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

Mechanical Engineering Commons™

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

2013

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 31 - 60 of 1209

Full-Text Articles in Mechanical Engineering

Fixture For Carbon Fiber Spar Of Human Powered Helicopter, David John Ikeda, Luis Gonzalez Dec 2013

Fixture For Carbon Fiber Spar Of Human Powered Helicopter, David John Ikeda, Luis Gonzalez

Industrial and Manufacturing Engineering

The following report describes our contribution to Cal Poly Human Powered Helicopter for the 2012 competition for the Sikorsky Prize offered by the American Helicopter Society. In order to win this prize the team needs to build and fly a human powered helicopter for more than 60 seconds reaching and altitude of 3 meters while staying in a 10 meter square box. Our team was created to support the integration of Carbon Fiber parts, specifically the carbon fiber spars with rotor and landing gears. Precise cutting and accurate drilling was needed and our team was tasked with creating a fixture …

Go to article

Ole Miss Engineer 2013-2014 Dec 2013

Ole Miss Engineer 2013-2014

Ole Miss Engineer

No abstract provided.

Go to article

Loading Path Determination For Tube Hydroforming Process Of Automotive Component Using Apdl, E. Masoumi Khalil Abad, Amir Ghazanfari, R. Hashemi Dec 2013

Loading Path Determination For Tube Hydroforming Process Of Automotive Component Using Apdl, E. Masoumi Khalil Abad, Amir Ghazanfari, R. Hashemi

Faculty Publications, Mechanical Engineering

In this study, an extended stress-based forming limit diagram (FLD) for prediction of necking based on the Marciniak and Kucznski (M-K) model is represented and applied in tube hydroforming. The bulge forming of a straight tube is simulated by finite element method and verified with published experimental data. This adaptive simulation technique is based on the ability to detect the onset and growth of defects (e.g., bursting and wrinkling) and to promptly readjust the loading paths. Thus, a suitable load path is determined by applying Adaptive Simulation Method in ANSYS Parametric Design Language (APDL).

Go to article

Phonon Transport Analysis Of Semiconductor Nanocomposites Using Monte Carlo Simulations, Mayank Malladi Dec 2013

Phonon Transport Analysis Of Semiconductor Nanocomposites Using Monte Carlo Simulations, Mayank Malladi

All Theses

Nanocomposites are composite materials which incorporate nanosized particles, platelets or fibers. The addition of nanosized phases into the bulk matrix can lead to significantly different material properties compared to their macrocomposite counterparts. For nanocomposites, thermal conductivity is one of the most important physical properties. Manipulation and control of thermal conductivity in nanocomposites have impacted a variety of applications. In particular, it has been shown that the phonon thermal conductivity can be reduced significantly in nanocomposites due to the increase in phonon interface scattering while the electrical conductivity can be maintained. This extraordinary property of nanocomposites has been used to enhance …

Go to article

Crack Growth Behavior Under Creep-Fatigue Conditions Using Compact And Double Edge Notch Tension-Compression Specimens, Santosh B. Narasimha Chary Dec 2013

Crack Growth Behavior Under Creep-Fatigue Conditions Using Compact And Double Edge Notch Tension-Compression Specimens, Santosh B. Narasimha Chary

Graduate Theses and Dissertations

The American Society for Testing and Materials (ASTM) has recently developed a new standard for creep-fatigue crack growth testing, E 2760-10, that supports testing compact specimens, C(T), under load controlled conditions. C(T) specimens are commonly used for fatigue and creep-fatigue crack growth testing under constant-load-amplitude conditions. The use of these specimens is limited to positive load ratios. They are also limited in the amount of crack growth data that can be developed at high stress intensity values due to accumulation of plastic and/or creep strains leading to ratcheting in the specimen. Testing under displacement control can potentially address these shortcomings …

Go to article

Kolsky Bar Experiment For High-Rate Large Deformations Of Polycarbonate, Jason Gerald Vogeler Dec 2013

Kolsky Bar Experiment For High-Rate Large Deformations Of Polycarbonate, Jason Gerald Vogeler

