Digital Commons Network^™

"Recloser And Circuit Breaker Controller.", Falak Patel, Ramon Jaramillo

Electrical Engineering

Electrical systems such as those used by utility companies to deliver power to residents are generally not perfect and thus can lead to many serious issues. One of which is fault current which is a current that flows when two conductors either make a short with each other or with ground. Fault current is unpredictable and extremely dangerous, as not only can it severely damage expensive equipment used by utility companies, but also risk the life and health of anybody in the vicinity. Where our project comes in is the need to monitor these electrical systems to check for faults …

Pre-Regulator Switching Converter For Photovoltaic Inverters, Lily Seymour, Stephen Alvarado

Electrical Engineering

The photovoltaic industry is constantly looking for more efficient and affordable methods to boost power generation and equipment lifetime. This project considers the design, simulation, fabrication, and testing of a DC-DC switching converter for pre-regulator photovoltaic system applications. The proposed converter is unique in that the solar array is divided up and switched between series and parallel instead of switching to charge and discharge a component for a desired duty cycle. This redesign of the conventional photovoltaic topology allows for more flexibility and control over the output voltage and current of the system, which ideally will protect the inverter from …

Battery Hardware Simulator, Kian N. Orang, Marcelo Garcia

Electrical Engineering

This project aims to develop a battery hardware simulator, which will serve as a tool for studying microgrids. The primary objective is to create a simulation system that can emulate various battery technologies that are used in microgrids, including lithium-ion and lead acid. By utilizing this battery simulator, Cal Poly students can safely test battery management systems and battery-sensitive electronics without the inherent risks associated with real batteries. Our project implemented this design with a 4-quadrant programmable power supply (ITECH) connected to an AP Systems grid tied inverter. The power supply acts as the battery which can receive or supply …

Development Of Multiple Input Single Output Dc-Dc Converter, Ryan Bailey, Miguel Carmona, Jose Velez-Lopez

Electrical Engineering

This senior project report details the testing and validation of the designed DC-DC Multiple Input Single Output converter. The MISO uses four-switch buck-boost topology to output a single 48V from multiple nominal 24V inputs. The previous iteration of the MISO was plagued with an overheating mosfet that would drastically reduce the lifespan of the boards and reduce efficiency. This newest iteration includes more ground panes to combat the issues. In addition, the 200W MISO board was redesigned to utilize an edge connector for secure installment, removal, and replacement in the actual DC House system panel. The slots also have a …

Wireless Energy Harvesting System, Matthew Palma, Audrey Toop, Andrew Fahey

Electrical Engineering

The modern world is built upon wireless transmission of data. The signals that carry this data travel through the air, an untapped source of power. Unreceived transmissions are dissipated into useless forms of energy when they should be reclaimed. Wireless electronics can theoretically be powered by harvesting energy from the electromagnetic signals in the wireless internet frequency band. The aim of this project is to develop a system to capture ambient energy, convert it into DC power, and store the power for later use. The product will consist of three subsystems: an antenna receiver, a rectifier and voltage-multiplier, and a …

Cal Poly Cubesat Lab Next Generation Systemboard, Austin S. Gnecco

Electrical Engineering

Cal Poly CubeSat Lab’s current “SystemBoard” or primary compute board that it flown on their satellites has been flying for over 15 years and is beginning to show it’s age. Many components onboarda are nearing obsolescence and are hard to source for new boards. In this project, the specifications for a new revision of CPCL’s core SystemBoard, named SystemBoard 3.0, were defined and designs were generated for a 1st generation prototype, as well as producing evaluation boards to test the developed subsystems before their integration into a final product. This project was necessary to ensure that CPCL can continue to …

Sky Survey Radio Telescope, Jack E. Mcguigan

Electrical Engineering

This document outlines the design of a radio telescope designed to perform hydrogen line sky surveys. The telescope produces radio images mapping the intensity and relative velocities of hydrogen concentrations to their sky coordinates. Over the course of a day, the telescope images the regions of space visible to it, allowing sky survey imagery to be updated daily. Sky survey images are comprised of an array of pixels corresponding to specific sky coordinates. Each 8-bit RGB pixel contains information on the concentrations of hydrogen in the brightness and relative velocity in the color. Radio images mapping the concentrations and velocities …

Spice Modeling Of Biosensing Field-Effect Transistor, Alex Castro

Electrical Engineering

This project created a user manual on how to generate an easily configurable and implementable Spice model for Field Effect Transistor (FET) devices created in the Cal Poly clean room. The document contained step by step procedures depicting the proper execution techniques and example results for different experiments required to gather the proper information for these models. This testing methodology was shown for finding the numerous different device parameters of a FET, including the I-V curves, threshold voltage, and subthreshold current values. The manual then described how to transfer this data into a new Spice model to allow for simulation …

