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 47 for “"single-loop"”.
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State Feedback Control of a Single-Loop Thermosyphon System Via a Quotient Controller
… controller to stabilize a chaotic flow in a single loop thermosyphon system with a high heat index. The thermosyphon loop is heated from below and cooled from above, which causes time-dependent chaotic flow when the external heat index is above a threshold value. Our goal was to stabilize the …
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Issues in Frequency Domain Feedback Control Theory (Robustness, Sensitivity, Systems, Multi-Variable)
… of feedback control systems. Properties of both single loop and multiple loop systems are considered. For single loop systems the limitations on feedback properties imposed by right half plane poles and zeros of the plant are considered. The relation between open and closed loop properties of …
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Memory latency reduction via data prefetching and data forwarding in shared memory multiprocessors
… for large, numerical application codes with loop-level and vector parallelism. Data prefetching is applied to these applications using two different multiprocessor prefetching algorithms implemented within a parallelizing compiler. Data forwarding considers array references involved in …
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Design, Modeling and Testing of a Cascaded Heading Stabilization Controller for a Cruciform Parachute System
… the parachute heading compared to the existing single-loop PID controller. This approach to controller design permits rapid deployment of cruciform systems of varying type and scale suited to specific operational requirements.
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Tools for Autonomous Process Control
… The focus is on autonomy on the local control loop level. A list of desired functionality for an autonomous single loop controller is presented. This list consists of methods for initialization, assessment of basic process features, selection and tuning of on-line controller, monitoring of the …
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Ortho-Planar Mechanisms for Microelectromechanical Systems
… space. The method is first developed for single loop planar folded mechanisms with revolute joints, and later extended to mechanisms with prismatic joints and to spherical folded mechanisms. Functions which assign a value to each point in design space can be used to describe classes of …
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Quantized multiplicative quiver varieties and actions of higher genus braid groups
… remains conjectural. When Q consists of a single vertex of dimension N with a single loop, the algebra Dq(MatA(Q)) is isomorphic to the algebra of quantum differential operators on G = GLN. In this case, for any n E Z>o, we construct a functor from the category of Dq-modules to …
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The Use of Organizational Learning Feedback Loops in the Practice of Planning: Citizen Participation and Virginia's Urban Development Area Comprehensive Plan Requirement
… find the presence of limited learning systems (single loop planning) and limited modal learning occurring within the Commonwealth of Virginia\'s local jurisdictions, directly affecting completion of legislative mandates. Recommendations suggest modification of existing communal planning …
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Parity-Time Symmetry in Lasers and Optoelectronic Oscillators
… gain, loss, and coupling coefficients for single-mode selection in lasers and optoelectronic oscillators (OEOs). This thesis focuses on the use of PT symmetry for mode selection in fiber ring lasers and OEOs. Five PT-symmetric architectures are proposed and experimentally demonstrated in …
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An Investigation of Multivariate Process Control for Biomanufacturing
… manufacturing is primarily managed through single loop univariate or cascaded controls - technology that has not fundamentally changed in decades. Outside of biomanufacturing, process control technologies have advanced to include multivariate and predictive control. This project examines the …
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Radiofrequency losses in an NMR surface coil
… to a phantom load. These were studied using single-loop, resonant surface coils. Coil Q values, both unloaded and loaded, were measured and used to determine the coil radiation resistance, load resistance, B, field magnitude, and SNR. Radiation resistance is shown to increase like RR ~ f04. …
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Development of hierarchical optimal control algorithms for interconnected nonlinear dynamical systems
… are then implemented using two techniques, the single loop and the double loop techniques. All the algorithms are implemented in software and a simulation study is carried out using two examples to investigate their effectiveness and convergence properties.. The optimality of the solution …
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A measurement of the magnetic field systematic correction to the muon anomalous magnetic moment associated with muon phase space in experiment BNL E821
… a direct experimental determination of the single loop weak renormalization with 23 percent resolution, and will place more stringent constraints on extensions to the Standard Model. To measure the muon anomaly, polarized muons are injected into a magnetic storage ring and decay into …
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mKdV Loop Travelling Waves and Interactions of Loop Solitons
… This study focuses on mKdV curve motions called loop solutions. One class arises from soliton, heavy-tail (rational), and periodic solutions of the mKdV equation. These loop solutions exhibit intriguing symmetrical shapes: the soliton and heavy-tail cases describe a single loop which is open, and …
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Model predictive control for terminal area energy management and approach and landing for a reusable launch vehicle
… guidance and control originated with a single loop multivariable control scheme using time-invariant linear quadratic regulator theory. The research has since evolved into the use of model predictive control theory. The main focus of this thesis is the theory and design of model …
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Event-Based Control and Estimation with Stochastic Disturbances
… motivated by certain bottlenecks in the control loop. Two kinds of implementation constraints are considered: closing one or several control loops over a data network, and sensors that report measurements only as intervals (e.g. with quantization). The proposed strategies depend critically on …
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Exploring Social Learning in Yorkton Following the 2010, 2014 and 2016 Floods
… learning. However, this learning has been mainly single-loop learning, with some indicators exhibiting double loop learning. While the data revealed no explicit barriers to social learning, the perception that the public cannot contribute to stormwater management issues may have inhibited the …
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Dynamic performance of control loops and their interactions in a VAV HVAC system
… out. This research will focus on local control loop interactions and operating strategies for VAV control systems. To reach this objective, experiments were conducted in a two-zone VAV test facility. The facility consists of six control loops (cooling valve, fan speed, two dampers, two electric …
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Mathematical algorithms for optimisation of large scale systems
… of the double iterative algorithm over that of single loop method in considerably reducing the number of times that information is required from the real process and hence saving on-line computing time. It is hoped that this work will provide useful information for implementing and furthur …
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