Download or read book Qualification of Two Unmanned Aerial Systems for Wind and Turbulence Observations in the Atmospheric Boundary Layer written by Sara Alaoui-Sosse and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of unmanned aerial vehicles (UAVs) for atmospheric research during the last years undergoes a remarkable growth all over the world due to their several advantages. They are a new tool for profiling the main parameters of the atmospheric boundary layer (ABL) such as temperature, humidity and wind vector, as well as for turbulence observations. Their development was inspired by instrumented airplanes. In addition, they are complementary to other existing platforms such as instrumented towers and airplanes, and radiosondes, since they can fly in areas unreachable by these other platforms. We have developed two instrumentation packages for wind and turbulence observations in the atmospheric boundary layer for two UAVs of distinct sizes. The first one is a small size UAV (3.5 kg payload included and with a wingspan of 2.6 m) called OVLI-TA (Objet Volant Leger Instrumenté-Turbulence Atmosphérique). The second one is the fixed wing UAV called BOREAL which has a larger size (25 kg including a payload of 5 kg and with a wingspan of 4.2 m).The meteorological instrumental package of OVLI-TA is composed of a five-hole probe that replaces the nose of the drone, a Pitot probe to measure static and dynamic pressure, a fast inertial measurement unit, a GPS receiver, as well as temperature and moisture sensors. Moreover, for autonomous flights the Pixhawk autopilot is used. The wind tunnel calibrations of the five-hole probe were conducted in order to determine the calibration coefficients of the angles of attack and sideslip. I present the analysis of a qualification flight test conducted in March 2016 in Lannemezan, in the atmospheric research center (CRA) equipped with an instrumented 60 m tower, as well as of the flights conducted in June and July 2016 during the international project DACCIWA (Dynamics-Aerosol-Chemistry-Clouds Interactions in West Africa), in Benin. This study allows evaluating the capacity and performances of OVLI-TA to measure mean values of wind, temperature and humidity, along with turbulence. In this assessment, observations from the 60 m tower and radiosondes were used as a reference.BOREAL's advantages over OVLI-TA lie in its larger payload capacity, its flight endurance that could reach 9 hours, and also its ability to fly in more adverse weather conditions. The developed instrumentation includes a GPS-IMU platform, a five-hole probe replacing the nose of the UAV which measures the angles of attack and sideslip, a Pitot tube, in addition to temperature and humidity sensors. In order to calibrate the five-hole probe, I analyzed the data of wind tunnel test and I used FLUENT software for computational fluid dynamics (CFD) simulations. Furthermore, the first qualification flight test conducted in 2018 allowed us to determine the optimal airspeed of the UAV at which the vibrations are significantly reduced to an acceptable level. Subsequently, in 2020, a first campaign was carried out in Lannemezan in order to qualify the BOREAL capacities to measure wind and turbulence and this following comparisons with the instrumented tower. The UAV's performances are presented in details.

