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Articles 571 - 600 of 962
Full-Text Articles in Mechanical Engineering
Design And Structural Of A Fence Used For Protecting Modular Data Center From High Speed Wind, Nikhil Baviskar
Design And Structural Of A Fence Used For Protecting Modular Data Center From High Speed Wind, Nikhil Baviskar
Mechanical and Aerospace Engineering Theses - Archive
Various data centers built in an open area are occasionally susceptible to different kinds of natural calamities. Wind, either from any of the sources like hurricane, tornado or storm is one of those ecological dangers with high speed flow. These high speed winds can be responsible for downed power lines, trees and collapsing of buildings as well, the wind may adversely impact a data center’s structure. Windbreaker or wind fence is basically used to reduce the high speed of the wind resulting in the protection of structures or objects behind it. Some modular data centers which encounter problems of high …
Sustainable Methodology For The Use Of Fuel Cells In Data Centers, Vignesh Balasubramanian
Sustainable Methodology For The Use Of Fuel Cells In Data Centers, Vignesh Balasubramanian
Mechanical and Aerospace Engineering Theses - Archive
Data centers have become the lynchpin of the modern economy - from the small to medium-sized organizations, to the enterprise data centers that operates American corporations and the server farms that operate cloud-computing services accommodated by Facebook, Amazon, Google, and others. The booming of cloud storage, extensive data analysis, e-commerce, and internet traffic is also making data centers one of the rapidly growing clients of electricity in developing countries, and one of the key drivers in the construction of new power plants. Key researches are carried out for sustainable development of power usage in data centers. Fuel cells have gone …
Semi-Active Suspension System Using A Magnetorheological Damper, Abinav Suresh
Semi-Active Suspension System Using A Magnetorheological Damper, Abinav Suresh
Mechanical and Aerospace Engineering Theses - Archive
Magnetorheological (MR) Fluid changes its yield strength when it is subjected to a magnetic field. When this fluid is used inside a damper, it has the ability to change the damping coefficients when it is acted upon by magnetic fields. In this experiment, a MR damper was tested on a shock dyno, where characteristics of the damper was found. Three parameters were changed during the course of the experiment, namely: electric current supplied through the solenoid of the damper, displacement amplitude of the piston and driving frequency of the motor. The results show that there was an increase in damping …
Development Of Alkali Chlorides As Heat Transfer Fluids With Addition Of Nanoparticles, Sriram Sambasivam
Development Of Alkali Chlorides As Heat Transfer Fluids With Addition Of Nanoparticles, Sriram Sambasivam
Mechanical and Aerospace Engineering Theses - Archive
Recent studies have shown that using a single fluid for Heat Transfer and Thermal Energy Storage, improves the working and efficiency of a CSP. It improves the conversion efficiency (thermal energy to electrical) and also reduce the thermal losses due to heat exchangers by eliminating them. Other methods of storage are thermo chemical TES or phase change TES, but they require heat exchanger between HTF and TES medium, due to which the thermal losses between them are significant. CSP works on a conventional thermodynamic cycle (Rankine Cycle, Brayton Cycle) indicating that higher operating temperature are required to achieve higher efficiency. …
Dynamics And Control Of The Smart Maintenance And Inspection Robotic Free-Flyer (Smirff), Ameya Rajendra Godbole
Dynamics And Control Of The Smart Maintenance And Inspection Robotic Free-Flyer (Smirff), Ameya Rajendra Godbole
Mechanical and Aerospace Engineering Theses - Archive
The aim of the future space missions would be exploring near earth planets and asteroids. This would mean longer flight durations requiring a space habitat. Longer flight durations would require frequent maintenance and repairs of the space habitat. This would involve the risk of exposing astronauts to the harsh environments while conducting extra-vehicular activities. This risk can be minimised by using a tele-operated free- flying robot. Free- flying robots are a unique class of robots which do not have rigid fixed base and oat in space. A concept of Smart Maintenance Inspection and Robotic Free- flyer (SMIRFF) is presented in …
Analysis Of A Composite Beam With Unsymmetrical C Crossection, Martin M. Kora
Analysis Of A Composite Beam With Unsymmetrical C Crossection, Martin M. Kora
