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Mechanical engineering

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Full-Text Articles in Mechanical Engineering

Water Walking As A New Mode Of Free Surface Skipping, Randy C. Hurd, Jesse Belden, Allan F. Bower, Sean Holekamp, Michael A. Jandron, Tadd T. Truscott Apr 2019

Water Walking As A New Mode Of Free Surface Skipping, Randy C. Hurd, Jesse Belden, Allan F. Bower, Sean Holekamp, Michael A. Jandron, Tadd T. Truscott

Mechanical and Aerospace Engineering Faculty Publications

Deformable elastomeric spheres are evaluated experimentally as they skip multiple times over a lake surface. Some spheres are embedded with small inertial measurement units to measure the acceleration experienced during water surface impact. A model for multiple impact events shows good agreement between measured acceleration, number of skipping events and distanced traveled. The experiment reveals a new mode of skipping, “water walking”, which is observed for relatively soft spheres impacting at low impact angles. The mode occurs when the sphere gains significant angular velocity over the first several impacts, causing the sphere to maintain a deformed, oblong shape. The behavior ...


Muse 1: Interactive Water Table, Sarah R. Higginbotham Dec 2018

Muse 1: Interactive Water Table, Sarah R. Higginbotham

Chancellor’s Honors Program Projects

No abstract provided.


Analysis Of The Properties Of Supercapacitors And Possible Applications For The Technology, Vincent Oliveto Jun 2018

Analysis Of The Properties Of Supercapacitors And Possible Applications For The Technology, Vincent Oliveto

Honors Theses

Supercapacitors have a lot of excellent qualities that would make them a great substitute for batteries when it comes to electrical energy storage systems. Supercapacitors can discharge and charge very rapidly, they have a lifespan in the realm of millions of cycles, and they are much more efficient than batteries. Unfortunately, they cannot hold nearly as much charge as batteries. This paper seeks to further investigate the properties of supercapacitor technology and the best way to exploit these properties with the purpose of integrating them into renewable energy systems. There is currently a lot of research occurring around the world ...


Rapid Characterization Of Local Shape Memory Properties Through Indentation, Peizhen Li, Haluk E. Karaca, Yang-Tse Cheng Nov 2017

Rapid Characterization Of Local Shape Memory Properties Through Indentation, Peizhen Li, Haluk E. Karaca, Yang-Tse Cheng

Mechanical Engineering Faculty Publications

Shape memory alloys (SMAs) have the ability to show large recoverable shape changes upon temperature, stress or magnetic field cycling. Their shape memory, material and magnetic properties (e.g. transformation temperatures, strain, saturation magnetization and strength) determine their prospects for applications from small-scale microelectromechanical systems to large scale aerospace and biomedical systems. It should be noted that properties of SMAs are highly temperature dependent. Generally, the conventional mechanical characterization methods (e.g, tension, compression, and torsion) are used on bulk samples of SMAs to determine those properties. In this article, it will be shown that indentation technique can be used ...


Innovation Of Driving Gear Train System For Developer Unit Of Lexmark Home Printers, Jay A. Crist, Sarah Gore, Kun Xie, Michael Mixoon Aug 2017

Innovation Of Driving Gear Train System For Developer Unit Of Lexmark Home Printers, Jay A. Crist, Sarah Gore, Kun Xie, Michael Mixoon

Chancellor’s Honors Program Projects

No abstract provided.


A Wood-Powered Lawn Mower: Separating The Rules Of Thumb From Engineering Design, William White Jun 2017

A Wood-Powered Lawn Mower: Separating The Rules Of Thumb From Engineering Design, William White

Honors College Capstone Experience/Thesis Projects

Biomass gasification, the thermal process of exracting combustible gasses from organic matter, is an established procedure that has been used for many years to provide fuel in various applications. It is a potential source of renewable fuel and has proven useful as a crisis energy source. This thesis investigates the primary engineering science principles involved in gasifier-engine system design. It arises from and supplements a WKU mechanical engineering senior project. The senior project has developed a wood gasification system designed to power a riding lawn mower. The thesis reiews theory-based design and separates it from informal hit and miss approaches ...


