Mechanical Engineering Commons^™

Hierarchical Mechanisms Of Lateral Interactions In High- Performance Fibers, Taylor A, Stockdale, Daniel P. Cole, Jeffrey M. Staniszewski, Michael R. Roenbeck, Dimitry Papkov, Steve R. Lustig, Youris A. Dzenis, Kenneth E. Strawhecker

Department of Mechanical and Materials Engineering: Faculty Publications

The processing conditions used in the production of advanced polymer fibers facilitate the formation of an oriented fibrillar network that consists of structures spanning multiple length scales. The irregular nature of fiber tensile fracture surfaces suggests that their structural integrity is defined by the degree of lateral (interfacial) interactions that exist within the fiber microstructure. To date, experimental studies have quantified interfacial adhesion between nanoscale fibrils measuring 10−50 nm in width, and the global fracture energy through applying peel loads to fiber halves. However, a more in-depth evaluation of tensile fracture indicates that fiber failure typically occurs at an intermediate …

Cardiorespiratory Fitness, Balance And Walking Improvements In An Adolescent With Cerebral Palsy (Gmfcs Ii) And Autism After Motor-Assisted Elliptical Training, Guilherme Manna Cesar, Thad W. Buster, Judith M. Burnfield

Department of Mechanical and Materials Engineering: Faculty Publications

Purpose: To quantify the impact of motor-assisted elliptical (ICARE) training on cardiorespiratory fitness, balance and walking function of an adolescent with walking limitations due to cerebral palsy.

Materials and methods: A thirteen-year-old boy with hemiplegic cerebral palsy (Gross Motor Function Classification System II) and autism participated. Peak oxygen consumption (peak VO₂, primary outcome measure), oxygen cost of walking, Pediatric Balance Scale (PBS), modified Timed Up and Go (mTUG), 2-Minute Walk Test (2MWT), and gait characteristics (speed, cadence, step length, single support time) were assessed prior to and after completion of 24 sessions of moderate- to vigorous- intensity ICARE …

Three-Dimensional Characterization Of Peripapillary Retinal Pigment Epithelium-Basement Membrane Layer In Patients Following Lumbar Puncture, Junfei Tong, Pengfei Dong, Sachin Kedar, Deepta Ghate, Linxia Gu

Department of Mechanical and Materials Engineering: Faculty Publications

Purpose: To develop and test an innovative semi-automatic method for quantifying the three-dimensional morphology of the peripapillary retinal pigment epithelium-basement membrane (ppRPE/BM) layer, with application to lumbar puncture (LP) patients. Methods: Nineteen patients undergoing LP were recruited. The optic nerve head images of both eyes were acquired in 12 radial directions using optical coherence tomography (OCT) before and after LP. For each OCT image, the ppRPE/BM layer was automatically segmented with manual corrections by independent graders when necessary. The linear regression model of the ppRPE/BM layer was fitted using the least squares approach, and the ppRPE/BM layer angle was measured …

Roboticdeviceswithonboard Control And Related Systems And Devices, Shane Michael Farritor, Erik Mumm, Philip Chu, Nishant Kumar, Jason Dumpert, Yutaka Tsutano

Department of Mechanical and Materials Engineering: Faculty Publications

The embodiments disclosed herein relate to various medical device components, including components that can be incorporated into robotic and/or in vivo medical devices. Certain embodiments include various modular medical devices for in vivo medical procedures.

Role Of Interfacial Transition Zones In The Fracture Of Cu/V Nanolamellar Multilayers, Siyuan Wei, Shijian Zheng, Lifeng Zhang, Yue Liu, Jian Wang, Xianping Wang, Jiangwei Wang

Department of Mechanical and Materials Engineering: Faculty Publications

Plastic deformation and fracture behavior of Cu/V nanoscale metallic multilayers (NMMs) were systematically investigated through in situ transmission electron microscopy testing. Two different types of interfaces: sharp interfaces and interfacial transition zones (ITZs), formed in the as-fabricated Cu/V NMMs. Upon deformation, sharp interfaces and ITZs exert distinct influences on the fracture behavior of Cu/V NMMs. Sharp interfaces can impede the crack propagation by deflecting the crack propagation and blunting the crack tip, while the ITZs can induce microcracks and facilitate the fracture process. These findings shed light on the important roles of interface structures in the deformation of a broad …

Prosthetic Hand: Structure, Riley Smith, Riley Smith

All Undergraduate Projects

The objective of this project was to design the structure of a prosthetic hand that has articulating fingers and thumb in order to grip various objects. A design was developed that can add to the available options of prosthetics on the market.