Mechanical and Aerospace Engineering Theses - Archive
The research work focuses on analysis of composite beam, where a closed form analytical solution was developed to determine the sectional properties of composite beam with unsymmetrical C cross section. The sectional properties such as centroid, equivalent axial stiffness and equivalent bending stiffness are computed. A parametric study of shear center and centroid with different layup sequences was conducted using the developed solution. The ply stresses developed in the C beam is also calculated analytically and is verified by finite element analysis. The result from the proposed theory gives excellent agreement with the ANSYS™
Test And Evaluation Of An Inlet Barrier Filter To Increase Engine Time-On-Wing For The Bell Boeing V-22 Osprey Tiltrotor, Victor Hwa
Mechanical and Aerospace Engineering Theses - Archive
The Bell Boeing V-22 Osprey Tiltrotor has seen significant deployment to austere environments where airborne sand and dust is generated due to aircraft operation on, or near, the ground. Current V-22 production aircraft are equipped with an engine air particle separator (EAPS) to remove larger particles of sand and dust, but finer particulates remain an issue for engine combustion air. A prototype engine inlet barrier filter (EIBF) has been developed as a more robust particle filtration solution. Inlet air filtration with the prototype EIBF is expected to quadruple engine time-on-wing by preventing nearly all fine particulates from entering the engine. …
Manufacturing And Characterization Of Ultra Light Bio-Inspired Nanocomposite Structures, Sushma Pothana
Manufacturing And Characterization Of Ultra Light Bio-Inspired Nanocomposite Structures, Sushma Pothana
Mechanical and Aerospace Engineering Theses - Archive
The inner part of bones is spongy cell-type three dimensional structure called cancellous bone which is the major contributor in keeping the bone weight very low. Yet, bone can sustain body weight and reasonable impact loads implying bone is a naturally optimized light-weight but strong structure. This study demonstrates a novel approach to manufacture bone-like nanocomposite structure for weight saving structural applications. For this, Silicon Carbide (SiC )nano particles are dispersed in SC-15 epoxy resin (a two part liquid resin that solidifies when mixed together at room temperature). Using our novel 3D+ manufacturing technique we developed lighter but stronger nanocomposite …
Experimental And Simulation Board Level Reliability Assessment Of Wafer Level Chip Scale Packages (Wcsps) Under Thermal Cycling, Hassaan Ahmad Khan
Experimental And Simulation Board Level Reliability Assessment Of Wafer Level Chip Scale Packages (Wcsps) Under Thermal Cycling, Hassaan Ahmad Khan
Mechanical and Aerospace Engineering Theses - Archive
Various studies have been conducted to study the effect of varying board thickness on thermo-mechanical reliability of BGA packages. Wafer level chip scale packages (WLCSP) have also been studied in this regard to determine the effect of PCB build-up thickness on the solder joint reliability. The studies clearly demonstrate that the thinner Printed Circuit Boards (PCBs) result in longer thermo-mechanical fatigue life of solder joints. Due to an extensive research, literature and past trends to support the theory that thinner PCBs perform better than thicker ones, Texas Instruments (TI) opted to move forward by decreasing the thickness of their PCBs …
Efficient Method To Cool The Data Center Using Solar Energy, Krishna Desai
Efficient Method To Cool The Data Center Using Solar Energy, Krishna Desai
Mechanical and Aerospace Engineering Theses - Archive
Solar energy is the only source which is abundantly available and which can beused to power a cooling system that is based on absorption cycle.Solar cooling system can be used to provide refrigeration for food and medicinesand comfort cooling also. Such systems are specifically applicable to the large applications having large cooling loads for particularly big periods of a year. Peak demandfor the cooling of a building and the highest availability of solar radiation are in similar phase, which makes solar cooling of any building a potential energy source andalso a green solution.In this project, The Lithium bromide-water absorption cycle …
Analytical Modeling Of Helium Turbomachinery Using Fortran 77, Purushotham Balaji
Analytical Modeling Of Helium Turbomachinery Using Fortran 77, Purushotham Balaji
Mechanical and Aerospace Engineering Theses - Archive
