Open Access. Powered by Scholars. Published by Universities.®

Other Mechanical Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

743 Full-Text Articles 1,476 Authors 407,055 Downloads 55 Institutions

All Articles in Other Mechanical Engineering

Faceted Search

743 full-text articles. Page 1 of 33.

Theatrical Turntable, Liam R. Martinez, Isaac Becker, Robert R. Reed, Caroline A. Whelan 2018 California Polytechnic State University, San Luis Obispo

Theatrical Turntable, Liam R. Martinez, Isaac Becker, Robert R. Reed, Caroline A. Whelan

Mechanical Engineering

No abstract provided.


Nasa Microgravity: Internal Structure And Recovery Method Optimization, Brenna Doherty 2018 University of Wyoming

Nasa Microgravity: Internal Structure And Recovery Method Optimization, Brenna Doherty

Honors Theses AY 17/18

Microgravity is defined as a state of having very little gravity, such as that experienced in space. Research has been performed by NASA for over 25 years as a way to determine how space technologies are impacted by a microgravity environment. To simulate microgravity, an aerodynamic payload is dropped in a vacuum chamber or from high altitudes until a state of freefall is reached. NASA drop towers are the standard microgravity testing platforms used today. These towers can produce microgravity environments for 2.2-5.2 seconds; however, these platforms are expensive and require months of advanced planning. The University of ...


Baseline Data From Servo Motors In A Robotic Arm For Autonomous Machine Fault Diagnosis, Jacob Brown 2018 University of Arkansas, Fayetteville

Baseline Data From Servo Motors In A Robotic Arm For Autonomous Machine Fault Diagnosis, Jacob Brown

Mechanical Engineering Undergraduate Honors Theses

Fault diagnosis can prolong the life of machines if potential sources of failure are discovered and corrected before they occur. Supervised machine learning, or the use of training data to enable machines to discover these faults on their own, makes failure prevention much easier. The focus of this thesis is to investigate the feasibility of creating datasets of various faults at both the component and system level for a servomotor and a compatible robotic arm, such that this data can be used in machine learning algorithms for fault diagnosis. The faults induced at the component level in different servomotors include ...


Accelerated Creative Problem Solving And Product Improvement Applied To Experimental Devices In A Bloodstain Pattern Interpretation Class--Improving The Role Of Insight Development Tools As A Generator Of New Ideas In Novel Situations, Douglas Ridolfi 2018 State University of New York College at Buffalo - Buffalo State College

Accelerated Creative Problem Solving And Product Improvement Applied To Experimental Devices In A Bloodstain Pattern Interpretation Class--Improving The Role Of Insight Development Tools As A Generator Of New Ideas In Novel Situations, Douglas Ridolfi

Creative Studies Graduate Student Master's Projects

This project uses an action research centered study protocol to examine the effects of a problem-based learning exercise related to bloodstain pattern interpretation in a crime scene processing and general criminalistics class taught as part of an upper division forensic chemistry major in a four year college. The goal is to apply design principles and creative problem solving methods directly adapted to a project involving interpreting a set of crime scene photographs depicting blood spatter and with the aid of guided exercises in ideation and design, lead students into the development of alternate theories of how the bloodstains were created ...


A Numerical Investigation Of Human Cough Jet Development And Droplet Dispersion, Ran Bi 2018 The University of Western Ontario

A Numerical Investigation Of Human Cough Jet Development And Droplet Dispersion, Ran Bi

Electronic Thesis and Dissertation Repository

As part of the Western Cold and Flu aerosol (WeCoF) studies, the present study provides Computational Fluid Dynamics (CFD) modelling of human cough flow. The cough flow is characterized in two different aspects, the flow field and the droplets. In the study of the flow field of coughing, various dynamic characteristics, including the velocity variation, streamwise penetration and power spectral density, are examined. CFD simulations using two different approaches, the unsteady Reynolds Averaged Navier-Stokes (URANS) and the large eddy simulation (LES), are performed for comparison purposes. The numerical results are validated by the experimental data obtained from the measurements by ...