Download or read book Spatially Distributed Wind and Turbulence Measurements with a Fleet of Unmanned Aerial Systems written by Tamino Wetz and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the development of a unique measuring device for wind field measurement in the atmospheric boundary layer and its application to examine spatial turbulence structures in heterogeneous terrain as well as flow measurements around a wind turbine. The innovative measuring system consists of a fleet of 35 quadrotors UAS (unmanned aerial systems), of which a maximum of 20 were used simultaneously. This measuring system enables flexible, simultaneous, spatially distributed measurements of the wind vector in the boundary layer. An algorithm was developed to measure the wind that is based on the position and acceleration sensors of the UAS and does not require additional external wind sensors. The algorithm puts the sensor data in relation to the acting wind forces and is calibrated and validated with the help of reference measurements on a 99-m meteorological mast. The potential of the UAS fleet for wind field and turbulence measurements is shown by comparisons with Doppler wind lidar and ultrasonic anemometer measurement data. Furthermore, a special flight pattern with spatially horizontally distributed measurements was developed to allow for the examination of horizontal turbulence structures. On the one hand, the limit of validity of the Taylor hypothesis of frozen turbulence is tested. On the other hand, it is demonstrated how turbulence structures differ in their horizontal spatial characteristics depending on the atmospheric conditions. Additionally, the correlation of different scales in the frequency domain is examined using coherence. In comparison to models of the decay of coherence, the validity of the models is limited to neutral stratification. Overall, the coherence is smaller for the lateral separation distance than for the longitudinal one. In a final measurement campaign, the knowledge gained and an improved wind algorithm were used to analyze the flow around a wind turbine (WT). At the same time, measurements were carried out in the wake and in the inflow of the WT. Spatially distributed measurements in the near wake of a 2 MW WT clearly show the expected wind speed deficit. Laterally distributed measurements in the wake under stable and near-neutral stratification indicate a double-Gaussian distribution of the lateral velocity profile. Under convective conditions, the turbulent mixing is enhanced, which leads to a measurement of a simple Gaussian distribution already in the near wake. Furthermore, horizontal turbulent flow measurements show the expected energy input from outside the wake into the edge areas of the wake. In addition, it could be shown that a turbulent flow from the center of the wake to the edge areas can also be measured in stable and near-neutral stratification. Also, the occurrence of vortices resulting from the pressure differences at the rotor blade tips was investigated.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Atmospheric Considerations for Uninhabited Aerial Vehicle UAV Flight Test Planning written by Edward H. Teets and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric considerations are a key element in support of uninhabited aerial vehicle (UAV) flight testing. The local atmospheric environment (wind speed and direction, wind shear, temperature, precipitation, and turbulence) must be characterized and understood. The primary objective is to ensure safety of the vehicle, test range, and ground assets. The generalized atmospheric behavior for any potential flight operations site is best described by combining the local seasonal climatology, daily upper atmospheric wind and temperature profiles, and hourly surface and low-level wind observations. This paper describes a continuous forecast update process based on monitoring atmospheric turbulence with surface and low-level wind for the support of UAV flights. Updates ensure the most current available data needed for mission planning. Each mission plan is developed so as not to exceed operation limits because of weather conditions. This paper also discusses climatology, weather forecasts, and day-of-flight weather monitoring for planning of uninhabited aerial vehicle missions.

Download or read book Safety and Reliability in Cooperating Unmanned Aerial Systems written by Camille Alain Rabbath and published by World Scientific. This book was released on 2010 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Overview of recent advances in the analysis and design of health management systems for cooperating unmanned aerial vehicles. Cooperative health management (CHM) systems seek to provide adaptation to the presence of faults by capitalizing on the availability of interconnected computing, sensing and actuation resources. Complements the proposed CHM concepts by means of case studies and application examples. and presents fundamental principles and results encompassing optimization, systems theory, information theory, dynamics, modeling and simulation.

Download or read book Unmanned Aerial Vehicle Applications over Cellular Networks for 5G and Beyond written by Hongliang Zhang and published by Springer Nature. This book was released on 2019-12-13 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses how to plan the time-variant placements of the UAVs served as base station (BS)/relay, which is very challenging due to the complicated 3D propagation environments, as well as many other practical constraints such as power and flying speed. Spectrum sharing with existing cellular networks is also investigated in this book. The emerging unmanned aerial vehicles (UAVs) have been playing an increasing role in the military, public, and civil applications. To seamlessly integrate UAVs into future cellular networks, this book will cover two main scenarios of UAV applications as follows. The first type of applications can be referred to as UAV Assisted Cellular Communications. Second type of application is to exploit UAVs for sensing purposes, such as smart agriculture, security monitoring, and traffic surveillance. Due to the limited computation capability of UAVs, the real-time sensory data needs to be transmitted to the BS for real-time data processing. The cellular networks are necessarily committed to support the data transmission for UAVs, which the authors refer to as Cellular assisted UAV Sensing. To support real-time sensing streaming, the authors design joint sensing and communication protocols, develop novel beamforming and estimation algorithms, and study efficient distributed resource optimization methods. This book targets signal processing engineers, computer and information scientists, applied mathematicians and statisticians, as well as systems engineers to carve out the role that analytical and experimental engineering has to play in UAV research and development. Undergraduate students, industry managers, government research agency workers and general readers interested in the fields of communications and networks will also want to read this book.

