvasive Diagnostic Techniques. on Computational Front the Progress …

Spatiotemporal Fluorescent Detection Measurements Using Embedded Waveguide Sensors, Mark C. Harrison, Andrea M. Armani

Engineering Faculty Articles and Research

Integrated waveguide biosensors, when combined with fluorescent labeling, have significantly impacted the field of biodetection. While there are numerous types of waveguide sensors, the fundamental excitation method is fairly consistent: the evanescent field of the waveguide excites a fluorophore whose emission is detected, either directly via imaging or indirectly via a decrease in power transfer. Recently, a sensor device was demonstrated which is able to back-couple the emitted light into the waveguide, allowing the signal to be detected directly. However, this previous work focused on the development of an empirical model, leaving many theoretical questions unanswered. Additionally, the results from …

Comparison Of Performance-Based Liquefaction Initiation Analyses Between Multiple Probabilistic Liquefaction Models Using The Standard Penetration Test, Alexander David Wright

Theses and Dissertations

For the most recent and correct article, please click here: http://ascelibrary.org/doi/abs/10.1061/9780784412787.086

This study examines the use of performance-based approaches in liquefaction hazard analysis. Two new methods of performance-based liquefaction initiation analysis are proposed which use the works of Juang et al. (2012) and Boulanger and Idriss (2012). Further advances are made by incorporating the performance-based magnitude scaling factors as proposed by Cetin et al. (2012). Using these new equations a comparative study is made between the three methods. Further comparisons are made between the performance-based approaches and the more widely used deterministic approaches. The comparisons reveal that on average for …

A Study Of Energy Saving Control Strategy For An Integrated Environment Control System Applied To Ship Hull Painting, Tzong-Shing Lee, Li-Wen Chang, Yew-Khoy Chuah

Journal of Marine Science and Technology–Taiwan

An integrated environment control system (IECS) is proposed to satisfy the requirements of IMO (International Maritime Organization) for ship hull painting. The IECS has four elements for environment control, namely, desiccant dehumidification, heating, cooling, and ventilation. Five operating modes are proposed, with each operating mode consists of one to more elements in the IECS system. Energy saving operating mode is selected based on the weather conditions and the conditions of painting work. Energy saving control strategy is applied to each operating mode. Theoretical energy models of the different operation modes are presented, along with the control schemes for the annual …

The Influence Of Mixture Variables For The Alkali-Activated Slag Concrete On The Properties Of Concrete, Chi-Che Hung, Jiang-Jhy Chang

Journal of Marine Science and Technology–Taiwan

In this study, the influence of three mixture variables named Sand/Aggregate ratio, Liquid/Binder ratio and Paste/Aggregate ratio on the concrete properties were studied. The properties of fresh concrete including the slump, air content and unit weight were examined. In addition, the mechanical properties such as the compressive strength, elastic modulus and splitting tensile strength were studied. Results showed that the alkaliactivated slag concrete has superior strength. The 28-day compressive strength can reach 80% of the 90-day compressive strength. In addition, the influence of the Liquid/Binder ratio on the 28-day compressive strength is not as apparent as the water/cement ratio is …

Numerical Investigation On The Effects Of Wave Grouping On The Motion Of Moored Ddms Platform, Xing-Gang Wang, Zhao-Chen Sun, Shu-Xiu Liang, Si Liu, Shu-Xue Liu, Jun-Bin Luo

Journal of Marine Science and Technology–Taiwan

The random wave groups with the same wave parameters, such as significant wave height, period and overshoot parameter, but with different wave groupiness are simulated by an empirical wave envelope spectrum involved the group height factor GFH and group length factor GLF based on field measured sea waves. A geometrically nonlinear finite element method based on the total Lagrangian formulation is developed to calculate the mooring-line dynamics. Coupled dynamic analysis of DDMS (Deep Draft Multi-Spar) platform and the attached mooring lines under the action of wave groups with different groupiness in deep water is executed in time domain. The effects …

The Experimental Study On Local Scour Around A Circular Pipe Undergoing Vortex-Induced Vibration In Steady Flow, Bing Yang, Tao Yang, Jian-Lin Ma, Jin-Sheng Cui

Journal of Marine Science and Technology–Taiwan

The local scour around a circular pipe undergoing vortexinduced vibration is investigated experimentally in a water flume. The typical characteristic of local scour is analyzed in detail. The influences of initial gap-to-diameter ratio (e0/D), the mode of pipe vibration and the sand type on the local scour are discussed. Experimental results indicate that there exists strong intensity of scour when the pipe moves close to the surface of the sandy bed. The vibration of the pipe results in the rapid development of sandy bed’s scouring. With the increase of gap-to-diameter ratio the distance between the center of the pipe and …

Shape Optimization Of Multi-Chamber Side Inlet/Outlet Mufflers Hybridized With Multiple Perforated Intruding Tubes Using A Genetic Algorithm, Min-Chie Chiu, Ying-Chun Chang

