Browsing Mechanical and Aerospace Engineering electronic theses and dissertations (MU) by Thesis Advisor "Fales, Roger"
Now showing items 118 of 18

Applying and analyzing robust modern control on uncertain hydraulic systems
(University of MissouriColumbia, 2006)In this work modern robust control systems are designed and compared to standard techniques for a hydraulic implement system. The system includes an independent metering valve (IMV) and a variable displacement pump. The ... 
Chatter detection and prevention in highspeed milling
(University of MissouriColumbia, 2011)In this work, two separate mathematical models, a traditional and new model, are presented for an endmilling process. The traditional model assumes circular tool motion, while the new model accounts for trochoidal tool ... 
Control of arterial hemoglobin saturation in premature infants using Hinfinity synthesis and performance specifications from best clinical practice
(University of MissouriColumbia, 2013)This work details the development of a novel control system for regulating the Arterial Hemoglobin saturation (SpO2) of premature infants. An Hinfinity synthesis method was used to derive multiple controllers to cover a ... 
Design optimization and efficiency modeling of a hot gas vane motor
(University of MissouriColumbia, 2007)The purpose of this research is to model and analyze the dynamics of a hot gas vane motor for design optimization work. The pneumatic motor is a portable direct drive actuator that is intended as an alternative to ... 
Developing and automating time delay system stability analysis of dynamic systems using the Matrix Lambert W (MLW) function method
(University of MissouriColumbia, 2009)Stability analysis of timedelayed (TD) systems is not easy to conduct since the addition of delays within a dynamic model results in irrational system equations. Traditional TD analysis methods involve adding approximations ... 
Effect of chip thickness, subcritical bifurcations and process parameters in highspeed milling
(University of MissouriColumbia, 2010)The main focus of the current research is to experimentally and numerically investigate of subcritical bifurcations in milling accounting for actual motion of the tool. In this work, a new approach for predicting the ... 
Effects of machining system parameters and dynamics on quality of highspeed milling
(University of MissouriColumbia, 2013)This dissertation outlines research on studying the effects of machining parameters such that cutting speed, feed rate, axial depth of cut, radial depth of cut and helix angle on system dynamic stability and the surface ... 
Force control of a hydraulic servo system
(University of MissouriColumbia, 2009)The objective of this thesis is to model a hydraulic servo system using force control and then improve upon the performance of the model/system through feedback control design. The hydraulic system is first constructed and ... 
Hydraulic efficiency of a hydrostatic transmission with a variable displacement pump and motor
(University of MissouriColumbia, 2012)Pumps and motors are commonly connected hydraulically to create hydrostatic drives, also known as hydrostatic transmissions. A typical hydrostatic transmission consists of a variable displacement pump and a fixed displacement ... 
Kalman filter design for realtime estimation of modal parameters and cutting force coefficients for determining the dynamic stability of highspeed lowradialimmersion milling processes
([University of MissouriColumbia], 2014)Chatter is a particularly severe and damaging form of tool vibration that can occur in milling processes under certain combinations of spindle speed and axial depth of cut. The ability to predict the onset of chatter in a ... 
A method of frequency domain error modeling to predict the probability of stability and performance of dynamic systems with parametric uncertainty
(University of MissouriColumbia, 2012)In this work a method is developed for modeling frequency domain error in dynamic systems with parametric uncertainty. Within any massmanufactured dynamic system, parameters such as masses, springs or geometrical attributes ... 
Modeling and control of arterial oxygen saturation in premature infants
(University of MissouriColumbia, 2011)In this work modeling and control of neonatal infant's blood oxygen saturation (SpO2) is investigated. Through analyzing the biological system, it was shown that the blood is oxygenated through the mechanisms of ventilation, ... 
Modeling, design and control of forcedfeedback metering poppet valve system
(University of MissouriColumbia, 2006)This research explores valve design, dynamic modeling, and techniques to achieve flow control for a forcedfeedback metering poppet valve system. In particular, nonlinear and linear models of a forced feedback configuration ... 
Modeling, simulation, and stability of a hydraulic loadsensing pump system with investigation of a hard nonlinearity in the pump displacement control system
(University of MissouriColumbia[University of MissouriColumbia], 2014)Certain types of LoadSensing (LS) pumps utilize a hydromechanical control system designed to regulate the pressure difference, or margin pressure, between the inlet and outlet of a flow control valve. With a constant ... 
Modern control design for a variable displacement hydraulic pump
(University of MissouriColumbia, 2006)In this work modern control methods are used to design and analyze control methods for a variabledisplacement hydraulic pump. More accurate uncertainty descriptions are derived by using a structured uncertainty model as ... 
New tool design for measuring tool displacement in milling
(University of MissouriColumbia, 2012)Monitoring tool displacement during a milling process allows the operator to identify when there is relative movement between the cutting tool and the workpiece. When the relative movement between the cutting tool and the ... 
Nonlinear control and active damping of a forcedfeedback metering poppet valve
(University of MissouriColumbia, 2007)For a metering poppet valve which was developed at the University of Missouri (MU valve), the valve can be configured for performance at the cost of stability. It is desirable to achieve both performance and stability using ... 
Robust control design for a proportional valve with backlash compensation
(University of MissouriColumbia, 2013)In this work, a linear technique is used to study the stability of a nonlinear system. Most of dynamic systems in industrial and fluid power systems are nonlinear and include uncertainties. Thus, unexpected changes in the ...