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Articles 301 - 330 of 389
Full-Text Articles in Engineering
Metals Additive Manufacturing Powder Aging Characterization, Thomas Russell Lovejoy, Nicholas Karl Muetterties, David Takeo Otsu
Metals Additive Manufacturing Powder Aging Characterization, Thomas Russell Lovejoy, Nicholas Karl Muetterties, David Takeo Otsu
Mechanical Engineering
The metallic additive manufacturing process known as selective laser melting requires highly spherical, normally distributed powder with diameters in the range of 10 to 50 microns. Previous observations have shown a degradation in powder quality over time, resulting in unwanted characteristics in the final printed parts. 21-6-9 stainless steel powder was used to fabricate test parts, with leftover powder recycled back into the machine. Powder samples and test specimens were characterized to observe changes across build cycles. Few changes were observed in the physical and mechanical properties of the specimens, however, there were indications of chemical changes across cycles. Potential …
Development Of Robust Control Techniques Towards Damage Identification, Ryan J. Madden
Development Of Robust Control Techniques Towards Damage Identification, Ryan J. Madden
ETD Archive
Robust control techniques have enabled engineers to create uncertain models which are able to describe any differences between the model and experimental system with uncertainties defined as a combination of exogenous inputs and plant perturbations. Subsequently, robust model validation techniques arose to provide a guarantee that the uncertain model is able to recreate all observed experimental data. As a result, the complete model set is robust to any model inaccuracies or external noise. At the same time, the technique of model-based identification was developed in the robust control framework to identify the dynamics resulting from unmodeled or under-modeled components in …
Ultra Light Split Board Bindings, Jared Van Putten
Ultra Light Split Board Bindings, Jared Van Putten
All Undergraduate Projects
A split board binding is used to link two halves of a theoretically cut in half snow board together and fasten an alpine touring boot used for both skiing and mountaineering in place. The binding is removable so that one can alpine tour uphill on skins and be assembled at the top so that the rider can link both halves of the board together and bind their alpine touring ski boot into place to the split board. The binding system is required to be ultra light for Alpine Touring purposes and still be strong enough to withstand the rigors of …
Cascade Control Of A Hydraulic Prosthetic Knee, Xin Hui
Cascade Control Of A Hydraulic Prosthetic Knee, Xin Hui
ETD Archive
A leg prosthesis test robot with hydraulic knee actuator is modeled and tested with closed loop control simulation. A cascade control architecture is designed for the system, the outer loop is controlled by a robust passivity-based controller (RPBC) and the inner loop is controlled by an optimization method. The control algorithm provides knee angle tracking with an RMS error of 0.07 degrees. The research contributes to the field of prosthetics by showing that it is possible to find effective closed loop control algorithm for a newly proposed hydraulic knee prosthesis. The simulations demonstrate the efficiency of RPBC's ability to control …
Experimental Investigation Of Turbulent Flow Induced By New-Generation Wind Fences With Multi-Scale Fractal Structure, Sarah M. Mcclure
Experimental Investigation Of Turbulent Flow Induced By New-Generation Wind Fences With Multi-Scale Fractal Structure, Sarah M. Mcclure
ETD Archive
Understanding and controlling atmospheric boundary-layer flows with engineered structures, such as porous wind fences or windbreaks, has been of great interest to the fluid mechanics and wind engineering community. Previous studies found that the regular mono-scale grid fence of 50% porosity and a bottom gap of 10% of the fence height are considered to be optimal over a flat surface. Significant differences in turbulent flow structure have recently been noted behind multi-scale fractal wind fences, even with the same porosity. In this study, wind-tunnel tests on the turbulent flow and the turbulence kinetic energy transport of 1D and 2D multi-scale …
A Simulation And Experimental Study Of Active Disturbance Rejection For Industrial Pressure Control, Xiaoxu Li
A Simulation And Experimental Study Of Active Disturbance Rejection For Industrial Pressure Control, Xiaoxu Li
ETD Archive
