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 10 of 10 for “"wind disturbance"”.
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The effects of intermediate-scale wind disturbance on forest composition, structure, and succession with implications for management
Forest disturbances are discrete events in space and time that disrupt the biophysical environment and impart lasting legacies on forest composition, structure, and stand development. Intermediate-scale disturbances may promote stand heterogeneity, including uneven-aged structure, and their effects …
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Impacts of multiple fires and wind disturbance on forest community composition, succession and diversity in the Boundary Waters Canoe Area Wilderness.
… expected to see an increase in the frequency of disturbances including wildfires and severe windstorms. While boreal forests such as those of the BWCAW are generally considered disturbance adapted, it is uncertain how changing disturbance regimes will impact these forests. We used a series of …
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Performance and Robustness Assessment for a Robust Port-Hamiltonian Flight Controller
… flight, measurement noise, model mismatch, wind, and discretization with time delay were implemented in a collection of simulation studies to understand which disturbances the novel control law was most sensitive to. Due to the non-additive nature and magnitude of the applied disturbances, …
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Collocation Method and Model Predictive Control for Accurate Landing of a Mars EDL vehicle
… is a function of the end time state. A 3-sigma wind disturbance model is introduced to the system, as a function of the altitude, which introduces uncertainties to the system, resulting in a final state deviating from the targeted location. The trajectory is split into two parts, for better …
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Development of a feedback controller for the Antenna Positioner on the MeerKAT Radio Telescope
… model defined with parametric uncertainty. Wind disturbance plays a significant role in the pointing performance of the antenna. Therefore, focus is then placed on developing an appropriate wind model to represent the on-site wind characteristics and the relationship to the drive-axis …
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Effects of an intermediate-scale wind event on forest composition, structure, and structural complexity
Forest disturbances alter environmental conditions, influence species composition and stand structure, and affect successional and developmental pathways. Natural disturbances differ in magnitude, severity, and return interval and range from frequent, gap-scale disturbances, to infrequent …
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Brachiating power line inspection robot: controller design and implementation
… it to be robust to environmental factors such as wind disturbance and uncertainty in joint friction over time. The resulting robust control system was able to compensate for uncertain system parameters and reject disturbances in simulation. An online trajectory generator (OTG), inspired by …
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Improved gust rejection for a micro coaxial helicopter in urban environments
… areas are notoriously complex with the mean winds varying spatially and temporally with sharp changes in wind magnitude and direction over small distances. This results in velocity perturbations which are on the same order of magnitude as the maximum flight speeds of micro rotorcraft leading …
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Ion-neutral coupling in the geomagnetically disturbed mid-latitude ionosphere as observed by SuperDARN HF radars and NATION Fabry-Perot Interferometers
… resource for measuring the thermospheric neutral winds. The overlap of these two observing networks in the mid-east North American sector has resulted in a strong ground-based large-scale platform for co-located study of mid-latitude thermosphere-ionosphere dynamics for the first time. The …
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Linear Control of Unmanned Aerial Vehicles
… unmanned aerial vehicles (UAVs) operating in windy conditions, covering the complete process from raw data-driven model development to advanced control design and experimental validation. The study begins by introducing a control-oriented system identification methodology aimed at achieving …