Mathematical Modeling Of A Two Wheeled Robotic Base, 2021 University of Arkansas, Fayetteville
Mathematical Modeling Of A Two Wheeled Robotic Base, Kathryn Remell
Mechanical Engineering Undergraduate Honors Theses
This thesis presents the concept of using a two wheeled robot on the moon and briefly explores the requirements for successful long term operation in a lunar environment. The mathematical model for the motion of a robot with two fixed wheels on a differential drive with in a global reference frame. The robot is assumed to be balancing a platform so the mathematical model to balance the platform with wheel motors is also developed and briefly evaluated.
Dynamic Characterization Of Duroprotect, A Fiber-Reinforced Ballistics Composite, 2020 University of Mississippi
Dynamic Characterization Of Duroprotect, A Fiber-Reinforced Ballistics Composite, Ivy A. Turner
Dynamic characterization of materials has become increasingly common, as it is important to understand how materials behave under sudden loads. Understanding these properties can aid in material selection for novel designs. DuroProtect, a fiber-reinforced ballistics composite developed by Rӧchling, was tested for its dynamic properties at high strain-rates. The Split Hopkinson Pressure Bar (SHPB) test was used to obtain dynamic properties at high strain-rates under compressive loading conditions. Tests were initially conducted to validate force equilibriums for each sample. The data measured from the strain gages mounted on the incident and transmission bars and the elastic wave propagation theories yields ...
Development And Test Of High Temperature Surface Acoustic Wave Gas Sensors, 2020 University of Maine
Development And Test Of High Temperature Surface Acoustic Wave Gas Sensors, Armando E. Ayes Moncada
Electronic Theses and Dissertations
The demand for sensors in hostile environments, such as power plant environments, exhaust systems and high-temperature metallurgy environments, has risen over the past decades in a continuous attempt to increase process control, improve energy and process efficiency in production, reduce operational and maintenance costs, increase safety, and perform condition-based maintenance in equipment and structures operating in high-temperature, harsh-environment conditions. The increased reliability, improved performance, and development of new sensors and networks with a multitude of components, especially wireless networks, are the target for operation in harsh environments. Gas sensors, in particular hydrogen gas sensors, operating above 200°C are required ...
Analog Versus Digital Guitar Pedals, Shaping Guitar Tones And Sparking Debates, 2020 California State University, Monterey Bay
Analog Versus Digital Guitar Pedals, Shaping Guitar Tones And Sparking Debates, Cameron Karren
Capstone Projects and Master's Theses
This paper goes into the history of guitar effects, what exactly they are, how they have evolved, and what they are like today. It also presents the results of an experiment that compares perceptions of differences between analog and digital guitar pedals.
Olivet Nazarene University Telescope Vibration, 2020 Olivet Nazarene University
Olivet Nazarene University Telescope Vibration, Jake Butterfield, Kamil Michorczyk, Nathan Eckerle
Scholar Week 2016 - present
Our project entails the use of vibration analysis to come up with a solution to the vibrational issues the ONU Telescope on top of Reed Hall of Science is currently experiencing. In its current state, the telescope produces images that are shaky and unclear; thus, rendering it useless for its intended research purposes. This shaky image is a result of excessive vibrations on and around the telescope. Within this project we diagnosed the source of the vibrations, brainstormed different design possibilities, chose the best one that is most feasible and meets the client’s needs, and proposed a detailed final ...
