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- Link Foundation Ocean Engineering and Instrumentation Fellowship Reports (22)
- Link Foundation Modeling, Simulation and Training Fellowship Reports (9)
- Mechanical and Civil Engineering Faculty Publications (6)
- Link Foundation Energy Fellowship Reports (4)
- Ocean Engineering and Marine Sciences Faculty Publications (4)
Articles 1 - 30 of 46
Full-Text Articles in Engineering
Garbage Float, Gabor Papp, Max Woolverton, Scott Ulatowski, Daniel Ross, Nicholas Gayle, Bryan Merchan-Aragon, Noah Yco, Nicholas Fawcett, Jared Wright, Abdulaziz Salman G Alshahrani, Andrew Mcquire
Garbage Float, Gabor Papp, Max Woolverton, Scott Ulatowski, Daniel Ross, Nicholas Gayle, Bryan Merchan-Aragon, Noah Yco, Nicholas Fawcett, Jared Wright, Abdulaziz Salman G Alshahrani, Andrew Mcquire
Mechanical and Civil Engineering Student Publications
Trash pileup in our waters is an increasing problem. Removing floating plastics and debris from our ecosystem would reduce mortality rate of marine animals. Solutions for this already exist but most of them are proprietary and expensive. Therefore, an autonomous, publicly available and cheap alternative was developed to skim and clean the water surface from garbage.
Design And Simulation Of Intelligent Control Algorithms For Bimanual Robot-Assisted Retinal Surgery Training System, Ali Ebrahimi
Design And Simulation Of Intelligent Control Algorithms For Bimanual Robot-Assisted Retinal Surgery Training System, Ali Ebrahimi
Link Foundation Modeling, Simulation and Training Fellowship Reports
Vitreoretinal surgery is among the most delicate surgical tasks in which physiological hand tremor may severely diminish surgeon performance and put the eye at high risk of injury. Unerring targeting accuracy is required to perform precise operations on micro-scale tissues of the eye. The objective of this project is to develop robotic platforms and intelligent control algorithms to provide a safe bilateral steady-hand eye manipulation for surgeons, which can potentially lead to autonomous surgical procedures. This will in tum enhance patient safety and surgical outcome which can be very beneficial to both patients and surgeons.
Evaluating Mixed Reality Training For Calibrating Operators’ Mental Models Of Advanced Driver Assistance Systems, Ganesh Pai Mangalore
Evaluating Mixed Reality Training For Calibrating Operators’ Mental Models Of Advanced Driver Assistance Systems, Ganesh Pai Mangalore
Link Foundation Modeling, Simulation and Training Fellowship Reports
Advanced Driver Assistance Systems (ADAS) offer safety benefits by handling active driving tasks. However, due to limited operational design domain, these systems may require driver intervention, making drivers’ mental models about system limitations and capabilities an important factor when operating them. Literature suggests most drivers are uninformed or unaware of their systems (McDonald et al, 2018), lacking complete or accurate mental models. Mental models (MM) are described as reflections of operators’ knowledge of system’s purpose and various functioning states (Seppelt & Victor, 2020). Incomplete MM of systems’ limitations may also adversely affect drivers’ hazard avoidance behavior.
