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 “"Energy optimal"”.
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Energy-optimal information transmission over wireless channels
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, September 2001.
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An energy optimal power supply for digital circuits
The energy efficiency of digital circuits continues to be a major factor in determining the size and weight of battery-operated electronics. Integration of more functionality in a single system has made battery longevity a major problem. Operating circuits at their minimum energy operating voltage …
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Multi-fidelity Modeling and Reinforcement Learning for Energy Optimal Planning
Modeling the energy consumption of a quadrotor involves complex electrical and physical dynamics, making it difficult to optimize over. We present a sequence-to-sequence multi-fidelity Gaussian process (MFGP) to learn a data-driven model to predict the energy required to fly a given vehicle …
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Energy optimal path planning using stochastic dynamically orthogonal level set equations
… such important requirement is optimization of energy required for undertaking missions that will enable longer endurance and lower operational costs. Our goal in this thesis is to develop a computationally efficient, and rigorous methodology that can predict energy-optimal paths from among all …
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Novel energy-optimal solutions to the inverse kinematics problem of redundant manipulators
… in the last decades. Historically, the energy of the manipulator has been considered a particularly important optimisation cost function: it is relevant in industrial settings, where manipulators operations are a standing cost, and even more in field environments, such as space, where …
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Energy-time optimal path planning in strong dynamic flows
… equation-based methodology that predicts time-energy optimal paths for autonomous vehicles navigating in dynamic environments. The differential equations solve the multi-objective optimization problem of navigating a vehicle autonomously in a dynamic flow field to any destination with the goal …
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Probabilistic regional ocean predictions : stochastic fields and optimal planning
… and allow long-duration measurements, the energy consumption of ocean observing platforms need to be optimized. Predicting the distributions of reachable regions, time-optimal paths, and risk-optimal paths in uncertain, strong and dynamic flows is also essential for their optimal and safe …
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Towards basin-scale in-situ characterization of sea-ice using an Autonomous Underwater Glider
… to limit localization error, and a set of energy-optimal propulsive and hotel policies that react to evolving environmental conditions to improve AUG endurance. These methods are evaluated with respect to laboratory experiments and preliminary field data, and future Arctic sea-ice survey …
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Time-optimal path planning in uncertain flow fields using stochastic dynamically orthogonal level set equations
… first review existing path-planning work: time-optimal path planning using the level set method, and energy-optimal path planning using stochastic DO level set equations. We build on these methods by treating the velocity field as a stochastic variable and deriving new stochastic DO level set …
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Integration of Extremum Seeking and Model Predictive Control for Discrete Time Systems
… of measured and unmeasured disturbances, the optimal compressor discharge temperature set-point must vary according to these conditions. We show that the energy optimal discharge temperature is tracked with the time-varying extremum seeking algorithm in the presence of disturbances.
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Design, modelling and control of a brachiating power line inspection robot
… These models were then used in the generation of optimal trajectories, using nonlinear optimisation techniques, for brachiating past line hardware. A physical robot was designed and manufactured to validate the brachiation manoeuvre. The robot was designed following classic mechanical design …
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Path planning and position control and of an underactued [sic] electromagnetic formation flight satellite system in the near field
… from contraction analysis. Finally time and energy optimal paths for a series of maneuvers are conceived by application of the GPOPS - II numerical optimization software. The results show further that the underactuated system is capable of arbitrary position control with the limitation being …
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Optimal and on-board near-optimal midcourse guidance
Optimal midcourse guidance is examined for an air-to-air missile featuring boost-coast-sustain propulsion. A vertical plane, point-mass model is studied with load factor as a control variable. Time-range-energy optimal trajectories are computed, open-loop, via the usual necessary conditions and a …
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Evaluation of software energy consumption on microprocessors
In the area of wireless communications, energy consumption is the key design consideration. Significant effort has been placed in optimizing hardware for energy efficiency, while relatively less emphasis has been placed on software energy reduction. For overall energy efficiency reduction of system …
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Optimal Control in Aircraft Trajectory Planning
… performance objectives. This thesis investigates optimal control as a refinement tool for trajectory-planning problems that are typically addressed using geometric or search-based methods. Two case studies are considered. The first addresses loss-of-thrust contingency landing for a fixed-wing …
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Ultra-low-power circuits and systems for wearable and implantable medical devices
Advances in circuits, sensors, and energy storage elements have opened up many new possibilities in the health industry. In the area of wearable devices, the miniaturization of electronics has spurred the rapid development of wearable vital signs, activity, and fitness monitors. Maximizing the time …
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Harvest-Time Optimal Path Planning in Dynamic Flows
… from one configuration to another in some optimal fashion. Increasingly, having autonomous vehicles that optimally collect/harvest external fields from highly dynamic environments has grown in relevance. Autonomously maximizing the harvest in minimum time is our present path planning …
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Low-power System-on-Chip Processors for Energy Efficient High Performance Computing: The Texas Instruments Keystone II
… Performance Computing (HPC) community recognizes energy consumption as a major problem. Extensive research is underway to identify means to increase energy efficiency of HPC systems including consideration of alternative building blocks for future systems. This thesis considers one such system, …
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Low-power System-on-Chip Processors for Energy Efficient High Performance Computing: The Texas Instruments Keystone II
… Performance Computing (HPC) community recognizes energy consumption as a major problem. Extensive research is underway to identify means to increase energy efficiency of HPC systems including consideration of alternative building blocks for future systems. This thesis considers one such system, …
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Optimization-Based Guidance for Satellite Relative Motion
… We present solutions to several types of optimal orbital maneuvers using a variety of different, realistic assumptions based on the maneuver objectives. Initially, we assume a perfectly circular orbit with a perfectly spherical Earth and analytically solve the under-actuated, …
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