Influence Of Aluminum Passivation On The Reaction Mechanism: Flame Propagation Studies, Birce Dikici, Steven W. Dean, Michelle L. Pantoya, Valery I. Levitas, R. Jason Jouet Jun 2017

Influence Of Aluminum Passivation On The Reaction Mechanism: Flame Propagation Studies, Birce Dikici, Steven W. Dean, Michelle L. Pantoya, Valery I. Levitas, R. Jason Jouet

Valery I. Levitas

Currently, two main known mechanisms of aluminum (Al) nanoparticle reaction are discussed in the literature, namely those based on diffusion through an oxide shell and melt-dispersion. The two mechanisms lead to opposite predictions in nanoparticle design. The diffusion mechanism suggests that the reduction or complete elimination of the oxide shell will increase Al reactivity, whereas the meltdispersion mechanism suggests an increase in initial oxide thickness up to an optimal value. The goal of this study is to perform critical experiments in a confined flame tube apparatus to compare these two predictions. Specifically, the flame propagation rates of perfluoroalkyl carboxylic acid ...


Coupled Phase Transformations And Plastic Flows Under Torsion At High Pressure In Rotational Diamond Anvil Cell: Effect Of Contact Sliding, Biao Feng, Valery I. Levitas Jun 2017

Coupled Phase Transformations And Plastic Flows Under Torsion At High Pressure In Rotational Diamond Anvil Cell: Effect Of Contact Sliding, Biao Feng, Valery I. Levitas

Valery I. Levitas

A three-dimensional large-sliding contact model coupled with strain-induced phase transformations (PTs) and plastic flow in a disk-like sample under torsion at high pressure in rotational diamond anvil cell (RDAC) is formulated and studied. Coulomb and plastic friction are combined and take into account variable parameters due to PT. Results are obtained for weaker, equal-strength, and stronger high pressure phases, and for three values of the kinetic coefficient in a strain-controlled kinetic equation and friction coefficient. All drawbacks typical of problem with cohesion are overcome, including eliminating mesh-dependent shear band and artificial plastic zones. Contact sliding intensifies radial plastic flow, which ...


Virtual Reality Integrated Welder Training, Richard T. Stone, Kristopher Patrick Watts, Peihan Zhong Feb 2017

Virtual Reality Integrated Welder Training, Richard T. Stone, Kristopher Patrick Watts, Peihan Zhong

Richard T. Stone

Training in the welding industry is a critical and often costly endeavor; this study examines the training potential, team learning, material consumption, and cost implications of using integrated virtual reality technology as a major part of welder training. In this study, 22 participants were trained using one of two separate methods (traditional training (TT) and virtual reality integrated training (VRI)). The results demonstrated that students trained using 50% virtual reality had training outcomes that surpassed those of traditionally trained students across four distinctive weld qualifications (2F, 1G, 3F, 3G). In addition, the VRI group demonstrated significantly higher levels of team ...


Adjustable Height Table Chassis, Trevor Watkins Jan 2017

Adjustable Height Table Chassis, Trevor Watkins

All Undergraduate Projects

Having the ability to change a dining table between a sitting and standing position is a niche feature. This feature was created for people that play board games regularly at a table, or for people who require use of a dining table as a standing work area. The mechanism that the table works by is using an acme threaded rod as a lead screw, with two timing belt pullies driving the shafts up and down which cause the raising and lowering of the table. These pullies were machined to incorporate an ACME threaded bolt which was welded into each pully ...