The quality of control loop is very important in hydraulic machineries, where pressure must be accurately regulated in the presence of various disturbances. Proportional-Integral-Derivative (PID) control has dominated the industry for a long time and it is by far the most popular general purpose controller for pressure control. The purpose of this study is to conduct a simulation and experimental study comparing PID with an emerging new technology, namely active disturbance rejection control (ADRC). For the purpose of this study, an experimental testbed similar to those used in industry settings is used; its mathematic model is derived and used in …
Characterization Of Performance Of A 3d Printed Stirling Engine Through Analysis And Test, Julie Vodhanel
Characterization Of Performance Of A 3d Printed Stirling Engine Through Analysis And Test, Julie Vodhanel
ETD Archive
This thesis involves the fusion of two technologies, Stirling engines and additive
manufacturing. The project began by building a Stirling engine primarily out of 3D printed parts. Methods to measure the power output were designed and built with a combination of 3D printed and off the shelf parts. The Stirling engine was tested to see if there was a correlation to analysis results, and a regenerator was installed to determine the effect on performance for this relatively low temperature engine. Finally, variations in test operation and the use of heat sinks were used to find a combination that will allow …
Hybrid Particle Image Velocimetry With The Combination Of Cross-Correlation And Optical Flow Method, Mark Bradley Johnson
Hybrid Particle Image Velocimetry With The Combination Of Cross-Correlation And Optical Flow Method, Mark Bradley Johnson
Browse all Theses and Dissertations
Particle Image Velocimetry (PIV) has been of relevant discussions lately as the equipment used to obtain temporally and spatially resolved flow fields have advanced rapidly. Despite these advancements, the accuracy of evaluating these images have yet to exceed expectations. Current techniques typically utilize one method, either correlation based (frequently) or optical flow (non-frequently), and both are vulnerable to specific conditions incorporated in the PIV images. Only through the combination of two methods, cross correlation and optical flow, can a technique benefit from the strengths of each method while concealing the flaws each individual method contains. The Hybrid Particle Image Velocimetry …
Design, Fabrication, And Testing Of A 3d Printer Based Microfluidic System, Carlton A. Mcmullen
Design, Fabrication, And Testing Of A 3d Printer Based Microfluidic System, Carlton A. Mcmullen
Graduate Theses and Dissertations
A pneumatically actuated PDMS based microfluidic devices were designed and fabricated by soft-lithography. Two types of molds were fabricated out of different material for this experiment. The first mold, (device 1), was fabricated from a sheet of Polymethyl methacrylate (PMMA) material, similar to Plexiglas. The device features were micro-engraved onto the face of the material. The second mold, (device 2), was fabricated from the use of fused deposition modeling (FDM) 3D printing. The pumping efficiency of the PDMS devices was analyzed through the characterization of the micro-pumps flowrate with respect to the pumps driving pressure and the actuation frequency. Tested …
Skyport: Payload: Medical Cooler For The Skyport Uav, Madison Gee, Hector Lopez, Victor Magaña
Skyport: Payload: Medical Cooler For The Skyport Uav, Madison Gee, Hector Lopez, Victor Magaña
Mechanical Engineering Senior Theses
Access to basic healthcare is a major persisting problem around the globe, especially in rural parts of the world. One of the many facets of this problem is access to vaccine treatment. The transportation and storage of vaccines at the proper temperature is an issue that is still being solved and improved upon today. One of the common solutions to this problem is the use of passive coolers such as ice packs and other refrigerants. The potential issue with passive cooling is that the temperature cannot be actively controlled. This is evident, as many vaccines are wasted due to incorrect …
Automated In-Row Weed Trimmer, Joshua Baculi, Tyler Castrucci, Joshua Ding, Marit Knapp, Gaston Young
Automated In-Row Weed Trimmer, Joshua Baculi, Tyler Castrucci, Joshua Ding, Marit Knapp, Gaston Young
Mechanical Engineering Senior Theses
