Identifying High-Collision Potential Vessel-Bridge Pairs In Vessel Traffic Service,
2020
Division of Navigation Science, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-Gu, Busan, Republic of Korea
Identifying High-Collision Potential Vessel-Bridge Pairs In Vessel Traffic Service, Jeong-Bin Yim, Chun-Ki Lee
Journal of Marine Science and Technology–Taiwan
Collision risk assessment for maritime traffic monitoring in vessel traffic service (VTS) is a key technology for ensuring the safety of both vessels and bridges. This study proposes a risk assessment methodology using a single measure of collision risk ratio that could assist in reducing the cognitive load of VTS operators. To explain the proposed method, we first define the semantic and mathematical relationship of vessel– bridge pier collisions; then, we establish the risk assessment framework using the collision risk ratio by combining deviation angle and stopping distance probabilities. To validate the proposed method, we conducted an experiment in the …
Experimental And Numerical Investigations On The Hydrodynamic Characteristics Of The Planar Motion Of An Open-Frame Remotely Operated Vehicle,
2020
College of Shipbuilding Engineering, Harbin Engineering University, Harbin, China
Experimental And Numerical Investigations On The Hydrodynamic Characteristics Of The Planar Motion Of An Open-Frame Remotely Operated Vehicle, Ying-Fei Zan, Rui-Nan Guo, Li-Hao Yuan, Shi-Peng Wang, Da-Zhong Zhang, Shi-Jing Xu, Zhao-Hui Wu
Journal of Marine Science and Technology–Taiwan
In this study, the longitudinal, sideways, vertical, and sideslip motions of an open-frame remotely operated vehicle (ROV) were experimentally and numerically investigated. The open-frame ROV was designed to be asymmetric in both the longitudinal and vertical directions to achieve special functionalities. A physical ROV model was tested in a towing tank with different velocities and sideslip angles in the horizontal and vertical planes. A numerical simulation was conducted with the same working conditions used in the scaled model tests by using a segregated flow solver based on Reynolds-averaged Navier–Stokes equations. This study investigated the effect of the hydrodynamic forces (moments) …
An Enhanced Sliding Mode Control Method For Wave Compensation System Of Ship-Mounted Cranes With Roll Motions And Parametric Uncertainties,
2020
College of Logistics Engineering, Shanghai Maritime University, Shanghai, China
An Enhanced Sliding Mode Control Method For Wave Compensation System Of Ship-Mounted Cranes With Roll Motions And Parametric Uncertainties, Hai-Yan Qiang, Si Xie, Zhi-Qiang Xu, You-Gang Sun
Journal of Marine Science and Technology–Taiwan
Ship-mounted cranes are widely used in offshore constructions, resource exploitation and marine salvages, to transfer payloads. Due to serious sea conditions, unexpected motions of the ships caused by the wave will probably pose serious efficiency and security issues. Thus, the wave compensation system has become necessary equipment for the shipmounted crane. But wave-induced motions of the ship, parametric uncertainties and nonlinearities remain challenges for control of wave compensation systems, which needs to be solved urgently. In this paper, the mathematical model of the wave compensation system is established firstly. Then, a sliding mode controller is presented and the stability is …
Study On Underwater Navigation For Underwater Track Vehicle,
2020
Marine Security and Safety Research Center, Korea Institute of Ocean Science & Technology, Busan, Korea
Study On Underwater Navigation For Underwater Track Vehicle, Dae-Hyeong Ji, Hyeung-Sik Choi, Sang-Ki Jeong, Hyun-Joon Cho, Ji-Hyeong Lee, Wen-Hsiang Hsieh
Journal of Marine Science and Technology–Taiwan
In this study, an underwater navigation algorithm was developed to apply a navigation system to an underwater track vehicle (UTV). Generally, a Doppler velocity log (DVL) is used to obtain the velocity information of underwater vehicles. However, a DVL cannot be used in a UTV owing to vehicle vibration and limited sensing distance. Hence, dead reckoning navigation is typically used, which results in severe errors in altitude and position values over long periods of operation. To address these problems, in this study, we developed a new underwater navigation system for a UTV using navigation sensors comprising an inertial navigation system, …
A Study On The Analysis Of Minimum Speed Control Effect Using Queue Model Focused On Busan Port,
2020
Shipping and Logistics Research Division, Korea Maritime Institute, Busan, South Korea
A Study On The Analysis Of Minimum Speed Control Effect Using Queue Model Focused On Busan Port, Sangwon Park, Won-Sik Kang, Young-Soo Park
Journal of Marine Science and Technology–Taiwan
VTS aims to increase the efficiency of maritime traffic in two ways. The first is a decrease in marine accidents, and the second is an increase in the utilization rate of infrastructure such as waterways and port facilities. This means that, if safety is guaranteed, efficiency must also be considered in the VTS. The purpose of this study is to quantitatively analyze the effects of speed regulation under safe conditions for an efficient use of waterways. A model was developed using a queue approach, and the effect of the waiting time according to the minimum speed proposal was analyzed through …
Vision Based Target Recognition For Cage Aquaculture Detection,
2020
Department of Communications, Navigation and Control Engineering, National Taiwan Ocean University, Keelung, Taiwan.