Advanced Generation IV modular reactors, including Very High Temperature Reactors (VHTRs), utilize helium as the working fluid, with a potential for high efficiency power production utilizing helium turbomachinery. Helium is chemically inert and nonradioactive which makes the gas ideal for a nuclear power-plant environment where radioactive leaks are a high concern. These properties of helium gas helps to increase the safety features as well as to decrease the aging process of plant components.The lack of sufficient helium turbomachinery data has made it difficult to study the vital role played by the gas turbine components of these VHTR powered cycles. Therefore, …
Design And Cfd Analysis Of The Intake Manifold For The Honda Cbr250rr Engine, Subhash Seshadri
Design And Cfd Analysis Of The Intake Manifold For The Honda Cbr250rr Engine, Subhash Seshadri
Mechanical and Aerospace Engineering Theses - Archive
The scope of this project is to improve reliability issues on a turbocharged Honda CBR250RR engine and boost the performance by redesigning the intake manifold - one of the key components of this engine package. The engine has been used in the past by the UTA Formula SAE team in several open-wheeled race cars providing a light weight platform with a high power to weight ratio. Previous intake manifolds did not provide balanced distribution of air flow among all cylinders. This lead to incorrect air/fuel ratios were some cylinders ran too lean at times, while others were running too rich. …
Numerical Investigation Of Steady State And Transient Thermal Performance Of A Multi-Chip Vapor Chamber, Mohammad Parhizi
Numerical Investigation Of Steady State And Transient Thermal Performance Of A Multi-Chip Vapor Chamber, Mohammad Parhizi
Mechanical and Aerospace Engineering Theses - Archive
Effective dissipation of heat generated in microelectronic devices during operation is critical for reliability and performance, particularly for advanced architectures such as microserver chips. Vapor chambers are a class of heat spreaders that have received much recent attention due to their passive nature and superior heat spreading capability. Several studies have investigated thermal performance of vapor chambers as heat spreading devices. However, developing a simple and accurate model which could be easily used in industry is still a big challenge. Moreover, more work needs to be done to optimize the performance of vapor chambers. For instance, developing a vapor chamber …
Developing A 7mmx7mm Qfn Package Using Liquid Crystal Polymer, Mitul H. Naik
Developing A 7mmx7mm Qfn Package Using Liquid Crystal Polymer, Mitul H. Naik
Mechanical and Aerospace Engineering Theses - Archive
Quad Flat No-Lead (QFN) packages are one of the most widely used and popular packages in the industry. The QFN packages gained popularity in the last decade because of its excellent electrical/thermal characteristics and lower costs. QFN packages are widely used in automotive, defense, handheld devices where space is a constraint and high current circuits require the package is mounted on thick printed circuit boards. This work makes an attempt to develop an economical 7mm*7mm QFN package using Liquid Crystal Polymer (LCP).The first challenge in this work investigate the different grades of LCP to match the electrical as well as …
Fluid-Crack Interaction In Hydraulic Fracturing, Harshil Vora
Fluid-Crack Interaction In Hydraulic Fracturing, Harshil Vora
Mechanical and Aerospace Engineering Theses - Archive
Hydraulic fracturing has been one of the major improvements in petroleum engineering in the past few decades. Since then this process has been used progressively and over million wells have been fracked using hydraulic fracturing technology. A thorough understanding of the formation of fracture network and its propagation is essential to keep evolving the technology. In the present study, the Linear Elastic Fracture Mechanics (LEFM) approach is applied to the crack propagation to understand the fluid crack interaction in brittle rocks under hydraulic loading. The boundary element method (BEM) is used to carry out the numerical analysis. Additionally, an explicit …
Design And Optimization Of Under Tray For Formula Sae Race Car Using Cfd Analysis, Girish Bangalore Jalappa
Design And Optimization Of Under Tray For Formula Sae Race Car Using Cfd Analysis, Girish Bangalore Jalappa
Mechanical and Aerospace Engineering Theses - Archive
With the advent of inverted wings to produce down-force in Formula-1 during the 1960's, aerodynamics has played a big role in increasing the vehicle performance. An aerodynamics system consists of front, rear wings and an under-tray. This thesis focuses on design of a new under-tray using CFD analysis for a Formula-SAE car.
