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Articles 1  16 of 16
FullText Articles in Mechanical Engineering
Motion Control Of An Open Container With Slosh Constraints, Kedar B. Karnik
Motion Control Of An Open Container With Slosh Constraints, Kedar B. Karnik
ETD Archive
General motion control of conveyor belts does not present difficulties. When the conveyor belt carries open containers filled with liquid, significant analysis needs to be carried out to design controllers. The objective of this thesis was to design a control system which will allow an open container filled with liquid to be transferred between two stations as fast as possible and without excessive slosh causing the liquid to spill out of the container. This control problem has applications to industrial processing facilities, where open containers are carried by a conveyor belt. The speed at which the open container can be ...
Health Monitoring Of Cracked Rotor Systems Using External Excitation Techniques, Adam C. Wróblewski
Health Monitoring Of Cracked Rotor Systems Using External Excitation Techniques, Adam C. Wróblewski
ETD Archive
Cracked rotors present a significant safety and loss hazard in nearly every application of modern turbomachinery. This thesis focuses on the health monitoring, modeling, and analysis of machines with transverse breathing cracks, which open and close due to the selfweight of the rotor. After considering the modeling of cracked rotors, the thesis investigates an active structural health monitoring approach, focusing on the application of an active magnetic actuator to apply a specially designed external force excitation to the rotating shaft. Extensive experimental data has been collected and analyzed utilizing advanced diagnostic techniques. The presented results demonstrate that the use of ...
Radiation View Factors Between A Disk And The Interior Of A Class Of Axisymmetric Bodies Including Converging Diverging Rocket Nozzles, Mark Richard Murad
Radiation View Factors Between A Disk And The Interior Of A Class Of Axisymmetric Bodies Including Converging Diverging Rocket Nozzles, Mark Richard Murad
ETD Archive
A general symbolic exact analytic solution is developed for the radiation view factors including shadowing by the throat between a divergence thin gas disk between the combustion chamber and the beginning of the rocket nozzle radiating energy to the interior downstream of the nozzle contour for a class of coaxial axisymmetric converging diverging rocket nozzles. The radiation view factors presented in this thesis for the projection which are blocked or shadowed through the throat radiating downstream to the contour have never been presented before in the literature. It was found that the curvature of the function of the contour of ...
Application Of Reverse Engineering And Rapid Prototyping To Casting, Venkat Deepak Kolar
Application Of Reverse Engineering And Rapid Prototyping To Casting, Venkat Deepak Kolar
ETD Archive
The automotive industry has an increasing need for the re manufacturing of spare parts through reverse engineering. In this thesis we will review the techniques used in Fused Deposition Modeling system for the reverse engineering of vintage automotive parts. The objective of the project is to be able to generate parttoCAD and CADtopart reconstruction of the original part for future usage. These newly created 3D models will be added to the 3D Part Database. The integration of reverse engineering and rapid prototyping is being used for getting product to the market quickly by resolving a longstanding conflict between design and ...
Probabilistic Finite Element Heat Transfer And Structural Analysis Of A ConeCylinder Pressure Vessel, Omar Haddad
Probabilistic Finite Element Heat Transfer And Structural Analysis Of A ConeCylinder Pressure Vessel, Omar Haddad
ETD Archive
Stress analysis of a conecylinder pressure vessel was computationally simulated by a finite element method and probabilistically evaluated in view of the several uncertainties in the performance parameters. Cumulative distribution functions and sensitivity factors were computed for overall Von Mises stresses due to the structural and thermodynamic random variables. These results can be used to quickly identify the most critical design variables in order to optimize the design and make it cost effective. The analysis leads to the selection of the appropriate measurements to be used in structural and heat transfer analysis and to the identification of both the most ...
Effect Of Axial Oscillation On Performance Of Hydrodynamic Journal Bearings, Thomas Wirsing
Effect Of Axial Oscillation On Performance Of Hydrodynamic Journal Bearings, Thomas Wirsing
ETD Archive
The hydrodynamic coefficients of a journal bearing set with the bearing subjected to axial oscillation are determined in this work. The NavierStokes equations were used to account for the axial component of the relative motion between the journal and the bearing. Numerical solution of the NavierStokes equations yielded the pressure distribution within the cavity of the bearing. This pressure distribution was then integrated over the surface of the bearing to obtain the two orthogonal force components. The derivatives of these force components were then taken with respect to the displacement and velocity of the journal that are colinear with these ...
Modeling Of Transient Thrust Of A Two Phase Propellant Tank, Karthik Mellechervu
Modeling Of Transient Thrust Of A Two Phase Propellant Tank, Karthik Mellechervu
ETD Archive
This thesis develops a model to predict various timevarying quantities associated with the evacuation of a pressurized container through a nozzle. The container is part of a satellite propulsion prototype used to study attitude control. Variables of interest include the thrust and mass of fluid in the tank as functions of time. A mathematical model based on transient expressions for mass and energy conservation is derived for a twophase system representative of the conditions of the fluid inside the tank
Multiplexed Control Of Smart Structure Using Piezoelectric Actuators, Kumar S. Nale
Multiplexed Control Of Smart Structure Using Piezoelectric Actuators, Kumar S. Nale
ETD Archive
Active control of smart structures containing a large number of actuators and sensors presents a tradeoff between increased system performance and the cost and bulk of the required hardware and computational resources. A technique called multiplexed control offers advantages when software and hardware resources are scarce and performance specifications call for a large number of actuators and sensors. In structural control applications, in particular those using smart materials, it is often desirable to increase the number of actuators to enhance controllability.The focus of this research is to demonstrate realtime multiplexing on the hardware side of the actively controlled structure ...
