Ratcheting Limit Assessment Of Straight Pipes Subjected To Combinedinternal Pressure And Reversed Bending Moments.Pdf, 2016 Wuhan Institute of Technology
Ratcheting Limit Assessment Of Straight Pipes Subjected To Combinedinternal Pressure And Reversed Bending Moments.Pdf, Xiaotao Zheng
Numerical Studies For Improving Fracture Toughness Resistance Curve Testing Using Single-Edge (Notched) Tension Specimens, 2016 The University of Western Ontario
Numerical Studies For Improving Fracture Toughness Resistance Curve Testing Using Single-Edge (Notched) Tension Specimens, Yifan Huang
Electronic Thesis and Dissertation Repository
The fracture toughness resistance curve, i.e. the J-integral resistance curve (J-R curve) or the crack tip opening displacement resistance (CTOD-R) curves, is widely used in the integrity assessment and strain-based design of energy pipelines with respect to planar defects (i.e. cracks). This thesis deals with issues related to the experimental determination of the J(CTOD)-R curves using the newly-developed single-edge (notched) tension (SE(T)) specimens. In the first study, the plastic geometry factor, i.e. the ηpl factor, used to evaluate J in a J-R curve test based on the SE(T ...
Mechanical Design And Optimization Of An Interactive Animatronic Bald Eagle, 2016 Georgia Southern University
Mechanical Design And Optimization Of An Interactive Animatronic Bald Eagle, Eric Burns
Phi Kappa Phi Research Symposium
Animatronics is a specialized sub-category of mechatronics, a fusion of mechanical and electrical engineering. The field has grown from small, individual projects into a major industry. As animatronics progress, mechanical engineers are pushed to design internal structures which occupy ever-decreasing spaces and to ensure designs can undergo maintenance and modifications smoothly. This research investigates methods of reducing space required for mechanisms and several other beneficial methods of development as well as varying satisfactions for audiences when exposed to actor-controlled systems rather than pre-scripted functions. The mechanical systems are designed using CAD software available at Georgia Southern. On-campus, resources are used ...
Designing And Building An Automatic Chamfer Grinder, 2016 Western Kentucky University
Designing And Building An Automatic Chamfer Grinder, William Johnson
Honors College Capstone Experience/Thesis Projects
Modern day manufacturing is a demanding environment with a constant need for process improvement. As automation becomes more advanced, there are fewer jobs that must be completed by a human. In the case of Stupp Bridge Company, a local manufacturer of steel bridge girders, their workforce is highly skilled, so replacing mundane tasks with automation allow the skilled workers to focus on the difficult jobs. One such task is grinding a chamfer onto every leading edge of each girder flange, eight edges in total, ranging from 20 to 200 feet long. The purpose of this project was to design an ...
Design Maps For Fracture Resistant Functionally Graded Materials, 2016 Rowan University
Design Maps For Fracture Resistant Functionally Graded Materials, Muhammad Ridwan Murshed
Theses and Dissertations
The objective of this research is to generate design maps to identify functionally graded microstructures with enhanced fracture toughness. Several Functionally Graded Materials (FGMs) with an edge crack and membrane loading are considered and the resulting J-integral values are computed numerically using Finite Element Analysis. In order to capture the resulting stress fields accurately, Barsoum elements are used in the vicinity of the crack tip and the simulations are carried out for several crack lengths (a) and material contrasts (κ). The averages of the J-integral values are used to determine the normalized Stress Intensity Factors which are then benchmarked with ...
Applied Strength Of Materials For Engineering Technology, 2016 Indiana University - Purdue University Fort Wayne
Applied Strength Of Materials For Engineering Technology, Barry Dupen
Manufacturing and Construction Engineering Technology Faculty Publications
No abstract provided.
Ultra-Light Bear Canister, 2016 California Polytechnic State University, San Luis Obispo
Ultra-Light Bear Canister, Naveen Beasley, Eli Rogers, Cory Wilson, Donald Wood
A bear canister is the primary tool used by outdoor enthusiasts to protect their food from bears while camping or backpacking. There are many effective products currently on the market, however many are not designed with reduced weight in mind. Hardcore backpackers want to have the lightest gear possible to ease the strain of carrying a large pack for sometimes weeks at a time.
Current bear canisters exist that utilize carbon fiber for weight reduction, however they rely on stock carbon tubes and lack engineering analysis, and no competitor has a fully composite bear canister available. Our sponsor, Nick Hellewell ...