Department of Engineering Mechanics: Dissertations, Theses, and Student Research

Polycarbonate (PC) is a tough, transparent engineering thermoplastic. Its impact strength and ability undergo large plastic deformations without shatter make PC an ideal protective material for impact-resilient eyewear, aircraft windows and transparent armor. A good understanding of the response of this material to large deformations at high strain rates is critical for its utilization in these applications. To this end, a striker-less Kolsky bar device is employed in this work for the needed material characterization. The apparatus allow impulsive torsion and/or compression loadings with pulse durations sufficiently long for the plastic flow behavior to develop fully. Three new testing techniques …

Go to article

Physics Trick - Balanced Can, Said Shakerin Dec 2013

Physics Trick - Balanced Can, Said Shakerin

All Faculty Articles - School of Engineering and Computer Science

The ordinary 12-oz beverage cans in the figures below are not held up with any props or glue. The bottom of such cans is stepped at its circumference for better stacking. When this kind of can is tilted, as shown in Fig. 1, the outside corners of the step touch the surface beneath, providing an effective contact about 1 cm wide. Because the contact is relatively wide and the geometry is symmetrical, it is easy to balance an empty can by simply adding an appropriate amount of water so that the overall center of mass is located directly above the …

Go to article

The Effects Of Wrist Orthoses On The Stiffness Of Wrist Rotations, Daniel Brad Seegmiller Dec 2013

The Effects Of Wrist Orthoses On The Stiffness Of Wrist Rotations, Daniel Brad Seegmiller

Theses and Dissertations

Wrist orthoses are the most common upper limb orthoses, being used by thousands of individuals each year to stabilize, immobilize, or support the wrist joint. Wrist orthoses achieve their function by altering the stiffness of the wrist joint (Figure 1-1). However, there is no quantitative understanding of how wrist orthoses affect wrist stiffness, and consequently, wrist orthosis development often relies on feel, intuition, or empirical heuristics rather than a methodical, quantitative approach. Because wrist movement control is dominated by wrist joint stiffness (Charles and Hogan 2011) a quantitative understanding of how wrist orthoses alter the stiffness of the wrist is …

Go to article

Subway Rail Car Filter Sampling Tool, Brian Hong, Julia Pollard, Philip Ybarra Dec 2013

Subway Rail Car Filter Sampling Tool, Brian Hong, Julia Pollard, Philip Ybarra

Mechanical Engineering

The following design report has been prepared by Team Slice for both Cal Poly’s Mechanical Engineering Department and Lawrence Livermore National Laboratory. This report provides an overview of the design ideation process of creating a subway rail car filter sampling tool. This cutting tool will take samples of HVAC filters from subway railcars in New York City, NY. These samples will then be used for processing in biological terror emergency response situations. This device will provide an easy, safe, and user friendly tool to cut filter samples. The current method of cutting is a pair of scissors or shears, which …

Go to article

Computer Controlled Vegetable Oil Fuel System, Joseph W. Souza Dec 2013

Computer Controlled Vegetable Oil Fuel System, Joseph W. Souza

Mechanical Engineering

No abstract provided.

Go to article

Active Learning Using Model-Eliciting Activities And Inquiry-Based Learning Activities In Dynamics, Jeffrey Phillip Georgette Dec 2013

Active Learning Using Model-Eliciting Activities And Inquiry-Based Learning Activities In Dynamics, Jeffrey Phillip Georgette

Master's Theses

This thesis focuses on a year-long project of implementing active learning in undergraduate dynamics courses at Cal Poly San Luis Obispo from 2012-2013. The purpose is to increase conceptual understanding of critical dynamics concepts and to repair misconceptions of the students. Conceptual understanding in Dynamics is vital to understanding the big picture, building upon previous knowledge, and better understanding the behavior of engineering systems. Through various hands-on activities, students make predictions, test their conceptions, and solve real world problems. These active learning methods allow students to improve their learning of Dynamics concepts. Education research on active learning is present in …

