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Articles 301 - 330 of 677
Full-Text Articles in Mechanical Engineering
Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser
Investigation Of Additive Manufacturing Using Industrial Robots, Matt Heuser
Mechanical and Aerospace Engineering Theses - Archive
Conventional additive manufacturing platforms are controlled using G-code, a numerical control language used to define the process parameters and move- ment of the print head. First, a digital model of the desired shape is created using 3-D computer graphics software. Then the model is analyzed by software tools that generate the necessary G-code instructions to be used by a 3-D printer to produce the desired object. The goal of this research is to lay the foundation and develop the necessary tools to 3-D print custom objects based on the viscous extrusion process using industrial robots. The first task is to …
Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare
Computational Study Of Differential Capacitance-Double Layer Relationship In A Supercapacitor, Pranav Milind Phadtare
Mechanical and Aerospace Engineering Theses - Archive
Energy crisis is one of the most pressing problems that the world is facing. It involves a number of issues to be addressed in energy sources, transportation, storage, etc. Novel ways of energy storage are being actively explored. Electrical energy is stored by using devices such as batteries, capacitors, supercapacitors, etc. Supercapacitor seems to be a promising technology for this purpose. Traditionally, batteries have high energy densities but low power delivering density. On the other hand, conventional capacitors are capable of delivering high power densities but possess low energy storage density. Supercapacitors are a bridge between the two devices. Of …
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness, Trina Barua
A Comparative Study Of The Thermo-Mechanical Behavior Of Wcsp Assembly Due To Difference In Pcbs’ Layer Thickness, Trina Barua
Mechanical and Aerospace Engineering Theses - Archive
The reliability of Chip Scale Package assembly is of great concern for the electronic industry. Due to multiple function integration of the present devices there is a high demand of ultra-miniaturization of the integrated parts to build the inside circuit assembly. Wafer Level Chip Scale Packages (WLCSP) are used in the industry to meet the challenges of these miniaturization due to its form factor, not so high cost and packaging efficiency which is also very high despite the known and unknown reliability issues. WLSCPs use packaging technology at the wafer level which is an extension of the wafer fab process …
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani
Determining Intruder Aircraft Position Using Series Of Stereoscopic 2-D Images, Aditya Ramani
Mechanical and Aerospace Engineering Theses - Archive
Introduction of UAV (Unmanned Aerial Vehicles) into the NAS (National Air Space) requires the detect-and-avoid capability. That is, an aircraft should be able to detect other aircraft flying in the same airspace volume and make evasive maneuvers if there is potential conflict. One potential methods currently investigated for detection of an intruder aircraft is to process digital images taken by onboard cameras. When and if intruder aircraft detection is successful through image processing, avoidance algorithms can greatly benefit from the relative position information. This thesis research investigates methods to compute the position of an intruder aircraft relative to an observer …
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate, Vimalan Adaikalanathan
Numerical Study On Morphology And Solidification Characteristics Of Successive Droplet Depositions On A Substrate, Vimalan Adaikalanathan
Mechanical and Aerospace Engineering Theses - Archive
Successive droplet impingement finds extensive applications in additive manufacturing technologies such as 3D printing, Liquid Metal Jetting and Net Form Manufacturing. Deposition, deformation and solidification of droplets are the constitutive stages in the process which determine the final outcome. Detailed knowledge about the flow behaviour, phase transformation and free surface deformation is required to have a complete understanding and optimization of the process parameters. Experimental research in this field is only limited to imaging techniques and post solidification analysis which only provide superficial information while overlooking most of the governing phenomenon. Knowledge of the physics governing the fluid and thermal …
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices, Yasir Aziz Modak
Cfd Analysis Of Vapor Chamber With Micro Pillars As Heat Spreader For High Power Electronic Devices, Yasir Aziz Modak
Mechanical and Aerospace Engineering Theses - Archive
The recent trend in electronic industry shows that there is large power dissipation from the electronic devices and at the same time their sizes are getting smaller. This large power dissipation takes place in the form of releasing heat energy. It is observed that heat dissipation from the electronic devices is high and source size is small. The high device temperatures result in decreased reliability and increased failure rates. This difficulty can be addressed by controlling the temperatures at the source of heat generation. In chip scale package chip is the major source of heat generation. Thus our priority is …