Journal of Marine Science and Technology–Taiwan

The use of perforated-tube side mufflers for depressing venting noise within a constrained space has been prevalent in modern industries. Also, research on mufflers equipped with side inlets/outlets has been thoroughly documented. However, research on shape optimization of side inlet/outlet mufflers hybridized with multiple open-ended perforated intruding tubes which may enhance acoustic performance has gone unnoticed. Therefore, we wish to not only analyze the sound transmission loss (STL) of side inlet/outlet mufflers but also to optimize their best design shape within a limited space. In this paper, the generalized decoupling technique and the plane wave theory used in solving the …

Design, Fabrication, And Analysis Of A 3u Cubesat Platform, Todd Chun-Van Osdol, Charles Dorsey, Jake Hedlund, Thomas Hoye, Owen Jacobs, Kadja Klarreich-Giglio, Elliott Martin, Michael Ruiz, Michael Schlesselmann, Zachary Singh

Mechanical Engineering Senior Theses

The goal of this project is to develop a 3U CubeSat nanosatellite bus capable of short duration technology verification experiments while providing compelling handson student education opportunities. This 3U CubeSat platform has been prototyped by the design team in order to demonstrate its capabilities. This spacecraft, the Unspecified Payload Active Attitude Control Nanosatellite (UPAACN), is designed to perform a 3-6 month technology verification experiment for a NASA test component and an SCU single-axis attitude control system (AACS) in Low Earth Orbit (LEO). This project builds upon the flight heritage of SCU's Robotic Systems Laboratory (RSL) and improves its satellite development …

Quikchill : Thermoelectric Water Cooler, Franz Louie Chua, Brandon Ohara, Rachel Reid, Bernadette Tong

Mechanical Engineering Senior Theses

Motivated by the increasing residential energy utilization projections and the fact that water and ice dispensers consume 20% of total refrigerator energy, a thermoelectric water chiller was designed to provide a more energy efficient alternative. Implementing the chiller under the sink provides a convenient means to source cold, filtered water, thereby eliminating the need for water and nice dispensers as well as filtering pitchers. The cooling chamber design integrates thermoelectric modules (TEMs), which operate on the Peltier effect to cool filtered water down to 14 [degrees] C. The implementation of TEMs reduced current dispenser energy consumption by 82.4%, from 91 …

Design And Realization Of A Hybrid Intelligent Controller For A Twin Rotor Mimo System, Jih-Gau Juang, Kai-Ti Tu

Journal of Marine Science and Technology–Taiwan

An intelligent control scheme using a fuzzy switching mechanism, grey prediction and genetic algorithm (GA) is applied to a coupled nonlinear system, called a twin rotor multi-input multi-output system (TRMS). In real-time control, a Xilinx Spartan II SP200 FPGA (Field Programmable Gate Array) is employed to construct a hardware-in-the-loop system through writing VHDL on this FPGA. The objective is to stabilize the TRMS in significant cross-coupled conditions, and to experiment with setpoint control and trajectory tracking. The proposed scheme improves the performance of the PID controller. Control gains and parameters of the fuzzy switching mechanism are obtained by GA. Simulation …

A Comparison Of Great Circle, Great Ellipse, And Geodesic Sailing, Wei-Kuo Tseng, Jiunn-Liang Guo, Chung-Ping Liu

Journal of Marine Science and Technology–Taiwan

An analytical and numerical comparison of great circle (GC) sailing, great elliptic (GE) sailing, and geodesic (Geod) sailing is presented. The comparison between GC and GE sailing addresses some problems whether the navigator and navigational software developers promptly have to use GE sailing or use hybrid sailing mixed with features of the GC sailing and GE sailing. This fact found here presents that the formulae tackling relationship of latitude and longitude of GC sailing also can be suited to the GE sailing except some calculation of GE sailing involving distance and course. The validity of effectiveness of proposed GE sailing …

The Variation Of Flexural Rigidity For Post-Tensioned Prestressed Concrete Beams, Ta-Heng Wang, Ran Huang, Tz-Wei Wang

Journal of Marine Science and Technology–Taiwan

The natural frequency of axial-loaded concrete beam decreases with increasing applied compressive force, and the natural frequency of tensioned cable increases with increasing tensile force. However, the variation of natural frequency of prestressed concrete beam (PCB) consisting of concrete and cable has rarely been discussed based on both |the rigorous mathematic model and experimental results. In this study, a testing program was conducted and Rayleigh's method was used to derive an approximate equation for computing natural frequency. The results indicate that (1) the natural frequency decreases with increasing prestressing force for PCB with eccentric parabolic tendon, but it is no …

A Piston-Type Porous Wave Energy Converter Theory, Ching-Yun Yueh, Shih-Hsuan Chuang

Journal of Marine Science and Technology–Taiwan

This study investigates the performance of a piston-type porous wave energy converter (PTPWEC), which consists of a solid wall, a vertical porous plate, a transmission bar, a rigid block constrained by rollers, a spring, and a damper. The PTPWEC is subjected to dynamic external loading by wave actions. To simulate this dynamic system, a mathematical model is used with a single-degree-of-freedom (SDOF) system. Linear wave theory governs the entire fluid domain, which is divided into two regions by the vertical porous plate. Darcy's law is applied to flow through the porous plate. Finally, this investigation employs an eigenfunction expansion to …