Simulation Of Indeterminate Multiple, Simultaneous Impact And Contact For A Flexible Multibody System, Rohit Vijay Katti
Simulation Of Indeterminate Multiple, Simultaneous Impact And Contact For A Flexible Multibody System, Rohit Vijay Katti
Mechanical and Aerospace Engineering Theses - Archive
This work presents a method for understanding the impact behaviour of a flexible body undergoing multiple, simultaneous contacts. A continuous model is used with an event-driven function in MATLAB, which detects the collisions. The flexible body is defined as a system of particles, having inter-particle forces in terms of spring, damper coefficients. Equations of motion for such a Flexible MultiBody system are determined and then solved for different phases.In the method presented, the indeterminate nature of equations of motion encountered, during impact, and contact for flexible body are examined. Constraint forces are determined during the different phases of an impact …
Thermo-Mechanical Design Considerations At The Server And Rack Levels To Achieve Maximum Data Center Energy Efficiency, Richard Mark Eiland
Thermo-Mechanical Design Considerations At The Server And Rack Levels To Achieve Maximum Data Center Energy Efficiency, Richard Mark Eiland
Mechanical and Aerospace Engineering Dissertations - Archive
Continually increasing demand for information technology (IT) applications and services has provided sustained growth and interest in data centers. The large amounts of energy consumed by data center facilities have placed a significant emphasis on the energy efficiency of their overall operation. One area of particular importance is the cooling energy required. Heat generation within a data center starts at the server level, specifically within the microelectronic devices that process digital information. Convective heat transfer is the primary driver for the removal of heat from an individual server. As such, cooling efficiency at the server level will be dictated by …
Nanoscale Toughening Mechanisms Of Ultra High Temperature Novel Hfb2 Based Multiphase Ceramics, Zoher Shabbir Lavangia
Nanoscale Toughening Mechanisms Of Ultra High Temperature Novel Hfb2 Based Multiphase Ceramics, Zoher Shabbir Lavangia
Mechanical and Aerospace Engineering Theses - Archive
During return of spacecraft they endure very high temperatures (3000°F), few materials can withstand temperatures this high along with additional loads of the spacecraft. Reinforced carbon-carbon (RCC) material system is used as Thermal Protection System (TPS) which is made of laminated graphite rayon-phenolic epoxy, which need to sustain extreme heat. However, these materials are very prone to premature degradation due to oxidation. Silicon Carbide (SiC) and Hafnium Diboride (HfB2) are candidate materials for TPS but, they inherently lack the required toughness for such applications. This research is carried out in two stages, first is to study the individual properties of …
Minimizing Power Consumption At Module, Server And Rack-Levels Within A Data Center Through Design And Energy-Efficient Operation Of Dynamic Cooling Solutions, John Edwards Fernandes
Minimizing Power Consumption At Module, Server And Rack-Levels Within A Data Center Through Design And Energy-Efficient Operation Of Dynamic Cooling Solutions, John Edwards Fernandes
Mechanical and Aerospace Engineering Dissertations - Archive
Data center energy consumption continues to increase with the proliferation in online services such as social networking, banking, entertainment, cloud computing, etc. Recent estimates show that associated power consumption accounts for around 2% and 1.8% of electricity production in the United States and worldwide respectively. In addition to growth in the industry, power densities continue to rise in IT equipment increasing the criticality of thermal management in data center operation. Cooling systems account for around a third of overall power consumption requiring more energy-efficient solutions across all levels within the facility.Liquid cooling of high power modules using cold plates has …
Formalization Of The Engineering Science Discipline - Knowledge Engineering, Xiao Peng
Formalization Of The Engineering Science Discipline - Knowledge Engineering, Xiao Peng
Mechanical and Aerospace Engineering Dissertations - Archive