Adaptable Clean Energy Laboratory, 2020 Embry-Riddle Aeronautical University
Adaptable Clean Energy Laboratory, Joao Marcelo Rocha Belmonte, Marc D. Compere
The Adaptable Clean Energy (ACE) Lab is a real-world, long term, test platform that will guide the courses of the Energy Systems track. The lab will provide realistic electrical and HVAC loads that mimic a solar powered office. The lab is a 20’ high cube shipping container modified with a door, windows, lights computers, air conditioner and appliances. The lab is Net-Zero and powered entirely from the sun. Two insulation test sections expose the exterior walls for research access to real external heat loads in a real building
Multi-Objective Optimization Of Multi-Loop Control Systems, 2020 Marshall University
Multi-Objective Optimization Of Multi-Loop Control Systems, Yuekun Chen
Theses, Dissertations and Capstones
Cascade Control systems are composed of inner and outer control loops. Compared to the traditional single feedback controls, the structure of cascade controls is more complex. As a result, the implementation of these control methods is costly because extra sensors are needed to measure the inner process states. On the other side, cascade control algorithms can significantly improve the controlled system performance if they are designed properly. For instance, cascade control strategies can act faster than single feedback methods to prevent undesired disturbances, which can drive the controlled system’s output away from its target value, from spreading through the ...
Filtered-Dynamic-Inversion Control For Unknown Minimum-Phase Systems With Unknown Relative Degree, 2020 University of Kentucky
Filtered-Dynamic-Inversion Control For Unknown Minimum-Phase Systems With Unknown Relative Degree, Sumit Suryakant Kamat
Theses and Dissertations--Mechanical Engineering
We present filtered-dynamic-inversion (FDI) control for unknown linear time-invariant systems that are multi-input multi-output and minimum phase with unknown-but-bounded relative degree. This FDI controller requires limited model information, specifically, knowledge of an upper bound on the relative degree and knowledge of the first nonzero Markov parameter. The FDI controller is a single-parameter high-parameter-stabilizing controller that is robust to uncertainty in the relative degree. We characterize the stability of the closed-loop system. We present numerical examples, where the FDI controller is implemented in feedback with mathematical and physical systems. The numerical examples demonstrate that the FDI controller for unknown relative degree ...
Fast Decision-Making Under Time And Resource Constraints, 2020 West Virginia University
Fast Decision-Making Under Time And Resource Constraints, Kyle Gabriel Lassak
Graduate Theses, Dissertations, and Problem Reports
Practical decision makers are inherently limited by computational and memory resources as well as the time available in which to make decisions. To cope with these limitations, humans actively seek methods which limit their resource demands by exploiting structure within the environment and exploiting a coupling between their sensing and actuation to form heuristics for fast decision-making. To date, such behavior has not been replicated in artificial agents. This research explores how heuristics may be incorporated into the decision-making process to quickly make high-quality decisions through the analysis of a prominent case study: the outfielder problem. In the outfielder problem ...
Numerical And Experimental Studies Of Blocked Force Determination On An Offset Interface For Plate And Shell Structures And Duct Acoustic Systems, Keyu Chen
Theses and Dissertations--Mechanical Engineering
Blocked force determination is an alternative to the more routine method of inverse force determination using classical transfer path analysis. One advantage of determining blocked forces is that there is no need for the source to be detached or isolated from the system. Another advantage is that calculated blocked forces are appropriate when modifications are made on the receiver side of the interface. This insures that the blocked forces are suitable for utilization in analysis models where receiver system modifications are considered. Difficulties in using the approach arise when interface locations are difficult to instrument. This thesis demonstrates that blocked ...