Human-Automation Interaction Testbed For Evaluating User Control Methods And Training, Sarah M. O'Meara
Human-Automation Interaction Testbed For Evaluating User Control Methods And Training, Sarah M. O'Meara
Link Foundation Modeling, Simulation and Training Fellowship Reports
In a complex work environment, an operational challenge may be controlling the multitude of independent objects that are required for a manual task and/or object manipulation, such as experienced by astronauts, surgeons, underwater operations, manufacturing etc. One possible option is the enhancement of the person’s capabilities through a robotic supernumerary limb (Figure 1). The idea has already been implemented in a limited application, where the United States Army Research Laboratory developed a passive limb to aid soldiers in weapon carrying and stabilization[1]. Researchers are also creating supernumerary robots. Parietti, et al. [2] designed the Supernumerary Robotics Limbs to address aircraft …
Sensor Development To Utilize Underwater Electric Potential (Uep) Fields To Navigate The Underwater Areas Of Ship Hulls, Caglar Erdogan
Sensor Development To Utilize Underwater Electric Potential (Uep) Fields To Navigate The Underwater Areas Of Ship Hulls, Caglar Erdogan
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Underwater electric potential fields occur due to natural reasons, such as changes in atmosphere, ionosphere, magnetosphere, and movements of water bodies in the ocean, or artificial reasons, such as stray and controlled electric currents, or both. Electric potential fields around ship hulls are mainly generated due to corrosion protection systems and dissimilar materials. The electric field intensity over an impressed current anode of a large cruise ship operating in with seawater with a resistance of 20 0-cm is around 90 mV/cm, whereas it is between 0.4 and 1 mV/cm on a propeller for the same ship. The theoretical field intensities …
Developing In Situ Dissolved Inorganic Carbon Dioxide Instrumentation, Beckett Colson
Developing In Situ Dissolved Inorganic Carbon Dioxide Instrumentation, Beckett Colson
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
The ocean carbon system plays a critical role in regulating carbon dioxide content in the atmosphere. With increased anthropogenic carbon input, it is even more important to understand the system through measurements, models, and predictions. Unfortunately, the spatiotemporal resolution of ocean carbon system measurements is limited by a lack of in situ instrumentation. The support of the Link Foundation Ocean Engineering and Instrumentation Fellowship has enabled me to make significant progress in developing an in situ carbon system instrument for the deep sea. The instrument will measure both total dissolved inorganic carbon (DIC) and the partial pressure of carbon dioxide …
Surf Zone Tilt Current Meter, Troy Heitmann
Surf Zone Tilt Current Meter, Troy Heitmann
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Coastal tides and free surface gravity waves locally interact with the nearshore bathymetry generating spatially diverse circulation cells. Collectively, the cells form a current velocity flow field where net transport of geological, chemical, or biological, particulates takes place. Within the surf zone, dynamic instabilities lead to chaotic evolution and mixing, where single point, observations fail to quantitatively characterize the system as a whole. Governed by advanced theories, numerical models provide the necessary sampling resolution to study surf zone processes over large domains, but the model must be validated with field observations to draw meaningful conclusions. The acoustic Doppler current profiler …
Link Foundation Fellowship Report, Eric Nieves
Link Foundation Fellowship Report, Eric Nieves
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Magnetic anomaly detection (MAD) is a leading technique for the detection and localization of obscured magnetic targets via exploiting the field anomalies they create. This is especially true in marine environments when looking for unexploded ordnance (UXO), because the DC magnetic field is not highly influenced by numerous types of media (i.e. water) or weather conditions. MAD is also a passive technique, which allows it to go unnoticed by the target. Whereas current applications of MAD have been shown to be effective for localizing single targets at a time, the development of a method for multiple localization would the robustness …
The Development Of A Novel Motion Cuing Algorithm For Flight Training Simulators Employing Objective Metrics For Evaluation, Ahmad Qasim Momani
The Development Of A Novel Motion Cuing Algorithm For Flight Training Simulators Employing Objective Metrics For Evaluation, Ahmad Qasim Momani
Link Foundation Modeling, Simulation and Training Fellowship Reports
The value of a dynamic motion platform to the flight simulator is a controversial issue within the flight training community. The motion of the flight simulator platform has been shown to affect pilot performance and behavior. Moreover, its ability to provide the operator with the appropriate motion cues is essential for pilot training or research. Unwanted cues can cause the operator to develop inappropriate control behavior strategies that are not useful or might be dangerous in real flight. Performance studies show that the operator’s performance is enhanced when introducing motion which might indicate that the operator experiences a sensation closer …
