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 69 for “"MAV"”.
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FPGA-aided MAV vision-based estimation
… one of the main challenges in Micro Air Vehicle (MAV) navigation. Today MAVs are becoming more and more prevalent in both civilian and military operations. However, with their reduction in size compared to traditional Unmanned Aircraft Vehicles (UAVs), the computational power and payload that can …
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Towards MAV Autonomous Flight: A Modeling and Control Approach
This thesis is about modeling and control of miniature rotary-wing flying vehicles, with a special emphasis on quadrotor and coaxial systems. Mathematical models for simulation and nonlinear control approaches are introduced and subsequently applied to commercial aircrafts: the DraganFlyer and the …
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Design and Implementation of a Control System for a Quadrotor MAV
The quadrotor is a 200 g MAV with rapid-prototyped rotors that are driven by four brushless electric motors, capable of a collective thrust of around 400 g using an 11 V battery. The vehicle is compact with its largest dimension at 188 mm. Without any feedback control, the quadrotor is unstable. …
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Control and estimation strategies for autonomous MAV landing on a moving platform in turbulent wind conditions
Micro aerial vehicles (MAVs) are increasing in popularity both for recreational and commercial purposes. In particular, autonomous MAVs are promising in the field of drone delivery due to their scalability, deployability, and low cost compared to traditional ground delivery. Hybrid systems, which …
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UAV Communications: Spectral Requirements, MAV and SUAV Channel Modeling, OFDM Waveform Parameters, Performance and Spectrum Management
… revealing the importance of Micro UAVs (MAV) and Small UAVs (SUAV), the thesis determines spectral requirements for control and non-payload communication (CNPC). We show that spectral efficiency, particularly in the downlink, is critical to the large-scale deployment of UAVs. Due to the …
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Análise de fatores da angioarquitetura presentes em malformações arteriovenosas cerebrais associados a manifestação clínica inicial hemorrágica
… das malformações arteriovenosas cerebrais (MAV) como o tamanho, localização e a angioarquitetura com o risco subseqüente de hemorragia podem ser úteis para previsão do comportamento das MAV e podem guiar estratégias de tratamento. Métodos: Nós analisamos prospectivamente 390 pacientes com …
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Folding Solid-Membrane Wing Structure for a Micro Air Vehicle
… for use on a tube launched micro air vehicle (MAV), and experimental wind tunnel results of the wing integrated on an engineering MAV model are presented herein. Due to the sizing and performance requirements of the MAV, the wing must provide sufficient wing area while minimizing its stowed …
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Adaptive Control of Micro Air Vehicles
… controllers work well on Miniature Air Vehicles (MAVs), they require tuning for each MAV. Also, they quickly lose performance in the presence of actuator failures or changes in the MAV dynamics. Adaptive control algorithms that self tune to each MAV and compensate for changes in the MAV during …
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Collaborative Micro Aerial Vehicle exploration of outdoor environments
… led to the creation of Micro Aerial Vehicles (MAVs), a class of Unmanned Aerial Vehicle (UAV), which are small and have autonomous capabilities. At most a few feet in size, a MAV can hover in place, perform Vertical Take-Off and Landing, and easily rotate with a small sensor payload. The …
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Modeling, Designing, Building, and Testing a Microtubular Fuel Cell Stack Power Supply System for Micro Air Vehicle (MAVs)
… cell stack system for micro aerial vehicles (MAVs) was conducted by Virginia Tech in collaboration with Luna Innovations, Inc, in an effort to replace the lithium battery technology currently powering these devices. Investigation of planar proton exchange membrane (PEM) and direct methanol …
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Characterization of Flexible Flapping Wings and the Effects of Solar Cells for Miniature Air Vehicles
… of Flapping Wing Miniature Air Vehicles (MAVs) requires reducing the weight and total energy loss while increasing the efficiency. This thesis investigates an approach to reduce total energy loss through an energy harvesting technology, flexible solar cells. These cells are integrated with …
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An Approach to Fault Management Design for the Proposed Mars Sample Return EDL and Ascent Phase Architectures
… into Mars orbit using a Mars Ascent Vehicle (MAV) for future Earth return. The telecommunications delay from Earth to Mars requires autonomy on-board the spacecraft for different phases of the mission like Entry, Descent \& Landing (EDL) and MAV Launch given limited possible operator …
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Accurate Target Geolocation and Vision-Based Landing with Application to Search and Engage Missions for Miniature Air Vehicles
Miniature air vehicles (MAVs) have attracted a large amount of interest recently both from the research community and from the public. New battery technologies as well as rapid developments in embedded processing and MEMS sensor technologies have greatly increased the potential of these vehicles. …
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Host-parasite interactions of barley yellow dwarf virus and oats: Physiological and immunological studies
… to barley yellow dwarf virus (BYDV) strain MAV-NY were identified from two murine spleen fusions. All the monoclonals recognize native MAV, not pH-denatured virus. Three MAbs cross-react with strain PAV. High affinity antibodies of subclasses IgG1 and IgG2a were purified from ascitic fluids, …
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Development and evaluation of a collision avoidance system for supervisory control of a micro aerial vehicle
… Vehicles (UAVs) and Micro Aerial Vehicles (MAVs) to become increasingly prevalent in a variety of domains. From military surveillance to disaster relief to search-and-rescue tasks, these systems have the capacity to assist in difficult or dangerous tasks and to potentially save lives. To …
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Mercado alternativo de valores y su influencia en el planeamiento financiero de las empresas del sector de seguros de viaje en el Perú
… y el impacto del Mercado Alternativo de Valores (MAV) en la planificación financiera de las empresas del sector de seguros de viaje. El MAV es una iniciativa creada por la Bolsa de Valores de Lima, con el fin de facilitar el acceso a la pequeña y mediana empresa al mercado bursátil con pocos …
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The Effects of Commercial Harvest on the Density and Demography of Aquatic Turtles in Arkansas
… Within the US, the Mississippi Alluvial Valley (MAV) region represents the second highest turtle species richness, after the Mobile River Basin. The MAV region of Arkansas is one of the least regulated in terms of commercial aquatic turtle harvest and has undergone large-scale habitat conversion …
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Deploying fast object detection for micro aerial vehicles
… detection pipeline for a micro aerial vehicle (MAV). This work was done as part of the Defense Advanced Research Projects Agency's (DARPA) Fast Lightweight Autonomy (FLA) program with the goal of creating an autonomous MAV that could explore and map an unknown urban environment. We tested four …
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Predicting Drag Polars For Micro Air Vehicles
<p> Drag polars for three Micro Air Vehicles (MAVs) were measured at Reynolds numbers of 70,000, 50,000, 30,000, and 10,000 and compared to predictions generated using the classical approach. The MAVs tested had different configurations and aspect ratios varying from 1.2 to 1.6 and ratios of wetted …
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Pose estimation using overhead imagery and semantics
… robotic systems such as Micro Aerial Vehicles (MAVs), while developments in camera technologies has allowed for the generation of denser robot perception, such as depth and semantics, derived from environmental cues such as colour, shape and texture. Additionally, with the advent of commercial …
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