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Articles 151 - 180 of 593
Full-Text Articles in Mechanical Engineering
Mesoscale Modeling Of Grain Crushup In Eglin Sand Through Discrete Element Fractal Fragmentation, Gerald Pekmezi, David Littlefield
Mesoscale Modeling Of Grain Crushup In Eglin Sand Through Discrete Element Fractal Fragmentation, Gerald Pekmezi, David Littlefield
Early Career Technical Journal (ECTJ)
Section 5: Materials; pp. 106-112
Thermal Management Of Pa-03-10-600 Linear Electromechanical Actuator End Windings Using Straight Circular Heat Pipes And Fins, August Akuoko Kwarteng, Kamal Kaddoura, Jose Corona Jr, Quin H. Leland, Louis Chow, John Kizito
Thermal Management Of Pa-03-10-600 Linear Electromechanical Actuator End Windings Using Straight Circular Heat Pipes And Fins, August Akuoko Kwarteng, Kamal Kaddoura, Jose Corona Jr, Quin H. Leland, Louis Chow, John Kizito
Early Career Technical Journal (ECTJ)
Section 6: Thermal Sciences; pp. 115-122
Shaft Cooling For High Speed Applications, Obed Y W Abotsi, S Esau, R Kabir, J P. Kizito
Shaft Cooling For High Speed Applications, Obed Y W Abotsi, S Esau, R Kabir, J P. Kizito
Early Career Technical Journal (ECTJ)
Section 6: Thermal Sciences; pp. 123-130
A Parametric Study On The Performance Of Heat Sinks, Britney Sumayah, Kendrick Aung
A Parametric Study On The Performance Of Heat Sinks, Britney Sumayah, Kendrick Aung
Early Career Technical Journal (ECTJ)
Section 6: Thermal Sciences; pp. 131-136
Suitability, Sizing, And Configuration Of A Solar Powered Vapor Absorption Cooling System, Harold A. Walters, Tejas S. Pandya
Suitability, Sizing, And Configuration Of A Solar Powered Vapor Absorption Cooling System, Harold A. Walters, Tejas S. Pandya
Early Career Technical Journal (ECTJ)
Section 6: Thermal Sciences; pp. 137-145
Control Of Flow Separation On A Hump Model Using A Dielectric Barrier Discharge Plasma Actuator, Mahdi Hasan, Michael Atkinson
Control Of Flow Separation On A Hump Model Using A Dielectric Barrier Discharge Plasma Actuator, Mahdi Hasan, Michael Atkinson
Early Career Technical Journal (ECTJ)
Section 7: Numerical Methods; pp. 148-154
Solving Knights Covering Problem: Backtracking, Permutation, Bipartite Graph, And Independent Set, Serkan Guldal, Michael Lipscomb, Murat M. Tanik
Solving Knights Covering Problem: Backtracking, Permutation, Bipartite Graph, And Independent Set, Serkan Guldal, Michael Lipscomb, Murat M. Tanik
Early Career Technical Journal (ECTJ)
Section 7: Numerical Methods; pp. 155-160
Effect Of Thermal Conduction On Turbulent Heat Transfer For Attached And Separated Flows, M Elmellouki, S Bhushan
Effect Of Thermal Conduction On Turbulent Heat Transfer For Attached And Separated Flows, M Elmellouki, S Bhushan
Early Career Technical Journal (ECTJ)
Section 7: Numerical Methods; pp. 161-169
An Implementation Of The Automotive External Airbag To Examine Impact Mitigation, Dhruvesh Modi, Lee Moradi
An Implementation Of The Automotive External Airbag To Examine Impact Mitigation, Dhruvesh Modi, Lee Moradi
Early Career Technical Journal (ECTJ)
Section 7: Numerical Methods; pp. 170-178
Design And Implementation Of Periodic Unsteadiness Generator For Turbine Secondary Flow Studies, Nathan James Fletcher
Design And Implementation Of Periodic Unsteadiness Generator For Turbine Secondary Flow Studies, Nathan James Fletcher
Browse all Theses and Dissertations
A primary source of periodic unsteadiness in low-pressure turbines is the wakes shed from upstream blade rows due to the relative motion between adjacent stators and rotors. These periodic perturbations can affect boundary layer transition, secondary flow, and loss generation. In particular, for high-lift front-loaded blades, the secondary flowfield is characterized by strong three-dimensional vortical structures. It is important to understand how these flow features respond to periodic disturbances. A novel approach was taken to generate periodic unsteadiness which captures some of the physics of turbomachinery wakes. Using stationary pneumatic devices, pulsed jets were used to generate disturbances characterized by …
Development Of Physics Based Machine Learning Algorithms, Rob Jennings
Development Of Physics Based Machine Learning Algorithms, Rob Jennings