Directional Speaker, Gabriel Tramontina Ceribelli, Vincent Trevor Pierce

Electrical Engineering

Parametric Acoustic Arrays (PAA) are highly directional soundwaves whose attenuation and spread are much less affected by distance from the source as compared to traditional speakers. A well-known application for PAA is the directional speaker. Studies show that noise directly affects health and decreasing noise pollution can help improve the quality of life for millions of people. Directional speakers can revolutionize society by coupling space with sound. This project encodes audio into two RF-Pulse Width Modulated (PWM) waves to drive a transducer array. Each RF-PWM wave interferes with the other in air to generate a Single Sideband (SSB) frequency spectrum …

Bearing Health Detector, Natalie N. Tokhmakhian, Alexander J. Davis

Electrical Engineering

Bearings, a common component in rotating machinery, are essential components of modern rotating machines; thus, monitoring their health is crucial when reducing downtime and boosting production efficiency. The Bearing Health Detector (BHD), a hand-held device, captures and processes the sound of a machine under test in real time and estimates the level of wear and tear by comparing the sound to previous tests. The BHD encompasses audiences involved with roller bearings in rotating machinery and is designed to provide the diagnosis of wear through the universal detection of good, satisfactory, and very poor with the following color scheme: green, yellow, …

Multi-Effects Analog Guitar Pedal, Carson J. Bryan

Electrical Engineering

The Multi-FX Analog Guitar Pedal includes the analysis, design, performance, PCB layout, and packaging of an industry-standard effects pedal for an electric guitar. This project takes an analog input signal and utilizes analog circuitry to give the user the option to customize the way that their playing sounds. Effects include the options to add equalization filtering and distortion. The EQ filtering will allow the user to attenuate or gain certain frequencies divided into the 3 standard audio bands: bass (20-300 Hz), middle (300-4000 Hz), and treble (4-20 kHz). The soft-clipping distortion stage will allow the user to move around the …

Intelligent Transportation Systems (Its): A Survey Of What It Is, What It Does, Where It Faulters, And Where To Go With It, Niklas Nordstrom

City and Regional Planning

The world of technology continues to find itself incorporated into an ever-expanding number of fields with a rapidly increasing number of applications. One of these is transportation, under the umbrella of Intelligent Transportation Systems (ITS). The intention of this application at a macro scale is to increase the surface transport safety, efficiency, and convenience. As technological improvements continue to be made, ITS grows in popularity and implementation, and is now found in many cities across the United States. Correct implementation of ITS could have huge benefits in the transportation sector, but without thinking about its implications now, there is a …

Thermal Inequity And Planning Practices: Uncovering The Linkages And Creating Equitable Mitigation Strategies, Elia Rosner

City and Regional Planning

This paper examines the ways in which historical planning practices have contributed to the unequal vulnerability of marginalized communities to extreme heat, resulting in thermal inequity. Historical planning practices including discriminatory policies and uneven resource allocation, have intensified the effect of the urban heat island (UHI), leading to increased exposure to extreme heat and its associated health risk. Understanding the correlation between planning practices and the UHI effect is crucial for developing effective strategies to mitigate extreme heat impacts and improve thermal equity. By analyzing the underlying factors and consequences of planning decisions, this research aims to inform policy makers, …

Three Rivers Community Town Center, Jamie Moffatt

City and Regional Planning

This project is an extension to the Community Planning courses in the City and Regional Planning Department, CRP 410 and 411. The project began in Fall 2022 and was completed in Winter 2023. The first quarter, the studio team worked with Three Rivers, California, which resulted in a thorough general plan background report for the community. The Tulare County Mountain Area Plan – Background Report, will be referenced throughout the project. The second quarter, the studio team switched directions and completed a five-year review for the Three River’s community, based on their community plan and the General Plan for Tulare …

Boulevard Apartments - Long Beach, Ca, Daryl P. Hernandez

City and Regional Planning

The proposed development will provide Long Beach residents with more opportunities for housing. The project is located on lots 923 and 927 Long Beach Boulevard in Long Beach, California. Currently, the lots are underutilized and vacant with no existing development on them. The apartment complex will consist of 75 units that include studio apartments, one-bedroom apartments, and two-bedroom apartments. An additional four units will be for qualified, low-income residents. The purpose of this development is to provide quality housing for young adults and families located in the heart of Long Beach.