The Automated In-Row Weed Trimmer, or AIRWT, is a weed removal system designed to be used in vineyards in order to enable safe and e cient removal of weeds while preventing damage to the vines. The goal of the system is to reduce the need for the use of manual labor and herbicides while improving production rates of grapes by automating the weed removal process at vineyards. By implementing an automated system for weed removal, the team aims to resolve ethical issues in food production, primarily those surrounding human labor, environmental friendliness, and social sustainability. The focus of this report …
Skyport Airframe: Design And Manufacturing, Thomas Clark, Michael Dewane, Siosiua Faleta, Robert Llanos-Hinson
Skyport Airframe: Design And Manufacturing, Thomas Clark, Michael Dewane, Siosiua Faleta, Robert Llanos-Hinson
Mechanical Engineering Senior Theses
Many rural areas of developing countries lack the necessary transportation infrastructure to have reliable access to basic needs. This is particularly true for medical supplies. To combat the issue of insufficient access to vaccines in developing areas, the SkyPort project has developed the SkyPort UAV (Unmanned Aerial Vehicle). The SkyPort UAV has the vertical takeoff and landing (VTOL) capabilities of a quadcopter, as well as the efficient, sustained flight of a fixed-wing aircraft. It provides a cheaper, quicker, and safer delivery method than existing alternatives for vaccines in areas that lack a reliable transportation infrastructure. The role of the SkyPort …
Sunplanter, Matthew Diaz, Joseph Gaither, Stephen Hight, J. Brandon Suehiro
Sunplanter, Matthew Diaz, Joseph Gaither, Stephen Hight, J. Brandon Suehiro
Mechanical Engineering Senior Theses
Although the cost of solar technology has been reduced by nearly seventy percent in the last ten years, the cost of implementing solar panels for residential and commercial use has remained stagnant. Due to the lack of affordable, easily installable solar panel systems on residential properties, the goal of our Senior Design Project is to design a stand-alone solar tracking structure. Since the system is stand-alone, it can be easily implemented on a wide range of properties in most areas of California. Our design for the support of the solar tracking system is a two-pole structure, with a wide base …
Legacy Borehole Project, Piper Connelly, Rhys Marks, Ronald Saavedra
Legacy Borehole Project, Piper Connelly, Rhys Marks, Ronald Saavedra
Mechanical Engineering Senior Theses
To assist scientists in their pursuit of important research of the subseafloor, the Legacy Borehole Project designed a unique structure that will be lowered to the ocean floor for data collection beneath the ocean floor. This derrick structure will provide support for a sensor package to access pre-existing boreholes, deep and narrow holes drilled into the Earth's crust beneath the sea floor. Our team has completed the second year effort of the three-year plan. In this paper we detail our work on the structure, which will be assembled on a ship's deck and lowered onto the borehole reentry cone with …
Rsl Autonomous Rover, Cris Madrigal, Jiachi Zhang, Nicholas Peacock, Brogan O'Hara
Rsl Autonomous Rover, Cris Madrigal, Jiachi Zhang, Nicholas Peacock, Brogan O'Hara
Interdisciplinary Design Senior Theses
Autonomous vehicles are useful for a variety of applications such as military, urban, and agricultural environments. This paper discusses adding an autonomous navigation system to an all-terrain vehicle by implementing controllers that interface with its current system, installing sensors on the vehicle for obstacle detection, and developing effective safety mechanisms to prevent injury to others. The result is a vehicle capable of waypoint navigation and obstacle avoidance. Testing the vehicle showed that the LIDAR and the autonomous navigation system were integrated seamlessly, and that the sensor output signals were successfully translated into vehicle commands the existing system uses. This system …
Proof Of Concept Planetary Lander Test Article, Aja Hartman, Heather Montgomery, Shane Hereford, Grant Goyette
Proof Of Concept Planetary Lander Test Article, Aja Hartman, Heather Montgomery, Shane Hereford, Grant Goyette
Mechanical Engineering Senior Theses
The goal of this proof of concept planetary lander is to safely deliver an exploration rover to a planet surface. This lander was designed to be used as the last stage of landing in the existing entry, descent, and landing procedures used in previous Mars missions. The design improved upon past missions to Mars by reducing risk of failure during landing by utilizing a passive system with no electronics or control systems while also increasing landing site accuracy. These goals were accomplished by incorporating external crushable materials and internal damping systems. Five drop tests of our final design were completed. …