Vision Based Target Recognition For Cage Aquaculture Detection, Chao-Xun Chen, Jih-Gau Juang
Journal of Marine Science and Technology–Taiwan
This study applies Unmanned Aerial Vehicle (UAV) to netcage fish-farming. The UAV can fly thru cages along a predefined route. At each cage, the UAV can automatically drop sensors to collect the environment data around the cage. However, low cost commercial or assembled drone might not have precise Global Navigation Satellite System (GNSS). Also, there are many uncertain factors cause Global Positional System (GPS) instability, like weather, location…etc. The main idea of this study is using GPS to guide the drone to approximated location of each cage. Then, apply image recognition to obtain the net-cage and UAV relative position. After …
Dynamic Behavior Of A Long-Span Cable-Stayed Bridge With Floating Towers After The Sudden Failure Of Tethers And Cables Under Irregular Waves,
2020
School of Civil, Environmental, and Architectural Engineering, Korea University, Seoul, Korea
Dynamic Behavior Of A Long-Span Cable-Stayed Bridge With Floating Towers After The Sudden Failure Of Tethers And Cables Under Irregular Waves, Minseo Jang, Yunwoo Lee, Seungjun Kim, Young-Jong Kang
Journal of Marine Science and Technology–Taiwan
Cable-supported bridges with floating towers do not require fixed piers at the seabed. Therefore, innovative conceptual models have been continuously developed to overcome the limitations of conventional bridges in deep waters. The main floating tower that supports superstructures using stay cables is balanced by the buoyancy of floaters moored by tethers. The applicability of floating bridges should be verified by evaluating the overall stability considering the tether design. Here, various cases of the sudden failure of tethers and stay cables under the environmental conditions of a 100-year return period are simulated in a time-domain. The floating cable-stayed bridges are subjected …
Internal Force Evaluation Of A Submerged Floating Pipeline Under Irregular Waves,
2020
Coastal & Ocean Engineering Division, Korea Institute of Ocean Science and Technology, Busan, Korea
Internal Force Evaluation Of A Submerged Floating Pipeline Under Irregular Waves, Deokhee Won, Jihye Seo, Jong Sup Park, Seungjun Kim
Journal of Marine Science and Technology–Taiwan
Generally, submarine pipelines are laid on the seabed to transport water, oil, natural gas, and electricity to the land using submarine cables. However, they are not suitable for all seafloor conditions. There are environmental concerns such as deep seas, irregular seabed features, soft soils, transported materials and so on. To overcome these challenges, a submerged floating pipeline (SFP) concept was proposed. To stay in the middle of the water, the SFP has buoyant modules as floating devices. It is unrestricted under environments such as uneven seabeds, and deep waters, and is suspended to avoid interrupting passing vessels. This SFP model …
Design And Control Techniques Of The Open-Circuit Subsonic Wind Tunnel With Closed Testing Section,
2020
Turin Polytechnic University in Tashkent
Design And Control Techniques Of The Open-Circuit Subsonic Wind Tunnel With Closed Testing Section, Jamshid Yakhshilikov, Jamshid Inoyatkhodjaev
Acta of Turin Polytechnic University in Tashkent
This paper will describe the design and control techniques of the open-circuit subsonic wind tunnel with closed testing section (WT) for study purpose. The goal is to design a WT that can be tested at a wind speed of 30 m/s, where the desired cross-sectional area of the test chamber is 0.5x0.5 m. The pressure drop inside the WT has been calculated in order to select one of the available axial fans from the manufacturer’s catalog, and computational fluid dynamics (CFD) was performed to check the result. In order to obtain a smooth airflow in the test section, a proportional …
The Earliest Drawings Of Dogs,
2020
Utah State University
The Earliest Drawings Of Dogs, Myles Bradley
Fall Student Research Symposium 2020
The oldest depictions of dogs ever found are over 8,000 years old, found carved into a cliff in the desert of Saudi Arabia. Studies show, however, that dogs are found coexisting with humans as far back as 30,000 years ago. If this is the case, "Why does it take so long for dogs to appear in human artwork?" Dogs have certainly been an integral part of human society for almost as long as they've been around, so what do these early images reveal about the ancient relationship between dogs and man? This paper explores possible answers to both of these …
Static Heat Exchanger For The Wireless Charging Of Electric Vehicles,
2020
Utah State University