Comparative Analysis Of Designing Solar And Geothermal Power Plants: A Case Study, Roberto Venegas, Sarada Kuravi, Krishna Kota, Mary Helen Mccay
Comparative Analysis Of Designing Solar And Geothermal Power Plants: A Case Study, Roberto Venegas, Sarada Kuravi, Krishna Kota, Mary Helen Mccay
Mechanical and Civil Engineering Faculty Publications
Geothermal and solar thermal are renewable, clean energy sources with immense potential for electricity generation. Concentrating Solar Power can achieve very high temperatures and high efficiencies compared to geothermal power plants. However, it is intermittent and must be coupled with thermal storage or another source for continuous power generation. Geothermal resources exist in varying temperatures but are too small for economic power production; however, it is not intermittent. This paper briefly summarizes the location-specific design considerations for geothermal and solar thermal plants. The performance of both these types of power plants is analysed in terms of capacity factor, thermal energy …
Development Of Product Recyclability Index Utilizing Design For Assembly And Disassembly Principles, Darshan P. Yadav, Deep N. Patel, Beshoy W. Morkos
Development Of Product Recyclability Index Utilizing Design For Assembly And Disassembly Principles, Darshan P. Yadav, Deep N. Patel, Beshoy W. Morkos
Mechanical and Civil Engineering Faculty Publications
Designing products for recyclability is driven by environmental and economic goals. Several design for assembly (DFA) rules and parameters can be used to gauge the recyclability index of product designs. These indices can be used for comparative analysis of the recyclability of different products. This assists the designer in making design choices related to the product's end of life. However, many of the existing recyclability indices are only available after design and manufacturing decisions are made. If such design decisions could be made earlier in the design process, when the design space is less bound, recyclability could be considered earlier. …
Flow Energy Harvesting Based On Oscillating Passively-Deforming Airfoils, Firas F. Siala
Flow Energy Harvesting Based On Oscillating Passively-Deforming Airfoils, Firas F. Siala
Link Foundation Energy Fellowship Reports
The rising global trend to reduce dependence on fossil fuels has provided significant motivation toward the development of alternative energy conversion methods and new technologies to improve their efficiency. Recently, the idea of using oscillating airfoils has been gaining a wider scope of attention as a means of extracting kinetic energy from streams, rivers, tidal flows and wind (Xiao & Zhu 2014). A large contribution to the existing knowledge has come through the studies of animal flight and swimming (Drucker & Lauder 1999; Triantafyllou et al. 2000; Sane 2003; Ho et al. 2003), where the oscillatory/flapping motion of wings or …
Evaluating Augmented Reality For Space Telerobotics Training, John Karasinski
Evaluating Augmented Reality For Space Telerobotics Training, John Karasinski
Link Foundation Modeling, Simulation and Training Fellowship Reports
Despite the extensive previous research into manual tracking, to the author’s knowledge there exists no study in the literature addressing human performance or workload changes in manual tracking tasks between traditional computer monitors and mobile, augmented reality headsets. The aim of this study was to investigate the effect of several factors on human performance and workload in a three-axis manual tracking task. Recent advances in computing hardware have enabled a new generation of augmented reality stereoscopic devices, such as the Microsoft HoloLens, which have yet to be evaluated in the literature. The Microsoft HoloLens provides depth cues to the user …
Nonlinear Ocean Energy Harvester, Dane Sequeira
Nonlinear Ocean Energy Harvester, Dane Sequeira
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
The scientific community has worked to extend communication networks, human safety programs, and environmental monitoring systems across continents, but has struggled to accomplish these same goals beyond the shoreline. Lack of offshore power is the greatest barrier restricting us from exploring the ocean because it is difficult to operate sensors without a reliable power source. Wave energy harvesting has been investigated as a solution; however, current methods have many shortcomings. Traditional ocean energy harvesters (e.g. buoys) extract energy from ocean waves by capturing the change in potential energy as the buoy travels vertically along the wave. A linear design, this …
Skin Deformation Feedback For Force Sensory Substitution In Teleoperation And Virtual Reality Training, Samuel Schorr
Skin Deformation Feedback For Force Sensory Substitution In Teleoperation And Virtual Reality Training, Samuel Schorr
Link Foundation Modeling, Simulation and Training Fellowship Reports
For this work, we developed a wearable skin deformation device that is worn on the tip of the finger. The devices have two separate components, the first of which is a finger grounding interface that straps to the medial phalanx. The interface holds a magnetic tracking sensor from an Ascension 3D Guidance trakSTAR system, which provides tracking information about the position and orientation of the fingers in free space at 200 Hz.