Dynamic Modeling Of Thermal Management System With Exergy Based Optimization, Marcus J. Bracey Jan 2017

Dynamic Modeling Of Thermal Management System With Exergy Based Optimization, Marcus J. Bracey

Browse all Theses and Dissertations

System optimization and design of aircraft is required to achieve many of the long term objectives for future aircraft platforms. To address the necessity for system optimization a vehicle-level aircraft model has been developed in a multidisciplinary modeling and simulation environment. Individual subsystem models developed exclusively in MATLAB-SimulinkTM, representing the vehicle dynamics, the propulsion, electrical power, and thermal systems, and their associated controllers, are combined to investigate the energy and thermal management issues of tactical air vehicle platforms. A thermal vehicle level tip-to-tail model allows conceptual design trade studies of various subsystems and can quantify performance gains across the aircraft ...


Weather Balloon Payload Box, Shellbie Liberty Jan 2017

Weather Balloon Payload Box, Shellbie Liberty

All Undergraduate Projects

A payload box holding a self-rotating camera was constructed to go on a weather balloon that will document the upcoming solar eclipse on August 21, 2017. A group of physics students, and the paper’s author, are working under Dr. Darci Snowden on the CWU Near Space Observation Team for research dedicated to the eclipse in Oregon. Various projects, including the payload box, are being designed to go up on a high altitude weather balloon. The payload box was designed and constructed to withstand the impact force of falling from 120,000 ft. This was done so the box could ...


Transforming Lives At Sheridan : A Tribute To Dr. Mozammel Khan, Lorraine Fraser, Mozammel Khan, Iain Mcnab, Jack Urowitz, Soumitra Nandi, Srinivas Ganapathyraju, Kam Ho, Daniel Zrymiak Jan 2017

Transforming Lives At Sheridan : A Tribute To Dr. Mozammel Khan, Lorraine Fraser, Mozammel Khan, Iain Mcnab, Jack Urowitz, Soumitra Nandi, Srinivas Ganapathyraju, Kam Ho, Daniel Zrymiak

Books and Websites

The original 2017 edition of this title was published in recognition of Dr. Mozammel Khan’s career in quality assurance instruction and positive impact on graduates of Sheridan College’s Quality Assurance Manfacturing Management program (PQUAS), with proceeds from the book supporting the Mozammel Khan scholarship Foundation. Khan, originally from Bangladesh, taught in Singapore before immigrating to Canada in the 1990s, where he founded the first post-secondary QA program of its kind in Ontario at Sheridan College.

Editor Lorraine Fraser collects heartfelt letters of appreciation to Khan from alumni of the PQUAS program, who share memories, successes and challenges from ...


Design And Validation Of An Electro-Hydraulic Pressure-Control Valve And Closed-Loop Controller, Jerry Boza Dec 2016

Design And Validation Of An Electro-Hydraulic Pressure-Control Valve And Closed-Loop Controller, Jerry Boza

Dissertations

Electro-hydraulic pressure-control valves are used in many applications, such as manufacturing equipment, agricultural machinery, and aircrafts to name a few. They are often used to actuate hydraulic clutches, such as those found in power shift transmissions. A traditional pressure-control valve with open-loop control algorithm is typically used in clutch applications. This scheme often results in inconsistent or undesirable system behavior due to the nature of open-loop control as well as the nonlinear system dynamics and uncertainties.

In this research two new electro-hydraulic pressure-control valves were designed in order to decouple the valve and control port (hydraulic) dynamics. This was achieved ...


Full Virtual Reality Vs. Integrated Virtual Reality Training In Welding, Richard T. Stone, Elease Mclaurin, Peihan Zhong, Kristopher Patrick Watts Jun 2016

Full Virtual Reality Vs. Integrated Virtual Reality Training In Welding, Richard T. Stone, Elease Mclaurin, Peihan Zhong, Kristopher Patrick Watts

Richard T. Stone

This study demonstrates that both fully virtual and virtual reality (VR) integrated into real-world training programs are appropriate for use in the domain of welding training, depending on the level of task difficulty. Performance differences were virtually indistinguishable between participants in the fully virtual and the integrated training group at the low and medium weld difficulty levels. At the highest level of difficulty, it became apparent that the VR system was no longer solely sufficient for training. This study also tracked the usage patterns for the visual aids used in the VR simulator. These optional aids were presented to the ...


