Digital Commons Network^™

Initiative To Increase Student Engagement In Undergraduate Structural Analysis Course, Danielle Rose Flores, Diego Alberto Tomas

Architectural Engineering

This report documents the design of physical models, software aids, homework supplements, and industry-related activities to support the Learn by Doing philosophy in an undergraduate structural analysis lecture and laboratory course pairing offered at California Polytechnic State University, San Luis Obispo in the Architectural Engineering department. The ARCE 302 Structural Analysis and ARCE 352 Structural Computing Analysis courses cover the fundamentals of analyzing indeterminate structures, primarily focusing on theoretical concepts and calculations.

Prior to the development of any new course materials for this project, feedback from students who had previously taken the courses was collected via a survey in the …

High-Power Microwave Antenna Design, Luke C. Chase

Electrical Engineering

High-power microwave antennas are essential for defense industry radar systems, cyber warfare, and power transmission. The US Department of Defense a SBIR proposal specifying the need for a high-power phased-array microwave antenna for the US Air Force.

Vivaldi antennas, invented in 1978 by Peter Gibson, have been widely adopted for radar applications due to their high bandwidth and gain performance. Considerable amounts of research exists on designing Vivaldis for different applications ranging from radar to communications. Using antenna theory and past research, a new Vivaldi antenna was designed to meet the requirements mandated by the DoD research contract.

This project …

Exploration Of Software Defined Radios To Increase Capabilities Of Affordable Mesh Networks, Liam K. Mccarthy

Electrical Engineering

Project OWL is developing a LoRa mesh network “DuckLinks” for emergency communications, and the current LoRa protocol the Clusterduck Protocol is based on is severely limited in data rate. OWL plans to use Raspberry Pi computers to develop the next phase of Duck radios, which greatly opens the computing potential and flexibility of the system the Ducks run on. Using LimeSDR and GNU Radio, an open source SDR programming environment, this project seeks to develop a simple SDR-based packet transmission system that allows for communication with Duck radios as well as the use of a different modulation scheme for higher …

Prosthetic Forearm Controller, Claire Tylutki, Kevin Lopatka, Sofia Zaletel, Hardit Singh

Electrical Engineering

The EMG controlled prosthetic arm project represents a significant advancement in upper limb prosthetics, leveraging cutting-edge technology to address critical user needs. With over two million individuals in the United States living with limb loss, a substantial portion being upper limb amputees, the demand for accessible and functional prosthetic solutions is pressing. This project focuses largely on refining prosthetic limb control through the integration of electromyography (EMG) signal processing and control. Using surface electrodes, this project employs non-invasive means of data collection combined with modern digital signal processing methods to implement faster and more accurate control. The control system also …

Battery Energy Storage System, Alec C. Maclean, Kaylen H. Schwartz, Kyle A. Begley

Electrical Engineering

The project is a continuation of part 1 of the “Reliability Measurement for Grid-Connected Solar System” project. The goal is to continue where the previous design failed. This project will configure an ITECH IT-6000C and Tabuchi Battery Energy Storage System (BESS) to the small-scale microgrid at the Cal Poly, San Luis Obispo EE Department. Initially, a system was designed to connect an ITECH IT-M3633 as a PV solar source emulator to the Tabuchi BESS within a grid-connected microgrid system in Room 20-102 at Cal Poly. A Photovoltaic Thevenin equivalent model was developed for the ITECH IT-M3633, but this setup failed …

Ross Dam Micro Hydro Project, Marirose Evenden, Tyler Reents, Elena Ryan, Tevan Kim

Mechanical Engineering

The Ross Dam and reservoir in Angels Camp needs a reliable power source for powering its SCADA system which monitors its water level and flow rate. Currently, the existing hydro power supply is very unreliable and needs to be replaced with a micro hydro generator system that can consistently produce power to charge the onsite batteries. This paper details the design and implementation of a micro hydro Pelton wheel replacement system designed by our senior project team.

Outlined in this report is our design overview of the system and how our project will redesign and optimize the use of the …

Echoes Of Nature: Using Biodata Sonification To Model Electrical Communication In Plants, Penelope Anna Alioshin

Electrical Engineering

The use of biodata sonification as a tool to visualize biological data is a response to recent developments in the intersection of art and technology. This project explores the intersection by converting the electrical impulses given off by plants into audio signals. By processing and amplifying the voltage difference between two electrodes on a plant, its communication is quantified. The goal is to use this communication model as a tool to increase ecological awareness as well as improve machine learning models. A deeper understanding of non-human communication systems, specifically those that employ superposition decision matrices, could help to drastically increase …