Fabrication Of 3d Conjugated Polymer Structures Via Vat Polymerization Additive Manufacturing, Andrew T. Cullen 2018 The University of Western Ontario

Fabrication Of 3d Conjugated Polymer Structures Via Vat Polymerization Additive Manufacturing, Andrew T. Cullen

Electronic Thesis and Dissertation Repository

Conjugated polymers are a class of electromechanically active materials that can produce motion in response to an electric potential. This motion can be harnessed to perform mechanical work, and therefore these materials are particularly well suited for use as sensors and actuators in microelectromechanical systems. Conventional methods to fabricate conjugated polymer actuators result in planar morphologies that limit fabricated devices to simplistic linear or bending actuation modes. To overcome this limitation, this work develops a conjugated polymer formulation and associated additive manufacturing method capable of realizing three-dimensional conductive polymer structures. A light-based additive manufacturing technique known as vat polymerization is ...


A Numerical Tool For Predicting The Spatial Decay Of Freestream Turbulence., Dwaipayan Sarkar 2018 The University of Western Ontario

A Numerical Tool For Predicting The Spatial Decay Of Freestream Turbulence., Dwaipayan Sarkar

Electronic Thesis and Dissertation Repository

The present numerical work is an attempt towards modelling of freely decaying homogeneous isotropic turbulence with its application in experimental modelling of the effect of incident turbulence on flow around 2D and 3D bluff-bodies. Both steady, Reynolds Averaged Navier Stokes (RANS) and unsteady, Large Eddy Simulation (LES), 3-D numerical computational fluid dynamics (CFD) techniques have been employed to characterise the inviscid decay of large-scale turbulence in terms of the characteristic r.m.s turbulent velocity fluctuations ( ) and the local integral length scale (Lu). The large-scale turbulent properties extracted from the current numerical simulations are inter-related and are shown to ...


Experimental Simulation Of Density-Driven Thunderstorm Downbursts, Roghayyeh Babaei koli 2018 The University of Western Ontario

Experimental Simulation Of Density-Driven Thunderstorm Downbursts, Roghayyeh Babaei Koli

Electronic Thesis and Dissertation Repository

Evaporative cooling of the precipitation within the thunderstorm cloud results in the formation of a mass of cold and dense air which moves toward the ground and after impingement turns into strong radial winds near the surface. In this study, an experimental approach was taken to investigate the downbursts. The two-fluid model was used, and the various features of the experimental setup of previous researchers were modified to incorporate the specifications of natural downbursts. First, two new release cylinders were manufactured and their capabilities in producing repeatable and symmetric outflows were examined. Then, the effects of cylinder wall design, density ...


Cal Poly Rose Float Overheight Mechanism, Ali A. Harake, Breanna H. Tran, Morgan K. Montalvo, Sergio B. Gutierrez 2018 California Polytechnic State University, San Luis Obispo

Cal Poly Rose Float Overheight Mechanism, Ali A. Harake, Breanna H. Tran, Morgan K. Montalvo, Sergio B. Gutierrez

Mechanical Engineering

The Cal Poly Universities jointly build and enter a floral entry, commonly known as a float, into the Pasadena Tournament of Roses Rose Parade. At the end of this parade route, there is a 16’6” bridge all floats must drive under. The scope of our project is to design and build a mechanism roughly described as an “overheight” mechanism, as its function is to raise and lower large heavy structures so the float is able to pass under the bridge. This hydraulic mechanism is powered via the float animation system.


Robotic Mining Digging Core, John Stefan, Ryan Weir 2018 The University of Akron

Robotic Mining Digging Core, John Stefan, Ryan Weir

Honors Research Projects

The purpose of this design project is to design a digging core for a lunar robot that will collect large amounts of material buried beneath the surface of Mars so one day, astronauts can use those resources. This lunar robot will be competing in the NASA Robotic Mining Competition, where teams from universities around the country display and test their designs. This design must adhere to a newly implemented rule which states that the amount of gravel a robot collects will determine the team score. The layer of gravel is located underneath a layer of Regolith, which simulates the surface ...


Experimental Evaluation Of Uranyl Transport Into Mesoporous Silica Gel Using Fluorescence, Brandon M. Dodd 2018 Virginia Commonwealth University

Experimental Evaluation Of Uranyl Transport Into Mesoporous Silica Gel Using Fluorescence, Brandon M. Dodd

Theses and Dissertations

This research investigated parameters that can affect the use of nanoporous silica gel as a media for accumulating a detectable amount of uranium. The unique fluorescence of the Uranyl (UO22+) ion was used to evaluate the transport kinetics and accumulation within silica gel in a static fluid and under pressure driven flow. The addition of fluid flow decreased the time constant from on the order of an hour to approximately 2s with a very low fluid velocity of 0.36cm/s. The 0.36cm/s fluid velocity was found to be the critical velocity above which there was ...