Storytelling And Racial Identity: How First-Generation Students Of Color Navigate Their Identities At Predominately White Institutions, Kimberly Garcia Cruz

Communication Studies

Utilizing the Narrative Paradigm (Fisher, 1984) and thematic analysis (Braun & Clarke, 2006) the present study seeks to explore and further understand the ways in which first-generation students of color navigate, and thus make meaning, of their race and class identities at a Predominantly White Institution (PWI). Through qualitative interviews with 14 first-generation students of color (henceforth, FGSOC), themes that emerged included: (1) being used to “it”, (2) financial differences cause a clash with belonging, and (3) cultural spaces bring welcoming feelings. Findings were consistent with previous research regarding barriers faced by first-generation students of color. The current study adds …

University Rover Challenge, Dylan S. Tabalan, Daniel Xu, Logan Pascoe, Jake Stone

Mechanical Engineering

Our team has designed, created, and tested a base rover for the University Rover Challenge (URC), conducted by the Mars Society. The rover's design focuses on modularity and robustness, incorporating a chassis constructed from aluminum extrusions, a robust rocker-bogie suspension system, a six-wheel drive train, and basic controls. The choice of aluminum extrusions ensures modularity for future enhancements, while the rocker-bogie suspension system, commonly used in other competitive and actual Mars rovers, provides improved stability and maneuverability. Rover operations are governed by a server-client architecture, with an Xbox controller input providing an intuitive user interface for movement control. Comprehensive testing …

Drop Test Release Mechanism, Sophie M. Getty, Matthew A. Tichenor, Nash W. Levy, Connor D. Dilloughery

Mechanical Engineering

Many boxes for shipping undergo drop tests by the manufacturer to ensure their durability. Certain constraints are necessary to successfully carry out these tests such as not damaging the box prior to the drop and maintaining consistency throughout every drop.

Our team has designed a Drop Test Release Mechanism that addresses these constraints. It provides repetitive drops for different objects that vary in shape and size such as small electronics or parts. This device utilizes a soft-clamping mechanism that can release an object with minimal force applied onto it prior to drop. A frame made of 80/20 was designed to …

Animatronic Monarch Butterfly: Mechanical System, Janine Rae Moreno, Enrico Cruz, Alexia Murphy, Lakshmanan Muthukaruppan

Mechanical Engineering

This report describes the design, manufacturing, and design verification of an interactive animatronic monarch butterfly created by a team of mechanical and computer engineering students for the Girl Scouts of California's Central Coast. The purpose of the project is to engage Girl Scouts in learning about monarch butterflies and provide hands-on experience in robotics and STEM. The report covers design changes, manufacturing processes, and assembly of various components, including the butterfly body, wings, legs, and electronic housing. The software and electronics used in the project are also briefly discussed, as the computer engineering team was responsible for the software and …

Development Of A Low-Cost Acoustic Gauge For Simultaneous Tide And Wave Measurement, Alexander Kalman Dunn

Master's Theses

High-quality tide and wave data are essential in a variety of fields including coastal engineering, climate science, disaster response, and recreational activities. Accurate data are publicly accessible from government organizations such as the National Oceanic and Atmospheric Administration (NOAA), however the high costs associated with deploying and maintaining their high accuracy gauges results in a deficit of localized data. Commercial gauges available starting at $2,000 are still expensive for local agencies and individual users to deploy and maintain. These commercial options can also be limited in their scope, accuracy, or ease of use. In this thesis, a low-cost acoustic gauge …

A Resource Guide For Historic Sundown Town Resolutions, Zoning Code Updates, And General Plan Policies, Anna Rago

City and Regional Planning

James W. Loewen’s book Sundown Towns: A Hidden Dimension of American Racism, released in 2005, calls out cities across the United States for their historically discriminatory practices of excluding Black and other non-white individuals from living within city borders, either through formal exclusionary policies or informal methods. Cities often enforced this exclusionary practice through violence and intimidation, leading to “all-white” communities throughout the United States. The belief was that these communities should be “sundown” or “sunset” towns, where people of color were not allowed after dark. Loewen’s book and the following movement awakened individuals, companies, and entire cities to take …

Activetrans Priority Tool: An Analysis Of The San Luis Obispo Council Of Government’S Regional Transportation Plan Active Transportation Project List And Step-By-Step Methodology, William F. Daniels

City and Regional Planning

This is the first effort by SLOCOG to systematically rank and prioritize existing proposed active transportation projects through a GIS methodology across the county. The methodology demonstrates to member agencies and SLOCOG with a step-by-step approach to allocate limited resources to desired active transportation projects in an equitable way. The variables were selected by a Steering Committee. The report also includes suggestions for improved future analysis. This information can help to inform future plans and allocate funds.

