Mechanical Engineering Commons^™

Design And Analysis Of A Pipe And Pump System Constructed To Connect Port Canaveral To The Banana River, Nicole Ann Mcclain

Theses and Dissertations

The Indian River Lagoon (IRL) has hosted an extensive array of plants and animals throughout its lifetime, having one of the greatest species’ diversity of all North American estuaries. In addition to the variety of marine wildlife that is supported by the IRL, the system is also a recreational and economic resource for the counties bordering it. The biological integrity of the IRL, however, has shown evidence of decline in the last few decades, due to impaired water quality caused by pollution and disruptions to natural circulation patterns. If far-reaching changes are made to repair the water quality of the …

Optimization Of 3d Printed Mold Performance For Injection Molding Via Hollow Infill Patterns, Alan Fong

University Honors Theses

The applicability of hollow infill patterns has been explored for its applications in making 3D printed polymer-based injection molds in the additive manufacturing industry. Hollow infill patterns offer a significant reduction in material costs as well as the opportunity for reducing the cooling times via pumping a coolant fluid through the hollow cavity in a similar fashion to traditional conformal cooling channels. A 3D Jacks Support Hollow mold model was determined to be the best performing design. FEA analysis was conducted to determine the maximum reduction in internal volume (percentage of material saved) that could be achieved without exceeding the …

Jme 4110: Vibratory Parts Feeder, Adin Stambolic, Patrick Edward Vastola, Noah Herrin

Washington University / UMSL Mechanical Engineering Design Project JME 4110

Design an inexpensive, modular and tunable vibratory feeder to move different size particles from one place to another. The feeder can change according to the shape and size of the particles while in use.

Enhanced Solar Receiver Design: Using Modern Materials And Manufacturing Methods, Paul John Kepinski

Theses and Dissertations

Solar receivers are a core component in receiver technology used for solar thermal power plants that use mirror reflectors to concentrate solar radiation onto a single point. This point is where the solar receiver is located. The energy is transferred into a medium that can either be stored for overnight power needs or can be used immediately to generate steam to power an electrical grid. The purpose of this research is to see if efficiency of a solar receiver can be increased substantially using newer methods of 3D metal manufacturing and material sciences. The recommended solution is a cavity shaped …

Event-Triggered Control Architectures For Scheduling Information Exchange In Uncertain And Multiagent Systems, Stefan Ristevski

USF Tampa Graduate Theses and Dissertations

Despite the numerous advantages that networked controlled systems provide, potential network overload in these systems can severely degrade their performance and even cause catastrophic failures. To this end, the work presented in this dissertation provides a neat solution on reducing network utilization in uncertain networked controlled systems using an adaptive event-triggered control approach predicated on a novel dynamical threshold and information exchange methodology while guaranteeing closed-loop system stability.

In particular, consider a system consisting of an operator (e.g, a ground station) and an uncertain controlled dynamical system (e.g., a vehicle equipped with feedback control algorithm), where the aim of the …

Interrelation Of Thermal Stimulation With Haptic Perception, Emotion, And Memory, Mehdi Hojatmadani

USF Tampa Graduate Theses and Dissertations

Haptics is an interdisciplinary field of science that deals with how humans perceive and respond to different sensory cues perceived through touch. Thermal haptics as a branch deals with how humans perceive the temperature sensation and respond to that. The process in which thermal perception occurs is well known to researchers. What seems missing in the literature is how temperature interacts or sometimes intervenes in other physiological and psychological aspects of our lives. In this research, a series of studies are presented where the main focus was how temperature and brain interact with each other to impede or enhance our …

Effects Of Overmolding Process Parameters On Bondzone Quality, Vivek Varma Penumetsa

Theses and Dissertations

Urban air mobility (UAM) vehicles refer to small sized systems that transport people or cargo by air. In recent years, the interest in UAM vehicles has risen to combat traffic congestion, provide faster delivery times, or provide easier access to remote places. To meet potential future demand, traditional aircraft manufacturers must introduce manufacturing technologies that can cope with high production rates. One manufacturing technology aircraft manufacturers are investigating is overmolding, a manufacturing technology common to the automotive industry. Overmolding combines the manufacturing and assembly cycles into one by injection molding a component on top of a substrate. The quality of …