Download or read book Atmospheric Considerations for Uninhabited Aerial Vehicle UAV Flight Test Planning written by and published by . This book was released on 1998 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Integration of Unmanned Aerial Vehicles in Wireless Communication and Networks written by Dushantha Nalin K Jayakody and published by Springer Nature. This book was released on 2022-07-06 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive overview of Unmanned Arial Vehicles (UAV) and their integration of wireless communications and networks, including inherent challenges and open access concerns. The authors present the latest technologies associated with UAV-assisted wireless communications and networks by linking their association with 5G Wireless Networks. The authors include positioning of UAV, coagulation attack of UAV, and the green prospective of UAV communication systems. The book explains how the UAV can be integrated with 5G wireless schemes such as ultra-reliable, low density communications, full duplex, and non-orthogonal multiple access (NOMA) for 5G. This book targets graduate students, researchers, and industry personnel.

Download or read book Indoor Navigation Strategies for Aerial Autonomous Systems written by Pedro Castillo-Garcia and published by Butterworth-Heinemann. This book was released on 2016-11-10 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Indoor Navigation Strategies for Aerial Autonomous Systems presents the necessary and sufficient theoretical basis for those interested in working in unmanned aerial vehicles, providing three different approaches to mathematically represent the dynamics of an aerial vehicle. The book contains detailed information on fusion inertial measurements for orientation stabilization and its validation in flight tests, also proposing substantial theoretical and practical validation for improving the dropped or noised signals. In addition, the book contains different strategies to control and navigate aerial systems. The comprehensive information will be of interest to both researchers and practitioners working in automatic control, mechatronics, robotics, and UAVs, helping them improve research and motivating them to build a test-bed for future projects. Provides substantial information on nonlinear control approaches and their validation in flight tests Details in observer-delay schemes that can be applied in real-time Teaches how an IMU is built and how they can improve the performance of their system when applying observers or predictors Improves prototypes with tactics for proposed nonlinear schemes

Download or read book Over 40 Publications Studies Combined UAS UAV Drone Swarm Technology Research written by and published by Jeffrey Frank Jones. This book was released on with total page 3840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 3,800 total pages ... Just a sample of the studies / publications included: Drone Swarms Terrorist and Insurgent Unmanned Aerial Vehicles: Use, Potentials, and Military Implications Countering A2/AD with Swarming Stunning Swarms: An Airpower Alternative to Collateral Damage Ideal Directed-Energy System To Defeat Small Unmanned Aircraft System Swarms Break the Kill Chain, not the Budget: How to Avoid U.S. Strategic Retrenchment Gyges Effect: An Ethical Critique of Lethal Remotely Piloted Aircraft Human Robotic Swarm Interaction Using an Artificial Physics Approach Swarming UAS II Swarming Unmanned Aircraft Systems Communication Free Robot Swarming UAV Swarm Attack: Protection System Alternatives for Destroyers Confidential and Authenticated Communications in a Large Fixed-Wing UAV Swarm UAV Swarm Behavior Modeling for Early Exposure of Failure Modes Optimized Landing of Autonomous Unmanned Aerial Vehicle Swarms Mini, Micro, and Swarming Unmanned Aerial Vehicles: A Baseline Study UAV Swarm Operational Risk Assessment System SmartSwarms: Distributed UAVs that Think Command and Control Autonomous UxV's UAV Swarm Tactics: An Agent-Based Simulation and Markov Process Analysis A Novel Communications Protocol Using Geographic Routing for Swarming UAVs Performing a Search Mission Accelerating the Kill Chain via Future Unmanned Aircraft Evolution of Control Programs for a Swarm of Autonomous Unmanned Aerial Vehicles AFIT UAV Swarm Mission Planning and Simulation System A Genetic Algorithm for UAV Routing Integrated with a Parallel Swarm Simulation Applying Cooperative Localization to Swarm UAVS Using an Extended Kalman Filter A Secure Group Communication Architecture for a Swarm of Autonomous Unmanned Aerial Vehicles Braving the Swarm: Lowering Anticipated Group Bias in Integrated Fire/Police Units Facing Paramilitary Terrorism Distributed Beamforming in a Swarm UAV Network Integrating UAS Flocking Operations with Formation Drag Reduction Tracking with a Cooperatively Controlled Swarm of GMTI Equipped UAVS Using Agent-Based Modeling to Evaluate UAS Behaviors in a Target-Rich Environment Experimental Analysis of Integration of Tactical Unmanned Aerial Vehicles and Naval Special Warfare Operations Forces Target Acquisition Involving Multiple Unmanned Air Vehicles: Interfaces for Small Unmanned Air Systems (ISUS) Program Tools for the Conceptual Design and Engineering Analysis of Micro Air Vehicles Architectural Considerations for Single Operator Management of Multiple Unmanned Aerial Vehicles

