Engineering Commons^™

Portable Dac And Headphone Amplifier For High Impedance Headphones, Kevin V. Thai

Electrical Engineering

The following paper contains an in-depth report on the design process of a portable DAC and Amplifier for high impedance headphones. The project brings portability into an audiophile’s world. This portable DAC and Class D amplifier takes USB data from a phone, converts it to analog, and amplifies the signal for high impedance headphones. First, the document contains motivations for the project: such as the necessity for such equipment, and who would use this product. Next, discussions of marketing considerations and customer needs bring together specifications. After, the report examines the project plan, overall functionality blocks, and estimated costs. Finally, …

Geometry-Based Mass Grading Of Mango Fruits Using Image Processing, M. A. Momin, Md Towfiqur Rahman, M. S. Sultana, C. Igathinathane, A. T. M. Ziauddin, T. E. Grift

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Mango (Mangifera indica) is an important, and popular fruit in Bangladesh. However, the post-harvest processing of it is still mostly performed manually, a situation far from satisfactory, in terms of accuracy and throughput. To automate the grading of mangos (geometry and shape), we developed an image acquisition and processing system to extract projected area, perimeter, and roundness features. In this system, images were acquired using a XGA format color camera of 8-bit gray levels using fluorescent lighting. An image processing algorithm based on region based global thresholding color binarization, combined with median filter and morphological analysis was developed …

Sap: Improving Continuous Top-K Queries Over Streaming Data, Rui Zhu, Bin Wang, Xiaochun Yang, Baihua Zheng, Guoren Wang

Research Collection School Of Computing and Information Systems

Continuous top-k query over streaming data is a fundamental problem in database. In this paper, we focus on the sliding window scenario, where a continuous top-k query returns the top-k objects within each query window on the data stream. Existing algorithms support this type of queries via incrementally maintaining a subset of objects in the window and try to retrieve the answer from this subset as much as possible whenever the window slides. However, since all the existing algorithms are sensitive to query parameters and data distribution, they all suffer from expensive incremental maintenance cost. In this paper, we propose …

Deepmon: Mobile Gpu-Based Deep Learning Framework For Continuous Vision Applications, Nguyen Loc Huynh, Youngki Lee, Rajesh Krishna Balan

Research Collection School Of Computing and Information Systems

The rapid emergence of head-mounted devices such as the Microsoft Holo-lens enables a wide variety of continuous vision applications. Such applications often adopt deep-learning algorithms such as CNN and RNN to extract rich contextual information from the first-person-view video streams. Despite the high accuracy, use of deep learning algorithms in mobile devices raises critical challenges, i.e., high processing latency and power consumption. In this paper, we propose DeepMon, a mobile deep learning inference system to run a variety of deep learning inferences purely on a mobile device in a fast and energy-efficient manner. For this, we designed a suite of …

Demo: Deepmon - Building Mobile Gpu Deep Learning Models For Continuous Vision Applications, Loc Nguyen Huynh, Rajesh Krishna Balan, Youngki Lee

Research Collection School Of Computing and Information Systems

Deep learning has revolutionized vision sensing applications in terms of accuracy comparing to other techniques. Its breakthrough comes from the ability to extract complex high level features directly from sensor data. However, deep learning models are still yet to be natively supported on mobile devices due to high computational requirements. In this paper, we present DeepMon, a next generation of DeepSense [1] framework, to enable deep learning models on conventional mobile devices (e.g. Samsung Galaxy S7) for continuous vision sensing applications. Firstly, Deep-Mon exploits similarity between consecutive video frames for intermediate data caching within models to enhance inference latency. Secondly, …

Webapirec: Recommending Web Apis To Software Projects Via Personalized Ranking, Ferdian Thung, Richard J. Oentaryo, David Lo, Yuan Tian