Ross Dam Micro Hydropower Project, Ryan Pospichal, Wilson Szeto

Electrical Engineering

In 2020, Utica Water and Power Authority (UWPA) commissioned the development and installation of a micro hydropower system for Ross Dam in northern California. The micro-hydro system was intended to serve as a reliable source of renewable energy to power on-site equipment for monitoring the Ross Reservoir. Despite its innovative approach, the system encountered operational shortcomings, including frequent mechanical failures, rapid wear, and an inability to adapt to variable flow rates. To address these challenges, UWPA has commissioned interdisciplinary teams of Mechanical Engineering (ME) and Electrical Engineering (EE) students to redesign the micro hydropower system. The ME team was entrusted …

A 4-Switch Buck-Boost Dc/Dc Converter For Electric Vehicle Applications, Andrew Hudak, Ashley Schiller

Electrical Engineering

In this project, we develop a four switch buck-boost DC/DC converter that is to be integrated into a microgrid-inspired power distribution architecture for electric vehicles. The overall architecture includes DC/DC and DC/AC converters for bi-directional energy transfer between the DC and AC ports along with a communications port to control each energy interface. There is also the onboard battery and the internal combustion engine power exchange being done with DC/DC converters and AC/DC inverters to connect to the centralized DC bus. Hardware prototypes using an Arduino and Raspberry Pi for the 500 W DC/DC and DC/AC converters have been previously …

Multi-Hop And Automated Testing Of Wide-Area Network Radio Systems, Zachary C. Numa, Joseph S. Nuccio

Electrical Engineering

Requests for low-power and versatile wide-area Internet-of-Things (IoT) networks are becoming more prevalent with upcoming research in low-data rate ad-hoc mesh networks. Connections to terrestrial satellites have proven promising methods for increasing range capabilities for wide area networks (WAN). As research in communication with IoT networks and satellites progresses, reliable multi-hop mesh networks for Earth-based communication are still necessary to develop the base for satellite communication. These multi-hop communication mesh networks are being developed to allow communication where Line-of-Sight (LOS) from A to B is incapable due to environmental barriers. Hence, communication is possible without LOS by providing an intermediate …

2-Bit Schiffman Phase Shifter, Tavita Dayton, Enrique Ruiz

Electrical Engineering

Phase shifters are found in microwave/RF applications such as defense or wireless communications for their ability to control the relative phase of a system which allows for alignment of signals to obtain constructive interference. Typical phase shifters are chip level (digital and analog) which require a DC bias therefore restricting PCB use unless allowance for air gaps. The paper analyzes a passive and low-profile 2-bit phase shifter using the Schiffman architecture, which outputs a near-constant 90 degree shift over a wide band of frequencies. The design process initially confirmed a proper 90 degree phase shift over the desired WiFi band, …

Accessible Real-Time Eye-Gaze Tracking For Neurocognitive Health Assessments, A Multimodal Web-Based Approach, Daniel C. Tisdale

Master's Theses

We introduce a novel integration of real-time, predictive eye-gaze tracking models into a multimodal dialogue system tailored for remote health assessments. This system is designed to be highly accessible requiring only a conventional webcam for video input along with minimal cursor interaction and utilizes engaging gaze-based tasks that can be performed directly in a web browser. We have crafted dynamic subsystems that capture high-quality data efficiently and maintain quality through instances of user attrition and incomplete calls. Additionally, these subsystems are designed with the foresight to allow for future re-analysis using improved predictive models, as well as enable the creation …

The Wildland Firefighter Respiratory Protection Device, Oliver Pilon, Xaviera Pons, Calder Wood, Tommy Ozawa, Jack Adema, Payton Mayer

Biomedical Engineering

This paper presents the development of First Respire and their design of a powered air-purifying respirator (PAPR) specifically curated for wildland firefighter while simultaneously addressing the critical absence of respiratory protection for wildland firefighters operating in the challenging wildland-urban interface (WUI) environments. Current respiratory protection options, such as bandanas and N95 masks, fall short in providing adequate defense against toxic particulate matter and gases, exposing firefighters to increased risks of health complications, including cancers and respiratory diseases. Through collaborative efforts of the Wildfire Conservancy, the WUI Fire Institute at Cal Poly, and CAL FIRE, First Respire aims to create a …

Focused Led Sintering, Dylan Defazio, Nilav Maulik, Branden Majors, Michael Fontillas

Mechanical Engineering

This report provides a detailed overview of the final design of our light-emitting diode (LED) focusing system. Our system incorporates a converging lens and a specially designed "glass funnel," which acts as a thick fiber optic that narrows the light to a fine point through internal reflection. The glass components of our system are precisely housed in a part made using advanced computer-numeric controlled (CNC) Mill and CNC Lathe manufacturing processes. This ensures high precision and durability of the overall system. Our LED focusing system is designed with a 60-watt stage light. The decision to use a glass funnel as …

Port Adapter For Unported Pressure Sensors, Peter Kristjaan Tomson, Yasser Fahad Aldaoud, Terak Benjamin Hornik