Experimental Building Demonstration Model With Viscous Fluid Dampers, 2016 California Polytechnic State University, San Luis Obispo
Experimental Building Demonstration Model With Viscous Fluid Dampers, Blake Thomas Reeve, Brianna Jean Kufa, Aden Malek Stepanians, Sophie Carmion Ratkovich
The Architectural Engineering major places a heavy emphasis on structural dynamics and the role of wind and seismic loading in building analysis and design. Buildings of high importance that are critical to community function, such as hospitals, often utilize supplemental damping devices like supplemental viscous fluid dampers or base isolators to reduce the overall demands on the structural system. The design and analysis of these dampers are typically not taught at the undergraduate level, and is frequently performed by mechanical engineers, in lieu of structural engineers.
To better understand and research building behavior with supplemental damping devices, our multi-disciplinary team ...
Finite Element Modeling Of Delamination Damage In Carbon Fiber Laminates Subject To Low-Velocity Impact And Comparison With Experimental Impact Tests Using Nondestructive Vibrothermography Evaluation, 2016 California Polytechnic State University, San Luis Obispo
Finite Element Modeling Of Delamination Damage In Carbon Fiber Laminates Subject To Low-Velocity Impact And Comparison With Experimental Impact Tests Using Nondestructive Vibrothermography Evaluation, George Rodriguez Iv
Master's Theses and Project Reports
Carbon fiber reinforced composites are utilized in many design applications where high strength, low weight, and/or high stiffness are required. While composite materials can provide high strength and stiffness-to-weight ratios, they are also more complicated to analyze due to their inhomogeneous nature. One important failure mode of composite structures is delamination. This failure mode is common when composite laminates are subject to impact loading.
Various finite element methods for analyzing delamination exist. In this research, a modeling strategy based on contact tiebreak definitions in LS-DYNA®was used. A finite element model of a low-velocity impact event was created to ...
Physical Testing Of Potential Football Helmet Design Enhancements, 2016 California Polytechnic State University, San Luis Obispo
Physical Testing Of Potential Football Helmet Design Enhancements, Michael Jeremy Schuster
Master's Theses and Project Reports
Football is a much loved sport in the United States. Unfortunately, it is also hard on the players and puts them at very high risk of concussion. To combat this an inventor in Santa Barbara brought a new design to Cal Poly to be tested.
The design was tested in small scale first in order to make some preliminary conclusions about the design. In order to fully test the helmet design; however, full scale testing was required. In order to carry out this testing a drop tower was built based on National Operating Committee on Standards for Athletic Equipment, NOCSAE ...
Inter-Droplet Membranes For Mechanical Sensing Applications, 2016 University of Tennessee - Knoxville
Inter-Droplet Membranes For Mechanical Sensing Applications, Nima Tamaddoni Jahromi
This dissertation combines self-assembly phenomena of amphiphilic molecules with soft materials to create and characterize mechanoelectrical transducers and sensors whose sensing elements are thin-film bioinspired membranes comprised of phospholipids or amphiphilic polymers. We show that the structures of these amphiphilic molecules tune the mechanical and electrical properties of these membranes. We show that these properties affect the mechanoelectrical sensing characteristic and range of operation of these membrane transducers. In the experiments, we construct and characterize a membrane-based hair cell embodiment that enables the membrane to be responsive to mechanical perturbations of the hair. The resulting oscillations of membranes formed between ...
Particle Image Velocimetry Design & Installation, 2016 University of Arkansas, Fayetteville
Particle Image Velocimetry Design & Installation, Zach Ritchie
Mechanical Engineering Undergraduate Honors Theses
This work will mainly focus on the design, construction, and installation of the Particle Image Velocimetry (PIV) system in the Chemical Hazards Research Center wind tunnel. The PIV system utilizes a Class IV (double pulsed) laser, optics to produce a light sheet, timing circuitry, and a high-resolution camera (with buffered output) to measure a system’s velocity (two-dimensional) field by determining the displacement of particles over the time between laser pulses. For maximum mobility and functionality, the PIV system was installed in the center of the tunnel on a moveable cart with the laser and camera mounted to an adjustable ...
Drag Reduction Using Femtosecond Laser Surface Processing: Experimental Setup, 2016 University of Nebraska - Lincoln
Drag Reduction Using Femtosecond Laser Surface Processing: Experimental Setup, Derek Wallin, Henry Ems, Craig Zuhlke, Dennis R. Alexander, George Gogos, Sidy Ndao
UCARE Research Products
The experimental setup for developing a system to test the drag effects of different superhydrophorbicities. This is used to revise the current Moody Chart and redefine fluid drag in a pipe.
Fluid drag reduction is important in many applications such as reducing the power requirement to pump a fluid through a channel or pipe. The Center for Electro-Optics and Functionalized Surfaces (CEFS) at the University of Nebraska – Lincoln uses a femtosecond laser to functionalize 304 stainless Steel to become superhydrophilic or superhydrophobic The Processing produces microscale and nanoscale surface roughness that when treated with siloxanes becomes superhydrophobic. Small vortices form ...