Research Collection School Of Computing and Information Systems

Application programming interfaces (APIs) offer a plethora of functionalities for developers to reuse without reinventing the wheel. Identifying the appropriate APIs given a project requirement is critical for the success of a project, as many functionalities can be reused to achieve faster development. However, the massive number of APIs would often hinder the developers' ability to quickly find the right APIs. In this light, we propose a new, automated approach called WebAPIRec that takes as input a project profile and outputs a ranked list of web APIs that can be used to implement the project. At its heart, WebAPIRec employs …

Design Of A Compact Helical Counterflow Heat Exchanger, Aravindakshan Thirumalai Ananthanpillai

Theses and Dissertations

Compact heat exchangers are desirable in many aerospace applications. New additive manufacturing approaches, such 3D printing, have enabled the fabrication of heat exchange devices utilizing geometries that cannot be fabricated using traditional approaches. The new geometries enabled by 3D printing may result in higher heat transfer using smaller devices, however, constraints associated with the fabrication of these devices also impose potential performance degradations. This document presents the design and analysis of a novel, compact counter flow heat exchanger which uses helically shaped passages to enhance the effectiveness of the heat transfer. Although the helical passages increase the heat transfer and …

Scan: Multi-Hop Calibration For Mobile Sensor Arrays, Balz Maag, Zimu Zhou, Olga Saukh, Lothar Thiele

Research Collection School Of Computing and Information Systems

Urban air pollution monitoring with mobile, portable, low-cost sensors has attracted increasing research interest for their wide spatial coverage and affordable expenses to the general public. However, low-cost air quality sensors not only drift over time but also suffer from cross-sensitivities and dependency on meteorological effects. Therefore calibration of measurements from low-cost sensors is indispensable to guarantee data accuracy and consistency to be fit for quantitative studies on air pollution. In this work we propose sensor array network calibration (SCAN), a multi-hop calibration technique for dependent low-cost sensors. SCAN is applicable to sets of co-located, heterogeneous sensors, known as sensor …

The Natural Aging Behavior Of Open-Die-Forged 7050 Aluminum Alloy, Casey J. Madsen, Joseph J. Redfearn

Materials Engineering

The aging response of open-die-forged 7050 aluminum was studied at various temperatures. This is of interest because the alloy can potentially crack during stress relief if it ages after its heat treatment. Natural aging limits the ductility enough to potentially cause cracking and is combatted by placing the forgings in freezers. This experiment shows which temperatures successfully inhibit aging in the forgings. The goal was to develop a maximum time that a sample can be stored at certain temperatures before the forgings have naturally aged. The samples were first solution heat treated then water-quenched. Next, the samples were stored at …

Kinked Tensile Behavior Of Cold Worked Nitinol, Grant R. Caraway, Samuel J. Canovas

Materials Engineering

To characterize the decrease in ductility caused by an induced stress concentration as a function of various levels of cold work and heat treatment, Nitinol medical guide wires with a .004″ diameter were tested using both a standard, straight tensile test and a modified, bent tensile test. The ratio of the two break loads (bent:straight) for identically processed samples was used as a proxy for measuring the ductility of the guide wires: the higher the ratio, the more ductile the sample. The average break load ratio as a function of increased cold work, decreased from 1.27 to 0.91 for the …

Qualification Of Blue Laser Cutting Tool And Design Of Test Procedure For Determining Cutting Parameters, Gaia Righi

Materials Engineering

No abstract provided.

Invariant-Based Method For Improving Efficiency Of Mechanical Testing In Aerospace Certification Of Carbon Fiber-Epoxy Composites, Alyssa Rina Gruezo, Erika Gabrielle Hansen

Materials Engineering

The current challenge with qualification of carbon fiber composites in the aerospace industry would be the low efficiency of testing hundreds of samples. The Trace Theory strives to streamline the qualification process by utilizing a material’s Trace to predict properties of composites using Excel programs and basis data. To test this theory, predicted properties from the program, QuickLam, were compared to experimental data. Unidirectional 0° (T1), unidirectional 90° (T2), quasi-isotropic (T3), and hard quasi-isotropic (T4) laminates were made using HexTowR carbon fiber and TC250 resin provided by TenCate Advanced Composites. Tensile and compression tests were done according to ASTM D3039 …