Simulation-Based And Data-Driven Approaches To Industrial Digital Twinning Towards Autonomous Smart Manufacturing Systems, Kaishu Xia

Theses and Dissertations

A manufacturing paradigm shift from conventional control pyramids to decentralized, service-oriented, and cyber-physical systems (CPSs) is taking place in today’s Industry 4.0 revolution. Generally accepted roles and implementation recipes of cyber systems are expected to be standardized in the future of manufacturing industry. Developing affordable and customizable cyber-physical production system (CPPS) and digital twin implementations infuses new vitality for current Industry 4.0 and Smart Manufacturing initiatives. Specially, Smart Manufacturing systems are currently looking for methods to connect factories to control processes in a more dynamic and open environment by filling the gaps between virtual and physical systems.

The work presented …

A Multi Physics Integrated Solution For A High-Pressure Stage Turbine Efficiency And Durability, Sanjay Chopra

Theses and Dissertations

World electricity demand is projected to grow at an annual rate of ~ 2.1% to year 2040₁. EIA projects nearly 50% increase in world energy usage by 2050 led by growth in Asia.[28];[29]. It is predicted that the global electricity demand grows at approximately 1.6 % per year from approximately 2008 and forecasted to approximately 2035, twice the rate of primary energy demand. This raises electricity's usage in total final energy consumption from approximately 19% in 2018 to approximately 24% in 2040. Electricity demand growth is set to be particularly strong in developing economies. .[28];[29];[38] As an enabler, to meet …

Reduced Order Modeling Based On Hybrid Snapshot Simulation, Feng Bai

Theses and Dissertations

Reduced order model (ROM) is an emerging technique for rapid and efficient numerical simulation and computation in science and engineering applications. The ROM consists of two stages: (1) the offline snapshot simulation to produce high-quality snapshot data representative of model trajectories, from which the projection subspace can be extracted and used for ROM construction; and (2) the online simulation to utilize the ROM built in stage 1. The snapshot simulation is traditionally performed with full order model (FOM) and is computationally demanding, which is one of the most critical limiting factors for the development and deployment of ROM in real-world …

Optimizing Heat Pipes With Partially-Hybrid Mesh-Groove Wicking Structures And Its Capillary-Flowing Analysis By Simulation, Guanghan Huang

Theses and Dissertations

Heat pipes are known as efficient two-phase heat transfer devices and widely utilized in thermal management of power plants and electronics. The hybrid mesh-groove wick promises to attain a higher thermal performance of the heat pipe by balancing the permeability and capillarity. However, traditional fully hybrid mesh-groove wick presents considerable condensation thermal resistance due to the condensed quiescent working fluid and thick, saturated wick.

In this study, a novel partially hybrid mesh-groove wick has been proposed to enhance the evaporation of L-shaped copper-ethanol heat pipes. L-shaped heat pipe promotes high-efficient draining of condensed liquid by gravity, while traditional straight-shaped heat …

Printing Quality Improvement For Laser-Induced Forward Transfer Bioprinting: Numerical Modeling And Experimental Validation, Jie Qu, Chaoran Dou, Ben Xu, Jianzhi Li, Zhonghao Rao, Andrew Tsin

Manufacturing & Industrial Engineering Faculty Publications

Laser-induced-forward-transfer (LIFT)-based laser assisted bioprinting (LAB) has great advantages over other three-dimensional (3D) bioprinting techniques, such as none-contact, free of clogging, high precision, and good compatibility. In a typical LIFT based LAB process, a jet flow transfers the bioink from the ribbon to the substrate due to bioink bubble generation and collapse, and the printing quality is highly dependent on the jet flow regime (stable or unstable), so it is a great challenge to understand the connection between the jet flow and the printing outcomes. To tackle this challenge, a novel computational-fluid-dynamics (CFD)-based model was developed in this study to …