Sandia Senior Design Collaboration: Vacuum Sensor Design, James L. Valerio, Eric J. Black, Joseph P. Bednarz, David R. Warther 2018 The University of Akron

Sandia Senior Design Collaboration: Vacuum Sensor Design, James L. Valerio, Eric J. Black, Joseph P. Bednarz, David R. Warther

Honors Research Projects

Sandia National Laboratories has requested a fully mechanical device to close a circuit after launch has occurred and the device enters a vacuum. Intended for applications in rockets and missiles, the device must fit in a 36 degree wedge with a 6.8 inch radius that is 6 inches in height and be ready to bolt onto a rocket. The pressure switch must be prevented from actuating until a launch acceleration ranging from 20 to 27g is detected. The pressure switch must close the circuit after a pressure of 10-1 Torr is reached and before a pressure of 10 ...


Human Powered Vehicle Frame Design, Analysis, Manufacturing, And Testing, Christopher Reed, Kole W. Williams 2018 University of Akron

Human Powered Vehicle Frame Design, Analysis, Manufacturing, And Testing, Christopher Reed, Kole W. Williams

Honors Research Projects

The University of Akron Human Powered Vehicle Design Team began this academic year with a mission to create a practical, lightweight, safe, and efficient human powered vehicle. The main objectives of ZC18 were inspired by competition in the 2018 Human Powered Vehicle Challenge at ASME E-Fest East. In addition to adhering to the rules of this competition, scoring high on the submitted reports, and competing well in the racing events, the team set a goal to assist in furthering knowledge related to the topic of human powered vehicles.

ZC18 was constructed nearly completely in the University of Akron’s Design ...


Building Entry Flood Barrier, Richard Esker, Shannon McCall, Andrew Udovich, Brian Foust 2018 The University of Akron

Building Entry Flood Barrier, Richard Esker, Shannon Mccall, Andrew Udovich, Brian Foust

Honors Research Projects

The purpose of this project is to develop a flood barrier that would resist flood water from entering through the doorways of a building. The goal is to mitigate extensive flooding within a structure. After the disastrous weather events that impacted American citizens late in the year of 2017, the team was inspired to develop a project to help disaster victims. Through extensive preliminary and market research, it was discovered that flooding is a serious issue that affects people all over the world. A product to stop flooding could benefit people in developed countries, but it could also help citizens ...


Design Of Shape-Conforming Nosecone For Optimal Fluid Flow From Transonic To Supersonic Range, Anna Tombazzi 2018 The University of Akron

Design Of Shape-Conforming Nosecone For Optimal Fluid Flow From Transonic To Supersonic Range, Anna Tombazzi

Honors Research Projects

Modern flight vehicles, such as rockets, missiles, and airplanes, experience a force caused by forebody wave drag during the flight. This drag force is induced when the frontal point of each vehicle breaks the pressure wave during flight. Efforts to reduce this wave drag force to improve flight efficiency include modifying the nosecone profile of the flight vehicles to lower the drag force.

This project revolved around creating a design to make the transformation of nosecone shapes from a ¾ Parabolic profile to a ½ Power Series profile possible, mid-flight. Using a novel nosecone assembly, shape memory alloys (SMAs) and ...


Human Powered Vehicle Design Team: Speed Variable Steering Stabilizer, Eric Miller, Matt Kraml 2018 The University of Akron

Human Powered Vehicle Design Team: Speed Variable Steering Stabilizer, Eric Miller, Matt Kraml

Honors Research Projects

The Human Powered Vehicle Competition (HPVC) is held annually by ASME at a few locations. The University of Akron has competed in the ASME-East and ASME-West competitions over the past handful of years against universities from all over the world. Objectives of each team for the competition are three-fold: vehicle design, racing performance, and innovation. Our senior design project involved working on the innovation concept for ASME-East 2018 held at Penn State University during the weekend of 4/13. Speed variable steering was decided upon by the entire HPVC team early in the design process as the innovation choice for ...