In order to create a base hand for the project, the hand was modeled off of rough human hand dimensions. Analyses determined the feasible size of components. Once a base size was found the movement system in both grip and return form were developed and refined. With the parts being modeled in Solidworks and 3D printed, iterations of …

Electrathon Vehicle: Front Suspension, Christopher Clark

All Undergraduate Projects

Central Washington University does not currently have a competition field-able Electrathon America electric vehicle with adequate front suspension. The aim of this project was to provide the vehicle with handling that supports sound ground contact throughout the competition environment. Handling that supports sound ground contact is important for vehicles so they can go around corners without a loss of traction or flipping over. The solution to this engineering problem was designed and tested through various requirements. The requirements at hand were that the suspension components weigh less than 50 pounds, that there be no more than 3 inches of suspension …

Jcati Composite Delaminator, Payden Coffman

All Undergraduate Projects

Improvements need to be made to the existing delaminator system designed to crush proprietary Boeing 777 composite material. The current design incorporates a hydraulic system to achieve the high loads needed to separate material layers. The new system will need to be able to apply the same loads while at the same time allowing for a constant feed of material through the system. To achieve this, a “gear-like” crushing system will be implemented that will apply a high enough radial load into the material that will achieve delamination equal or greater than the previous design while at the same time …

Next Generation Longboard Trucks Ng-Trucks, Zach J. Ducatt

All Undergraduate Projects

A device is needed that will provide longboard riders with a truck that is specifically designed for the sharp turns and high speeds they experience throughout their ride. This longboard truck must have a design that is engineered for these purposes and avoids the standard pin and bushing design that is commonly copied from the closely related skateboard truck. This standardized design is outdated, and more importantly, was made to adhere to the skateboard style of riding, consisting primarily of performing tricks with less turning. The longboard truck provides a secure connection point upon the two wheels and the board …

Forge Burner, Caleb Desjardins

All Undergraduate Projects

Can small scale blacksmithing operations achieve a level of efficiency in their forge comparable to that of a large scale industry? The causes for the lack of efficiency needed to be pinpointed, and then the geometry of the existing design for the burner could be changed to fix the underlying issues, while still maintaining functionality. The problems with the previous design is the geometry of the intake giving an unknown air/fuel ratio, and the attachment of to the forge allowing the intake air to be contaminated by exhaust gasses. A burner needed to be designed that would solve these problems …

Drone Payload Storage & Release System (Dpsrs), Joseph E. Key

All Undergraduate Projects

The retail giant Amazon has become a household name synonymous with nearly instantaneous online shopping. What previously took weeks to deliver at exorbitant shipping fees can now arrive at your doorstep within two days—and all for free. This huge buyer incentive has skyrocketed the demand for online shopping, making Amazon the most valuable brand in the world. To meet this demand, Amazon and its distributors have proposed using drones to make deliveries. However, due to issues with cost and complexity, this has not yet materialized. As such, this project’s objective was to create a cheap and lightweight package-delivery system that …

Tensile Specimen Punch, Triet Huynh

All Undergraduate Projects

There is a significant demand of tensile specimen for the students in MET 426 Lab. The solution would be to facilitate specimen production in the lab. This project designed a punch and die to take raw sheet material and produce some tensile specimens. The project was conceived, analyzed, and designed at the Central Washington University (CWU) Mechanical Engineering Technology department. Working within the constraints of our university resource, all the parts were made in the CWU machine shop. This project includes the base, that holds the specimen in place, and the punch, that will remove the material. Two dies and …