Mobile Music: A Musical Therapy Assistance Device, Alex Hildebrand, Tanner Malkoff
Mobile Music: A Musical Therapy Assistance Device, Alex Hildebrand, Tanner Malkoff
Interdisciplinary Design Senior Theses
Children suffering from Cerebral Palsy often undergo gait therapy in order to strengthen and coordinate their trunks and legs. The patients often feel unmotivated to perform their gait training because the physical movements associated with it are difficult and there is no immediate reward. Physical therapists (PT) will often play music as an incentive to get the children focused on their physical therapy, but this is inefficient and impedes the PT from analyzing and tuning the patients' gait. Mobile Music is a small device designed for automating musical therapy during gait training. In this paper, we go through several design …
Might-E Wheel, Abigail Grills, Daniel Doke, Jared O'Rourke, Zach Jesberger
Might-E Wheel, Abigail Grills, Daniel Doke, Jared O'Rourke, Zach Jesberger
Interdisciplinary Design Senior Theses
Electric bikes are proving to be an increasingly reliable source of transportation, but with large price tags and existing conversion kits proving too complicated and unapproachable for the average user, commuters are failing to consider electric bicycles as an option. A prototype of a wireless, rear-wheel replacement to convert a bicycle from manual to full-power electric was built. This motorized wheel is called Might-E Wheel. Might-E Wheel was designed as the most approachable and user-friendly way to convert a bicycle from manual to full-power electric. Might-E Wheel was able to achieve a top speed of 27.5 km/h, a range of …
Akabot 2.0: Pet 3d Printing Filament From Waste Plastic, Jay Dubashi, Brian Grau, Alex Mckernan
Akabot 2.0: Pet 3d Printing Filament From Waste Plastic, Jay Dubashi, Brian Grau, Alex Mckernan
Mechanical Engineering Senior Theses
Extrusion is how 3D printing filament is created. Melted plastic is pushed through an extrusion die and is shaped into a long thin strand of plastic. Extrusion machines are usually sized for industrial use, capable of creating hundreds of feet of filament a day. This filament is expensive to purchase, and many end-users would prefer to extrude their own filament, from a virgin plastic input or plastic waste input. There are no homescale filament extruders on the market for Polyethylene Terephthalate (PET) plastic waste. AkaBot was designed to allow end users to produce their own filament from a PET plastic …
One-Ride Human Powered Vehicle, Alex Fisher, Alex Sahyoun, Geoffrey Schmelzer, Brendan Taylor, C.J. Toy
One-Ride Human Powered Vehicle, Alex Fisher, Alex Sahyoun, Geoffrey Schmelzer, Brendan Taylor, C.J. Toy
Mechanical Engineering Senior Theses
This document discusses the design, analysis, manufacturing and testing of the One-Ride human powered vehicle which was entered into the 2015 ASME West Coast HPVC Competition. The goal of the vehicle is to entice people to switch from gas powered vehicles to the One-Ride for trips of up to 20 miles round trip. The One-Ride design features fully adjustable seating and steering positions and was designed to fit anyone between the heights of 5'2" and 6'4" comfortably. The seat is adjusted using metal sliders, manufactured in the SCU machine shop, which fit into brackets attached to the frame. The bike …
Uavino, Matthew Belesiu, Aaron Chung, Kirby Linvill, Nathan Carlson, Phillip Coyle, Megan Peekema
Uavino, Matthew Belesiu, Aaron Chung, Kirby Linvill, Nathan Carlson, Phillip Coyle, Megan Peekema
Interdisciplinary Design Senior Theses
UAVino is a drone solution that uses aerial imagery to determine the overall plant health and water content of vineyards. In general, the system focuses on automating crop inspection by taking aerial imagery of a vineyard, conducting post-processing, and outputting an easily interpreted map of the vineyard's overall health. The project's key innovation is an auto-docking system that allows the drone to automatically return to its launch point and recharge in order to extend mission duration. Long term, UAVino is envisioned as a multi-year, interdisciplinary project involving both the Santa Clara University Robotics Systems Laboratory and local wineries in order …
Transcatheter Heart Valve Subassembly Device, Adam Aslam, Matthew Bezkrovny, Daniel Degree
Transcatheter Heart Valve Subassembly Device, Adam Aslam, Matthew Bezkrovny, Daniel Degree
Mechanical Engineering
No abstract provided.