Static Heat Exchanger For The Wireless Charging Of Electric Vehicles, James Mullen
Fall Student Research Symposium 2020
The USU College of Engineering partnered with the Aspire NSF Engineering Research Center to develop wireless charging pads for electric vehicles. These concrete pads, when placed in roadways, charge the batteries of electric vehicles that pass over them. As the pads charge vehicles, they produce excessive thermal energy (heat), which dissipates slowly through the surrounding concrete. This excess heat reduces the efficiency of the charging apparatus and can damage the imbedded electrical components. To manage the pad temperatures, the USU Nanoscale Thermal Energy Lab proposed to submerge the heat-generating elements in a Phase Change Material (PCM). As a solid, a …
The Dog As A Trend In Art,
2020
Utah State University
The Dog As A Trend In Art, Whitney Stewart
Fall Student Research Symposium 2020
I have always believed that art is one of the biggest forms of communication and signs of cultural assimilation and it has been throughout history. I choose to explore the role that dogs play in this theme. From changes in the symbolism of the dog and the ethics of breeding, art reveals a lot about our furry friends. While I learn much about dogs by themselves, the way we represent them also says a lot about our society. Do we see animals as more than us in some way and less in others? Is a dog painting really about the …
Simulation And Analysis Of 4-D Airspace Closures Due To Commercial Space Operations: Impacts On Airlines And General Aviation,
2020
Embry-Riddle Aeronautical University
Simulation And Analysis Of 4-D Airspace Closures Due To Commercial Space Operations: Impacts On Airlines And General Aviation, Janet K. Tinoco, Noah D. Eudy, Maxwell Cannon
Journal of Aviation/Aerospace Education & Research
When industries share key portions of their eco-systems, industry-industry competitive and structural pressures can inhibit the advancement of both. In the case of aviation and commercial space, an eco-system component critical to both industries is shared airspace. The integration of air and space activities in a safe, efficient, effective, and equitable manner is compulsory for both industries to grow and thrive. In order to develop solutions, one must first understand the effects of space operations on current national airspace system (NAS) users. By using actual flight data in a simulation environment of space operations out of Cape Canaveral, Florida, we …
Configuration Management Challenges Of Model Based Systems Engineering On Multiple Variant Aircraft Fleets,
2020
Embry-Riddle Aeronautical University
Configuration Management Challenges Of Model Based Systems Engineering On Multiple Variant Aircraft Fleets, David R. Zubowski
Journal of Aviation/Aerospace Education & Research
Naval Air Systems Command (NAVAIR) is moving from traditional Systems Engineering (SE), focusing on managing documentation, to Model Based Systems Engineering (MBSE), focusing on a system model (All Partners Access Network, n.d.). As NAVAIR transitions to an MBSE standard, controlling the Configuration Management (CM) of a fleet of a single series of aircraft in varying states of engineering change incorporations will be critical. Traditional systems engineering and configuration management are both text document focused disciplines that have existed since the end of World War II. The method chosen to conduct the research was by performing a case study on MBSE …
Cnn Classification Architecture Study For Turbulent Free-Space And Attenuated Underwater Optical Oam Communications,
2020
Utah State University
Cnn Classification Architecture Study For Turbulent Free-Space And Attenuated Underwater Optical Oam Communications, Patrick L. Neary, Abbie T. Watnik, Kyle Peter Judd, James R. Lindle, Nicholas S. Flann
Space Dynamics Laboratory Publications
Turbulence and attenuation are signal degrading factors that can severely hinder free-space and underwater OAM optical pattern demultiplexing. A variety of state-of-the-art convolutional neural network architectures are explored to identify which, if any, provide optimal performance under these non-ideal environmental conditions. Hyperparameter searches are performed on the architectures to ensure that near-ideal settings are used for training. Architectures are compared in various scenarios and the best performing, with their settings, are provided. We show that from the current state-of-the-art architectures, DenseNet outperforms all others when memory is not a constraint. When memory footprint is a factor, ShuffleNet is shown to …
Entrainment Processes For A Jet In Cross-Flow: The Quantification Of Turbulent Contributions And Their Importance On Accurate Modeling,
