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Applying and analyzing robust modern control on uncertain hydraulic systems
(University of Missouri--Columbia, 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 ...
Modeling, design and control of forced-feedback metering poppet valve system
(University of Missouri--Columbia, 2006)
This research explores valve design, dynamic modeling, and techniques to achieve flow control for a forced-feedback metering poppet valve system. In particular, nonlinear and linear models of a forced feedback configuration ...
Effect of chip thickness, sub-critical bifurcations and process parameters in high-speed milling
(University of Missouri--Columbia, 2010)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The main focus of the current research is to experimentally and numerically investigate of subcritical bifurcations in milling accounting for actual ...
Effects of machining system parameters and dynamics on quality of high-speed milling
(University of Missouri--Columbia, 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 ...
Modern control design for a variable displacement hydraulic pump
(University of Missouri--Columbia, 2006)
In this work modern control methods are used to design and analyze control methods for a variable-displacement hydraulic pump. More accurate uncertainty descriptions are derived by using a structured uncertainty model as ...
Nonlinear control and active damping of a forced-feedback metering poppet valve
(University of Missouri--Columbia, 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 ...
Force control of a hydraulic servo system
(University of Missouri--Columbia, 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 ...
Developing and automating time delay system stability analysis of dynamic systems using the Matrix Lambert W (MLW) function method
(University of Missouri--Columbia, 2009)
Stability analysis of time-delayed (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 ...
Design optimization and efficiency modeling of a hot gas vane motor
(University of Missouri--Columbia, 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 ...
Modeling and control of arterial oxygen saturation in premature infants
(University of Missouri--Columbia, 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, ...
Chatter detection and prevention in high-speed milling
(University of Missouri--Columbia, 2011)
In this work, two separate mathematical models, a traditional and new model, are presented for an end-milling 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 H-infinity synthesis and performance specifications from best clinical practice
(University of Missouri--Columbia, 2013)
This work details the development of a novel control system for regulating the Arterial Hemoglobin saturation (SpO2) of premature infants. An H-infinity synthesis method was used to derive multiple controllers to cover a ...
Work cycle efficiency for a hydrostatic machine
(University of Missouri--Columbia, 2015)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] If the hydraulic Pump and motor are connected together through hydraulic hoses, the system is called a hydrostatic transmission or a hydrostatic drive. ...
A method of frequency domain error modeling to predict the probability of stability and performance of dynamic systems with parametric uncertainty
(University of Missouri--Columbia, 2012)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] In this work a method is developed for modeling frequency domain error in dynamic systems with parametric uncertainty. Within any mass-manufactured ...
Modeling, simulation, and stability of a hydraulic load-sensing pump system with investigation of a hard nonlinearity in the pump displacement control system
(University of Missouri--Columbia, 2014)
Certain types of Load-Sensing (LS) pumps utilize a hydro-mechanical control system designed to regulate the pressure difference, or margin pressure, between the inlet and outlet of a flow control valve. With a constant ...
Robust control design for a proportional valve with backlash compensation
(University of Missouri--Columbia, 2013)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] 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 ...
Kalman filter design for real-time estimation of modal parameters and cutting force coefficients for determining the dynamic stability of high-speed low-radial-immersion milling processes
(University of Missouri--Columbia, 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 ...
New tool design for measuring tool displacement in milling
(University of Missouri--Columbia, 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 ...
Hydraulic efficiency of a hydrostatic transmission with a variable displacement pump and motor
(University of Missouri--Columbia, 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 ...
Estimation of model states for a hydraulic valve system using an extended Kalman filter
(University of Missouri--Columbia, 2017)
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Pilot valves are considered as one of most common types of valves in the industry today. They are widely-used because their design is simple, they are ...