Mechanical Engineering

Boundary layer research is an exciting and ever-changing field in fluid mechanics; thus, the need for high-quality empirical data is ever-growing in importance. Dr. Westphal, a professor at California Polytechnic State University, San Luis Obispo’s (Cal Poly) Mechanical Engineering Department in conjunction with Northrup Grumman is conducting just such research. Dr. Westphal has elected to make the change to pressure sensors that do not come with a built-in port to connect to pitot-static tubes. This necessitates a solution to adapt an unported pressure sensor to his testing apparatus which requires a tubed connection. This document outlines the Final Design Review …

Solar Farm, Parker Folsom, Jon Copeland, Julia Fay, Aiden Taylor

Mechanical Engineering

This senior project focused on creating a portable single-axis solar follower. The purpose of this solar follower is to allow for single-axis tracking of the sun at various points on our sponsor's property to gather information on solar power production. This data will be utilized to locate future sites for a utility-scale solar farm.

The final design of the solar follower comprises four subsystems: two legs, the frame, and the panel assembly. This modular design allows for portability and adjustability on challenging terrain. Following the design stage, our team purchased and manufactured all of the necessary components. All manufacturing work …

2024 Marine Energy Collegiate Competition, Nora Riedinger, Miles Mikkelsen, Brendan Stratford, Derek Tom, Zach Kwast, Harmon Yanikian-Sutton, Kennedy Urcelay, Tori Thomas, Brady Caron

Mechanical Engineering

PolyWave Energy is the second team from California Polytechnic University at San Luis Obispo to compete in the Marine Energy Collegiate Competition. PolyWave Energy consists of Mechanical Engineering, Electrical Engineering, and Business Administration students who have worked together from September 2023 to May 2024 on designing, building, and testing a marine power device to serve a selected market.

In response to the escalating concerns surrounding carbon emissions, climate change, and the depletion of fossil fuels, California Polytechnic State University’s Polywave Energy team has developed a sustainable and reliable energy source for Autonomous Underwater Vehicle (AUV) charging. Through extensive research of …

Scitechatorium Exhibit, Adam Khan, Cole Busch, Logan Femling, Alan Onuma

Mechanical Engineering

This document outlines the final stages of development and analysis of our interactive children’s exhibit for the Bellevue-Santa Fe Charter School’s SciTechatorium. We will showcase the final form of our ball and track display, giving a detailed look at each component and subsystem.

To describe how our final prototype will be built we have included a detailed manufacturing summary for our design. Our models have been designed with manufacturability in mind, and we have outlined which processes were used to produce all our parts.

There are also detailed descriptions of testing that were conducted to verify the performance of the …

Evaluating The Impact Of Sb 684 In San Luis Obispo, Andrew Darrell

City and Regional Planning

This study evaluates the impact of California Senate Bill 684 (SB 684) on housing development in San Luis Obispo. SB 684 aims to streamline the approval process for small-scale residential projects to address the state's housing shortage by promoting affordable housing construction. The aim of this report will be to examine the provisions of SB 684 and evaluate the feasibility of development under it. A general overview of the legislative provisions accompanied by legal context will provide a background to the law. Case studies of small lot development will illustrate design decisions that can be incorporated into new SB 684 …

Causal Inference Using Bayesian Network For Search And Rescue, Amanda Belden

Master's Theses

People who are considered missing have much higher probabilities of being found dead compared to those who are not considered missing in terms of Search and Rescue (SAR) missions. Dementia patients are incredibly likely to be declared missing, and in fact after removing those with dementia the probability of the mission being regarded as missing person case is only about 10%. Additionally, those who go missing are much more likely to be on private land than on protected areas such as forests and parks. These and similar associations can be represented and investigated using a Bayesian network that has been …

Modeling The Effectiveness Of Bioremediation On Methyl Tertiary-Butyl Ether In Groundwater, Logan Bundy

Master's Theses

Methyl tertiary-butyl ether (MTBE) and its degraded form tertiary-butyl alcohol (TBA) are both known carcinogens that have contaminated groundwater aquifers across the United States. MTBE is a synthesized compound, once widely used as an additive in gasoline to increase oxygenation. Because of its popularity, MTBE was released into the environment primarily through fuel combustion and leaking underground storage tanks. These two compounds are known to be recalcitrant to most conventional physico-chemical treatment methods. Previous studies have suggested that bioremediation is effective at degrading MTBE and TBA in contaminated groundwater. Bioremediation involves the injection of oxygen, nutrients, and pre-adapted bacterial cultures …

Short Arc Initial Orbit Determination For Leo Objects And The Impact Of Observation Eelevation On Predictive Accuracy, Alexis Digregorio

Master's Theses

The expansion of space activities has led to an increase in congestion. With this increase, there has been a growing emphasis on the importance of space situational awareness. Without it, the space environment can become hazardous, with increasing threats of collision and debris generation. As the utilization of space continues to grow, effective methods for tracking objects to maintain situational awareness must also be considered. One approach to tracking objects in space involves a series of steps, including optical observations and orbit estimations using initial orbit determination methods, followed by additional observations and continuous tracking. However, a challenge with this …

Manor & Meadow, Sydney Schultz

Graphic Communication

With the prevalence of DIY content on platforms like TikTok, many projects lack detailed guidance, making them challenging for individuals to replicate. By offering pre-packaged kits tailored to various interests and skill levels, this project seeks to democratize the DIY experience and empower users to unleash their creativity in a hassle-free manner.

