Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 21 for “"closed loop feedback control"”.
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Electromechanical design of a body weight support system for a therapeutic robot for rodent studies
… support system prototype. In addition, a closed loop feedback control system was designed, simulated, constructed and tested. Hardware limitations were identified, and alternative control techniques were explored.
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pH control in a miniaturized bioreactor
… current miniaturized design lacks a method of pH control. Without pH control, cell growth can be hindered or even stopped altogether when the growing medium becomes too acidic. Using technology already in place to optically measure the pH inside the reactor in conjunction with a valve and a …
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Optimal pursuit/evasion spacecraft trajectories in the hill reference frame
… propulsion. The thrust-pointing direction is the control for each spacecraft. Each vehicle has a finite specific impulse and therefore the mass of each vehicle decreases as propellant is consumed. Optimal closed-loop controllers were also sought, but due to the nature of the minimax problem, …
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Emissions reduction benefits of adapting electronic closed loop fueling control on a mechanically controlled spark-ignited engine
… gas emissions produced from a mechanically-controlled Lycoming IO-360-B GA engine and studies the benefits of conversion to electronic fuel injection with closed loop feedback control. The study concludes that the overall gaseous exhaust emissions from the unmodified engine far exceed …
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Control for an optically powered firing set using miniature photovoltaic arrays
… firing set, the output voltage state needs to be controlled and the temperature of the MPA and illuminating source minimized. This thesis reports on the development of an optical firing set model that represents the electrical, optical, and thermal characteristics of the system. A closed loop …
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A LabVIEW program to obtain the initiating component of a vergence eye movement in an open-loop experiment
… preprogrammed initiating component and a slow feedback-controlled sustaining component. The initiating component is described with open-loop control and the sustaining component is described as a closed-loop feedback control system. Previously, several languages have been utilized to develop …
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Minimally invasive assessment of lymphatic pumping pressure using near infrared imaging
… several ways. The system defined here utilizes closed-loop feedback control of pressure application at smaller, more precise intervals. Using this device, a significant difference in lymphatic vessel pumping pressure was detected between a control case and a treatment case in which a vasoactive …
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Study of Active Vibration Control using the Method of Receptances
… points along the rod. Using the sensor data, closed loop feedback control gains can be calculated by solving a simple set of linear equations. The feedback gains can be applied to generate the required control force using an actuator. This partial pole assignment can be done without continuous …
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Hardware model of a shipboard generator
… computer software to implement speed and voltage control; and an input-output interface board that passes measurement and controller signals to and from the software environment. A numerical Simulink model of the GTG is developed that provides speed response to a change in electrical loading. The …
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Field oriented control of permanent magnet synchronous motor with third-harmonic injection pulse width modulation to reduce quadrotors’ speed ripples
… of autonomy as enabled by the use and precise control of motors. Traditional Direct Current (DC) motors are replaced by permanent magnet synchronous motors (PMSM) associated with the new power electronic inverters. Because of a PMSM’s higher power density than a DC motor, it reduces the rotor …
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Microtransfer printing of elastomeric active composites
… place micro-transfer printing experiments with closed-loop feedback control. However, such a flexible, active composite membrane’s uses can also be extended to other avenues like flexible sensor technologies. Towards this end, the PZT embedded elastomer was evaluated as a vibrational energy …
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Design and implementation of a piezoelectric servo-flap actuation system for helicopter rotor individual blade control
A novel new actuator for helicopter rotor control, the X-Frame Actuator, was developed, demonstrating superior performance for applications requiring compact, fast acting, large stroke actuation. The detailed experimental characterization of this actuator is described, including bench-top output …
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On temperature measurements and analysis in electron beam additive manufacturing using near infrared thermography
… before process models can be validated and closed-loop feedback control systems can be developed. Knowledge of the cooling rates experienced by the part during fabrication is also essential for the development of predictive microstructure models. In this study, a near-infrared (NIR) thermal …
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Building and controlling fluidically actuated soft robots : from open loop to model-based control
This thesis describes the creation and control of soft robots made of deformable elastomer materials and powered by fluidics. We embed soft fluidic actuators into self-contained soft robotic systems, such as fish for underwater exploration or soft arms for dynamic manipulation. We present models …
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Developing a global observer programming model for large-scale networks of autonomic systems
… programme, and Autonomic Computing, where a closed-loop feedback control model is essential to delivering the advocated cognitive immunity and self-management capabilities. While much research work has been conducted on vanous aspects of SRS and autonomy, they are typically based on the …
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A control system viewpoint for manipulating heat equation and maximum entropy principle for design of experiments
… properties of a one-dimensional rod through feedback control methods. In the second part of this work, we consider an unrelated problem of the design of experiments with imputable features. In particular, in the first part of this work, we use the central difference method and basis function …
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Feedback Control of Ionic Polymer Actuators
… of the hydration of the polymer. Difficulties in controlling the hydration, which changes with respect to time, results in inconsistencies in the mechanical response exhibited by the polymers during continual usage. Several physical models of ionic polymer actuators have been proposed. The …
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Advancing Kinematic Control from Rigid Robots to Dynamic Bio-Inspired Systems for Adaptive Behaviours
… bio-inspired systems are far more difficult to control due to complex kinematics and dynamics. While various control strategies exist, closed-loop kinematic control offers the advantage of implicitly managing quasi-static dynamic internal and external forces. This thesis presents a conceptual …
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Sensor-based Characterization and Control of Additive Biomanufacturing Processes
… by lack of integrated process monitoring and control strategies. This dissertation aims to address the compelling need to incorporate sensing and control with Bio-AM processes, which are currently open-loop processes and improve the scalability and reliability of additively biomanufactured …
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Adaptive control of coherent soft X-rays
… potential of this new tool it is necessary to control the coherent soft x-ray spectra and to enhance the efficiency of conversion from laser light to the soft x-ray region in the harmonic-generation process. This work developed a comprehensive approach towards the optimization of the harmonic …
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