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Mechanical and Civil Engineering Faculty Publications
Because of the small size of nanomechanical systems, their vibrations become nonlinear already for small amplitudes. Many nontrivial aspects of the vibration dynamics arise from the coexistence of several nonlinearly coupled modes. We show that such coupling can lead to anomalous decay of the modes where they go through nonlinear resonance, so that their amplitude-dependent frequencies become commensurate. We demonstrate the possibility of a strongly nonmonotonic dependence of the decay rate on the amplitude if one of the modes serves as a thermal reservoir for another mode. Where the decay of both modes is slow compared to the rate of …
A Measuring System For Simultaneous Current, Wave And Ice Action On Offshore Structures, Yuxi Zhang
A Measuring System For Simultaneous Current, Wave And Ice Action On Offshore Structures, Yuxi Zhang
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
The design, fabrication and installation of a n Ice Force Measuring System (IFMS) were completed with partial support from the Department of Energy sponsored project entitled Measurement and Analysis of Extreme Wave and Ice Actions in the Great Lakes for Offshore Wind Platform Design in the fall of 2013 for ope rations during the winter of 2013 2014. The instrumentation was deployed in Lake Superior on a Keweenaw Peninsula lighthouse, where a large scale laboratory for cold regions engineering experimentation is naturally formed. A data acquisition system capture d readings from strain gauges encased in the IFMS plate and ice …
Interactive Training Of Teleoperated Robotic System For Real-Time Mriguided Steerable Needle Intervention, Gang Li
Link Foundation Modeling, Simulation and Training Fellowship Reports
Needle-based interventions, also known as percutaneous interventions, are common approaches for diagnostic and therapeutic procedures including tissue biopsy, delivery of therapeutic agents and tumor ablation. Needle steering, controlling the rotation of needle while inserting, is a clinical technique to produce a curved path to avoid anatomical obstacles (e.g. vasculature and bones) or compensate for placement errors. But, it requires delicate skills and long-term training to accurately steer the needle, due to difficult control of the needle path and lack of intraoperative image feedback. The objective of the proposed project is to develop a clinician-controlled teleoperated robotic system to train and …
Numerical Simulation Of Tip Clearance Impact On A Pumpjet Propulsor, Lin Lu, Guang Pan, Jing Wei, Yipeng Pan
Numerical Simulation Of Tip Clearance Impact On A Pumpjet Propulsor, Lin Lu, Guang Pan, Jing Wei, Yipeng Pan
Ocean Engineering and Marine Sciences Faculty Publications
Numerical simulation based on the Reynolds Averaged NaviereStokes (RANS) Computational Fluid Dynamics (CFD) method had been carried out with the commercial code ANSYS CFX. The structured grid and SST keu turbulence model had been adopted. The impact of noncondensable gas (NCG) on cavitation performance had been introduced into the Schnerr and Sauer cavitation model. The numerical investigation of cavitating flow of marine propeller E779A was carried out with different advance ratios and cavitation numbers to verify the numerical simulation method. Tip clearance effects on the performance of pumpjet propulsor had been investigated. Results showed that the structure and characteristics of …
Impacts Of Bias Correction Of Wind Forecasts On Hydrodynamic And Wave Model Predictions, Robert J. Weaver, Peyman Taeb, Bryan P. Holman, Steven M. Lazarus, Michael E. Splitt, Atousa Saberi, Jeff Colvin
Impacts Of Bias Correction Of Wind Forecasts On Hydrodynamic And Wave Model Predictions, Robert J. Weaver, Peyman Taeb, Bryan P. Holman, Steven M. Lazarus, Michael E. Splitt, Atousa Saberi, Jeff Colvin