Sensor-As-A-Service: Convergence Of Sensor Analytic Point Solutions (Snaps) And Pay-A-Penny-Per-Use (Pappu) Paradigm As A Catalyst For Democratization Of Healthcare In Underserved Communities, 2020 University of Florida
Sensor-As-A-Service: Convergence Of Sensor Analytic Point Solutions (Snaps) And Pay-A-Penny-Per-Use (Pappu) Paradigm As A Catalyst For Democratization Of Healthcare In Underserved Communities, Victoria Morgan, Lisseth Casso-Hartmann, David Bahamon-Pinzon, Kelli Mccourt, Robert G. Hjort, Sahar Bahramzadeh, Irene Velez-Torres, Eric Mclamore, Carmen Gomes, Evangelyn C. Alocilja, Nirajan Bhusal, Sunaina Shrestha, Nisha Pote, Ruben Kenny Briceno, Shoumen Palit Austin Datta, Diana C. Vanegas
Mechanical Engineering Publications
In this manuscript, we discuss relevant socioeconomic factors for developing and implementing sensor analytic point solutions (SNAPS) as point-of-care tools to serve impoverished communities. The distinct economic, environmental, cultural, and ethical paradigms that affect economically disadvantaged users add complexity to the process of technology development and deployment beyond the science and engineering issues. We begin by contextualizing the environmental burden of disease in select low-income regions around the world, including environmental hazards at work, home, and the broader community environment, where SNAPS may be helpful in the prevention and mitigation of human exposure to harmful biological vectors and chemical agents ...
Dynamic Testing: An Experimental Approach To Defect Identification In Additive Manufactured Parts, 2020 Michigan Technological University
Dynamic Testing: An Experimental Approach To Defect Identification In Additive Manufactured Parts, Aimee Allen
Dissertations, Master's Theses and Master's Reports
Today’s additive manufacturing (AM) industry produces specialized parts at low volume or with complex geometries. Traditional testing methods are effective, but costly and time consuming to perform. The AM industry lacks an optimized testing method for identifying internal defects that occur in parts. The evaluation of multiple parts printed on the same build plate for internal defects using various nondestructive (dynamic) testing techniques is presented. From these experiments, perspective was gained on when and how dynamic testing can be used to find defects. Insight gained from these experiments can help the industry in future testing for internal defects.
Development Of High-Speed Photoacoustic Imaging Technology And Its Applications In Biomedical Research, 2019 Washington University in St. Louis
Development Of High-Speed Photoacoustic Imaging Technology And Its Applications In Biomedical Research, Yun He
Engineering and Applied Science Theses & Dissertations
Photoacoustic (PA) tomography (PAT) is a novel imaging modality that combines the fine lateral resolution from optical imaging and the deep penetration from ultrasonic imaging, and provides rich optical-absorption–based images. PAT has been widely used in extracting structural and functional information from both ex vivo tissue samples to in vivo animals and humans with different length scales by imaging various endogenous and exogenous contrasts at the ultraviolet to infrared spectrum. For example, hemoglobin in red blood cells is of particular interest in PAT since it is one of the dominant absorbers in tissue at the visible wavelength.The main ...
A Wearable Mechatronic Device For Hand Tremor Monitoring And Suppression: Development And Evaluation, 2019 The University of Western Ontario
A Wearable Mechatronic Device For Hand Tremor Monitoring And Suppression: Development And Evaluation, Yue Zhou
Electronic Thesis and Dissertation Repository
Tremor, one of the most disabling symptoms of Parkinson's disease (PD), significantly affects the quality of life of the individuals who suffer from it. These people live with difficulties with fine motor tasks, such as eating and writing, and suffer from social embarrassment. Traditional medicines are often ineffective, and surgery is highly invasive and risky. The emergence of wearable technology facilitates an externally worn mechatronic tremor suppression device as a potential alternative approach for tremor management. However, no device has been developed for the suppression of finger tremor that has been validated on a human.
It has been reported ...
Dynamic Pressure Sensing For The Flight Test Data System, 2019 California Polytechnic State University - San Luis Obispo
Dynamic Pressure Sensing For The Flight Test Data System, Marc Y. Goupil
Master's Theses and Project Reports
This thesis describes the design, assembly, and test of the FTDS-K, a new device in the Boundary Layer Data System (BLDS) family of flight data acquisition systems. The FTDS-K provides high-frequency, high-gain data acquisition capability for up to two pressure sensors and an additional three low-frequency pressure sensors. Development of the FTDS-K was separated into a core module, specialized analog subsystem, and practical testing of the FTDS-K in a flow measurement mission. The core module combines an nRF52840-based microcontroller module, switching regulator, microSD card, real-time clock, temperature sensor, and trio of pressure sensors to provide the same capabilities as previous-generation ...