Footsteps Power Generator, Faisal Alonazi, Mohammed Aljohani

All Undergraduate Projects

This project was motivated by the need for a device that would generate electricity from human motion, especially footsteps. Electricity is a very important resource in our daily life. There are numerous sources from which generate electrical energy. The major sources of energy include but are not limited to coal, natural gas, petroleum, and nuclear energy. Most of these sources have adverse effects on the environmental inclusion such as air pollution; for example, from coal energy generation plants which then cumulatively leads to effects such as increase in rates of global warming. This project seeks to establish an environmentally friendly …

General Aviation Modular Electric Tow Bar, Devon Tandberg

All Undergraduate Projects

In general aviation, pilots use either a tow bar or a tug to maneuver their planes to and from its parking place. A tow bar is a lightweight human powered device that allows a pilot to push and pull his/her pane by themselves using human power. A tug is a similar device, except much bigger and heavier, and is electrically powered, allowing for an easier time maneuvering a plane. The downside to a tug is since they are bigger and heaver, they cannot be taken with a pilot on a trip. The goal of this project was to combine the …

R/C Mini Baja Car: Drive Train And Steering, Carlton R. Mcdonald

All Undergraduate Projects

The purpose of the Baja R/C Car is to compete in the ASME eFX competition in a series of events to prove the functionality of the vehicle. This series of events includes the Slalom, Drag, and Baja race, The Slalom is a test in the steering capability of the vehicle, the Drag is a test in the acceleration of the vehicle in a straight line, and the Baja puts all factors together in a race to test every component of the vehicle. This project is about building an R/C car that not only functions, but also has maximum performance capabilities …

Fire Fighter Robot, Sultan Alhajrri

All Undergraduate Projects

The Fire Fighter Robot has been made in this project which can fight against the fire and that should be controllable over WiFi from the particular distance. The main objective of the design was that to fabricate the frame of the robot on which the whole top part of the robot can sit. The main constraint was that high-level skills were required for the implementation of some sections. The bottom part of the robot was first designed on the SOLIDWORK and Fusion360 software. the Whole dimensions were set for the bottom part so that the water tank, camera and the …

Modular Hardtop, Dennis Fedorchuk

All Undergraduate Projects

Title and Author: Modular Hardtop by Dennis Fedorchuk

Abstract:

A Jeep Wrangler Hardtop is a product that becomes inconvenient during the hot summer days when someone wants to remove the top for the next few months of sunshine. The question that comes up is “Where does someone store the top in the offseason?”. Unless an individual has a hardtop hoist in the garage, the hardtop will take up half of the garage. What if that individual does not want to drill holes in the ceiling or needs the floor space? That is where the Modular Hardtop comes into play. This …

Ev Clutch System, Jacob Yordy

All Undergraduate Projects

This project’s goal was to add a clutch system to an electrical vehicle at Central Washington University. The project’s second goal was to have the clutch system improve the electrical vehicle’s fuel economy for Electrathon events. Electrathon uses an equivalent mpg formula to determine an electrical vehicle’s “fuel economy.” Based on the amount of energy in kilo-Watt hours in a gallon of gas, Electrathon assumes each car uses 0.026 gallons of “gas” in the hour long race and the mpg value given to an electrical vehicle is based on the distance the vehicle travels in the race. Analyzes and problem …

Mechanical Footstep Power Generator, Mohammed Saleh Aljohani, Faisal Alonazi

All Undergraduate Projects

Mechanical Footstep Power generator

By Author: Mohammed Aljohani

Abstract

Modern technology is focusing on newer and better sources of energy. Among the important areas are power generation methods since electricity has become part of our lives. Various researchers have conducted surveys to find out the feasibility of converting renewable kinetic energy into electricity. Some of the works done in the past emphasized the selection of suitable materials and power generation systems designs that appear complicated and expensive. To ensure there is cost efficiency and energy efficiency better power generation systems need to be embraced.

