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 28 for “"dynamic coupling"”.
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Dynamic coupling of multiple structures through soil
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1988.
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Dynamic coupling of the stratosphere with the troposphere and sudden stratospheric warmings.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1972.
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SPECTROSCOPIC STUDIES OF NUCLEAR SPINS POLARIZED VIA SPIN EXCHANGE OPTICAL PUMPING AND DYNAMIC COUPLING IN CRYPTOPHANE HOST-GUEST COMPLEXES
… to perform detailed studies of structure and dynamics of molecules in solution. However, despite NMR's excellent spectral sensitivity, most NMR methods suffer from low detection sensitivity. This low detection sensitivity results largely from extremely small (Boltzmann) nuclear spin …
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Design and control optimization for high-speed jumping mode Atomic Force Microscope
… sample scanner has been designed to address the dynamic coupling, thermal expansion and range issues in the previous design. Improvements to the optical beam deflection system, photodiode circuit, signal conditioning circuit and cantilever probe holder with actuators have been implemented. The …
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Systematic Prediction and Parametric Characterization of Thermo-Acoustic Instabilities in Premixed Gas Turbine Combustors
… in a system-level model to reflect their natural dynamic coupling and assessed with linear stability criteria. The results include the empirical validation of each of the component models and limited validation of the total closed-loop model with a lean premixed gaseous fuel combustor not …
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Dynamic control of aerodynamic forces on a moving platform using active flow control
… unsteady interaction between trailing edge aerodynamic flow control and airfoil motion in pitch and plunge is investigated in wind tunnel experiments using a two degree-of-freedom traverse which enables application of time-dependent external torque and forces by servo motors. The global …
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Coupling of a multizone airflow simulation program with computational fluid dynamics for indoor environmental analysis
… approaches that apply Computational Fluid Dynamics (CFD). Each has certain advantages and shortfalls in terms of indoor airflow simulation. A coupling approach that combines multizone airflow analysis and detailed CFD airflow modeling would provide complementary information of a building …
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A unified method to predict pilot-induced oscillations
A pilot-induced oscillation (PIO) is a dynamic coupling between pilot and aircraft that produces undesired oscillations as a result of attempted pilot control of the vehicle. Present day methods that are intended to predict which aircraft are susceptible to PIO deal primarily with the linear …
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Fabry-Perot Observations of Midlatitude Neutral Winds and Atmospheric Gravity Wave Activity
… and lower thermosphere displays a wide range of dynamical phenomena resulting in a complex and variable regions. Governed primarily by fluid dynamics, the motion of the upper atmosphere is modulated by a number of atmospheric waves propagating upward from various sources in the lower atmosphere. …
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Advanced Modelling of Helicopter Nonlinear Dynamics and Aerodynamics
The work presented here provides a comprehensive dynamic and aerodynamic helicopter model. The possible applications of this work are wide including, control systems applications, reference and trajectory tracking methods implementation amongst others. The model configuration corresponds to a …
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The evolutionary emergence of neural organisation in computational models of primitive organisms
… bearing on neural architecture, neural dynamics and motor symmetry. The second major finding is that sensory feedback strengthens the dynamic coupling between the neural system and the body plan morphology, resulting in minimal neural circuitry yet more ecient agent behaviour. The third …
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Numerical Simulations of the Aeroelastic Response of an Actively Controlled Flexible Wing
… wing, and controller as elements of a single dynamical system. The method is very modular, allowing independent modifications to the aerodynamic, structural, or control subsystems and it is not restricted to periodic motions or simple geometries. To illustrate the technique, we use a High …
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Perception and Control Methods for Improving the Autonomy of Off-Road Robots
… of its robotic manipulator is complicated by the dynamic coupling with the suspension. Based on Lyapunov’s stability theory, this thesis contributes RaPID, a tuning procedure for the PID control of suspended manipulators that guarantees the stability of the system. The algorithm applies to any …
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Theoretical and Experimental Investigation of Free-Floating Space Manipulator Motion Control Using Reinforcement Learning
… Learning. This problem is caused by dynamic coupling between the spacecraft and robotic manipulator, which significantly affects control and precision in the space environment. This research addresses critical requirements for efficient and effective manipulation in space, including …
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Faults as episodic conduits for hydrocarbons, CO2 and groundwater in sandstones
Constraining the dynamic feedback between deforming porous media and fluid is crucial for understanding hydrocarbon reservoirs, CO2 storage sites and other evolving porous media. In particular, predicting complex fault architecture at depth, currently relies on deterministic algorithms, that do not …
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'Amplifying' the NMR signatures of host-guest interactions and molecular structure using liquid-crystalline matrices and polarization enhancement of nuclear spins
… used to investigate the structure and dynamics of host-guest systems. NMR spectroscopy has gained attention because of its high spectral information content for studies of molecules in the solid state and in solution. However, the main weakness of NMR is the inherent low detection …
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Broadband acoustic characterization of the deep scattering layer
… habitat, complex biological composition, and dynamic coupling with ocean physics. This thesis leverages long-term broadband acoustic observations and signal processing methods to characterize the DSL from the individual to the population level, with the goal of improving biomass estimates and …
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Unpacking the role of complexity in multi-class models of the tumor microenvironment
… with complex ABMs, especially in cases with the dynamic coupling between agents and their environment. I highlight a review article discussing both the growing popularity and the resulting challenges of combining modeling paradigms. I then present work leveraging ma- chine learning techniques to …
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Dynamics of biopolymers and their hydration water studied by neutron and X-ray scattering
Protein functions are intimately related to their dynamics. Moreover, protein hydration water is believed to have significant influence on the dynamics of proteins. One of the evidence is that both protein and its hydration water have the same dynamic transition temperature at around 220 K. This …
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Numerical Modeling of Synthetic Jets in Quiescent Air with Moving Boundary Conditions
… moving through fluids. Particularly, in aerodynamics there are many potential benefits for implementing synthetic jets to achieve aircraft designs with less moving parts, uper- maneuverability, and separation control for fuel economy. Piezoelectric synthetic jets are of special interest …
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