Predictive Simulation Of Human Movement And Applications To Assistive Device Design And Control, 2019 University of Massachusetts Amherst
Predictive Simulation Of Human Movement And Applications To Assistive Device Design And Control, Vinh Nguyen
Predictive simulation based on dynamic optimization using musculoskeletal models is a powerful approach for studying biomechanics of human gait. Predictive simulation can be used for a variety of applications from designing assistive devices to testing theories of motor controls. However, one of the challenges in formulating the predictive dynamic optimization problem is that the cost function, which represents the underlying goal of the walking task (e.g., minimal energy consumption) is generally unknown and is assumed a priori. While different studies used different cost functions, the qualities of the gaits with those cost functions were often not provided. Therefore, this ...
Design And Kinematic Analysis Of A Semi-Compliant Swashplate Mechanism, 2019 Kennesaw State University
Design And Kinematic Analysis Of A Semi-Compliant Swashplate Mechanism, Niko Giannakakos
Georgia Undergraduate Research Conference (GURC)
Compliant mechanisms generate motion through the deformation or deflection of its flexible members rather than the revolute joints utilized in traditional rigid link mechanisms. If a compliant mechanism is designed as a single piece without the need of joints to create relative motion, then it is a monolithic system. If at least one part of the mechanism is flexible and assembled with rigid parts and joints, then it is a partially compliant mechanism. The superiorities of compliant mechanisms over rigid mechanisms are the reduced number of parts required to build the system, simple design, no backlash, no lubrication, less friction ...
Design Of A Monolithic Compliant Swimming Robot, 2019 Kennesaw State University
Design Of A Monolithic Compliant Swimming Robot, Joshua Hooper, Andy Houghton
Georgia Undergraduate Research Conference (GURC)
Compliant mechanisms use the flexibility of their members to transfer an input displacement, force or torque to another point on the mechanism through the large deformation of its flexible links or joints. Fewer number of links, no friction, no backlash and simple design are the most important features that make them an ideal candidate when light weight, low cost and high performance are desired. The only challenge while designing a compliant mechanism is deriving the equations of motion as flexible links or flexure hinges go under large deformation.
We designed a monolithic compliant swimming robot consists of a dc motor ...
Calculation Of Scalar Isosurface Area And Applications, 2019 University of Massachusetts Amherst
Calculation Of Scalar Isosurface Area And Applications, Kedar Prashant Shete
The problem of calculating iso-surface statistics in turbulent flows is interesting for a number of reasons, some of them being combustion modeling, entrainment through turbulent/non-turbulent interfaces, calculating mass flux through iso-scalar surfaces and mapping of scalar fields. A fundamental effect of fuid turbulence is to wrinkle scalar iso-surfaces. A review of the literature shows that iso-surface calculations have primarily been done with geometric methods, which have challenges when used to calculate surfaces that have high complexity, such as in turbulent flows. In this thesis, we propose an alternative integral method and test it against analytical solutions. We present a ...
Airborne Topological Acoustics, 2019 The University of Western Ontario
Airborne Topological Acoustics, Xingxing Liu
Electronic Thesis and Dissertation Repository
Advances in topological acoustics are leading to potential development for noise attenuation, ultrasonic imaging, sound manipulation, and information delivering, etc. Recently, ideas and methodologies from condensed-matter physics, such as the quantum Hall effect (QHE), the quantum spin Hall effect (QSHE), and the quantum valley Hall effect (QVHE), combined with configurations of sonic crystals and metamaterials, have been investigated in manipulating acoustic transmissions in the form of one-way edge modes and defect-immune protected acoustics. However, many related studies are still in their infancy and mostly rely on bulky, noisy, overly complicated, untunable and narrow-band-effective facilities, and so it is highly desirable ...