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.
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Showing 1 to 14 of 14 for “"Actuator Control"”.
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An Open Architecture for Versatile Machine and Actuator Control
<p>Automatic control technology increases usability, reliability and productivity in manufacturing, transportation, and climate control. There are many additional areas of modern life that could benefit through automatic control; however, current automation components are too expensive or aren't …
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An Autonomous Underwater Vehicle for Validating Internal Actuator Control Strategies
There are benefits to the use of internal actuators for rotational maneuvers of small-scale underwater vehicles. Internal actuators are protected from the outside environment by the external pressure hull and will not disturb the surrounding environment during inspection tasks. Additionally, …
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Model-based feedforward-feedback control for real-time hybrid simulation of large-scale structures
… In RTHS, computation, communication, and actuator limitations cause delays and lags which lead to inaccuracies and potential instabilities. At the same time, the phenomenon of control-structure interaction (CSI) leads to a coupling of the dynamic behavior of the actuators and the …
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System Integration and Attitude Control of a Low-Cost Spacecraft Attitude Dynamics Simulator
… and acts as a testbed for spacecraft attitude control system development and demonstration. Prior to this thesis, the simulator platform and several subsystems had been designed and manufactured, but the total simulator system was not yet capable of closed-loop attitude control. Previous …
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Modification of a Full Scale Personal Hovercraft to Support Research in Dynamics and Control
… The hovercraft, initially designed for manual control by a rider, was modified both physically and with software to allow for remote and autonomous operation. The design leverages the actuator control solutions that are already implemented on the hovercraft for ease of installation and control. …
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Coherent control of hyperfine-coupled electron and nuclear spins for quantum information processing
… nuclear spins with the ability to initialize, control, and measure the electron spin state, the favorable properties of each spin species are utilized. This thesis discusses a procedure to initialize these nuclear spin qubits, and presents a vision of how these systems could be used as the …
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The Control of Interior Cabin Noise Due to a Turbulent Boundary Layer Noise Excitation Using Smart Foam Elements
In this work, the potential for a smart foam actuator in controlling interior cabin noise due to a turbulent boundary layer excitation has been experimentally demonstrated. A smart foam actuator is a device comprised of sound absorbing foam with an embedded distributed piezoelectric layer (PVDF) …
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Active noise control of supersonic impinging jet using pulsed microjets
This thesis concerns an active noise control of supersonic impinging jet flow using unsteady microjet injection. Supersonic impinging jet involves several problems such as lift loss, ground erosion, significant noise pollution, and sonic fatigue, all of which are dominated by impinging tones mainly …
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Miniature, high-speed imaging transform spectrometers and advanced sampling algorithms
… systems. Small linear Lorentz force voice coil actuators, fast piezoelectric actuators, flexures, and miniature precision position and tip-tilt measurement systems are implemented and characterized. Feedback, feedforward, and high speed hybrid-actuator control systems are also used for fast step …
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Analysis on actuator dynamics in active wheelsetcontrol
… evaluate the applicability and requirements of actuators in the implementation of active solid–axle wheelset control systems, for primary suspensions of the railway vehicles, and the effects of actuator dynamics on the overall active control system. The research is focused on the use of …
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Robust Control Methods for Nonlinear Systems with Uncertain Dynamics and Unknown Control Direction
<p>Robust nonlinear control design strategies using sliding mode control (SMC) and integral SMC (ISMC) are developed, which are capable of achieving reliable and accurate tracking control for systems containing dynamic uncertainty, unmodeled disturbances, and actuator anomalies that result in an …
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Robust Hybrid Simulation with Improved Fidelity: Theory, Methodology and Implementation
Civil engineers of today have been charged with the task of providing resilient and sustainable infrastructure designs, and to use those for establishing resilient communities. To achieve this mission, improved designs, new materials, and efficient retrofit strategies are being introduced around …
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Regenerative electric actuators for active control of civil structures
… utility power source which supply energy to the actuator in an active control system is usually not reliable. With a regenerative electric actuator, recovered energy can be used to reduce the peak oscillations of the structure by applying forces (through actuators which use the recovered energy) …
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Application of Co-Design Principles for Design of Series Elastic Joints
… into robotic joints is the use of Series Elastic Actuators (SEAs). Designing SEAs, however, requires balancing the stiffness of the elastic element with the structure and gains of the control system, as both strongly influence actuator bandwidth, disturbance rejection, and overall efficiency. …