Jme 4110: Data Cooling Center, Christopher Schmidt, Brennan Fogarty, Suruchi Aryal

Washington University / UMSL Mechanical Engineering Design Project JME 4110

The group will design a way to efficiently move heat within a framework of using dielectric fluid as a heat transfer medium. The heat will be removed from a data center or a simulated data center. The group will evaluate the best possible design with the understanding that cooling data centers generate a large amount of heat. The design will also be constructed in such a manner that it can be scaled up to a larger size. Dielectric fluid will be used due to its efficiency compared to that of an air cooled system or a compressed refrigerant system. Account …

Jme 4110: Portable Car Wash, Coleman Kaufman, Sara Wilson

Washington University / UMSL Mechanical Engineering Design Project JME 4110

We met with our target customer to understand their needs for the ideal portable car wash. Their key needs included use by any sized passenger vehicle, washing the car as good as a community car wash, and must be portable. We started by researching current products that could match these needs, and then we sketched four of our own designs to match our customer’s needs. With these design sketches we used a metrics tool to determine which design was the best. From there we did engineering calculations to analyze the trouble spots in our design, such as the water pressure …

The Effects Of Noise On Parametrically Excited Systems With Nonlinear Damping, Donghao Li

Theses and Dissertations

Parametric oscillators are a class of resonating systems in which a parameter, such as stiffness in a mechanical system or capacitance in an electrical system, is periodically modulated in order to alter the system response in a desired manner. A resonance effect occurs when the pump frequency is near twice of resonant frequency. Such systems are said to be “parametrically pumped,” and this pump can, above a certain amplitude threshold, destabilize the system in the absence of nonlinearities. Parametric resonance is widely observed in nature and has been employed in a large variety of engineered systems, most notably in micro-electro-mechanical …

Pore-Resolving Simulations To Study The Impacts Of Char Morphology On Zone Ii Combustion And Effectiveness Factor Models, Dongyu Liang, Simcha L. Singer

Mechanical Engineering Faculty Research and Publications

Combustion and gasification of pulverized char often occur under zone II conditions, in which the rate of conversion depends on both heterogeneous reaction and gas transport within the particle's porous structure. The morphology of porous char has a strong influence on intra-particle diffusion, and thus, on the overall conversion rate. Because pulverized coal and biomass char particles are often irregularly shaped and contain pores and voids which can approach the size of the particles themselves, conventional models based on spherical symmetry and coarse-grained, upscaled, effective continuum conservation equations are not applicable or appropriate. A recent 3-D, pore-resolving CFD simulation approach …

The Effect Of Through Thickness Reinforcement On Debonding Behavior Of Skin/Stringer Configuration, Yogaraja Sridhar

Mechanical & Aerospace Engineering Theses & Dissertations

Investigation of this study is to the determine the crack propagation and disbonding in the bonded region of the skin and stringer specimen. An adhesive layer has been used to bond the skin and stringer by using a heat press operation. After the bonding, a drilling method has been adopted to install the through thickness reinforcement in the specimen. The key role of the through thickness reinforcement is to increase the stiffness and strength of the panels and to prevent the crack propagation or disbonding of the panels. The reinforcement was installed in pure (Pristine) samples and in defect samples …

Impact Of Regional Climate Changes On Changes In River Water Content In Uzbekistan, A.T. Salokhiddinov, P.A. Khakimova, R.V. Toryanniova, O.A. Ashirova, A.G. Gofurov

Irrigation and Melioration

The paper presents the research results on the analysis of the climate change impacts on the potential of water resources in Central Asia. We analyzed the materials of an extensive database of monitoring data from numerous gauge stations on different river basins and satellite data information. A quantitative assessment of the transformation of river hydrographs, the growth of flow variability in the Republic of Uzbekistan's major rivers, in connection with climate change, was performed. The specific features of the impact of climate changes on changes in the water content of rivers in Uzbekistan in large and small river basins are …

Washing Technology For Medium And Highly Saline Soils, B.K. Saliev, M. S. Yuldashev, N.O. Shaimanov