Knowledge is the most precious ingredient facilitating aerospace engineering research and product development activities. Currently, the most common knowledge retention methods are paper-based documents, such as reports, books and journals. However, those media have innate weaknesses. For example, four generations of flying wing aircraft (Horten, Northrop XB-35/YB-49, Boeing BWB and many others) were mostly developed in isolation. The subsequent engineers were not aware of the previous developments, because these projects were documented such which prevented the next generation of engineers to benefit from the previous lessons learned. In this manner, inefficient knowledge retention methods have become a primary obstacle for …
Aspects Of Intuitive Control Framework: Stabilize, Optimize, And Identify, Pavan Kumar Nuthi
Aspects Of Intuitive Control Framework: Stabilize, Optimize, And Identify, Pavan Kumar Nuthi
Mechanical and Aerospace Engineering Dissertations - Archive
The duality of estimation and control problems is a well known fact in control theory literature. Parameter convergence and closed loop stability are usually competing interests for a given control scheme. This motivates identification routines to be performed only in offline experiments. On the other hand stable controllers do not guarantee parameter convergence to true parameters. Thus there is a need for a higher level abstraction for a control scheme which acts in stages and prioritizes various aspects at different stages. The stage abstraction for controller is inspired by human intuition towards dealing with control and identification simultaneously and hence …
A Numerical Study Of Microfluidic Droplet Motions In Parallel-Plate Electrowetting-On-Dielectric (Ewod) Devices, Yin Guan
Mechanical and Aerospace Engineering Dissertations - Archive
Microscale water droplet motions in parallel-plate electrowetting-on-dielectric (EWOD) devices including transport, splitting, merging and dispensing have been numerically studied. The transient governing equations for the microfluidic flow are solved by a finite volume scheme with a two-step projection method on a fixed computational domain. The interface between liquid and gas is tracked by a coupled level set and volume-of-fluid (CLSVOF) method. A continuum surface force (CSF) model is employed to model the surface tension at the interface. Contact angle hysteresis which is an essential component in EWOD modeling is implemented together with a simplified model for the viscous stresses exerted …
Improving Fracture Toughness Of Silicon Carbide Based Ceramics By Microstructure Tailoring, Sheikh Fahad Ferdous
Improving Fracture Toughness Of Silicon Carbide Based Ceramics By Microstructure Tailoring, Sheikh Fahad Ferdous
Mechanical and Aerospace Engineering Dissertations - Archive
Ceramic materials are one of the most promising materials for wide variety of technical applications such as automotive, aerospace, medical, and other applications. They have very high strengths and high melting points relative to metals. However, low fracture toughness is one of the main barriers of ceramics prohibiting their wide-spread applications. This is because ceramics are mainly bonded with directional bonds which don’t allow dislocations based deformation. Several attempts have been made to increase the toughness of ceramic materials without sacrificing significantly the other mechanical properties. Here three different types of SiC based ceramics have been computationally (atomistic and up-scaled …
Novel Device And Methods For Composite Material Characterization, Michael M. Tadros
Novel Device And Methods For Composite Material Characterization, Michael M. Tadros
Mechanical and Aerospace Engineering Dissertations - Archive
Composite materials have several advantages over metallic materials, with their high specific strength and ability to be elastically tailored to create advantageous structural responses. However, the widespread implementation of composite materials in primary structures is limited by our knowledge of how damage mechanisms interact and spread inside composite parts. To date, characterization has been conducted using one of two methods, surface measurements and subsurface measurements. Surface measurements cannot in general capture the failure of multidirectional composite laminates. Subsurface measurements allow for observations of the internal material structure and damage mechanisms inside the composite which might facilitate greater understanding of the …
Computational Analysis Of I.T. Rack Under Vibration Load, Framroz Meheryar Bharucha
Computational Analysis Of I.T. Rack Under Vibration Load, Framroz Meheryar Bharucha
Mechanical and Aerospace Engineering Theses - Archive