Liquid Interaction With Non-Wettable Surfaces Structured With Macroscopic Ridges, Mehran Abolghasemibizaki 2018 Virginia Commonwealth University

Liquid Interaction With Non-Wettable Surfaces Structured With Macroscopic Ridges, Mehran Abolghasemibizaki

Theses and Dissertations

Self-cleaning, anti-corrosion, anti-icing, dropwise-condensation, and drag-reduction are some applications in which superhydrophobic surfaces are implemented. To date, all the studies associated with superhydrophobic surfaces have been dedicated to understanding the liquid interaction with surfaces that are macroscopically smooth. The current study investigates the solid-liquid interaction of such surfaces which are fully decorated with macroscopic ridges (ribbed surfaces). In particular, the drop motion and impact on our newly designed non-wettable ribbed surface have been investigated in this work. Our experimental investigations have shown that liquid drops move faster on the ribbed surfaces due to lower friction induced by such a surface ...


Dislocations Interaction Induced Structural Instability In Intermetallic Al2cu, Qing Zhou, Jian Wang, Amit Misra, Ping Huang, Fei Wang, Kewei Xu 2018 Xi'an Jiaotong University

Dislocations Interaction Induced Structural Instability In Intermetallic Al2cu, Qing Zhou, Jian Wang, Amit Misra, Ping Huang, Fei Wang, Kewei Xu

Mechanical & Materials Engineering Faculty Publications

Intermetallic precipitates are widely used to tailor mechanical properties of structural alloys but are often destabilized during plastic deformation. Using atomistic simulations, we elucidate structural instability mechanisms of intermetallic precipitates associated with dislocation motion in a model system of Al2Cu. Interaction of non-coplanar <001> dislocation dipoles during plastic deformation results in anomalous reactions—the creation of vacancies accompanied with climb and collective glide of <001> dislocation associated with the dislocation core change and atomic shuffle—accounting for structural instability in intermetallic Al2Cu. This process is profound with decreasing separation of non-coplanar dislocations and increasing temperature and is likely ...


Molecular Doping Enabled Scalable Blading Of Efficient Hole-Transport-Layer-Free Perovskite Solar Cells, Wu-Qiang Wu, Qi Wang, Yanjun Fang, Yuchuan Shao, Shi Tang, Yehao Deng, Haidong Lu, Ye Liu, Tao Li, Zhibin Yang, Alexei Gruverman, Jinsong Huang 2018 University of North Carolina

Molecular Doping Enabled Scalable Blading Of Efficient Hole-Transport-Layer-Free Perovskite Solar Cells, Wu-Qiang Wu, Qi Wang, Yanjun Fang, Yuchuan Shao, Shi Tang, Yehao Deng, Haidong Lu, Ye Liu, Tao Li, Zhibin Yang, Alexei Gruverman, Jinsong Huang

Mechanical & Materials Engineering Faculty Publications

The efficiencies of perovskite solar cells (PSCs) are now reaching such consistently high levels that scalable manufacturing at low cost is becoming critical. However, this remains challenging due to the expensive hole-transporting materials usually employed, and difficulties associated with the scalable deposition of other functional layers. By simplifying the device architecture, hole-transport-layer-free PSCs with improved photovoltaic performance are fabricated via a scalable doctor-blading process. Molecular doping of halide perovskite films improved the conductivity of the films and their electronic contact with the conductive substrate, resulting in a reduced series resistance. It facilitates the extraction of photoexcited holes from perovskite directly ...


Flow Patterns Through Vascular Graft Models With And Without Cuffs, Chia Min Leong, Gary B. Nackman, Timothy Wei 2018 Rensselaer Polytechnic Institute

Flow Patterns Through Vascular Graft Models With And Without Cuffs, Chia Min Leong, Gary B. Nackman, Timothy Wei

Mechanical & Materials Engineering Faculty Publications

The shape of a bypass graft plays an important role on its efficacy. Here, we investigated flow through two vascular graft designs±with and without cuff at the anastomosis. We conducted Digital Particle Image Velocimetry (DPIV) measurements to obtain the flow field information through these vascular grafts. Two pulsatile flow waveforms corresponding to cardiac cycles during the rest and the excitation states, with 10% and without retrograde flow out the proximal end of the native artery were examined. In the absence of retrograde flow, the straight end-to-side graft showed recirculation and stagnation regions that lasted throughout the full cardiac cycle ...


Digital Commons powered by bepress