The Role Of Mechanical Design In Mechatronics Education, John Gardner Dec 2015

The Role Of Mechanical Design In Mechatronics Education, John Gardner

John Gardner

A survey of Mechatronics course offerings around the United States shows a rich variety of approaches to this topic.[1] Indeed, it appears that a majority of Mechanical Engineering programs across the county offer some formal offering in this area and it seems clear that the vast majority of Mechatronics courses are offered through Mechanical Engineering departments. With the traditional emphasis on design skill in mechanical engineering, it would seem obvious that mechatronics courses would feature a major design component. Surprisingly, very few existing mechatronics courses (at least those reported in the literature) feature a strong emphasis on mechanical design ...


Implementing A Linear Quadratic Spacecraft Attitude Control System, Daniel Kolosa Dec 2015

Implementing A Linear Quadratic Spacecraft Attitude Control System, Daniel Kolosa

Master's Theses

This thesis implements a linear quadratic attitude control system for a low-thrust spacecraft. The goal is to maintain spacecraft alignment with a time-varying thrust vector needed for trajectory change maneuvers. A linear quadratic attitude control approach is used to maintain spacecraft pointing throughout flight. This attitude control strategy uses the thrust-acceleration input obtained from a linear quadratic optimal trajectory control model that simulates the trajectory of a spacecraft in orbit maneuvers. This attitude model simulates a CubeSat, a small satellite that is equipped with a low-thrust propulsion and attitude control system. An orbit raising and a plane change scenario is ...


Custom Glasses Cases, Nikolas Ivan Klukas May 2015

Custom Glasses Cases, Nikolas Ivan Klukas

Mechanical Engineering and Technology Senior Projects

The modern market is centralized around technological advances that improve and better everyday life. With approximately 150 million Americans that use corrective eye-ware on a daily basis, the need for improved technology in glasses cases is inevitable. Current glasses cases work to either protect the glasses and are big and bulky, or are made smaller to be more easily transported. The concept is to take any pair of glasses and make a custom case for them. The programs being utilized to complete the project are solidworks and excel. The process is started by making a base layout of the glasses ...


Dump Bed Lifting Mechanism, Zachary Pate May 2015

Dump Bed Lifting Mechanism, Zachary Pate

Mechanical Engineering and Technology Senior Projects

The project was motivated by a need to create a device that would cause a small truck or trailer bed to lift up quickly and dump its contents. This would eliminate the need to use manual physical labor, which is both slow and exhausting. Additional design constraints require the stroke and diameter of the cylinder to be 6” x2”. A design was conceived with the intent to incorporate a less costly device onto an existing trailer frame that would lift the bed and dump the load. With this in mind, a scissor lift device would have two basic requirements, first ...


Branch Cutter Adapter For Electric Impact Gun, Cullen Hubbard May 2015

Branch Cutter Adapter For Electric Impact Gun, Cullen Hubbard

Mechanical Engineering and Technology Senior Projects

There are many homeowners that would like to maintain the trees around their homes but cannot do so. The drive of this project was to develop a 0g mechanism which would provide a senior citizen or an individual with limited upper body strength, with the ability to cut through branches that would otherwise pose challenging. The design would allow the end user to cut a branch by simply pulling a trigger. A branch cutting attachment was designed to attach to the front of a DeWALT cordless impact gun. This attachment will convert the rotational torque and motion from the impact ...


Instron Tt-C 1055 Redesign For Tensile Testing Lab Use: The Design And Construction Of Tensile Test Gripping Assemblies, Melvin Lee Hortman May 2015

Instron Tt-C 1055 Redesign For Tensile Testing Lab Use: The Design And Construction Of Tensile Test Gripping Assemblies, Melvin Lee Hortman

Mechanical Engineering and Technology Senior Projects

The goal of this project was to design, manufacture, and test a pair of cheap gripping assemblies with mount adapters to the Instron TT-C tensile testing machine, which was currently out of service in the Materials Laboratory of Central Washington University’s Hogue Technology Building, for educational use. The gripping assemblies would enable tensile, or pulling force, tests on tensile specimens up to 20,000 lbs, being able to test high carbon steel. The gripping assemblies and mounting adapters were designed and manufactured completely by a Central Washington University Mechanical Engineering Technology student who used the cumulative knowledge gained from ...


