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 17 of 17 for “"Adaptive Feedback"”.
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Adaptive feedback technique for unmodeled disturbance rejection
… control technique that blends traditional fixed feedback control with adaptive feedback techniques. The objective is to provide damping for transient disturbances via the fixed controller and rejection of steady disturbances via the adaptive controller. This technique differs from other control …
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High-speed dynamic partial reconfiguration for field programmable gate arrays
… the Hard IP PowerPC440 on Virtex-5 capable of adaptive feedback. The adaptive feedback Virtex-5 system can use internal voltage and temperature measurements from the Xilinx System Monitor IP to dynamically increase or decrease the speed of reconfiguration and/or change other reconfigurable …
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Adaptive Control Methods for Non-Linear Self-Excited Systems
… the closed loop. This work examines a variety of adaptive control approaches for controlling a thermoacoustic instability, a physical self-excited system. Initially, a static feedback controller loopshaping design and associated system identification method is presented. This design approach is …
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Engineering an adaptive and socially- aware feedback acquisition.
Self-adaptive software systems are characterised by their ability to monitor changes in their dynamic environment and react to these changes when needed. Adaptation is driven by these changes in the internal state of the system and its external environment. Social Adaptation is a kind of adaptation …
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Adaptive Control using IIR Lattice Filters
This work is a study of a hybrid adaptive controller that blends fixed feedback control and adaptive feedback control techniques. This type of adaptive controller removes the requirement that information about the disturbance is known apriori. Additionally, the control structure is implemented in …
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A comparison study of genetic algorithms in feedback controller design
… algorithms are used to design a two-state feedback optimal gain set for a SDOF SMD model with a given initial condition. An improved selection scheme called the stochastic remainder selection without replacement is introduced. An improved GA-based (IGA) feedback controller is designed to …
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Direct numerical simulation of microjets for turbulent boundary layer control
… were still insufficient. Instead, a real-time, adaptive feedback method was selected to calibrate the strength of the actuators. The feedback method was first tested by itself to verify that the numerical approach used here was capable of implementing such control. The feedback method was then …
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Control of nonlinear systems using Sugeno fuzzy approximators
… fuzzy-logic gain scheduling-like controller. Adaptive-neuro-fuzzy inference system was used to construct the rules for the fuzzy gain schedule. This will guarantee the continuous change in the gains as the system parameters change in time or space. This procedure is systematic and can be used …
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Design and Analysis of an Active Noise Canceling Headrest
… sound fields. Multichannel feedforward and feedback control architectures are implemented in real-time and it is shown that adaptive feedback systems are capable of attenuating band-limited disturbances. The spatial attenuation pattern surrounding the head is also measured by shifting the …
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Output feedback adaptive control in the presence of unmodeled dynamics
This thesis outlines a method of output feedback adaptive control in the presence of matched unmodeled dynamics, uncertain control effectiveness and matched parametric uncertainties. An adaptive feedback controller that augments an assumed existing observer based linear controller is developed. The …
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Modeling Student Software Testing Processes: Attitudes, Behaviors, Interventions, and Their Effects
… automated grading system, we developed an adaptive feedback system to provide customized incentives to reinforce incremental testing behaviors while students solved programming assignments. We investigated how students react to concrete testing goals and hint reward mechanisms and found …
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Adaptive Collocated Feedback for Noise Absorption in Acoustic Enclosures
This thesis focuses on adaptive feedback control for low frequency acoustic energy absorption in acoustic enclosures. The specific application chosen for this work is the reduction of high interior sound pressure levels (SPL) experienced during launch within launch vehicle payload fairings. Two …
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Adaptive control for enhanced performance of devices and algorithms
… of this dissertation is to explore the use of adaptive feedback control algorithms in control-based continuation of periodic solutions of a priori unknown dynamical systems under continuous variations in system parameters, independently of their stability. The control-based continuation …
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Improving Performance of Byzantine State Machine Replication through Self-Adaptation
… First, how BFT SMR systems can be made self-adaptive, enabling them to dynamically optimize their configuration and behavior in response to changing environments and workloads. Second, how such dynamic optimizations can be efficiently and systematically evaluated to assess their effectiveness …
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Verifiable Adaptive Control Solutions for Flight Control Applications
… approach taken in this dissertation is the L1 adaptive control, which is elaborated from its design perspective for output feedback solution and is extended to time-varying reference systems to support augmentation of gain-scheduled baseline controllers. Compared to conventional adaptive …
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Turning Up the Heat!: Using Fault-Localizing Heat Maps to Help Students Improve Their Code
Automated grading systems provide feedback to computer science students in a variety of ways, but often focus on incorrect program behaviors. These tools will provide indications of test case failures or runtime errors, but without debugging skills, students often become frus- trated when they …
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Adaptive control of coherent soft X-rays
… molecular or lattice vibrational dynamics with adaptively shaped femtosecond laser pulses these days, it will now be feasible to perform real-time manipulation of tightly bound electron motion with adaptively shaped attosecond light fields. The last part of this work demonstrated the capability …