Agriculture In The Middle School Classroom, Amy Prescott

Agricultural Education: Graduate Internship Reports

This internship consisted of substitute teaching in the San Luis Coastal Unified School District. Regular teaching assignments at Los Osos Middle School developed into a project designed to infuse agricultural concepts in core subjects at the school. The project involved developing lessons to be taught in humanities courses. Determining the impact of teaching agricultural content in the courses was included as a part of the project.

Graduate Internship Report Aged 539, Kylin Costa

Agricultural Education: Graduate Internship Reports

This internship and project report includes documentation required in meeting the quality criteria for secondary-level programs of instruction in agriculture. The contents of this project are concurrently used for the Agriculture Incentive Grant review process at Santa Ynez Valley Union High School. The supporting material includes information to receive state and local funding, outline the goals and objectives of the program, along with an overview of Santa Ynez High School, the agriculture program and the community.

Chioma Di Ulivo - Courtyard Canopy, Lilla J. Vigh, Claudia A. Geist

Architectural Engineering

Chioma di Ulivo ("Olive Tree Canopy") is the investigation and design of a canopy structure in the Engineering West (Bldg. 21) Hasslein Courtyard. The canopy will serve as a filtration system for both water and fallen olives from the olive tree on site, while providing a functional collaboration space for faculty and students alike. The goal of this project was to construct a quality diorama built by Lilla Vigh and Claudia Geist under the supervision of Dr. Craig Baltimore.

Polypropylene As Partial Fine Aggregate Substitute In Concrete, Samuel E. Royston, Chrisitan G. Achkar, Nicholas B. Tabarez

Architectural Engineering

The objective of this project is to discover a structurally effective method in repurposing recyclable plastic waste through its partial substitution for traditional fine aggregate in concrete.

Results obtained from analysis indicate a 25 percent compressive strength reduction with polypropylene at a 10 percent partial substitution for total sand content. This material successfully performed as an alternative, presenting a ductile mode of failure.

Three material alternatives - polypropylene, polyethylene, and rubber - were substituted for a percentage of sand. These materials underwent concrete cylinder crushing tests to determine their ultimate crushing strength, with the intent of identifying the most effective …

The Wall Group, Richard Antablin, Sara Engmyr, Michelle Griffith, Jora Leigh, Jesse Rainsdon

Architectural Engineering

This project aimed to design and construct an art wall in Poly Canyon to deter graffiti on existing structures and provide a designated area for student expression. However, after prolonged iterative revisions, it became evident that the project was significantly behind the original timeline.

It was recommended that the wall proposal be submitted for future student implementation. Instead of constructing the wall, an alternative course of action was proposed: restoring an existing structure in Poly Canyon to provide the desired hands-on experience.

After careful consideration, the Techite Bridge was selected for restoration. The proposed plan involves thorough cleaning, repairing chipped …

Smith Property Pre-Engineered Metal Barn, Trent Arjay Olmstead

Architectural Engineering

The Smith Residence Barn is a pre-engineered metal building designed to provide additional storage and workspace. The Architectural design was created by the Nunno Corporation, a San Luis Obispo based steel building general contractor. The soils report was created by Mid-Coast Geotechnical, INC. and the report’s conclusions were used for determining site conditions related to the foundation and lateral force system design. The structural calculations and plans were created by Trent Olmstead and reviewed by Brian Marc-Aurele, SE and Chris Murphy, SE. All calculations were done in accordance with the 2022 CBC, ASCE 7-16, 2023 AISC, ACI 318-19, and AISI …

The Wall Group, Richard Antablin, Sara Engmyr, Michelle Griffith, Jora Leigh, Jesse Rainsdon

Architectural Engineering

This project aimed to design and construct an art wall in Poly Canyon to deter graffiti on existing structures and provide a designated area for student expression. However, after prolonged iterative revisions, it became evident that the project was significantly behind the original timeline.

It was recommended that the wall proposal be submitted for future student implementation. Instead of constructing the wall, an alternative course of action was proposed: restoring an existing structure in Poly Canyon to provide the desired hands-on experience.

After careful consideration, the Techite Bridge was selected for restoration. The proposed plan involves thorough cleaning, repairing chipped …