Pivoting Motocross Foot Pegs, Michael Leblanc May 2015

Pivoting Motocross Foot Pegs, Michael Leblanc

Mechanical Engineering and Technology Senior Projects

The ability to keep a dirt bike rider’s feet in full contact with the foot pegs at all times is something all riders’ face when riding their bike. The foot pegs that come factory and aftermarket today are universally static and non-rotational which prevent the ability for maximum contact to be maintained. During various riding positions, a rider’s foot can partially become disconnected from the peg allowing for a loss of potential control and balance/stability. The solution devised was a set of pegs that have the ability to rotate with the rider’s foot. The rotational ability ...


The Phone In The Sky ---- Quad-Copter For Aerial Video, Heng Wei Zhang May 2015

The Phone In The Sky ---- Quad-Copter For Aerial Video, Heng Wei Zhang

Mechanical Engineering and Technology Senior Projects

With the development of aircraft model technology, quadcopters equipped with cameras are used for aerial video more and more frequently. Cell phones, moreover, allow people to share photos online immediately, so many people prefer to take photos or videos by cell phones instead with expensive cameras. Thus, the purpose of this project is to design and build a light weight quadcopter frame and select the system components that allow the quadcopter to fly smoothly while carrying a cell phone for aerial video. The method for creating the quadcopter is separated into three steps: design, build, and test. The design part ...


Integration Of Information Literacy Skills To Mechanical Engineering Capstone Projects, Farshid Zabihian, Mary L. Strife, Marian G. Armour-Gemmen May 2015

Integration Of Information Literacy Skills To Mechanical Engineering Capstone Projects, Farshid Zabihian, Mary L. Strife, Marian G. Armour-Gemmen

Faculty Scholarship

Searching for information and using that information appropriately is an essential part of every engineering design project. It has been reported that design engineers spend about 30% of their time searching for information. Experience shows that even senior level students have not received proper training, either directly or indirectly, in information literacy (IL). They usually search for information intuitively. For mechanical and aerospace engineering students at West Virginia University Institute of Technology (WVU Tech), the Mechanical Engineering System Design I and II courses (MAE 480 and 481) are probably the last chance to teach students about IL. In this project ...


Syllabus: Introduction To Mechanical And Industrial Engineering, Erin Baker Jan 2015

Syllabus: Introduction To Mechanical And Industrial Engineering, Erin Baker

Sustainability Education Resources

Student teams will explore engineering analysis and design under the theme of Engineering Sustainability: Energy and the Environment, incorporating economics, environmental impacts, and social concerns. ENGIN 113 is intended to introduce students to the fields of Mechanical Engineering and Industrial Engineering, and to provide students with important skills that they will need to be successful in college and the professional world. The specific course objectives are to:  Develop effective teamwork skills, including peer- and self-evaluation.  Practice critical thinking and engineering problem solving.  Take a systems approach to design, incorporating economics, environment, and social concerns  Develop information literacy.  Communicate technical material ...


Optimal Design And Control Of A Lower-Limb Prosthesis With Energy Regeneration, Holly E. Warner Jan 2015

Optimal Design And Control Of A Lower-Limb Prosthesis With Energy Regeneration, Holly E. Warner

ETD Archive

The majority of amputations are of the lower limbs. This correlates to a particular need for lower-limb prostheses. Many common prosthesis designs are passive in nature, making them inefficient compared to the natural body. Recently as technology has progressed, interest in powered prostheses has expanded, seeking improved kinematics and kinetics for amputees. The current state of this art is described in this thesis, noting that most powered prosthesis designs do not consider integrating the knee and the ankle or energy exchange between these two joints. An energy regenerative, motorized prosthesis is proposed here to address this gap. After preliminary data ...