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling, Sumanth Krishnamurthy
Experimental And Computational Board Level Reliability Assessment Of Thick Board Qfn Assemblies Under Power Cycling, Sumanth Krishnamurthy
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-Lead Package (QFN) is one of the latest cutting edge technologies that took the industry by storm due to its excellent electrical and thermal performance, compact size and low cost. Due to its compact size, QFN package is an ideal choice for handheld portable applications and where package performance is required. In QFN packages, the electrical contact to the Printed Circuit Board (PCB) is made through soldering of the lands underneath the package body rather than the traditional leads formed along the perimeter. However, using thick PCBs can be detrimental to the reliability of the package. The motivation …
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels, Brady C. Lotz
Effect Of Structural Variations On Thermal Deformation Of Single Curvature Composite Sandwich Panels, Brady C. Lotz
Mechanical and Aerospace Engineering Theses - Archive
Composite structures cured at a high temperature in a contoured female mold have a tendency to deform or spring-in when brought down to room temperature from cure temperature. This thesis investigates the effects of various structural parameters on the spring-in of the curved shape of a composite sandwich panel due to thermal deformation. A finite element model of a single curved composite sandwich panel is developed using 3D shell elements and validated against other published articles and classical lamination theory. Using a control structure of AS4/3501-6 carbon/epoxy with half inch Nomex honeycomb core with a layup of [0°/90°/0°/90°/Core/90°/0°/90°/0°]T, structural parameters …
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling, Parth Jayeshkumar Soni
Performance Evaluation Of Plate-Fin And Pin-Fin Heat Sinks For The Application Of Oil Immersion Cooling And Design Optimization Of Dynamic Cold Plate For The Application Of Warm Water Cooling, Parth Jayeshkumar Soni
Mechanical and Aerospace Engineering Theses - Archive
In IT industries, to keep server rooms and data centers cool is a constant challenge for hardware developers and the cooling solution providers. Air cooling is the most widely used approach for thermal management of servers in data centers from many years. However, the scenario is changing gradually as the computational ability of data center is increasing exponentially. Because of increasing computational ability, the heat generated by the servers is increased in such amount that air cooling is not as efficient as it was before. Hence, alternative cooling system is required. In 1970’s the idea of liquid cooling was introduced. …
Control Strategies For Air-Side Economization, Direct And Indirect Evaporative Cooling And Artificial Neural Networks Applications For Energy Efficient Data Centers, Abhishek Guhe
Mechanical and Aerospace Engineering Theses - Archive
The skyrocketing growth in data centers, facilities that house information technology (IT) equipment for storage, management and distribution of data while striving for 24/7/365 operation with 100% up-time, has accounted for 1.3% of global energy use. A significant portion of data center energy is dedicated to removing the heat generated by IT equipment to maintain safe operating conditions and optimum computing performance. Energy efficient cooling of data center is of vital importance. One of the options for significantly cutting the cooling cost is the use of air side economization (ASE), Indirect evaporative cooling (IEC) and Direct evaporative cooling (DEC) without …
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors, Neha Inamdar
Optimization Of Air Cooled Portion In A Server With Water Cooled Micro-Processors, Neha Inamdar
Mechanical and Aerospace Engineering Theses - Archive
A Data center is the heart of our associated world. It is a facility that houses computer systems and related components. According to IDC, because of enormous increment in pattern of IoT (Internet of Things) and distributed computing the introduced limit of server farm workloads will increment by around 750% around 2014 and 2019. Data center spaces can consume up to 100 to 200 times as much power as standard office spaces. With such huge influence utilization, they are prime focuses for vitality proficient outline measures that can spare cash and lessen power use. In a regular Data center with …
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water, Pratik Babanrao Kale
A Study Of Electrical Double Layer Structure Over A Corroding Steel Surface In Sea Water, Pratik Babanrao Kale
Mechanical and Aerospace Engineering Theses - Archive
Corrosion is a natural deterioration phenomenon that throws profound adverse effects on the performance of structural steel in marine applications. Seawater consists of various corrosive components such as chlorine ions, sulphate ions and many more. These chemical components are mainly responsible for the corrosion phenomenon. Even though their bulk concentrations are known, their local concentrations and distribution in the vicinity of a steel surface where the corrosion occurs are yet unclear. Without the knowledge, would any approach to deal with the corrosion be empirical, at best. The main objective of the present thesis is to investigate the interfacial structure of …