Master’s Theses
In this study, a baseball pitch was examined to try to understand its behavior, and make a predictive model of it. A baseball pitch was tested experimentally with a wind tunnel and modeled computationally with COMSOL CFD software. Five input variables (spin rate, sting angle, seam orientation: Y axis, seam orientation: Z axis, and air velocity) were controlled, with force in three axes recorded as outputs. The experimental and computational results were examined and seen to be interdependent for all input variables. Experimental and computational data were both insufficient for predicting system behavior. Experimental data collection would have required an …
Power/Thermal Interaction Within An Adaptive Turbine Engine, Andrew K. Desomma
Power/Thermal Interaction Within An Adaptive Turbine Engine, Andrew K. Desomma
Browse all Theses and Dissertations
Usually power take off (PTO) with a two-spool turbofan engine has been accomplished via the high pressure (HP) shaft and bleed air from the high-pressure compressor (HPC). The PTO is used to run various aircraft components such as generators and hydraulic pumps, which also produce waste heat. To better understand the coupled transient nature of balancing engine thrust, power take off and thermal management, a transient variable cycle three stream turbofan engine model has been developed to investigate the integrated behavior. The model incorporates many dynamic features including a third-stream heat exchanger as a heat sink for thermal management and …
Recumbent Bicycle Balancing Aid, James Hager
Recumbent Bicycle Balancing Aid, James Hager
Williams Honors College, Honors Research Projects
For our senior design project, our team will be consulting to create a balancing aid system intended for the recumbent bicycle shown below in Figure 1. The owner of the bicycle is Robert Henderson, a former United States Navy sailor from Northeast Ohio who picked up biking and skiing while he was stationed in Maine in the late 80’s. While there, he took to the mountains on the rugged terrain and brought this passion of biking back home to share with his wife, Johanna once he completed his service to his country. Biking became an integral part of the …
Reactive Archey Target Design Team "Mimic", Brandon Croyle, Jacob Boss, David Rodgers, Austin Wivell
Reactive Archey Target Design Team "Mimic", Brandon Croyle, Jacob Boss, David Rodgers, Austin Wivell
Williams Honors College, Honors Research Projects
This design project will aim to provide archery hunters with a platform to simulate shooting at string jumping deer. String jumping refers to a spooked deer hearing the snap of a bow string and instintivly ducking up to ten inches. This often results in wounded or missed deer. We will design and build a control system that uses the sound of a bow string as a trigger to operate a mechanical target system. A sound sensor will mimic a deer’s hearing in close range hunting and then send a signal to the mechanical system to replicate the dropping motion of …
Engineering Success On The Field: A Reflection On The Epics Ironman Pediatric Prosthetic Project, Glynn Gallaway
Engineering Success On The Field: A Reflection On The Epics Ironman Pediatric Prosthetic Project, Glynn Gallaway
Purdue Journal of Service-Learning and International Engagement
Glynn Gallaway is a student in the Purdue Mechanical Engineering Class of 2020 with interests in the health care, assistive technology, and medical device industries. Glynn is from Dallas, Texas, and was inspired to pursue this career path through her interactions with youth with special needs. She joined the EPICS Ironman team in the fall of 2016 during her first year at Purdue as a part of the learning community. In this article, she discusses her experiences on the Ironman team creating a pediatric prosthetic for a young local athlete. The goal of the Ironman team is to create a …
A Perceptual Comparison Of “Black Box” Modeling Algorithms For Nonlinear Audio Systems, Paul G. Mayo
A Perceptual Comparison Of “Black Box” Modeling Algorithms For Nonlinear Audio Systems, Paul G. Mayo
Student Theses