Ocean Engineering and Marine Sciences Faculty Publications
High-resolution hydrodynamic models are forced by surface wind output from operational met. models. Current suite of operational met. models do not have the spatial resolution needed to resolve the fine scale processes associated with complex estuarine wind-driven circulation nor a detailed land-water mask. Goal: improve forecast wind forcing in most efficient manner as possible
Cfd Prediction And Simulation Of A Pumpjet Propulsor, Lin Lu, Guang Pan, Prasanta K. Sahoo
Cfd Prediction And Simulation Of A Pumpjet Propulsor, Lin Lu, Guang Pan, Prasanta K. Sahoo
Ocean Engineering and Marine Sciences Faculty Publications
In this study an attempt has been made to study the hydrodynamic performance of pumpjet propulsor. Numerical investigation based on the Reynolds Averaged NaviereStokes (RANS) computational fluid dynamics (CFD) method has been carried out. The structured grid and SST keu turbulence model have been applied. The numerical simulations of open water performance of marine propeller E779A are carried out with different advance ratios to verify the numerical simulation method. Results show that the thrust and the torque are in good agreements with experimental data. The grid independent inspection is applied to verify accuracy of numerical simulation grid. The numerical predictions …
Optimal Configuration And Tuning Of Wave Energy Converter Arrays, Emma Edwards
Optimal Configuration And Tuning Of Wave Energy Converter Arrays, Emma Edwards
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Power from ocean waves is becoming an increasingly attractive option as a source of renewable energy. Ocean waves are more reliable and predictable than sun and wind, and have a higher energy density [1]. There are locations where solar and wind energy would not be viable, due to the large amount of space they take up, either on land (solar) or above ground (wind). In addition, wave energy devices are less of a visual deterrent than wind turbines, and wave energy is particularly attractive for areas with a lot of coast line. Wave energy is still in its infancy, though, …
A Shipboard Instrument For Underway Estimates Of Marine N2 Fixation, Weiyi Tang
A Shipboard Instrument For Underway Estimates Of Marine N2 Fixation, Weiyi Tang
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Marine N2 fixation converts nitrogen gas into ammonia and accounts for the largest external nitrogen input to the oceans1. Since large portions of the global oceans are nitrogen deficient, marine N2 fixation can relieve the nitrogen limitation, thereby increasing the growth of phytoplankton and stimulating biological uptake of atmospheric carbon dioxide2,3,4. However, the magnitude and distribution of marine N2 fixation are poorly constrained5. In addition, the environmental controls on marine N2 fixation remain elusive6. This situation is in part attributable to the limited number of observations and poor coverage of marine N2 fixation measurements. Current observations rely on discrete sampling …
The Rapidly Reconfigurable Research Cockpit, Richard Joyce
The Rapidly Reconfigurable Research Cockpit, Richard Joyce
Link Foundation Modeling, Simulation and Training Fellowship Reports
The goal of the Rapidly Reconfigurable Research Cockpit (R3C) project is to create and evaluate a novel approach for aviation simulators. Our concept combines a virtual reality visual environment with the tactile feedback typically found in early stage mockups. A low cost, easily modified, yet geometrically accurate cockpit panel (fabricated using 3D printing, for example) can be used while the pilot/operator wears a head-mounted display providing the visual overlay of the simulator.