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft, Shehzad Maksudahmad Shaikh
Analysis Of An Artificial Tailplane Icing Flight Test Of A High-Wing, Twin-Engine Aircraft, Shehzad Maksudahmad Shaikh
Mechanical and Aerospace Engineering Theses - Archive
The US Air Force Flight Test Center (AFFTC) conducted a civilian, Federal Aviation Administration (FAA) sponsored, evaluation of tailplane icing of a twin-turboprop business transport at Edwards Air Force Base. The flight test was conducted to evaluate ice shape growth and extent of ice on the tailplane for specific weather conditions of Liquid Water Content (LWC), droplet size, and ambient temperature. This work analyzes the flight test data comparing the drag for various tailplane icing conditions with respect to a flight test verified calibrated aircraft model. Although less than a third of the test aircraft was involved in the icing …
A Mesh Based Boom To Stop Oil Spread, Bharathram Visweswaran
A Mesh Based Boom To Stop Oil Spread, Bharathram Visweswaran
Mechanical and Aerospace Engineering Theses - Archive
In this work, we develop a new boom to separate oil and water. In a commonly used boom, a membrane that has no pores is normally used to block oil spread. Since this membrane also blocks water flow, high pressure is easy to build on such a membrane to break or damage it. To solve this problem, in the new boom, the membrane is replaced with a hydrogel-coated mesh. The hydrogel-coated mesh has dual properties of superhydrophilicity and superoleophobicity. Accordingly, water can still go through the mesh, while oil cannot. Subsequently, liquid pressure on the mesh is reduced. In this …
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water, Tanmay Sanjeev Gupte
Analysis Of Electric Double Layer Structure Formed During Corrosion Of Steel Pipes Carrying Potable Water, Tanmay Sanjeev Gupte
Mechanical and Aerospace Engineering Theses - Archive
Corrosion of steel pipes carrying drinking water is a universal issue. It affects human health as the corrosion sediments in these pipes can be toxic and unfit for consumption. Further, the amassing of the corrosion products can lead to operational difficulties. Drinking water consists of anions like carbonate, hydroxides and chloride ions which are responsible for the corrosion process. In such types of aqueous corrosion, there is an interfacial region formed between the corroding metal and the bulk of the aqueous environment. This interfacial region is called the Electrical Double Layer. In this article, we direct to study the effects …
Reliability Challenges In Airside Economization And Oil Immersion Cooling, Jimil Manojbhai Shah
Reliability Challenges In Airside Economization And Oil Immersion Cooling, Jimil Manojbhai Shah
Mechanical and Aerospace Engineering Theses - Archive
The Datacom facility which comprises rooms or closets used for communication, computers/servers or electronic equipment requires cooling unit which consumes 31% (23% HVAC cooling + 8% HVAC fans) of overall energy. The ASHRAE TC9.9 subcommittee, on Mission Critical Facilities, Data Centers, Technology Spaces, and Electronic Equipment, has suited the data center’s executives by permitting brief period outings of the environmental conditions outside the prescribed temperature-humidity range, into passable extents A1-A4. To comprehend the expanding server densities and the required cooling vitality costs, data center operators are falling back on cost cutting measures. For instance, they are not firmly controlling the …
Harvesting Of Water From Fog Using Sponges, Jae Jun Lee
Harvesting Of Water From Fog Using Sponges, Jae Jun Lee
Mechanical and Aerospace Engineering Theses - Archive
Supervising Professor: Cheng Luo A sponge has porous structures. It is capable of both storing and transmitting water. In this work, we explored the possibility of applying three different types of sponges to collect fog. We also compared their fog-collection efficiencies with that of a typical Raschel mesh that is widely used in the field to collect fog. We found that, for three different fog speeds, the fog-collection efficiencies of three tested sponges were 39% to 93% those of the typical Raschel mesh, indicating that the sponges could serve as alternative fog collectors when well-developed collectors were not available. Sponge …
Cooling And Packaging Of Accumulators For Formula Sae Electric Car, Hang Yin
Cooling And Packaging Of Accumulators For Formula Sae Electric Car, Hang Yin
Mechanical and Aerospace Engineering Theses - Archive
Electric car is the future of automotive industry. The performance of the batteries is vital for that of electric cars. Overheating will compromise the performance of batteries, shorten the life span and even damage the battery permanently. So it is crucial to have an efficient packaging and cooling method. This project using Formula SAE Electric car as the testing ground is dedicated to develop the efficient way of thermal and electronic packaging of accumulators for automobiles.