Go to article

Large-Displacement Lightweight Armor, Eric C. Clough Dec 2013

Large-Displacement Lightweight Armor, Eric C. Clough

Master's Theses

Randomly entangled fibers forming loosely bound nonwoven structures are evaluated for use in lightweight armor applications. These materials sacrifice volumetric efficiency in order to realize a reduction in mass versus traditional armor materials, while maintaining equivalent ballistic performance. The primary material characterized, polyester fiberfill, is shown to have improved ballistic performance over control samples of monolithic polyester as well as 1095 steel sheets. The response of fiberfill is investigated at a variety of strain rates, from quasistatic to ballistic, under compression, tension, and shear deformation to elucidate mechanisms at work during ballistic defeat. Fiberfill’s primary mechanisms during loading are fiber …

Go to article

The Collapsible Trailer: Design And Manufacture, Robert Hobson Dec 2013

The Collapsible Trailer: Design And Manufacture, Robert Hobson

Biomedical Engineering

No abstract provided.

Go to article

Analytical Solutions For A Large-Scale Long-Lived Rotating Layer Of Fluid Heated Underneath, Pouya Jalilian Dec 2013

Analytical Solutions For A Large-Scale Long-Lived Rotating Layer Of Fluid Heated Underneath, Pouya Jalilian

Masters Theses

In this work, the system of equations for a large- scale long lived rotating layer of fluid with the deformable upper free surface and non-deformable lower free surface heated underneath has been reviewed and derived. The quasi-geostrophic approximation, the beta effect and the method of multi-scale expansions have been employed to and as a result, an equation governing the evolution of large-scale perturbations, has been derived. The effect of each term present in the upper surface deformation equation has been analyzed and the analytical solutions have been obtained by virtue of employing auxiliary Riccati equation method. The soliton solutions obtained …

Go to article

Implementation And Analysis Of A 1.4l Turbo Liquid Cooled Cac And Ac Condenser System, Mitchell Zajac Dec 2013

Implementation And Analysis Of A 1.4l Turbo Liquid Cooled Cac And Ac Condenser System, Mitchell Zajac

Masters Theses

This project report serves as a continuation and finalization of an overall experience with the design process including working on the development of system components, working with automotive industry leaders, suppliers and dealing with the aspects of business and production feasibility. The development of a dual level cooling concept to apply Centro Richerche Fiat established components on a Chrysler Group vehicle application was the foundation of the design project completed in December 2012 by Matt Cutler and Mitch Zajac. The development of this system aimed to decrease overall vehicle power consumption, minimize overall system packaging space, and to increase vehicle …

Go to article

Waveguiding Of Surface Phonon Polariton, Franklin Manene, Brian A. Lail, Edward C. Kinzel Dec 2013

Waveguiding Of Surface Phonon Polariton, Franklin Manene, Brian A. Lail, Edward C. Kinzel

Mechanical and Aerospace Engineering Faculty Research & Creative Works

Metal losses lead to unacceptably low propagation lengths in THz and LWIR waveguides. While SPP based waveguides provide relatively good confinement and attenuation in the near-IR and visible these are insufficiently bound to the surface in the THz and LWIR. We study using surface phonon polaritons for waveguiding at these frequencies. An eigenmode approach was applied to model a hybrid waveguide structure at λ=10.6 μm. The results show that phonon-coupled hybrid waveguide of silicon carbide BCB and gold exhibit enhanced propagation length and confinement at LWIR. © 2013 IEEE.

Go to article

Experimental Investigation Of The Active Flow Control On A Two-Dimensional Wind Turbine Airfoil, Guannan Wang Dec 2013

Experimental Investigation Of The Active Flow Control On A Two-Dimensional Wind Turbine Airfoil, Guannan Wang

Dissertations - ALL

Wind turbine blades experience unsteady aerodynamic loading under various off-design conditions. The fatigue loading reduces the operational time of the wind turbine hence leads to an increase in the Cost of Energy (CoE) of the wind power. In this study, active flow control with unsteady blowing actuators was applied to a two-dimensional wind turbine airfoil to alleviate the unsteady aerodynamic loading and improve the aerodynamic performance, particularly under large scale freestream disturbances. A low speed, open jet aeroacoustic wind tunnel was designed and constructed based on an existing anechoic chamber for this investigation. A theoretical analysis based on a Blade …