Application Of A Multi-Zone Model For The Prediction Of Species Concentrations In Rapid Compression Machine Experiments, David Wilson
Master's Theses (2009 -)
Accurate chemical kinetic models, which predict species evolution and heat release rates in chemically reactive systems, are essential for further advancements in fuel and combustion technology. An experimental facility that is widely used for evaluating the accuracy of kinetic models is a rapid compression machine (RCM), which creates a well-defined reaction environment by compressing a reactive mixture inside a chamber. Generally, RCM experiments are conducted in order to obtain ignition delay data. However, chemical speciation data provides greater insight into reaction pathways, and is therefore a more rigorous benchmark for validating kinetic models. In order for a chemical kinetic model ...
Fracture Mechanics Of Ibration-Assisted Cutting Of Unidirectional Polymer Composites With Damaged Fibres.Pdf, 2016 The University of New South Wales
Fracture Mechanics Of Ibration-Assisted Cutting Of Unidirectional Polymer Composites With Damaged Fibres.Pdf, Weixing Xu, Liangchi Zhang Zhang
Design Principles For A Family Of Direct-Drive Legged Robots, 2016 University of Pennsylvania
Design Principles For A Family Of Direct-Drive Legged Robots, Gavin Kenneally, Avik De, D. E. Koditschek
Departmental Papers (ESE)
This letter introduces Minitaur, a dynamically running and leaping quadruped, which represents a novel class of direct-drive (DD) legged robots. We present a methodology that achieves the well-known benefits of DD robot design (transparency, mechanical robustness/efficiency, high-actuation bandwidth, and increased specific power), affording highly energetic behaviors across our family of machines despite severe limitations in specific force. We quantify DD drivetrain benefits using a variety of metrics, compare our machines' performance to previously reported legged platforms, and speculate on the potential broad-reaching value of “transparency” for legged locomotion.
For more information: Kod*lab.
Visual Servoing Of Quadrotors For Perching By Hanging From Cylindrical Objects, 2016 University of Pennsylvania
Visual Servoing Of Quadrotors For Perching By Hanging From Cylindrical Objects, Justin Thomas, Giuseppe Loianno, Kostas Daniilidis, Vijay Kumar
Departmental Papers (MEAM)
This paper addresses vision-based localization and servoing for quadrotors to enable autonomous perching by hanging from cylindrical structures using only a monocular camera. We focus on the problems of relative pose estimation, control, and trajectory planning for maneuvering a robot relative to cylinders with unknown orientations. We first develop a geometric model that describes the pose of the robot relative to a cylinder. Then, we derive the dynamics of the system, expressed in terms of the image features. Based on the dynamics, we present a controller which guarantees asymptotic convergence to the desired image space coordinates. Finally, we develop an ...
Suspension For Electrathon Vehicle, 2016 Central Washington University
Suspension For Electrathon Vehicle, Mackenzie Ericson Angeledes
All Undergraduate Projects
The purpose of this project was to develop a rear suspension system to support the frame of an Electrathon Vehicle. The vehicle is designed to compete in the Electrathon America competition on behalf of the Central Washington University Electric Vehicle Club. The suspension system was designed to use readily available parts sourced from manufacturers to keep the components serviceable. Using dynamic and static engineering analysis (spring equations, equations of equilibrium, stress calculations), the necessary custom components were designed. Space restrictions and limitations of the preexisting frame necessitated modifications, such as the straightness of the frame and the positioning of existing ...
Hydraulic Sprayer Boom Upgrade, 2016 Central Washington University
Hydraulic Sprayer Boom Upgrade, Chad R. Omlin
All Undergraduate Projects
Title and Author: Agriculture sprayer hydraulic boom upgrade by Chad Omlin (engineering Technologies, Safety, and Construction)
Abstract: Today’s agriculture industry is all about being the most efficient with your time, land, employees, and machinery. One thing that has made farming more efficient has been the use of hydraulics. Having a sprayer unit with manual booms is not being efficient with your time and/or employees. To make the sprayer unit more efficient, hydraulic cylinders were added. Sketched solutions were analyzed using statics and mechanics of materials principles. Drawings were completed for the successful analysis solutions. Solid works software was ...
Orchard Bin Atv Trailer, 2016 Central Washington University
Orchard Bin Atv Trailer, Neil F. Leitz
All Undergraduate Projects
A local orchardist was experiencing a problem that was being caused by their lack of apple picking bin moving equipment. The orchardist needed a well-engineered solution to this lack of equipment. The solution arrived at was a five bin trailer. There were multiple design requirements for this trailer, including the device needing to be able to interface with an ATV, be able to be loaded by hand, be able to carry five bins, and not exceed a budget of $750. While perfecting the design of the trailer, a number of different disciplines were utilized, which included dynamics, kinematics, static loading ...