Development And Flight Test Of Moving-Mass Actuated Unmanned Aerial Vehicle, Sampath Reddy Vengate
Development And Flight Test Of Moving-Mass Actuated Unmanned Aerial Vehicle, Sampath Reddy Vengate
Mechanical and Aerospace Engineering Theses - Archive
Conventional airplane control is achieved by aerodynamic control surfaces by generating moments around all the three axes of the aircraft. Defections of the control surfaces have some disadvantages such as induced drag, increase in radar signature, and exposure to high temperature in high speed applications. As an alternative moment generation mechanism, prior research proposed internal mass-actuation, which is to generate gravitational moment by changing the center of gravity of the aircraft through motion of internal masses within the aircraft. Prior research investigated the feasibility and benefit of internal mass-actuation in airplane control based on simulation analysis. The main focus of …
Numerical Studies On Spin Coating Of Metals, Varun Nanjunda Rao Viswamithra
Numerical Studies On Spin Coating Of Metals, Varun Nanjunda Rao Viswamithra
Mechanical and Aerospace Engineering Theses - Archive
Spin coating is a surface coating process which involves spreading a liquid dispensed on the center of a rotating substrate. The liquid is discharged using a suitable method on to the substrate rotating at a constant angular speed. The spinning speed is controlled to obtain a coating of desired thickness with faster spinning resulting in thinner coating. The thickness of the coating also depends on the properties of the fluid and other process parameters. Centrifugal force is introduced into the code as radial component of acceleration. The first part of the code solves the continuity and the Navier-Stokes equations, with …
Cfd Analysis And Design Optimization Of Heat Sink For Oil Immersion Cooling, Koushik Epuri
Cfd Analysis And Design Optimization Of Heat Sink For Oil Immersion Cooling, Koushik Epuri
Mechanical and Aerospace Engineering Theses - Archive
Air cooling is predominant cooling technique employed in most of the data centers. As the demand for High performance computing (HPC) which deploy large concentration of high-end servers (30 kW to 200 kW per rack) is increasing, it is becoming challenging to cool the systems using air cooling. Liquid cooling has significant advantages over air cooling techniques due to higher heat capacities of fluids. Liquid immersion cooling using dielectric and non-corrosive mineral oils is one of the potential alternative to air cooling methods for high density data centers. In this work, we consider a third generation open compute server optimized …
Design And Stiffness Optimization Of Quadri-Directional Composite Grid Lattice Structures, Gajendra Devanga Gangadara
Design And Stiffness Optimization Of Quadri-Directional Composite Grid Lattice Structures, Gajendra Devanga Gangadara
Mechanical and Aerospace Engineering Theses - Archive
Composite grid structures are rib stiffeners connected to each other rigidly in a pattern or a lattice such that the whole grid pattern has certain smeared stiffness property and has a certain structural behavior. The main focus of this thesis is to design the geometric pattern of a Quadri-directional composite grid lattice such that it has the prescribed stiffness moduli. The research is divided into three phases, in the first phase, the equation for stiffness moduli, the reduced stiffness matrix [Q] and the laminate stiffness matrices [ABD] of the grid pattern is derived for Quadri-directional grid panels. In the second …
Development Of A Methodology And Sample Preparation To Evaluate Reliability Of Oil Cooled Data Center, Venkata Naga Indu Sravani Kota
Development Of A Methodology And Sample Preparation To Evaluate Reliability Of Oil Cooled Data Center, Venkata Naga Indu Sravani Kota
Mechanical and Aerospace Engineering Theses - Archive
Liquid immersion cooling is not a new concept which is slowly emerging as an alternative solution to conventional chilled air cooling systems for data centers. The main idea is to build a body of knowledge to help industry make more informed regarding mechanical reliability of IT equipment in mineral oil immersed systems. The goal is to develop a testing procedure for evaluating the reliability of electronic packages and components when immersed in mineral oil. PCB’s, chip packages, passive components like capacitors, inductors, resistors, diodes, cables and wiring form the most important parts of a server used in data centers. The …
Neural Network Modeling And Control Of Data Center, Nachiket Rajendra Kansara
Neural Network Modeling And Control Of Data Center, Nachiket Rajendra Kansara
Mechanical and Aerospace Engineering Theses - Archive
Data Center has become a definitive element of Modern IT infrastructure. With the development of high performance computing architectures and equipment, data centers consume large amount of electricity. Due to low Demand/Supply ratio of electricity production there is need to develop ways to reduce power footprint. Many researchers are working on approaches to resolve problems related to en- ergy usage of Data Center. One of these approaches is to develop a model-based control system that would control data centers in efficient way to reduce power footprint. Computational Fluid Dynamic (CFD) has been used to model the dynamic and complex environment …
Impact Of Layer Thickness Of Qfn Package Mounted Printed Circuit Boards During Drop Testing, Sayalee Pradeep Sabne
Impact Of Layer Thickness Of Qfn Package Mounted Printed Circuit Boards During Drop Testing, Sayalee Pradeep Sabne
Mechanical and Aerospace Engineering Theses - Archive
In past studies, it was established that board level reliability of the packages depends mainly upon the design of the package and the soldering technology used for mounting the components. There are many methods to test the reliability, such as temperature cycling test, bend test, power cycling, etc. which have been studied and practiced. We need to consider the failure rate and failure mechanism both, to understand how specific loading conditions affect the failure of an assembly. In this study, PCB’s with variable thicknesses and QFN package mountings are subjected to drop test. It has been observed previously that the …
Fabrication And Characterization Of Low-Density Polymeric Materials With 3d Microstructures, Hakan Arslan
Fabrication And Characterization Of Low-Density Polymeric Materials With 3d Microstructures, Hakan Arslan
Mechanical and Aerospace Engineering Theses - Archive
Low-density polymeric materials with octet-truss and quad-truss 3D microstructures were studied. The materials with 3D microstructures were created using digital light processing technology with polyethylene glycol (PEG). The mechanical properties of the materials with different relative densities were characterized in air and water. The experimental results were also compared and analyzed with the results from simulation studies. This work reveals that the material with octet-truss microstructures stand at least three times higher deformation than the materials with quad-truss microstructures. The polymeric material with internal 3D microstructures also shows a higher water absorption rate than the same material without internal microstructures.