Nonlinear systems identification is a widespread topic of interest, particularly within the audio industry, as these techniques are employed to synthesize black box models of nonlinear audio effects. Given the myriad approaches to black box modeling, questions arise as to whether an “optimal” approach exists, or one that achieves valid subjective results as a model with minimal computational expense. This thesis uses ABX listening tests to compare black box models of three hardware audio effects using two popular nonlinear implementations, along with two proposed modified implementations. Models were constructed in the Hammerstein form using sine sweeps and a novel measurement …
A Swing Generator Using Water Power Produced By The Wind, Ruka Ozaki
A Swing Generator Using Water Power Produced By The Wind, Ruka Ozaki
The International Student Science Fair 2018
I focus on various kinds of natural energy sources, especially wind. Wind power generation is the most-used method of electricity generation using wind power. Wind power generation has many merits; it achieves high efficiency of electric power generation, it can generate electricity even during the night, it doesn’t make any hazardous materials. However, there are not only merits but also demerits. It can cause bird strike, environment disruption from noise and low-frequency wave. And besides, we must comply building laws when we build wind power generators. Thus I built ‘a swing generator using water power produced by the wind power’, …
Rc Baja Car Suspension, Tyler Martin
Rc Baja Car Suspension, Tyler Martin
All Undergraduate Projects
This year the Mechanical Engineering Technology Department at CWU is holding an R/C Baja car competition using the same rules as the ASME competition. The designed car must compete in three separate events: the slalom course, drag race, and obstacle course. By not only completing, but also being competitive in each of the events, the car will be deemed a success. Suspension and steering are two essential components of any R/C car, and was the main focus for this report. The suspension must be able to support the car in the event of impacts. In addition, the steering must be …
Senior Project Hauff Tree Pruner, Brian Woolery
Senior Project Hauff Tree Pruner, Brian Woolery
All Undergraduate Projects
Neil Hauff, a business owner and entrepreneur from the Yakima valley challenged a team of engineering students from Central Washington University to design a motorized apple tree pruner. This report will discuss the engineering and construction that went into creating the housing of the tree pruner. The housing component needed to be able to protect the moving parts of the pruner, while withstanding the rotational torque produced by the Makita power drill used to drive the pruner. The biggest constraint in designing the housing was to keep the weight of the housing component under 1.5 lbs, while still keeping the …
Non-Intrusive Optical Measurement Of Electron Temperature In Near Field Plume Of Hall Thruster, Peter J. Urban
Non-Intrusive Optical Measurement Of Electron Temperature In Near Field Plume Of Hall Thruster, Peter J. Urban
ETD Archive
Currently there is a large interest in the use of more efficient means of propulsion in long term missions due to the costs and difficulties associated with placing and maintaining the needed fuel for conventional chemical systems in orbit. Mass reduction of upper stages will return large returns due to the great reduction in required lower stage fuel. Due to these factors, alternatives are undergoing active research, though this paper is concerned with the area of electrical propulsion. Electric propulsion is broadly defined as propulsion where the energization of the exhaust occurs via application of electromagnetic fields as opposed to …
Neuromuscular Reflex Control For Prostheses And Exoskeletons, Sandra K. Hnat
Neuromuscular Reflex Control For Prostheses And Exoskeletons, Sandra K. Hnat
ETD Archive
Recent powered lower-limb prosthetic and orthotic (P/O) devices aim to restore legged mobility for persons with an amputation or spinal cord injury. Though various control strategies have been proposed for these devices, specifically finite-state impedance controllers, natural gait mechanics are not usually achieved. The goal of this project was to invent a biologically-inspired controller for powered P/O devices. We hypothesize that a more muscle-like actuation system, including spinal reflexes and vestibular feedback, can achieve able-bodied walking and also respond to outside perturbations. The outputs of the Virtual Muscle Reflex (VMR) controller are joint torque commands, sent to the electric motors …