Orfalea College Of Business- Fire & Life Safety Analysis, Napoleon E. Nino

Fire Protection Engineering: Culminating Experience Project Reports

This report details the prescriptive and performance based analyses performed on the Orfalea College of Business building, located on the Cal Poly San Luis Obispo campus. Designed in accordance with the 1985 Uniform Building Code (UBC), this building is evaluated for compliance with the requirements prescribed under relevant codes in place as of 2016. The main function of this building is to serve both academic and administrative purposes, including classrooms and staff offices. Aspects of the building analyzed include: Egress Systems, Structural Fire Protection, Smoke Management, Fire Detection, Fire Notification, and Fire Suppression The prescriptive analysis demonstrates the lack of …

Lax Continental Grand- Fire Protection And Life Safety Analysis, Aden Malek Stepanians

Fire Protection Engineering: Culminating Experience Project Reports

A prescriptive analysis of the project building was conducted using the 2016 California Building & Fire Code along with current codes and standards pertaining to specific elements. Encompassed in this analysis is a review of the project building’s structural fire protection, water-based suppression systems, fire detection and alarm systems, smoke control and occupant egress.

Void of construction documentation, the analysis of the structural fire protection of the building was determined by evaluating the current design and use. The restricting factor that determine the construction type was the assembly use on the 6th floor. Other than Type I construction, assembly use …

Design For Waste Reduction And Efficiency Improvement For The Construction Usage Of The Tower Crane, George Merida, Roman Richard

Industrial and Manufacturing Engineering

Webcor Concrete Group’s on-site tower crane is currently experiencing unknown forms of inefficiency. The project team used the DMAIC methodology to implement Define, Measure, Analyze, Improve, and Control in order to guide and structure the project. After the project team formulated a problem statement, observations were collected of tower crane deliveries resulting in 470 individual data points. The data was then analyzed using basic statistics, histograms, and lean manufacturing tools in order to identify wastes and inefficiencies. Once the wastes and inefficiencies were identified, root cause analysis was performed. The identified root causes were then used as the basis for …

Designing An Information System To Efficiently Coordinate Film Screenings, Galen Dougherty

Industrial and Manufacturing Engineering

This paper explains the engineering concepts design efforts used to build an information system to efficiently coordinate film screenings. The market served is an emerging group of film makers and production companies that have limited resources. The application aims to save both time and money in coordination efforts for screening films in the local community. The project case examined is a small production start-up from Cal Poly San Luis Obispo named Yellow Glass Media. The design described in the paper specifically targets their needs which are assumed to be representative of the needs of the larger emerging market. The design …

Low-Cost Jetting System; Space And Naval Warfare Systems Command (Spawar), Carson B. Bush, Daly Sombat, Charles J. Kleeman

Mechanical Engineering

SPAWAR, a research and development side of the U.S. Navy, needed a way to bury classified payloads below the seafloor in order to anchor the devices. They currently use a jetting system that costs around $20,000 to do it, and they desired a cheaper system capable of performing the same tasks. SPAWAR presented the project to Cal Poly Mechanical Engineers as a senior project in the fall of 2016.

The design team that decided to take on the project was interested in creating the system with two key factors in mind in order to make the device less expensive.