Cellulose–Hemicellulose And Cellulose–Lignin Interactions During Fast Pyrolysis, Jing Zhang, Yong S. Choi, Chang G. Yoo, Tae H. Kim, Robert C. Brown, Brent H. Shanks Jan 2015

Cellulose–Hemicellulose And Cellulose–Lignin Interactions During Fast Pyrolysis, Jing Zhang, Yong S. Choi, Chang G. Yoo, Tae H. Kim, Robert C. Brown, Brent H. Shanks

Chemical and Biological Engineering Publications

Previously, the primary product distribution resulting from fast pyrolysis of cellulose, hemicellulose, and lignin was quantified. This study extends the analysis to the examinations of interactions between cellulose–hemicellulose and cellulose–lignin, which were determined by comparing the pyrolysis products from their native mixture, physical mixture, and superposition of individual components. Negligible interactions were found for both binary physical mixtures. For the native cellulose–hemicellulose mixture, no significant interaction was identified either. In the case of the native cellulose–lignin mixture, herbaceous biomass exhibited an apparent interaction, represented by diminished yield of levoglucosan and enhanced yield of low molecular weight ...


Autonomous Indoor Localization For Fire Safety And Resource Location Via Field Mapping Techniques, Jaeyoung Kim, Kartik Ariyur, Yan Cui, Benjamin D. Branch, Joshua Ebung Umo Apr 2014

Autonomous Indoor Localization For Fire Safety And Resource Location Via Field Mapping Techniques, Jaeyoung Kim, Kartik Ariyur, Yan Cui, Benjamin D. Branch, Joshua Ebung Umo

Libraries Faculty and Staff Presentations

An overall result of this collaboration between the Mechanical Engineering Dept. and the Purdue University Libraries (PUL) should result in building a big data framework that make have knowledge transfer for similar large scale geospatial data implementations. Such may promote best practices of data management where the library skill sets may aid faculty research and student learning. Here, the PUL is concerned with advancing the Mechanical Engineering‘s STEM pipeline capacity with this type of research, collaboration and data management engagement.


Autonomous Indoor Localization For Fire Safety And Resource Location Via Field Mapping Techniques (Android Version), Joshua Ebung Umo, Yan Cui, Kartik Ariyur, Benjamin D. Branch, Jaeyoung Kim Apr 2014

Autonomous Indoor Localization For Fire Safety And Resource Location Via Field Mapping Techniques (Android Version), Joshua Ebung Umo, Yan Cui, Kartik Ariyur, Benjamin D. Branch, Jaeyoung Kim

Libraries Faculty and Staff Presentations

An overall result of this collaboration between the Mechanical Engineering Dept. and the Purdue University Libraries (PUL) should result in building a big data framework that make have knowledge transfer for similar large scale geospatial data implementations. Such may promote best practices of data management where the library skill sets may aid faculty research and student learning. Here, the PUL is concerned with advancing the Mechanical Engineering‘s STEM pipeline capacity with this type of research, collaboration and data management engagement.


Autonomous Indoor Localization Via Field Mapping Techniques, With Agricultural Big Data Application, Yan Cui, Kartik Ariyur, Benjamin D. Branch Mar 2014

Autonomous Indoor Localization Via Field Mapping Techniques, With Agricultural Big Data Application, Yan Cui, Kartik Ariyur, Benjamin D. Branch

Libraries Faculty and Staff Presentations

This joint collaboration between the library, the Mechanical Engineering department shows the current research of localizing an Android smartphone using big data collection and sensor fusion techniques. The original work is Autonomous Indoor Localization via Field Mapping Techniques which primarily designed as indoor fire and safety aid.

For Agricultural Big Data Use, the Android smartphone is being applied to in indoor greenhouse fire, safety and data knowledge design. Such may aid big data tool value to greenhouse fire and safety design and any data that may be important fieldwork considerations.

The indoor agricultural mapping application may be application to greenhouses ...