Intelligent Supervisory Switching Control Of An Unmanned Surface Vehicle, Ivan Rodrigues Bertaska
Intelligent Supervisory Switching Control Of An Unmanned Surface Vehicle, Ivan Rodrigues Bertaska
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
The project originally proposed for this fellowship focused on developing a framework for multimodal control of an unmanned surface vehicle (USV) – transitioning it from an underactuated system to an overactuated one. This would assist in two main functions USVs are typically tasked with: transiting and station-keeping. This project has since expanded to encompass novel territory in control theory, robotics, and computer science. The author is hopeful that the work reported here will assist in the transition of USVs from an academic pursuit into a valuable, pervasive tool for the oceanic sciences and the ocean industry. For the continued expansion …
A Novel In Situ Microscope For Studying Benthic Organisms, Andrew Mullen
A Novel In Situ Microscope For Studying Benthic Organisms, Andrew Mullen
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Coastal marine ecosystems such as coral reefs, kelp forests, sea grass beds and mangroves have significant societal value. As economic resources they support tourism, fisheries and storm protection while ecologically they host high biological diversity and productivity. Many basic biological, chemical, and physical processes taking place in these marine ecosystems occur at ‘micro-‐scales’ less than a millimeter in size. Examples of significant micro-‐scale activities include: coral bleaching of their single-‐ celled symbiotic algae, larval settlement and attachment, competition between sessile organisms along thin interfaces, and fluxes of particles to and from the seafloor. It is also important to consider that …
Bio-Inspired Flow Sensing For Underwater Guidance And Navigation, Levi Devries
Bio-Inspired Flow Sensing For Underwater Guidance And Navigation, Levi Devries
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Stream-dwelling fish and aquatic mammals have an innate ability to navigate often-tumultuous environments with impressive precision, a highly desirable trait for underwater vehicle applications. For example, trout use their lateral line to sense vortices shed by an upstream obstacle and slalom between the vortices to reduce energy expenditure compared to free-stream swimming [3]. Moreover, harbor seals can use their whiskers to follow the trail of flow disturbances created in the wake of an object that has passed minutes before [4]. Recent developments in materials science have produced sensors that can measure local flow velocity similar to seal whiskers, and integration …
Aerodynamics Of Biplane Wind Turbine Blades, Phillip K. Chiu
Aerodynamics Of Biplane Wind Turbine Blades, Phillip K. Chiu
Link Foundation Energy Fellowship Reports
Little is known about the aerodynamics of biplane wind turbine blades. Even more fundamentally, the two-dimensional aerodynamics of thick biplane airfoils are not well-understood. Supported by the Link Foundation Energy Fellowship, this research has sought to develop a better understanding of these aerodynamics through wind tunnel experiments and computational fluid dynamics. An understanding of biplane aerodynamics is a key step towards the commercial implementation of biplane wind turbine blades. These designs could enable larger turbines designs, ultimately reducing the cost of wind-generated electricity and helping to displace conventional means of electricity generation.
Predicting Underwater Radiated Noise From Offshore Impact Pile Driving, Huikwan Kim
Predicting Underwater Radiated Noise From Offshore Impact Pile Driving, Huikwan Kim
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Offshore wind turbines have been installed throughout Europe and are expected to be built in the United States water shortly. Offshore wind is an attractive option because 53% of the nation’s population lives in coastal area where energy cost and demands are high. Offshore winds tend to blow harder and more uniformly than on land [1]. However, structure borne noise and vibration generated by offshore impact pile driving radiate into and propagate through the air, water, and sediment media. The objective of this project is quantitatively predicting noise level around the piling location at sea to estimate the effects of …
Model Based Adaptive Control Of Underwater Vehicles For Improved Ocean Science, Christopher J. Mcfarland
Model Based Adaptive Control Of Underwater Vehicles For Improved Ocean Science, Christopher J. Mcfarland
Link Foundation Ocean Engineering and Instrumentation Fellowship Reports
Recent advances in unmanned underwater vehicle (UUV) capabilities have enabled oceanographic scientists to consider addressing research topics previously thought impractical or impossible. One such topic is the validation of high resolution computer models; long term deployments of coordinated UUV survey teams have been proposed to collect the density of measurements required. Another topic is the study of biological diversity in volatile areas; UUV intervention/sampling deployments have been proposed because of the inherent risks. In general, providing a high density of high accuracy measurements requires passing many targets as quickly and closely as possible. Similarly, efficacy for intervention/sampling deployments requires agile …