1. …

Avalon Submersible Support Structure: Final Project Report, Alexandra Mililani Zaragoza, Octavio Mendoza, Austin Scott Eslinger

Mechanical Engineering

The MBMM, represented by our sponsor Bob McCay, is currently looking for a new way to support the Deep Submergence Rescue Vehicle (DSRV), Avalon, that they have on display. The DSRV is currently sitting on a Short Haul Vehicle (SHV) trailer and the total weight (32 tons) is currently being supported by the SHV’s tires. This is a source of concern for the MBMM due to the weathering the tires have undergone combined with the amount of time that they have been supporting the weight. The MBMM is looking for a support structure that will take the weight off of …

Cal Poly Supermileage Steering System, Lucas S. Rybarczyk, Sean K. Michel, Giovanni P. Murillo

Mechanical Engineering

The following report outlines the full design process that the senior project team went through to develop a steering system for the 2018 Cal Poly Supermileage vehicle from the development to the manufacturing and testing of the senior project steering system. The team was successful in reducing the weight of the steering system from 12.64 to 5.85 pounds while remaining within the cost budget provided for the Cal Poly Supermileage team. The new steering system initially failed drop testing which resulted in the uprights pulling out of the bottom carbon supports. This failure was repaired with a small redesign to …

Mini High Temperature Test Unit Final Design Report, Kevin Liu, Juan P. Castillo

Mechanical Engineering

Lawrence Livermore National Laboratory has invested considerable effort to develop new standard for nuclear grade HEPA filters that can withstand high temperatures along with methods to optimally test not only the experimental filter media, but also new frame seals and media binders. Therefore, LLNL in collaboration with Cal Poly has designed and built a Mini High Temperature Testing Unit (MHTTU) to recreate conditions observed during a fire and to test different materials in an effective, inexpensive, regulated and reliable method. The existing prototype was unable to achieve the ideal testing conditions of 1000°F air at the low flow rates of …

Marine Gastrobot Final Design Report, Wesley B. Williams, Eric Kane Dreischerf, Tommy Nicholas Yath

Mechanical Engineering

The Marine Gastrobot sponsored by Dr. Christopher Kitts of the Cal Poly Center for Applications in Biotechnology was a research and development effort intended to explore the use of microbial fuel cell technology as a power source for underwater robots. Our team Ocean Locomotion succeeded in developing a first iteration of an underwater robotic platform suitable for microbial fuel cell integration. The primary feature of the design is its sinusoidal fin propulsion intended for benthic exploration with limited risk of entanglement. During the course of development, Ocean Locomotion explored the use of low power actuation methods and determined their limited …

Water Fun At Exploration Station, Nicholas M. Runyan, Heriberto Rodriguez, Raymond F. Morales, Alejandro M. Gonzalez-Smith

Mechanical Engineering

This report documents the design and fabrication processes involved for the creation of an interactive science exhibit for the Grover Beach Exploration Station. This is a student-led senior project advised by Sarah Harding, professor of mechanical engineering, as a part of California Polytechnic State University in San Luis Obispo’s mechanical engineering program. The final product is a fully functioning, durable system that is capable of pumping and recycling water throughout use when users are in its vicinity.

The exhibit is to be considered in 4 main subsystems: basin, plumbing, frame, and sleep mode system. A fiberglass basin that holds all …

Grey Water Capture, Paul B. Brenneman, Vicente J. Ramirez, Kevin J. Alexander

Mechanical Engineering

Many households today do not implement any kind of grey water recycling system. People do not get a grey water system for a variety of reasons; the benefits could be unknown, the uses for grey water could be limited in their specific home, or the economic gain is too minimal to constitute a modification to the house.

For our project, we are going to design an easy to install product that enables the reuse of grey water from household sources. Examples of our final product could be something that lets the customer use grey water from the bathroom sink to …

Reliability Test Fixture For Flexible Hybrid Electronics, Julia Akiko Roche, Maya Francesca Zumel Manzano, Paul Alfred Swartz

Mechanical Engineering

During the 2016-2017 school year, the Cal Poly NextFlex Group, in conjuncture with the Cal Poly Industrial and Manufacturing Engineering Department, was comprised of professors, undergraduate students, and graduate students all working towards the manufacturing of flexible hybrid electronics (FHEs). FHEs, which are comprised of a flexible plastic substrate (thermoplastic polyurethane), screen-printed silver ink, and a thin silicon wafer, have a wide range of potential applications. At the time of this project, FHEs and other flexible electronics did not have a set of test standards to characterize their mechanical and electrical properties. The Cal Poly NextFlex Group recruited three Cal …