Seat Jack, Justin Worden
Seat Jack, Justin Worden
Mechanical Engineering and Technology Senior Projects
Many people around the world struggle with mobility. One of the biggest obstacles for who may struggle in this area is the simple task of moving from a sitting position to their feet. For some, this is the only thing that keeps them from walking around. Creating a portable device to help move a person from their chair to their feet would extremely aid the efforts of completing this simple task at any given moment. This report provides a proposed solution for this simple reoccurring task that countless people painfully struggle with every day. In order to make this device …
Improved Tennis Racquet Stringer, William Ligon Bruno
Improved Tennis Racquet Stringer, William Ligon Bruno
Mechanical Engineering and Technology Senior Projects
What design change to a conventional ATS Sports model drop-weight stringer can be made to decrease the stringing time for a tennis racquet? To answer this, a detailed analysis on design, manufacturability, and structural integrity was done to design a product that is manufacturable within the timeframe and produces a device which decreases the stringing time. First, an analysis on each vital component was done including the ratcheting components, pressure arm/drop mass, etc. Second, a virtual model was created with auxiliary components to test different designs. Through this analysis and the virtual model it was indicated that a duel stringing …
Collapsible Bicycle Frame, Keith Stone
Collapsible Bicycle Frame, Keith Stone
Mechanical Engineering and Technology Senior Projects
There are many situations where people could choose to ride a bicycle, whether it is to go to school, to a job, to meet with friends, or just for recreational purposes. However, once people reach their destination and have a break between their trips, they are left with a bicycle with little means of storing it while they go about their day. Some people buy a bike lock so that they can secure it in a safe location, while others may just lean it against a wall or even roll it into the building with them. However, according to FBI …
Methods For Determining Grease Service Levels In An Ah-64d Intermediate Gearbox Using On-Board Sensors, Travis Steven Edwards
Methods For Determining Grease Service Levels In An Ah-64d Intermediate Gearbox Using On-Board Sensors, Travis Steven Edwards
Theses and Dissertations
The intermediate gearbox (IGB) on the AH-64D was chosen as the subject for this study based on the persistent grease leaks that require grounding aircraft. The aircraft is not currently equipped with a method of detecting grease loss during flight, so techniques for analyzing the usefulness of old metrics and possible new techniques can be tested. The main objective of this study is to use the aircraft’s on-board sensors to develop a method of determining the lubrication level of the IGB. Currently, the most reliable method for detecting a fault on the aircraft is through the use of vibration-based condition …
Snowboard, Ski, And Skateboard Sensor System Application, Adrien Doiron, Michael Fernandez, Victor Ojeda, Robert Ross
Snowboard, Ski, And Skateboard Sensor System Application, Adrien Doiron, Michael Fernandez, Victor Ojeda, Robert Ross
Mechanical Engineering Senior Theses
The goal of this project was develop a sensor for the commercial market for skiers, snowboarders, and skateboarders that can give them the data such as speed, elevation, pressure, temperature, flex, acceleration, position, and other performance data such as trick characterization. This was done by using a variety of sensors, including a GPS, flex sensors, accelerometer, and others to provide data such as speed, position, position, and temperature. The sensors were placed in an external polycarbonate casing attached to the ski or board by using an adhesive pad on the bottom of the casing. These sensors then transmit the data …
Workspace Analysis Of A Linear Delta Robot: Calculating The Inscribed Radius, Michael Louis Pauly
Workspace Analysis Of A Linear Delta Robot: Calculating The Inscribed Radius, Michael Louis Pauly
Graduate Theses - Mechanical Engineering
One of the most important traits of a robotic manipulator is its work envelope, the space in which the robot can position its end effector. Parallel manipulators, while generally faster, are restricted by smaller work envelopes [1]. As such, understanding the parameters defining a physical robot’s work envelope is essential to the optimal design, selection, and use of robotic parallel manipulators. A Linear Delta Robot (LDR) is a type of parallel manipulator in which three prismatic joints move separate arms which connect to a single triangular end plate [2]. In this study, general inverse kinematics were derived for a linear …
Induction Phone Charger Case, Dante Eley, Nicholas Mason, Laurence Pringle
Induction Phone Charger Case, Dante Eley, Nicholas Mason, Laurence Pringle
Mechanical Engineering Senior Theses
This report discusses the project of creating a manual charging phone case for smartphones by means of electromagnetic induction. In today's world, smartphones are being used on the go more often, creating an increased demand for battery life. The capacity of current batteries cannot keep up with the constant usage of data in such activities as emailing, social media, apps, and more. We developed an efficient, ergonomic, and aesthetically pleasing phone case that can manually charge a smartphone without an electrical outlet, but by means of electromagnetic induction. This product would target two main demographics: business people who are constantly …
Aeroponic Test Bed For Hypergravity Research, Shane Brunner, Theron Hawley, Mike Nichols, David Patzelt, Kurt Sprouse
Aeroponic Test Bed For Hypergravity Research, Shane Brunner, Theron Hawley, Mike Nichols, David Patzelt, Kurt Sprouse
Mechanical Engineering Senior Theses
Taking one pound of food to space costs over $10,000. A plant growth chamber in space would help reduce the cost of transporting food by creating a healthy, long-term source of food that can be used for extended space missions. Currently, there is a lack of knowledge in gravity response mechanisms of plants to facilitate employing such a system. The overarching goal of this project is to add to the current body of knowledge related to growing plants in space by conducting research regarding the effect of hypergravity on cherry belle radish growth. To successfully accomplish this goal, an aeroponic …