H.F. Hauff Pruner Cutting Blades, Wyley Stewart
H.F. Hauff Pruner Cutting Blades, Wyley Stewart
All Undergraduate Projects
Apple orchards are a critical component of agriculture in the United States, and keeping the apple trees in the best shape for optimum growth and production is hard work. Neil Hauff, an agriculture industry expert, challenged students at CWU to engineer a power assisted tree pruner. Across the country, apple orchards need pruned every season. The pruning of the trees is strenuous manual labor that requires many man hours. The proposed solution is to create a power assisted tree pruner that would minimize the amount of work needed to trim each tree branch. This project has been separated into three …
Effect Of Process Parameters On The Surface Roughness And Mechanical Performance Of Additively Manufactured Alloy 718, Bo Ryan Whip
Effect Of Process Parameters On The Surface Roughness And Mechanical Performance Of Additively Manufactured Alloy 718, Bo Ryan Whip
Browse all Theses and Dissertations
Metal additive manufacturing (AM) is a method to create complex components in a layer-by-layer process. Currently, there is a lack of understanding in the processing-structure-properties-performance relationship, particularly related to defects inherent to the AM process. This work investigates the relationship of process parameters, as-built surface roughness, and mechanical performance for nickel-based superalloy 718 built using laser powder bed fusion. The surface roughness of components built using varied processing parameters was characterized using both nondestructive and destructive measurement techniques. Finite element analysis was used to study the stress concentration on surface profiles. Statistical correlations are presented between contour processing parameters and …
Section 1: Thermal Sciences, Ectc Coordinating Committee
Section 1: Thermal Sciences, Ectc Coordinating Committee
Early Career Technical Journal (ECTJ)
Proceedings of the 18th Annual Early Career Technical Conference, November 3, 2018. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 1-32
Section 2: Numerical Methods, Ectc Coordinating Committee
Section 2: Numerical Methods, Ectc Coordinating Committee
Early Career Technical Journal (ECTJ)
Proceedings of the 18th Annual Early Career Technical Conference, November 3, 2018. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 33-70
Performance Of A Gravity Independent Heat Pipe, O Y W Abotsi, K Kaddoura, J P. Kizito
Performance Of A Gravity Independent Heat Pipe, O Y W Abotsi, K Kaddoura, J P. Kizito
Early Career Technical Journal (ECTJ)
Section 1: Thermal Sciences; pp. 3-10
Section 4: Materials, Ectc Coordinating Committee
Section 4: Materials, Ectc Coordinating Committee
Early Career Technical Journal (ECTJ)
Proceedings of the 18th Annual Early Career Technical Conference, November 3, 2018. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 91-117
Section 5: Mechanics, Ectc Coordinating Committee
Section 5: Mechanics, Ectc Coordinating Committee
Early Career Technical Journal (ECTJ)
Proceedings of the 18th Annual Early Career Technical Conference, November 3, 2018. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama; pp. 118-149
Cooling Of A Hot Substrate With Supersonic Nozzle, Rafit Kabir, Simon Esau, John Kizito
Cooling Of A Hot Substrate With Supersonic Nozzle, Rafit Kabir, Simon Esau, John Kizito
Early Career Technical Journal (ECTJ)
Section 1: Thermal Sciences; pp. 11-17
Proceedings Of The 18th Annual Early Career Technical Conference (Complete Issue), Ectc Coordinating Committee
Proceedings Of The 18th Annual Early Career Technical Conference (Complete Issue), Ectc Coordinating Committee
Early Career Technical Journal (ECTJ)
Proceedings of the 18th Annual Early Career Technical Conference, November 3, 2018. School of Engineering, University of Alabama at Birmingham, Birmingham, Alabama