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 24 for “"plant dynamics"”.
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On-line Computer Analysis of Plant Dynamics
… aim of this thesis is to show how an industrial plant may be identified under normal operating conditions using pseudo random binary signals. Particular reference is made to a pilot plant scale double effect evaporator. Classical methods for system identification are briefly considered with their …
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Soil-plant dynamics of water, nitrogen and sulfur: A study on indigenous and exotic tree species in Munessa Forest, Ethiopia
Forest plantations are necessary to counteract the destruction of tropical montane forests. Sustainable forestry requires comprehensive knowledge of tree effects on site conditions and nutrient cycling, but substantial information is lacking even for widely-planted species. In my work, I aimed at …
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Adaptive Control Methods for Non-Linear Self-Excited Systems
Self-excited systems are open loop unstable plants having a nonlinearity that prevents an exponentially increasing time response. The resulting limit cycle is induced by any slight disturbance that causes the response of the system to grow to the saturation level of the nonlinearity. Because there …
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Design and implimentation of a supervisory safety controller for a 3DOF helicopter
… which uses a real-time simulation of linearized plant dynamics with a feedback law to ensure the system's safety. We describe the development of the system model, the design and implementation of the supervisory safety controller, integration of the safety controller as part of a remote …
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Design and Control Considerations for a Skid-to-Turn Unmanned Aerial Vehicle
… noise, loop failures and changes within the plant dynamics. This research shows how it is possible for a winged UAV to easily maneuver using wings level skid turns.
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Optimized Thruster Allocation Utilizing Dual Quaternions for the Asteroid Sample Return Mission (OSIRIS-REx)
… Bennu, with a focus on utilizing dual quaternion dynamics and a newly developed thruster allocation method. The dual quaternion based dynamics are chosen in order to demonstrate its feasibility in real-time applications. Contrary to typical plant dynamics, which decouple the spacecraft orbit and …
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Control of AFMs in contact mode
… analyzed. Challenges due to surface variations, plant dynamics, and contact nonlinearity are presented. The closed loop response of AFM systems in single actuator as well as in dual actuator configurations is evaluated. The emphasis is on the underlying structure corresponding to each …
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Approximate dynamic programming solutions with a single network adaptive critic for a class of nonlinear systems
… for optimal control. In the second paper, the plant dynamics with parametric uncertainties or unmodeled nonlinearities has been considered. The author discusses the dynamic re-optimization of the J-SNAC controller that is used to capture the uncertainty but is not considered in the system model …
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Flexible Scheduling Methods and Tools for Real-Time Control Systems
… network transmissions and the continuous-time plant dynamics. Using TrueTime it is possible to study the effects of CPU and network scheduling on control performance and to experiment with flexible scheduling techniques and compensation schemes. A general overview of the simulator is given and …
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Optimal trajectory-shaping with sensitivity and covariance techniques
… of the deterministic states and controls in the plant dynamics, so classical design methods do not directly address trajectory robustness in the presence of system uncertainties. This work explores the introduction of uncertainty directly into the trajectory design process. The state transition …
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Adaptive Control for a Class of Nonlinear, Time Varying Rotational Systems
… systems often exhibit nonlinear, time varying dynamics. Expansive mission profiles, fuel burn or transfer and payload deployments or slung loads can supply additional complexity that can excite the plant dynamics and result in undesirable performance. Because of these often unknown dynamical …
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The Role of Temperature and Precipitation on Thrips Populations in Relation to the Epidemiology of Tomato Spotted Wilt Virus.
… adult flight or delaying senescence of host plants. Additional models explained 60%, 74%, 68% and 69% of the variation in the number of dispersing F. fusca captured during 1 ? 15 April, 16 ? 30 April, 1 ? 15 May and 16 ? 31 May, respectively. Validation resulted in weak correlations of …
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A pneumatic semi-active control methodology for vibration control of air spring based suspension systems
… extensive analysis and investigation of the plant dynamics is performed. A dynamic plant model is developed and tuned to experimental data. The plant model is then used in the design of a semi-active control system. A detailed description of the model tuning procedure is provided.</p> …
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Nonlinear system identification and control using a neural network approach
In this thesis, the plant identification, state estimation based on the identified plant and also the design of a neuro-controller using multi-layer perceptrons (MLPs) for a complex system are presented. The quasi-linear system to be controlled is both unstable and nonlinear. The complete nonlinear …
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Improved continuous-time higher harmonic control using H [infinity] methods
… of periodicity in the helicopter rotor dynamics for control synthesis. Based on the analysis of wind tunnel data and simulation results, we conclude the helicopter rotor can be modeled reasonably well as linear and time-invariant for control design purposes. Modeling the helicopter rotor …
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A comparative analysis of plant response parameters : to the Los Angeles aqueduct systems in the Mojave Desert, California
… aqueduct, and what is the intensity of damage to plant cover. The recovery rates for vegetation reestablishment is another interesting area, with great heuristic value.</p> <p>This study intended to discover the quantitative and qualitative relationship of the construction of the 1913 and 1970 Los …
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Dual-axis tilting quadrotor aircraft: Dynamic modelling and control of dual-axis tilting quadrotor aircraft
… engineering project, the focus of this work is plant model identification and control solution of the proposed aircraft design. A higher-level setpoint tracking control loop designs a generalized plant input (net forces and torques) to act on the vehicle. An allocation rule then distributes that …
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Hybrid adaptive control using the inverse system
… scheme for controlling linear time-invariant plants is considered. The scheme is then extended to the adaptive control of time-varying plants by incorporating periodical identification of the plant dynamics and updating its inverse. The algorithm used here is a computer-oriented adaptation of …
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Control design and energy optimisation of a buoyant airborne wind turbine
… results in a detailed understanding of the BAWT plant model through the introduction of two force ratio's relating the buoyancy contribution to the aerodynamic contribution on system loads across the operating envelope. The model development is then expanded on to discuss the question of system …
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