Irrigation and Melioration

The article discusses the issues of conducting field experiments to assess the reclamation conditions of soils, which are a particular issue of managing salinity and water-salt regime, as well as increasing the efficiency of desalination. Today, 46.6% of the irrigated lands of the Republic of Uzbekistan have salinization of varying degrees, of which 30.9% are weak, 13.3% are moderate and 2.5% are highly saline. Medium and highly saline lands make up 15.8%. The essence of the proposed method of flushing from the traditional one is that in late autumn or winter, the collectors-ditches are closed, and the groundwater is artificially …

Distribution Of Calcium And Its Reserve Forms In Widespread Irrigated Gray Meadow Soils Of The Syrdarya Region, A. Akhatov

Irrigation and Melioration

The article examines the uneven distribution of calcium in reserve (general, potential, close and labile) forms in irrigated and gray-earth-meadow soils of the experimental section of the NIISSAVKH of the Gulistan district of the Syrdarya region and the farms "Sokhil" and "Ak altin" in irrigated meadow soils the form of a close reserve in the soil profile is 310 mg per 100 gr of soil. The upper layer of highly saline, medium loamy soil gradually decreases at a depth of 60-76 cm. layer. The labile calcium reserve in irrigated serozem-meadow, highly saline, medium loamy soils varies from 175 to 260 …

Design Of A Channel Straightening Route Using A Combined Dam With A Through Part Made Of Tetrahedra, M.R. Bakiev, A.B. Хаlimbetov, С.Э. Шукурова, I.J. Asamatdinov

Irrigation and Melioration

The design of the route when regulating riverbeds, the direction of the flow to the point of water intake will require solving some issues, including the amount of deviation of the dynamic axis of the flow, constrained by regulatory structures. The main purpose of this work is to develop a method for calculating the deviation of the dynamic axis of a flow that is one-way constrained by a combined dam, then through part of which is made of tetrahedra. The problem is realized using the Varignon theorem and the flow conservation equation written for the streamlines where the household state …

Improvement Of Informational-Methodological Provision On Foreign Languages For Teachers, G. Eshchanova

Irrigation and Melioration

The article discusses the innovative areas of activity, related to the use of information and communication technologies in the educational process of teachers in foreign languages in the world practice, the development of teachers professional communicative competence in teaching English, the use of information and communication, advanced pedagogical technologies in teaching to ensure the solution of such issues, as the increase in the level of development of foreign language skills, diagnostic technologies among teachers.

Дождеваsome Aspects Of Water Management In The Republic Of Uzbekistan During The Period Of Independence (Reality And Forecast), S. Khodjaev

Irrigation and Melioration

To date, there is no alternative to the introduction of the principles of integrated water resources management (IWRM), this is proved by the research of SIC ICWC on the territory of the South Fergana main canal, where the specific water supply per hectare of irrigated area has been reduced by 32% on an area of 120 thousand hectares, that is up to 7 thousand m³/ha, instead of the limited ones 10 thousand m³/ha. Researches recommend cutting off all types of collector-drainage waters (CDW) from the river trunks of the Aral Sea basin, including the Syr-Darya and Amu-Darya, since CDW are …

The Influence Of Gender Approaches On Education Efficiency, G. Eshchanova

Irrigation and Melioration

The given article covers the influence of gender approaches on education efficiency on the basis of statistical and scientific data, and the need to rely on the basis of the necessary knowledge for the ecologically sustainable development of women's knowledge, competence and entrepreneurship are shown. The educational process based on Gender differences and equality contributes significantly to the development of society.