Non Thermal Reliability Considerations For Oil Cooled Data Centers And Its Serviceability, Sahithi Reddy Nagilla
Non Thermal Reliability Considerations For Oil Cooled Data Centers And Its Serviceability, Sahithi Reddy Nagilla
Mechanical and Aerospace Engineering Theses - Archive
The interest in Oil immersion cooling is increasing day by day which can be attributed to the recent research that shows the potential of its performance when compared to other techniques that add a little more expenses to the organization. Even though the performance of oil immersion cooling has its own capabilities and advantages, this technique is not widely adopted and there is limited published information regarding the important aspects of the design of the system. This paper presents the non-thermal aspects of oil immersion cooling and explains the chemistry of mineral oil and the factors that affect its performance. …
Quantitative Evaluation Of A Thrust Vector Controlled Transport At The Conceptual Design Phase, Vincent Patrick Ricketts
Quantitative Evaluation Of A Thrust Vector Controlled Transport At The Conceptual Design Phase, Vincent Patrick Ricketts
Mechanical and Aerospace Engineering Theses - Archive
The impetus to innovate, to push the bounds and break the molds of evolutionary design trends, often comes from competition but sometimes requires catalytic political legislature. For this research endeavor, the ‘catalyzing legislation’ comes in response to the rise in cost of fossil fuels and the request put forth by NASA on aircraft manufacturers to show reduced aircraft fuel consumption of +60% within 30 years. This necessitates that novel technologies be considered to achieve these values of improved performance. One such technology is thrust vector control (TVC). The beneficial characteristic of thrust vector control technology applied to the traditional tail-aft …
Thermal Analysis Of Disk Brake In Order To Study The Brake Fluid Vaporization Phenomenon Of A Formula Sae Car, Anurag Dey
Mechanical and Aerospace Engineering Theses - Archive
The brake system is inarguable one of the most critical aspect of a vehicle safety. It has always been the major concern for design engineers to develop a system that gives a steady performance with respect to time. In order to achieve that feat, one of the most common problems that arises in maintaining a brake is the problem of brake fluid vaporization. Brake fluids, being hygroscopic in nature, absorb moisture over a period of time. It is one of the prime reasons for reducing the longevity of brake fluid volume inside the brake caliper as the boiling point of …
Automatic Carrier Landing System For V/Stol Aircraft Using L1 Adaptive And Optimal Control, Shashank Hariharapura Ramesh
Automatic Carrier Landing System For V/Stol Aircraft Using L1 Adaptive And Optimal Control, Shashank Hariharapura Ramesh
Mechanical and Aerospace Engineering Theses - Archive
This thesis presents a framework for developing automatic carrier landing systems for aircraft with vertical or short take-off and landing capability using two different control strategies - gain-scheduled linear optimal control, and L1 adaptive control. The carrier landing sequence of V/STOL aircraft involves large variations in dynamic pressure and aerodynamic coefficients arising because of the transition from aerodynamic-supported to jet-borne flight, descent to the touchdown altitude, and turns performed to align with the runway. Consequently, the dynamics of the aircraft exhibit a highly non-linear dynamical behavior with variations in flight conditions prior to touchdown. Therefore, the implication is the need …