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 20 of 21 for “"Feed-Forward Control"”.
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Valve characterization to implement feed-forward control of hydraulically actuated joints
… cycle. With a description of valve behavior, a feed-forward term can be implemented in the positional control loop of a hydraulically actuated robotic prototype. In order to isolate valve behavior, a test bed apparatus consisting of three separate hydraulic cylinders was constructed to decouple …
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An Open Loop Feed-Forward Control Scheme for Bioinspired Artificial Hair Cell Sensors
… documents the creation and use of an open-loop feed forward control scheme designed to manipulate the DC potential across lipid bilayer membranes in artificial hair cell sensors. Inspired by the human cochlea's non-linear gain phenomenon, whereby the cochlea can increase or decrease the …
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A New Approach to Wide Bandwidth Energy Harvesting for Piezoelectric Cantilever Based Harvesters
This thesis proposes a control system to widen the bandwidth of piezoelectric transducers (PZTs) for vibration energy harvesting while extracting maximum power. A straightforward complex conjugate match achieves maximum power transfer only at a single frequency while requiring an impractically …
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Unsteady surface heat flux and temperature measurements
… torch. One application is for development of feed-forward control systems in industrial processes with fast transients.
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Advanced sensing techniques for active structural acoustic control
… structures for active structural acoustic control (ASAC). Test structures studied in this work included a baffled simply supported beam and a baffled simply supported plate which were subjected to a harmonic input disturbance created physically with a shaker and modelled by a point force …
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Active control of sound radiation from fluid loaded plates
Active control of sound radiation due to subsonic wave scattering from an infinite or a finite fluid-loaded plate excited below the critical frequency is analytically studied. The disturbance is caused by a flexural wave in an infinite plate, or by a point force on a finite plate at subsonic …
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Adaptive-Optimal Control of Spacecraft near Asteroids
<p>Spacecraft dynamics and control in the vicinity of an asteroid is a challenging and exciting problem. Currently, trajectory tracking near asteroid requires extensive knowledge about the asteroid and constant human intervention to successfully plan and execute proximity operation. This work aims …
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Optimal rejection of nonstationary narrowband disturbances for flexible systems
… internal spacecraft instruments and reaction control actuators often act as sources of narrowband disturbances and impede the optimal performance of these precision systems. The fundamental objective of this work is the development of an active control methodology capable of rejecting …
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Wideband Active Vibration Control Synthesis and Implementation on Uncertain Resonant Structures
… they also incur significant challenges to control vibration. The construction that makes them strong, light, and ``rigid'' also makes them have very small inherent structural damping, and highly-complex modal structure. A myriad of control techniques have been developed to work on this …
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Estimating directed information to infer causal relationships between neural spike trains and approximating discrete probability distributions with causal dependence trees
… in terms of prediction, communication with feedback, source coding with feed forward, control over noisy channels, and other settings. It is also shown to be consistent with Granger's philosophical definition. The concepts of direct and indirect causation in a network of processes are …
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Fault Tolerant Control of Large Flexible Space Structures under Sensor and Actuator Failures
In this thesis, we study fault tolerant control (FTC) for the decentralized robust servomechanism problem (DRSP) of a colocated large flexible space structure (LFSS) under sensor and actuator failures (SAF). The control objective is to devise a decentralized controller that maintains the stability …
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Modeling of voltage source converter based HVDC transmission system in EMTP-RV
… in a power transmission system is the precise control of active and reactive power flow to maintain the system voltage stability. The VSC operating with the specified vector control strategy can perform independent control of active/reactive power at both ends. This ability of VSC makes it …
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Multi-Degree of Freedom Passive and Active Vibration Absorbers for the Control of Structural Vibration
… passive and active vibration absorbers for the control of structural vibration as an improvement to conventional single degree of freedom (SDOF) vibration absorbers. An analytical model is first used to compare passive two degree of freedom (2DOF) absorbers to SDOF absorbers using point …
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Gate design for injection molds
… The end use of the program will be in DOC feed-forward control applications for injection molding cycles. Several improvements can be made on this model. First, a more detailed analysis should yield a better relationship between the volumetric flow rate and the pressure at a given point. …
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Space Vector Modulation and Control of Multilevel Converters
… a multilevel converter. More on the side of the control of multilevel converters, the particular attention in this dissertation is paid to the problem of charge balance in the split dc-link capacitors of three-level neutral-point-clamped converters. It is a known fact that although the charge …
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Selective catalytic reduction: testing, numeric modeling, and control strategies
… which is troublesome when designing ammonia feed controllers. An experimental SCR test apparatus was installed on a Cooper Bessemer GMV-4 natural gas engine. Transient data was taken of commercially available SCR Catalysts. These transient tests are used to quantify SCR catalyst response. …
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Active Power Decoupling (APD) Converter for PV Microinverter Applications
… scheme, and circuit components, along with the control strategy, will enhance the efficiency, power density, reliability, and cost of the overall PV microinverter. This Ph.D. dissertation proposes an APD converter circuit suitable for PV microinverters, designed for optimized efficiency, power …
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Control System Design for a Solar Receiver-Reactor
… a key facet to this is the design of suitable control systems. The objective of this thesis was to describe a control system design methodology for a solar-thermal RR. A prototype RR currently being developed for application within a novel concentrated solar power (CSP) system is taken as the …
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Bi-Modal Excitation of a Supersonic Rectangular Jet
… aspect of this work focuses on the use of a feed-forward controller to control the actuation. Excitation studies have traditionally used open-loop control where only a single frequency is excited with an analytic function. There are very few published studies that have used real time sensing …
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