Economic Assessment Of Factors Affecting The Decision Of Households To Engage In Non-Farm Activities, Sh.A. Muratov

Irrigation and Melioration

In this study, non-farm activities and their importance were studied, and it is analysed the influence of push and pull factors on the decision of family heads to engage in non-farm activities by Probit model regression. Furthermore, it is determined their elastic coefficients. The analysed data are collected by conducting an online survey from 134 respondents. The results are showed that the decision of family heads to engage in non-farm activities was greatly influenced by their gender, education, and number of family members, electricity supply, transport services, and size of their land. Namely, the decision of the head of the …

Connected Water Heater Load Shifting And Energy Efficiency Evaluation For The Southeast: Winter Laboratory Assessment, Final Report, Florida Solar Energy Center, Karen Fenaughty

FSEC Energy Research Center®

The University of Central Florida's FSEC Energy Research Center (FSEC) and Pacific Northwest National Laboratory (PNNL) are conducting laboratory electrical load shifting experiments using the CTA-2045-A standard to demonstrate the viability of grid-connected heat pump water heaters (HPWH), compared to electric resistance water heaters (ERWH), in providing load shifting in the Southeastern United States (U.S.). The investigation applied different CTA-2045 shed and critical peak (CP) control command designs under two different water draw profiles. The highly-controlled laboratory experiments were conducted on four HPWHs and one ERWH from December 2020 through February 2021.

The research aimed to evaluate the load shifting …

Wetting Simulations Of High-Performance Polymer Resins On Carbon Surfaces As A Function Of Temperature Using Molecular Dynamics, Swapnil S. Bamane, Prashik S. Gaikwad, Matthew Radue, S. Gowtham, Gregory M. Odegard

Michigan Tech Publications, Part 1

Resin/reinforcement wetting is a key parameter in the manufacturing of carbon nanotube (CNT)-based composite materials. Determining the contact angle between combinations of liquid resin and reinforcement surfaces is a common method for quantifying wettability. As experimental measurement of contact angle can be difficult when screening multiple high-performance resins with CNT materials such as CNT bundles or yarns, computational approaches are necessary to fa-cilitate CNT composite material design. A molecular dynamics simulation method is developed to predict the contact angle of high-performance polymer resins on CNT surfaces dominated by aromatic carbon, aliphatic carbon, or a mixture thereof (amorphous carbon). Several resin …

Identifying The Determinants And Extent Of Crop Diversification At Farm Level: A Case Study Of Uzbekistan, A.Э. Primov, M.H. Saidov, I. B. Rustamova, A.A. Abduvasikov

Irrigation and Melioration

Since independence, the government of Uzbekistan has implemented the number of agricultural policies such as making some crucial structural reforms at the farms, comprising different institutions and enhancing diversification of agricultural production in order to stabilize the agricultural sector of the country. Therefore, crop diversity has an important role in sustainable agriculture. We calculated the diversification index based on the Simpson Diversity Index method while ordinary least square (OLS) regression analysis was employed to assess the association of crop diversification on farm income using cross-sectional data from 381 farmers of Uzbekistan. The study revealed the mean computed Simpson Index values …

Control Of Change Of Phase Through Physical Surface Shaping, Troy Anderson, Sidy Ndao, Craig Zuhlke, Dennis Alexander, George Gogos

Department of Mechanical and Materials Engineering: Faculty Publications

A system embodiment includes , but is not limited to , a solid structure configure to contact each of a material in a liquid phase and a material in a vapor phase , the solid structure including a plurality of microstructures protruding at angles relative to a horizontal plane ; and a layer of nanoparticles positioned on the plurality of microstructures , the layer of nanoparticles having a composition that is at least one of a same material as the plurality of microstructures and an oxide of the same material as the plurality of microstructures , the plurality of microstructures …

Investigation Of Theoretical Scaling Laws Using Large Eddy Simulations For Airborne Spreading Of Viral Contagion From Sneezing And Coughing, K. Liu, M. Allahyari, J. Salinas, ‪Nadim Zgheib, S. Balachandar

Mechanical Engineering Faculty Publications

Using a set of large eddy point-particle simulations, we explore the fluid dynamics of an ejected puff resulting from a cough/sneeze. The ejection contains over 61 000 potentially virus-laden droplets at an injection Reynolds number of about 46 000, comparable to an actual cough/sneeze. We observe that global puff properties, such as centroid, puff volume, momentum, and buoyancy vary little across realizations. Other properties, such as maximum extent, shape, and edge velocity of the puff, may exhibit substantial variation. In many realizations, a portion of the puff splits off and advances along a random direction, while keeping airborne droplet nuclei …