Damage Detection Of Rotors Using Magnetic Force Actuator: Analysis And Experimental Verification, Alexander Hans Pesch
Damage Detection Of Rotors Using Magnetic Force Actuator: Analysis And Experimental Verification, Alexander Hans Pesch
ETD Archive
The ability to monitor the structural health of rotordynamic systems is becoming increasingly important as critical components continue to be used despite aging and the associated potential for damage accumulation. The aim of this thesis is to investigate a novel structural health monitoring approach for the detection of damage in rotating shafts, which utilizes a magnetic force actuator for applying multiple types of force inputs on to a rotating structure for analysis of resulting outputs. The magnetic actuator will be used in conjunction with conventional support bearings and also be applied to rotor under full magnetic levitation. The results of ...
Development Of Effective Balancing Procedure For Ct Scanner, Jeremy David Pettinato
Development Of Effective Balancing Procedure For Ct Scanner, Jeremy David Pettinato
ETD Archive
Since the beginning of medical organizations, engineering departments have introduced new innovative ideas and designs to advance image quality. In the case of a CT scanner, one of the largest and most cost effective ways to achieve superior image quality is through a well balanced rotating array. The focus of this thesis is the development of a balancing procedure which will effectively balance a CT scanner rotating array. Rigid rotor (dynamic) balancing techniques are utilized in order to balance the Philips CT scanner rotor. Upon completion of the dynamic balancing of the CT scanner rotor a new an innovative way ...
A Kinematics Based Tolerance Analysis Of Mechanisms, Shahrbanoo Biabnavi Farkhondeh
A Kinematics Based Tolerance Analysis Of Mechanisms, Shahrbanoo Biabnavi Farkhondeh
ETD Archive
A kinematic based tolerance analysis of mechanisms is presented in this thesis. It is shown that standard kinematic analysis can be used for obtaining closedform explicit formulations for tolerance analysis of mechanisms. It is proposed that the manufacturing tolerances are accounted for by incorporating fictitious sliding members in the rigid links, thereby allowing them to either "grow" or "shrink" along the lines of their pin connections. The virtual expansions or contractions of these fictitious sliders are captured in the kinematic equations by taking the differentials of the magnitudes of the vectors that define the length of rigid links having dimensional ...
Experimental Test And Cost Analysis Of Residential Solar Water Heaters, Sai Mahesh Dharanikota
Experimental Test And Cost Analysis Of Residential Solar Water Heaters, Sai Mahesh Dharanikota
ETD Archive
Non renewable energy sources have been diminishing in the recent times.Renewable energy is abundant in nature, but the use of it is very low.Lowering the energy consumption and using renewable energy, thereby decreasing the use of fossil fuels and nuclear energy would have a positive impact on our environment. The use of solar energy as an alternate resource is discussed in this research. The solar water heater is tested for its recovery rates, under normal solar radiation in static testing. The effect of solar radiation in increasing the temperature of water is studied and discussed. The solar water ...
Road Surface Condition Detection And Identification And Vehicle AntiSkid Control, Maosheng Ye
Road Surface Condition Detection And Identification And Vehicle AntiSkid Control, Maosheng Ye
ETD Archive
Road surface condition is greatly dependent on the surface's friction coefficient. The abrupt change of the coefficient results in variation of wheel slip which likely leads to vehicle instability. Vehicle steering model and the dynamic equations for fourwheel drive vehicle is developed. A new observer, called Extended State Observer (ESO) is used to estimate the longitudinal velocity, lateral velocity and yaw rate, and more importantly an additional quantity known as system dynamics. A trained neural network was employed to help determine the friction coefficient. Fuzzy logic was employed to quickly detect the change of road surface condition and further ...
Effect Of Adding A Regenerator To Kornhauser's Mit "TwoSpace" Test Rig, Praveen Gidugu
Effect Of Adding A Regenerator To Kornhauser's Mit "TwoSpace" Test Rig, Praveen Gidugu
ETD Archive
A 3space solution domain (gas spring + heat exchanger + regenerator) is adapted from the 2space solution domain (gas spring + heat exchanger) in Kornhauser MIT test rig [25] by modifying the heat exchanger space to include a porous regenerator system. A thermal nonequilibrium porousmedia model is employed for the regenerator. Extensive numerical simulations of the fluid flow and heat transfer phenomena under conditions of oscillating pressure and oscillating fluid flow inside the 3space solution domain were performed using 1D Sage and 2D Fluent numerical codes. 3space results of temperature, pressure and surface heat transfer variations, pressurevolume diagrams, energy conservation and thermodynamic losses ...
Experimental Testing And Performance Analysis Of "Room Air Cleaners", Pavan Kumar Mudiya
Experimental Testing And Performance Analysis Of "Room Air Cleaners", Pavan Kumar Mudiya
ETD Archive
HMI industries are the manufacture of the air cleaners and vacuum cleaners, in which a solution is adapted for the current model of the volute to the new design of the volute in order to calculate the "Clean Air Delivery rate" and qualify for the "Energy Star requirements". For the above model to be employed as a Energy Star certificate, a test rig was made in which "air velocity" and "flow rate" was calculated for the three different air cleaners in two cases i.e. (i) three different air cleaners with different filters and different rpm's (ii) three different ...
Mathematical Analysis Of A Geothermal System, Ivan P. Erceg
Mathematical Analysis Of A Geothermal System, Ivan P. Erceg
ETD Archive
The issue being examined is to design a more economical and efficient therefore superior geothermal system than currently in use in industry. Current geothermal systems are designed and built 300 feet into the ground. After researching ground temperature gradients for Ohio we found out that below 10 feet of depth, the temperature varies by 1 degree Fahrenheit per 100 feet depth. Our goal is to utilize the heat as close to the surface as possible and greatly reduce the need to dig so deeply into the ground. The procedure used to go about designing a superior geothermal system is to ...