The Regional Active Transportation Project Selection & Ranking Tool Methodology combines data from six factors to create a priority score. The six factors …

Morro Bay 2023 Non-Vehicular Circulation Plan, Jeremiah C. Rogers

City and Regional Planning

The Non-Vehicular Transportation in Morro Bay plan notes that bicycle and pedestrian circulation are vital aspects in bettering the city's lifestyle for both residents and visitors. These forms of transportation within the community help to promote local business and ecotourism (City of Morro Bay & JBG Consulting, LLC, 2012). This document describes the city of Morro Bay’s existing conditions, relevance to existing planning documents, case studies, as well as policies and implementation. The main goal of this plan is to improve the biking and walking conditions in Morro Bay and to create a non-vehicular transportation plan that is up to …

Itentifying Suitable Sites For The Rotating Safe Parking Program In San Luis Obispo, Finnegan James

City and Regional Planning

This report has been created with the intention of identifying a new Safe Parking location in the City of San Luis Obispo (SLO) for the Rotating Safe Parking Program. SLO currently has two Safe Parking locations, though one is being discontinued due to inadequacy of the site. The City wishes to identify a new location, or locations, that can replace this. This report came to life after coordination with the City to determine how this senior project could best support the City’s efforts to address homelessness in SLO in 2023. My work began when I identified areas in the Homelessness …

Gyroless Nanosatellite Attitude Determination Using An Array Of Spatially Distributed Accelerometers, Kory J. Haydon

Master's Theses

The low size and budget of typical nanosatellite missions limit the available sensors for attitude estimation. Relatively high noise MEMS gyroscopes often must be employed when accurate knowledge of the spacecraft’s angular velocity is necessary for attitude determination and control. This thesis derived and tested in simulation the “Virtual Gyroscope” algorithm, which replaced a standard gyroscope with an array of spatially distributed accelerometers for a 1U CubeSat mission. A MEMS accelerometer model was developed and validated using Root Allan Variance, and the Virtual Gyroscope was tested both in the open loop configuration and as a replacement for a gyroscope in …

Evaluation Of Potential Surrogates For Listeria Monocytogenes In Fresh Citrus-Specific Validation Studies, Kimiko Grace Casuga

Master's Theses

The FSMA Produce Safety Rule (PSR) requires citrus packers to more closely assess, manage, and monitor food safety risks. Although there have been no foodborne illness outbreaks and only one recall in fresh citrus, the risk of pathogens coming in on the fruit and cross contamination during washing still exists. Packhouses have dynamic washing systems and in-plant validations may be the only way to demonstrate compliance with the PSR. In-plant validations use surrogates in place of pathogens, and none have been identified or validated for citrus. The aim of this research was to identify a surrogate for use in fresh …

The Women Of Justice: Narratives Of Women Attorneys In California During The 1960s And 1990s, Sarah Zion

Master's Theses

This thesis interviews two women attorneys who have not previously shared their stories to relate their experience of going to law school and entering the field after graduation. The study of women lawyers and their stories is not a new topic, however, there is a focus in the scholarship to only explore the tales of the women who reached the big firsts, such as first female lawyer or first female judge. By providing interviews of women who have not reached these big accomplishments, the field gains a more rounded understanding of the history of female lawyers. The two women interviewed …

The Effect Of Irrigation On Dry-Farmed Vitis Vinifera L. Cv. Zinfandel As A Function Of Age, Jocelyn Alvarez Arredondo

Master's Theses

A one-year study was conducted in the Central Coast of California at a commercial vineyard to evaluate the effect of supplemental irrigation on dry-farmed Vitis vinifera L. cv. Zinfandel with varying vine ages during the 2021 growing season. The experimental block was historically dry-farmed on own-rooted Zinfandel vines, older vines were replaced as production quality decreased with a genetically identical scion grafted onto St. George (Vitis vinifera Scheel) rootstock. Six total treatments were included in this study, with Young vines (5 to 12 years old), Old vines (40 to 60 years old), and Control (2:1 ratio of old to …

Reducing Scope 3 Emissions By Investing In Regenerative Agriculture In Supply Chains, Stephanie Cain

Master's Theses

The agricultural industry has an opportunity to shift to a more sustainable practice that helps restore vital topsoil, improve water quality, reduce environmental impact, and sequester atmospheric carbon into the vast soil carbon pool. However, to implement these practices at considerable scale, agricultural producers require access to resources and capital they rarely have and can be difficult to acquire. As a company, investing in regenerative agriculture in supply chains can lead to reduced Scope 3 emissions, more resilient supply chains, and better marketability as an investment fund, an employer, and a brand. Insetting regenerative agriculture can protect supply chains against …

Food For Thought: The Effects Of Feeding On Neurogenesis In The Ball Python, Python Regius, Hannah F. Bow

Master's Theses

Pythons are a well-studied model of postprandial physiological plasticity. Consuming a meal has been shown by past work to evoke a suite of physiological changes in pythons and elicit one of the largest documented increases in post-feeding metabolic rates relative to resting values. However, little is known about how this plasticity manifests in the brains of ball pythons, Python regius. Previous work using the cell-birth marker 5-bromo-12’-deoxyuridine (BrdU) has shown that cell proliferation in the python brain increases six days following meal consumption. This study aimed to confirm these findings and build on them in the long term by …