Go to article

Wind Tunnel Testing And Numerical Simulation On Aerodynamic Performance Of A Three Bladed Savonius Wind Turbine, Khandakar Niaz Morshed, Mosfequr Rahman, Gustavo Molina, Mahbub Ahmed Dec 2013

Wind Tunnel Testing And Numerical Simulation On Aerodynamic Performance Of A Three Bladed Savonius Wind Turbine, Khandakar Niaz Morshed, Mosfequr Rahman, Gustavo Molina, Mahbub Ahmed

Mechanical Engineering: Faculty Publications

The purpose of this research work is to investigate experimentally and computationally the feasibility of improving the performance of the vertical-axis Savonius wind turbine. The authors first performed a series of wind tunnel investigations on semi-cylindrical three-bladed Savonius rotor scale models with different overlap ratios and without overlap. These experiments were conducted in front of a low-speed subsonic wind tunnel at different Reynolds numbers. Pressures around the concave and convex surfaces of each blade, as well as the static torque for the rotor models, were measured. Using these experimental data, the authors calculated aerodynamic characteristics such as drag coefficients, static …

Go to article

In-Bottle Wine Aerator, Kevin Kesler, Patrick Lowry, Paul Woolworth Dec 2013

In-Bottle Wine Aerator, Kevin Kesler, Patrick Lowry, Paul Woolworth

Mechanical Engineering

The proposal for Capitol Cultivators discusses and evaluates the development of an in-bottle wine aerator. It defines the problem and need for an aerator located inside the wine bottle. Additionally, it outlines requirements essential for an effective design and describes the engineering process that will be followed.

Go to article

Design Of An Automatic Wood Trimming Machine, Van Ho, Nicholas Maskal, Andrew Rutland Dec 2013

Design Of An Automatic Wood Trimming Machine, Van Ho, Nicholas Maskal, Andrew Rutland

Mechanical Engineering

This final design report, prepared for Sunrise Arts by the Cal Poly design team Mahogany Automation, details the year-long process in which the team of three engineering students designed and built an automated wooden -plank edge trimming machine that incorporates anti-jamming and continuous loading features. The team has examined current woodworking machines and features available on the industrial and commercial market, and used these as guides along with device requirements set by the project sponsor, Bruce Palmer. The focus has been on designing the simplest and most cost effective device that allows operators to make production runs of wooden slats …

Go to article

Peripheral Artery Catheter Tracking System, Chris Blecher, Michael Lashore, Nhan Le Dec 2013

Peripheral Artery Catheter Tracking System, Chris Blecher, Michael Lashore, Nhan Le

Mechanical Engineering

No abstract provided.

Go to article

Rifle And Shotgun Recoil Test System, Benjamin Canfield-Hershkowitz, Trevor Foster, William Meijer Dec 2013

Rifle And Shotgun Recoil Test System, Benjamin Canfield-Hershkowitz, Trevor Foster, William Meijer

Mechanical Engineering

No abstract provided.

Go to article

Trampoline And Bungee Fatigue-Test Machine, Andy Brock, Christopher D'Elia, Ryan Murphy Dec 2013

Trampoline And Bungee Fatigue-Test Machine, Andy Brock, Christopher D'Elia, Ryan Murphy

Mechanical Engineering

JumpSport, a Saratoga based recreational and fitness trampoline company, sponsored this senior project team towards the development of a fatigue-testing machine. The goal of this project was to iterate the previous machine JumpSport used for bungee cord, spring, and trampoline fatigue testing. Since minimal study had been conducted on these specific bungee cords, the fixture was designed to confirm the theoretical correlations for rubber and perform the final tests according to a strict protocol. Operating with a specific test protocol in mind will allow the data from multiple tests to be combined and analyzed statistically. With a design concept in …

Go to article

Sodhana Environmental - Final Design Report, Eric Taylor, Corissa Bellis, Cody Perez, Cameron Zeller Dec 2013

Sodhana Environmental - Final Design Report, Eric Taylor, Corissa Bellis, Cody Perez, Cameron Zeller

Mechanical Engineering

A fully designed cost-effective, sustainable, toilet for the developing world.