Application Of A Support Vector Machine For Liquefaction Assessment, Ching-Yinn Lee, Shuh-Gi Chern

Journal of Marine Science and Technology–Taiwan

This study presents a support vector machine (SVM)-based approach for predicting earthquake liquefaction. The SVM model database includes five indexes: earthquake magnitude, total overburden pressure, effective overburden pressure, qc values from cone penetration tests (CPT), and peak ground acceleration. The proposed model was trained and tested on a dataset comprising 466 field liquefaction performance records and CPT measurements. A grid search method with k-fold cross-validation was also used to verify the feasibility. Compared with an artificial neural network (ANN)–based method, the SVM-based method has the advantage of increased accuracy and simpler operation. Experimental results show that the proposed SVM approach …

Design Optimization Of A Submerged Vane With Streamlined Profile For Sediment Management In Rivers, Huei-Tau Ouyang, Jihn-Sung Lai

Journal of Marine Science and Technology–Taiwan

The design of the submerged vane, a flow training structure for sediment management in rivers, is optimized using a Genetic Algorithm. The vane considered in this study has a foil-like sectional profile and a tapered outline. The sectional profile of the vane is based on two types of shape formulations: (1) NACA’s four-digit wing profiles, and (2) profiles comprising two Bezier splines. By using Elitist and Crowding factor models, the optimization proceeds by creating successively improved generations of vanes. The final design for the vane with NACA profile has higher lift yet larger drag. Conversely, the final design for the …

Shoutboard : A New Locative Social Network, Evan Havlisch, Ketan Kumar, Tovin Thomas

Computer Science and Engineering Senior Theses

This paper will illustrate the need for a better location based social network that utilizes the latest smartphone features. Over the course of this project, we created ShoutBoard. ShoutBoard is a way for people to share messages with the people geographically close by. We accomplish this by creating a system with a client-server architecture. The user will use the iPhone app or the website to interact with our server. The server will fetch messages that other users have posted and return them to the client. Within this document, we describe in detail the problem we wish to solve, the current …

Conference Program, Engineering Conferences International

BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals

No abstract provided.

Amperometric Detection Of Bioamines In Cancer Borealis Using Microchip Capillary Electrophoresis Integrated With Micellar Chromatography, Ajay Fernandez, Jason Howard, Christina Shuh

Bioengineering Senior Theses

In order to study neuromodulation in Cancer borealis, commonly known as the Jonah crab, we designed a microchip capillary electrophoretic (CE) device with micellar electrokinetic chromatography (MEKC) to separate bioamines and detect their concentrations using amperometric detection (AD). The analysis will be used to characterize the bioamines: dopamine, octopamine, tyramine, serotonin, norepinephrine, and gammaaminobutyric acid (GABA). The device measures the concentration of bioamines in microdialysate samples taken directly from the pericardial cavity of the crab. The research on Jonah crabs will be applied to enhance our understanding of the crab neurology. Since the structure and in some instances, the function …

Ghana Footbridge Project, Kevin Leatham, Justin Mogannam

Civil, Environmental and Sustainable Engineering Senior Theses

Over the past 4 years, SCU civil engineering senior design teams have traveled to Ghana to help build the community and improve their quality of life. When the 2011-2012 team arrived back at SCU after their Ghana visit, they made the current project team aware of a very visible problem. Every winter a makeshift bridge that connects the village of Gambibgo and the town of Bolgatanga is washed away due to heavy downpours of rain. As a result, the people of Gambibgo do not have access to the market, healthcare, and sometimes even school. On the site visit, a site …

An Alternative System Identification Method For Friction Stir Processing, Dustin John Marshall

Theses and Dissertations

Temperature control has been implemented in friction stir processing and has demonstrated the ability to give improved process control. In order to have optimal control of the process, the parameters of the system to be controlled must be accurately identified. The system parameters change with tool geometry and materials, workpiece materials, and temperature. This thesis presents the use of the relay feedback test to determine the system parameters. The relay feedback test is easy to use and promotes system stability during its use. The results from the relay feedback test can be used to determine controller gains for a PID …

Formula Electric : Powertrain, Mark Allison, Bryan Bidwell, Stuart Hopson, Jackson Smith, Carlos Streegan, Dominic Villa

Interdisciplinary Design Senior Theses

The Santa Clara Formula Electric team designed, and manufactured a powertrain for an electric racecar according to the rules prescribed by the SAE International Formula Electric competition. The powertrain is divided into subsystems: the battery pack, battery pack cooling system, motor controller, and the motor. The battery pack was constructed, but full electrical connection of all cells were not made. The pack was not integrated with the motor and motor controller. In addition, due to time constraints, extensive testing could not be completed.

Production Of Renewable Drop-In Fuels And Chemicals From Thermal Conversion Of Non-Edible Lipids, David Bressler, Paolo Mussone

BioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals

No abstract provided.