2020
Portland State University
Entrainment Processes For A Jet In Cross-Flow: The Quantification Of Turbulent Contributions And Their Importance On Accurate Modeling, Graham Asher Freedland
Dissertations and Theses
A jet in cross flow (JICF) is examined experimentally by injecting a stream of air into crossing fluid with an aim into quantifying entrainment process and downstream evolution. The behavior of JICF is important to fields ranging from turbine-blade cooling to smokestack pollution and volcanic eruption dynamics. Existing simplified volcanic plume models are tested; most importantly, the near-field contributions of complex interconnected vortex systems, which present significant uncertainties because they assume negligible turbulence. While jets in irrotational cross-flow have been investigated, this analysis has focused on the interaction between a turbulent jet in low and highly turbulent cross-flow created by …
Very Light Jet Trainer (Vlj) - Phoenix Iv,
2020
Kennesaw State University
Very Light Jet Trainer (Vlj) - Phoenix Iv, Saxton Robinson, Eric Gentry, Daniyel Holmes, Navee Cheng
Senior Design Project For Engineers
This project was pursued to bring another possible solution to a major problem within the pilot training industry. When it comes to pilots training with aircraft, they must often use repurposed older aircraft to log their training hours. With few options when it comes to aircraft that are designed specifically for training, we have researched, modeled, and simulated tests for our own trainer jet to add to the market. The aircraft was designed to seat 4-8 people (1-2 for crew and 2-6 for passengers), weigh less than 10,000 lbs., have a range of about 1195.5 nautical miles, have a max …
The Varied Thermal Response Of Magnetic Iron-Oxide Nanoparticles During Induction Heating In Liquid And Solid-Liquid Phase Change Mediums,
2020
University of Arkansas, Fayetteville
The Varied Thermal Response Of Magnetic Iron-Oxide Nanoparticles During Induction Heating In Liquid And Solid-Liquid Phase Change Mediums, Joshua Tompkins
Graduate Theses and Dissertations
This study investigates the induction heating response of uncapped iron oxide nanoparticles sonically dispersed as a nanofluid and mechanically distributed in solid phase change materials. The nanoparticles examined have a mean diameter of 14.42 nm and are magnetically heated in an alternating magnetic field at an amplitude of 72.6 kA/m at frequencies of 217, 303, and 397 kHz. Nanoparticle characterization was undertaken through transition electron microscopy, x-ray diffraction, and dynamic light scattering when in suspension. Carrier fluids were characterized through viscosity, heat capacity, and density measurements which were used in the calorimetric calculation of the specific absorption rate (SAR) of …
Nanoscale Mechanics Of Disordered Biomolecules In Brain,
2020
University of Texas at Arlington
Nanoscale Mechanics Of Disordered Biomolecules In Brain, Md Ishak Khan
Mechanical and Aerospace Engineering Dissertations - Archive
The long-term objective of this dissertation is to link blast-induced traumatic brain injury (TBI) with multiscale, multiphysics damage evolution in the brain using experimentally verifiable computations and simulations. The short-term goal is to conduct modeling and simulation to correlate dynamic mechanical loading to damage in sub-axonal components. It is known that the interior of the brain at the macroscale (10^-1 m) is composed of two distinct components, the grey matter, and the white matter. Within the cortex, the grey matter primarily takes the form of cortical columns (mesoscale: 10^-3 m), which are six layered structures, each composed of 8-10 thousand …
Analytical And Experimental Studies On Mixing In Supersonic Flows,
2020
University of Texas at Arlington
Analytical And Experimental Studies On Mixing In Supersonic Flows, Vijay Gopal
Mechanical and Aerospace Engineering Dissertations - Archive
Mixing enhancement in supersonic flow is an important domain of research for enabling the realization of efficient and scalable high speed air-breathing engines (scramjet). Introducing streamwise vorticies in supersonic flow and tailoring their interactions for mixing enhancement is the primary motivation for the present research study. Leveraging the research performed in the group at the Aerodynamics Research Center (ARC), systematic experimental studies on mixing enhancement is carried out in supersonic flows by tailoring the selected modes of streamwise vortex interactions with the aid of in-house developed reduced order method VorTX. This method utilizes the lifting line-vortex theory in supersonic flow …