Go to article

Otto - The Wall Driving Platform, Cameron Venancio, Eric Mar, Kelvin Lei Dec 2013

Otto - The Wall Driving Platform, Cameron Venancio, Eric Mar, Kelvin Lei

Mechanical Engineering

A robotic wall-climbing robot.

Go to article

Automated Foosball Table Year 1: Final Project Report, Juan David Gutierrez-Franco, John Inlow, Jesse Graham, Larry Huang Dec 2013

Automated Foosball Table Year 1: Final Project Report, Juan David Gutierrez-Franco, John Inlow, Jesse Graham, Larry Huang

Mechanical Engineering

This project is a first iteration of an automated foosball table designed and created using servomotors provided by Yaskawa to create an interactive tradeshow display where guests can play against the algorithms developed in the PLC (programmable logic controller) controlling the servomotors. There will be a second iteration of the project done by a different team directly following this one. The motion components were selected with the intent to be able to surpass the reaction times and speeds of expert human players. There are a total of eight servomotors, four controlling linear actuators for translation of rods, and four controlling …

Go to article

Prototype Device For The Detection Of Subsurface Peach Pit Fragments, Colby Lippincott, Hamilton Little, Rick Hayes, Elliot Wenzel Dec 2013

Prototype Device For The Detection Of Subsurface Peach Pit Fragments, Colby Lippincott, Hamilton Little, Rick Hayes, Elliot Wenzel

Mechanical Engineering

Peach pits can break during processing into several small fragments and are difficult to see and remove from the peach. Wawona Frozen Foods is asking for a fully designed, built and tested prototype that can detect these pit fragments with ease and speed. Our design uses an array of needles that puncture into a peach half. A pressure sensor measures the force on the needles and determines whether or not each needle hit the peach flesh or a pit fragment. The array of needles consists of 313 needles each with a diameter of 0.6 mm with a total array diameter …

Go to article

Characterization Of Polyetherimide Under Static, Dynamic, And Multiple Impact Conditions, Bryan Zuanetti Dec 2013

Characterization Of Polyetherimide Under Static, Dynamic, And Multiple Impact Conditions, Bryan Zuanetti

HIM 1990-2015

The application of polymers in robust engineering designs is on the rise due to their excellent mechanical properties such as high fracture toughness, specific strength, durability, as well as, thermal and chemical resistances. Implementation of some advanced polymeric solids is limited due to the lack of available mechanical properties. In order for these materials to endure strenuous engineering designs it is vital to investigate their response in multiple loading rates and conditions. In this thesis, the mechanical response of polyethermide (PEI) is characterized under quasi-static, high strain rate, and multiple impact conditions. Standard tension, torsion, and compression experiments are performed …

Go to article

Fracture Toughness Of A Hyperelastic Material During Surgical Cutting, Kevin Smith Dec 2013

Fracture Toughness Of A Hyperelastic Material During Surgical Cutting, Kevin Smith

HIM 1990-2015

Despite being one of the most important organs of vertebrates, the material properties of skin are also one of the most poorly understood. In the field of designing medical devices and surgical tools there are significant advantages to having a model that describes the interaction of forces between a blade tip and skin during surgical cutting. In general, skin can best be described as a composite layer consisting of a viscoelastic dermis with interwoven collagen and elastin fibers beneath a superficial epidermis. The purpose of this research is to study the fracture toughness of porcine skin during practical cutting applications, …

Go to article

Development And Validation Of An Absorption Sensor For Time-Resolved Measurements Of Co And Co2, Kyle Thurmond Dec 2013

Development And Validation Of An Absorption Sensor For Time-Resolved Measurements Of Co And Co2, Kyle Thurmond

HIM 1990-2015

A sensor was developed for simultaneous measurements of carbon monoxide and carbon dioxide fluctuations in internal combustion engine exhaust gases. This sensor utilizes low-cost and compact LEDs that emit in the 3-5[micro]m wavelength range which are more appropriate for practical applications than the more traditionally used lasers. An affordable, fast response sensor that can measure these gases has broad application that can lead to more efficient, fuel flexible engines and regulations of harmful emissions. LEDs have a more spectrally broad and diverging emission than lasers which presented many design challenges. The optical design software ZEMAX was utilized to overcome these …

Go to article

First Prev Next Last