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 22 for “"Extremum seeking"”.
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Extremum-Seeking Control of Industrial-Scale Fermentation Processes
The work presented here is based on two papers, both pertaining to perturbation-based control strategies in industrial fed-batch fermentation processes. The first paper describes a new control strategy for avoiding overflow metabolism in the exponential growth phase of a fermentation, based on …
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Extremum seeking control of battery powered vapor compression systems for vehicles
… vehicle cooling. This thesis proposes the use of extremum seeking control (ESC), a class of real-time model-free optimization algorithms, to determine the optimal combination of system inputs that minimizes the VCS power consumption while meeting given objectives. In order to determine algorithm …
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Automated Regulation of LiDAR Detection Range with Model-Guided Extremum Seeking Control
… LiDAR detection range through a model-guided extremum seeking control (ESC) against the variation of ambient conditions. A neural network model is trained with experimental LiDAR data off-line to simulate the impact of ambient conditions, and an Environmental Index (EI) is proposed to classify …
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Integration of Extremum Seeking and Model Predictive Control for Discrete Time Systems
This thesis considers a time-varying extremum seeking control algorithm that adjusts set-points provided to a model predictive controller for a vapour compression system. While perturbation-based extremum seeking methods have been known for some time, they suffer from slow convergence rates---a …
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Enhancing heat pump efficiency using extremum seeking control: A MATLAB SimScape-based study
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-05-01
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Model free real-time optimization for vapor compression systems
… This thesis focuses on one such approach, extremum seeking control, which uses performance index measurements to determine optimal system settings. Forgoing system model knowledge and relying exclusively on data allows an optimization approach to function well on many different plants. …
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Control of an indoor autonomous mobile communications relay via antenna diversity
… of the end-to-end communications channel. An extremum-seeking controller steers the quadrotor while collision avoidance is provided by artificial potential fields. Extremum-seeking is model-free adaptive control method; it's applicable in situations where there is a nonlinearity in the control …
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Control and Estimation Algorithms for Multiple-Agent Systems
… mobile sensor networks, the perturbation-based extremum seeking algorithm has been modified and extended. It has been assumed that the integrator gain and the perturbation amplitude are time varying (decreasing in time with a proper rate) and that the output is corrupted with measurement noise. …
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Distributed Newton-Seeking for Resource Allocation
… this issue, model-free techniques such as Extremum-seeking control (ESC) have been developed that can accomplish the RTO task in the absence of any knowledge of the process dynamics and of the objective function. Using this optimization methodology, this thesis develops an approach to solve …
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Real-time trajectory optimization for excavators by power maximization
… real-time optimization, which used methods from extremum seeking control, was implemented in simulation and then on a small scale simulation rig which validated the method. It was shown that power maximization as a strategy of trajectory adaptation for excavation was both well-grounded and …
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Electric Machine Differential For Vehicle Traction Control And Stability Control
… fault within one electrical cycle. The EMD based extremum seeking slip optimization algorithm reduces stopping distance by 30% compared to hydraulic braking based ABS.</p>
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Analysis of Model-Free Control of Wind Farms Using Large-Eddy Simulations
… The control strategies are based on extremum-seeking control (ESC), a real-time gradient-based optimization algorithm. Either the turbine generator torque or the rotor yaw angle is used as the control parameter tuned by ESC to optimize the wind farm power production. The generator …
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Cloud-Based Model Predictive Control: Establishing a Fully Distributed Architecture for Nonlinear MPC
… optimization approach. Distributed time-varying extremum-seeking, a form of model-free optimal control, is integrated to a conventional MPC scheme to solve the optimization problem at each time step. Each of the control horizon’s inputs is assigned to an agent that shares its local cost …
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Methods for Control in Robotic Excavation
… as a signal for adaptive excavation. Using an extremum-seeking algorithm, an optimal excavation depth that maximizes the output power of the machine is sought. Secondly we tackle terrain shaping, where the objective is creating a final desired site shape. Here, more precise control of the …
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
… configurations of cold-climate ASHP, by use of Extremum Seeking Control (ESC). By utilizing periodic dither inputs for online gradient estimation, ESC bears significant robustness against process variation and external disturbance, which has proved to be more advantageous in handling the …
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Characterization and Control of Multi-Cylinder Partially Premixed Combustion
… consumption optimization can be developed. An extremum seeking control algorithm was applied. The results show that the controller manages to find the maximum brake torque region both with and without external excitation. Finally, the estimation error in accumulated fuel consumption from the …
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Shockless explosion combustion - Controlled autoignition in stratified mixtures for pressure gain combustion
… observations are subsequently used to apply an extremum seeking control algorithm which controls the cycle–averaged formation of different autoignition modes by optimizing the fuel injection profile. Optical and pressure measurements reveal a complex interaction between heat release and pressure …
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Power System Frequency Control and Stability Analysis With Increasing Renewable Energy Penetration Level
… Therefore, the dynamic droop mechanism and Extremum Seeking based secondary control are proposed and implemented for Virtual Synchronous Generator to improve its stability margin as well as eliminating steady-state error after power system disturbances.</p> <p>Furthermore, since relatively …
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Direct Torque Control for Silicon Carbide Motor Drives
… adaptive high frequency signal injection based extremum seeking control (ESC) algorithm is proposed to determine the optimal reference flux in real-time, leading to a maximum torque per ampere (MTPA) like approach for DTC drives. The stability analysis and key parameters selection for the …
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Control design and energy optimisation of a buoyant airborne wind turbine
… is then addressed through the formulation of an Extremum seeking control (ESC) scheme which derives an optimal altitude for the system. This altitude is determined by trading off generated power from the rotor against power losses incurred by reeling the tether in/out at high wind speeds. …
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