Structural failure of a rack due to vibration could result in injury to people, damage to IT equipment, or interruption of services that depend on proper functioning of the IT and networking equipment in the rack. In this topic, a computational study of an IT rack and a group of racks placed adjacent to each other under three vibration load scenarios: transportation, office and earthquake vibration is presented.Each rack can weigh as much as 1600 kg (3500 lb.) when fully populated with IT equipment. Two standards commonly used for testing racks with synthetic seismic loads are the GR-63-CORE Network Equipment …
Performance Analysis Of A Helium Cooled Vhtr Powered Brayton Cycle Topping Unit On An Existing Steam Cycle Using Numerical Propulsion System Simulation, Warren Romao Caetano Freitas
Performance Analysis Of A Helium Cooled Vhtr Powered Brayton Cycle Topping Unit On An Existing Steam Cycle Using Numerical Propulsion System Simulation, Warren Romao Caetano Freitas
Mechanical and Aerospace Engineering Theses - Archive
With the decommissioning of ageing coal power plants due to outdated technology and high levels of air pollution, the advantages of overhauling existing infrastructure is twofold. First, by providing an alternate, sustainable fuel source, like nuclear power, the problem of air pollution can be brought to check. Second, utilizing existing steam plant infrastructure reduces initial investment costs and allows investors to keep the existing steam plant running until the new infrastructure is ready to go online.The focus of this research is to design and analyze the topping cycle required to support an existing 300 MW power plant based on the …
Quantifying Air Flow Rate Through A Server In An Operational Data Center And Assessing The Impact Of Using Theoretical Fan Curve, Neha Shigrekar
Quantifying Air Flow Rate Through A Server In An Operational Data Center And Assessing The Impact Of Using Theoretical Fan Curve, Neha Shigrekar
Mechanical and Aerospace Engineering Theses - Archive
Cooling is one of the major cost factors in data centres that accounts for 37% of the total data centre electricity consumption. Demands on cooling systems have increased substantially in recent years, due to increasing server densities. To avoid the overheating of servers, cooling aisles are over provisioned, but little attention is paid to the actual scenario at the server level. Cooling requirements of the servers is calculated on the basis of fan manufacturer’s published data for the air flow capacity of the server fan and system impedance data obtained from the server designer put together. Thus, the air flow …
Performance Characteristics Of Single Effect Lithium Bromide/ Water Absorption Chiller For Small Data Centers, Abhishek Arun Babu Mysore
Performance Characteristics Of Single Effect Lithium Bromide/ Water Absorption Chiller For Small Data Centers, Abhishek Arun Babu Mysore
Mechanical and Aerospace Engineering Theses - Archive
A medium data center consists of servers performing operations such as file sharing, collaboration and email. There are a large number of small and medium data centers across the world which consume more energy and are less efficient when compared to large data center facilities of companies such as GOOGLE, APPLE and FACEBOOK. Such companies are making their data center facilities more environmental friendly by employing renewable energy solutions such as wind and solar to power the data center or in data center cooling. This not only reduces the carbon footprint significantly but also decreases the costs incurred over a …
Chip Package Interaction Study To Analyze The Mechanical Integrity Of A 3-D Tsv Package, Pavan Rajmane
Chip Package Interaction Study To Analyze The Mechanical Integrity Of A 3-D Tsv Package, Pavan Rajmane
Mechanical and Aerospace Engineering Theses - Archive
The convergence and miniaturization of computing and communications dictates building up rather than out. As planar device miniaturization continues to its ultimate limits, the complexity of circuit interconnections for 2-D devices becomes a limitation for performance and drives up power dissipation [1]. As the consumers demand more functions on their hand-held electronic devices, the need for more devices such as memory, CPU and GPU in hand-held type footprints is increasing. Chip-stacking (3-D) is emerging as a powerful tool that satiates such IC package requirements. A 3-D FPGA would overcome the interconnect limitations, resulting in greater silicon efficiency per function (number …