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 44 for “"Coupled Dynamics"”.
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Coupled dynamics and economic analysis of floating wind turbine systems
… of 30 - 300 meters. A tool for performing a coupled structural, hydrodynamic, and aerodynamic analysis of floating wind turbine systems in the frequency domain was developed and is presented. This analysis tool includes the effects of the gyroscopic loads of the wind turbine rotor on the …
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Distributed adaptive control methods for uncertain multiagent systems with coupled dynamics
… the presence of not only uncertainties but also coupled dynamics. Another challenge for these systems is designing distributed adaptive controllers with user-assigned positions in this case and defining the convergence rate of the reference model for each agent using only local (i.e., …
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The nonlinear coupled dynamics of fluids and spacecraft in low gravity
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1987.
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Coupled dynamics of above- and below-ground interactions in the critical zone
… while maintaining a balance between the natural dynamics and anthropogenic modifications. In this study I have developed a predictive understanding of the above- and below-ground interactions that occur in the CZ in the light of different dynamics involving water, carbon, nitrogen, energy, and …
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Coupled Dynamics in the Cislunar Region and Spacecraft Attitude Prediction in a Higher-Fidelity Model
… thesis advances the state of the art in astrodynamics by modeling all bodies in the problem as rigid bodies, allowing for spacecraft orientation to be propagated and considered. Two models are under consideration—the circular restricted full three-body problem (CRF3BP) and a full …
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Investigating synergy: Mathematical models for the coupled dynamics of HIV and HSV-2 and other endemic diseases
… mosquitoes in a malaria study. Each of the three coupled disease models addresses different epidemiological questions with regard to gender or disease structure in the context of sexually-transmitted diseases (STDs), while the malaria model focuses on age-structure of the human population. ^ …
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Stability Limits of Uncertain Systems in the Presence of Unmatched Coupled Dynamics and Actuator Dynamics with Adaptive Architectures
<p>Uncertain systems with coupled dynamics and actuator dynamics are prevalent in various applications spanning private, commercial, and government sectors. While stabilization and command tracking strategies exist, they often rely on idealized assumptions, such as negligible actuator bandwidth …
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The fluid-coupled motion of micro and nanoscale cantilevers
An understanding of the fluid coupled dynamics of micro and nanotechnology has the potential to yield significant advances yet many open and interesting questions remain. As an important example we consider the coupling of two closely spaced cantilevers immersed in a viscous fluid subject to an …
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Multiple Uncertain Robot Manipulator Control for a Modular System
… terms, robot-based uncertainties, as well as coupled dynamics. This thesis also provides extensive Lyapunov stability analysis and simulation results of the designed controller case by case. Specifically, control design of the modular system is shown in the absence of anomalies (i.e., …
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L1 adaptive control augmentation system for the X-48B Aircraft
… flight envelope in the presence of significantly coupled dynamics and control surface failures.
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A coupled, two-phase fluid-sediment material model and mixture theory implemented using the material point method
… point method (MPM) to accurately model the coupled dynamics of the combined system. Qualitative results show the breadth of problems, which this model can address. Quantitative results demonstrate the accuracy of this model as compared with analytical models and experimental observations.
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HIGH-FIDELITY MODELING AND PHYSICS OF BIO-INSPIRED MORPHING AND FLAPPING WINGS
… the exploration of the role of flexibility in coupled dynamics. To predict the fully-coupled fluid-flexible multibody structure system, a partitioned body-fitted formulation based on the coupling of an incompressible unsteady viscous fluid solver and a flexible multibody structure solver is …
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Classical and quantum control in nanosystems
… many interesting phenomena arising from the coupled dynamics of electron and nuclear spins. In addition, I will present some results on the control of superconducting flux qubits, obtained in collaboration with the Orlando group at MIT. The control techniques discussed in this thesis may help …
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Nonlinear Dynamics Analysis and Control of Space Vehicles with Flexible Structures
… the nonlinear rotational and vibrational dynamics of these flexible structures. Formulation and analysis of these flexible structures must account for the rigid-flexible coupling present in the system dynamics for stability analysis and control design. The system model is represented by a …
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A two-dimensional fluid-structure coupling algorithm for the interaction of high-speed flows with open shells
… tools to accurately describe the strongly coupled dynamics of the interactions between a light structure and a flow surrounding it. Specific examples include inflatable structures and parachutes used as deceleration devices during planet entry. In this work, an algorithm for simulating the …
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Nonlinear Control of Underactuated and Constrained Systems
… are implemented to generate well-defined system dynamics for a multitude of scenarios. These dynamics are shown to lie on manifolds defined by mathematical restrictions, allowing for singularity-free modeling for global considerations. Feed-back controllers by extension share these benefits, …
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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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Real-time identification of an unmanned quadcopter flight dynamics using fully tuned radial basis function network
… aerial vehicle (UAV) with nonlinear and strongly coupled dynamics system. A precise dynamics model is important for developing a robust controller for a quadcopter. NN model capable to obtain the accurate dynamics model from actual data without having any govemmg mathematical model or priori …
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Nonlinear Electro-Thermal Transport in Metallic Carbon Nanotubes
… and backward carrier populations mutually coupled through interactions. In particular, we show that: (i) in the presence of elastic backscattering the Wiedemann-Franz law is restricted to each branch with its specific temperature and that (ii) the thermoelectric power vanishes due to …
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