The footstep power generator is a …

Outrigger Project, Jose Reyna, Tyler Hoffman

All Undergraduate Projects

Outrigger Project

Author: Jose Reyna ([email protected])

Co-Author: Tyler Hoffman ([email protected])

Mentors: Neil Hauff ([email protected]), Dr. Choi ([email protected]), Professor Pringle ([email protected]), Professor Bramble ([email protected]), Dr. J ([email protected])

Abstract

Agricultural areas sometimes experience cold weather in early spring and risk damage to crops due to freezing. To combat this issue, farms can employ temporary fans to keep the blossoms from freezing. The design of a 17-foot-tall wind turbine mounted on 7-foot-wide trailer can help mix the warm air that’s above the wind turbine with the colder air that’s below to keep the crop from freezing. These wind turbines can produce …

Assessing 3d Printability Of Bioinks, Nicole Ramirez

Honors Undergraduate Theses

The field of tissue engineering (TE) is continuously improving through the use of additive manufacturing techniques (AM) such as three-dimensional (3D) bioprinting. The 3D bioprinter has significantly gained attention in the TE field because it is more efficient than regenerative medicine and is readily available as opposed to organ transplants. Working like a conventional 3D printer, the 3D bioprinter is able to dispense material layer by layer from the bottom up with the printing head able to move in the X, Y, and Z direction. This movement allows for the fabrication of structures with complex geometries. In this study, the …

Continuous Otm 33a Analysis Of Controlled Releases Of Methane With Various Time Periods, Data Rates And Wind Filters, Robert S. Heltzel, Mohammed T. Zaki, Aron K. Gebreslase, Omar I. Abdul-Aziz, Derek R. Johnson

Faculty & Staff Scholarship

Other test method (OTM) 33A has been used to quantify emissions from natural gas sites since it was introduced by the Environmental Protection Agency (EPA). The method relies on point source Gaussian (PSG) assumptions to estimate emissions rates from a targeted site or source. However, the method often results in low accuracy (typically ±70%, even under conducive conditions). These accuracies were verified with controlled-release experiments. Typically, controlled releases were performed for short periods (15–20 min) under atmospheric conditions that were ideal for effective plume transport. We examined three methane release rates from three distances over various periods of time ranging …

Design Of Banner Tow Mechanism For Bush Plane, Kyle Ciarrone, Ivan Martin, Rishabh Gadi, Tyler Brandt

Williams Honors College, Honors Research Projects

The 2019-2020 AIAA DBF objective was to design, build, and test a banner-towing bush plane that carries wooden passengers and luggage. Senior members on the team undertook the creation of the banner tow mechanism subsystem as their senior design project on behalf of the design team due to the challenge of its mechanical design and the aerodynamic considerations regarding its placement and enclosure aboard the aircraft. The competition as well as access to campus resources were canceled due to COVID-19, so full testing and integration of the mechanism was not achieved. However, the engineering design process was experienced from the …

Cell Encapsulation In Microfluidic Channels, Mohammad Nooranidoost

Electronic Theses and Dissertations, 2020-2023

Droplet Microfluidics can be utilized to control the production of single droplets and double emulsions in biomedical application. This dissertation analyzes the droplet formation in hydrophobic and hydrophilic microchannels, encapsulation of cells in flow-focusing channels, and deformation of cell-laden droplets in constricted microcapillaries. The formation of droplets is studied in hydrophobic and hydrophilic channels in order to investigate the role of contact angle on flow structures and droplet generation patterns. In the hydrophobic case, stable and well-structured droplet and slug generation is achieved. However, the flow structure in the hydrophilic case significantly depends on contact angles of the walls. A …

Classical Engineering Systems Provide Behavioral Analog For Ephemeral Insect And Plant Biomechanics, Nicholas Smith