Vortexing Off A Common Suction Header, Ryan J. Caceres, Brett R. Langlois, Brian H. Greenberg

Mechanical Engineering

This project is the first iteration of a testing rig to determine the critical submergence of a vortex off a main suction header. The rig was designed with supplies purchased and provided by PG&E, including 4-6” schedule 40 PVC pipe and fittings, a large water tank, a pump, and a flowmeter. PG&E at Diablo Canyon Power Plant presented their problem to the Cal Poly Mechanical Engineering Senior Project class, and three mechanical engineers took up the project. The following report details the ideation, design, build, and test processes used during the 2016-17 academic year to create the vortex testing rig. …

Air Bubble Curtain Anchoring, Christian J. Young, Donavan Wesley Lawrence, Dakota Catherine Schwartz

Mechanical Engineering

To prevent salp (jellyfish) from entering Diablo Canyon Power Plant’s intake pipes, and ultimately having the plant shut down as a result, an air bubble curtain is anchored along the ocean floor for the duration of the salp swarm to create a barrier that prevents the salp and other debris from entering the intake. The curtain consists of four large air compressors connected to four parallel pipes with holes strategically drilled at various places along the length of the pipe. When the air compressors are turned on, a torrent of bubbles are shot out from the pipes which create a …

Polytechnic Students' Aspirations, Interests, And Confidence: Case Study On Students' Understanding Of And Reasoning For Major Selection, Matthew Turner, Rustin Webster, Christopher Mark Schroder, Joseph F. Dues Jr., Andrew Mccart

School of Engineering Technology Faculty Publications

This case study explores the conceptions held by first year polytechnic students at [Redacted] related to technology majors. Specifically, this research examines how technology students define Mechanical Engineering Technology, Electrical Engineering Technology, and Computer Graphics Technology majors, their confidence in their given definitions, and the future job titles they associate with technology majors. The data for the study was collected from survey responses of 34 polytechnic students in a fall 2016 gateway to technology course. Qualitative data (i.e. structured survey text) was analyzed using NVivo® to identify themes, trends and patterns in the students’ responses. Quantitative data (i.e. scaled responses) …

Industry Supplied Cad Curriculum And Team Project-Based Learning: Case Study On Developing Design, Problem-Solving, Communication, And Group Skills, Rustin Webster

School of Engineering Technology Faculty Publications

This case study investigates the extent to which industry supplied computer-aided design (CAD) curriculum and team project-based learning impacts undergraduate engineering technology students’ engineering design, problem-solving, communication, and group participation skills. Evidence for the study comes from nine mechanical and one electrical engineering technology students enrolled in an upper level design course. Instructional materials included a SOLIDWORKS supplied CAD guide and a team project. Part three of the Classroom Activities and Outcomes Survey measured the extent to which the students believed they had made progress in a variety of learning and skill development areas as a result of taking the …

System Usability Scale (Sus): Oculus Rift® Dk2 And Samsung Gear Vr®, Rustin Webster, Joseph F. Dues Jr.

School of Engineering Technology Faculty Publications

This study investigated the broad usability of two different virtual reality (VR) systems, independent of each other. This research is the beginning of a series of studies to be conducted assessing the usability of various low-cost commercially available VR platforms. Data gathered will be used by stakeholders and decision makers to aid in the purchasing of VR hardware for academic classroom use. The ultimate goal is to continue studying the interaction effect between routine classroom instructor-led teaching (i.e. lecture-based multimedia instruction) and immersive VR teaching (i.e. VR-based multimedia instruction) in terms of learning. The experimental study used a convenience sample …

Me-Em Enewsbrief, June 2017, Department Of Mechanical Engineering-Engineering Mechanics, Michigan Technological University

Department of Mechanical and Aerospace Engineering eNewsBrief

No abstract provided.