Electronic Theses and Dissertations, 2020-2023

In this dissertation we consider ephemeral behaviors of two small-scale living systems, mosquitoes and citrus fruit reservoirs. While these two systems share few obvious commonalities, they both express life events that are complex and conclude within approximately 50 milliseconds. We utilize high-speed videography, between 1,000-16,000 fps, to detail how complex behavior can be modeled as classical engineering systems. Beginning with the larger organism we assessed the landing and takeoff behavior of Aedes aegypti mosquitoes to ascertain the secrets of their covert interaction with humans. At takeoff, mosquitoes decrease pushing contact time with substrates of low friction through a modified takeoff …

A Computational Biomechanical Model-Based Optimization Of Fulcrum Support In Orthosis Enabled Closed Reduction Of Developmental Dysplasia Of The Hip, Christopher Rose

Electronic Theses and Dissertations, 2020-2023

Hip abduction orthosis devices (HAOD) are used to reduce the hip joint of infants affected by developmental dysplasia of the hip (DDH). HAOD have been successful for mild cases of DDH and ineffective for severe cases. Efforts in understanding the biomechanics of lower limbs have been made to improve the success rate of current treatment methods, especially for Grade IV dislocations (G4). The aim of this dissertation is twofold: first, it proposes the use of a varying fulcrum point (FP) located below the leg to improve DDH treatment; and secondly, it defines the optimal FP (OP) location for a broad …

Evaluation Of Far-Side Occupant Safety Based On Numerical Modeling, Syed Akhtar Imam

Wayne State University Dissertations

The objective of this study was to augment the knowledge of the far-side occupant injury biomechanics in side impact vehicle crashes. Most research studies conducted to investigate the far-side occupant injuries are through the field crash data for a better understanding of human impact responses, injury mechanisms, and injury tolerance levels. The data obtained from field data is also used in the development of injury mitigation technologies, such as safety belts, airbags, etc. A field data represents the injury outcome of an automotive crash, but it doesn’t leave behind enough information for in-depth knowledge. The use of cadaver is the …

Low- And High-Drag Intermittencies In Turbulent Channel Flows, Rishav Agrawal, Henry C.-H. Ng, Ethan A. Davis, Jae Sung Park, Michael D. Graham, David J.C. Dennis, Robert J. Poole

Department of Mechanical and Materials Engineering: Faculty Publications

Recent direct numerical simulations (DNS) and experiments in turbulent channel flow have found intermittent low- and high-drag events in Newtonian fluid flows, at Reτ = uτh/ν between 70 and 100, where uτ, h and ν are the friction velocity, channel half-height and kinematic viscosity, respectively. These intervals of low-drag and high-drag have been termed “hibernating” and “hyperactive”, respectively, and in this paper, a further investigation of these intermittent events is conducted using experimental and numerical techniques. For experiments, simultaneous measurements of wall shear stress and velocity are carried out in a channel flow facility using hot-film anemometry (HFA) and laser …

Experimental Studies Of Interfacial Behavior Of Contact System During Liquid Mediated Rough Surfaces Separation, Nhat Le

All Graduate Theses, Dissertations, and Other Capstone Projects

In the applications related to liquid-solid interface, their operation could be affected by the properties of the interface especially the applications that have infinitesimal interaction force at the interface surface and high interaction velocity. This study provides real time dynamic force measurement in separation process along with the real time image acquisition to explain the deviation between theoretical and experimental methods. The experimental design, setup and initial conditions for experiment are described in detail for further study related to liquid separating force. The simulation model is created to apply the theoretical model in prediction of meniscus force for different initial …

Indoor Navigation For Visually Impaired Person Using Inertial And Geomagnetic Information, Jayanth Ammanabrolu

All Graduate Theses, Dissertations, and Other Capstone Projects

Motivated by the need for assistance of indoor guidance for visually impaired persons (VIPs), a sensing system using inertial and geo-magnetic information has been developed to navigate a VIP person indoor. Orientation estimation, which is critical for indoor localization, is conducted using the information of the angular velocity, acceleration and geomagnetic field. By analyzing the characters of human gait, a method to eliminate the accumulated drift introduced by double integrations is introduced. By attaching the inertial sensor to the foot, the periodic stationary state will facilitate the drift correction. Also, the distinctive distortion of the geomagnetic field, which contains spatial …