Download or read book Embedded Platforms for UAS Landing Path and Obstacle Detection II written by Gennaro Ariante and published by Springer. This book was released on 2024-07-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the design and development of a system that assists remote pilots during navigation. It focuses on the design and development of a ground station that assists remote pilots during maneuvers such as take-off or landing procedures, in case a high accuracy is required or the GNSS signal is lost. Continuing the tradition of the previous volume, and being its revised edition, this book covers the latest UAS regulations together with updated strategies for finding the best and safest trajectory and landing site, with a special focus on urban air mobility applications. It describes the system’s components, such as the LiDAR sensor, the temperature and humidity sensors, the Raspberry Pi 3 controller, and the Bluetooth Low Energy Transmitter, in detail. Further, it discusses the experimental tests carried out in both controlled laboratory settings and real-world environments. All in all, this book offers a timely survey of both regulations of and electronics design for unmanned aircraft systems, with extensive information on new methods and technologies for the development of Detect and Avoid systems for unmanned aerial vehicles.

Download or read book Development of an Unmanned Aerial Vehicle for Atmospheric Turbulence Measurement written by Brandon Michael Witte and published by . This book was released on 2016 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Imaging and Sensing for Unmanned Aircraft Systems written by Vania V. Estrela and published by Institution of Engineering and Technology. This book was released on 2020-04-23 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume book set explores how sensors and computer vision technologies are used for the navigation, control, stability, reliability, guidance, fault detection, self-maintenance, strategic re-planning and reconfiguration of unmanned aircraft systems (UAS).

Download or read book Foundations of Circulation Control Based Small Scale Unmanned Aircraft written by Konstantinos Kanistras and published by Springer. This book was released on 2018-09-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on using and implementing Circulation Control (CC) - an active flow control method used to produce increased lift over the traditionally used systems, like flaps, slats, etc. - to design a new type of fixed-wing unmanned aircraft that are endowed with improved aerodynamic efficiency, enhanced endurance, increased useful payload (fuel capacity, battery cells, on-board sensors) during cruise flight, delayed stall, and reduced runway during takeoff and landing. It presents the foundations of a step-by-step comprehensive methodology from design to implementation and experimental testing of Coandǎ based Circulation Control Wings (CCWs) and CC system, both integral components of the new type of aircraft, called Unmanned Circulation Control Air Vehicle. The methodology is composed of seven coupled phases: theoretical and mathematical analysis, design, simulation, 3-D printing/prototyping, wind tunnel testing, wing implementation and integration, and flight testing. The theoretical analysis focuses on understanding the physics of the flow and on defining the design parameters of the geometry restrictions of the wing and the plenum. The design phase centers on: designs of Coandǎ surfaces based on wing geometry specifications; designing and modifying airfoils from well-known ones (NACA series, Clark-Y, etc.); plenum designs for flow uniformity; dual radius flap designs to delay flow separation and reduce cruise drag. The simulation phase focuses on Computational Fluid Dynamics (CFD) analysis and simulations, and on calculating lift and drag coefficients of the designed CCWs in a simulation environment. 3-D printing and prototyping focuses on the actual construction of the CCWs. Wind tunnel testing centers on experimental studies in a laboratory environment. One step before flight testing is implementation of the qualified CCW and integration on the UAV platform, along with the CC system. Flight testing is the final phase, where design validation is performed. This book is the first of its kind, and it is suitable for students and researchers interested in the design and development of CCWs for small-scale aircraft. Background knowledge on fundamental Aerodynamics is required.

Download or read book Sensing Hazards with Operational Unmanned Technology written by Philip Matthew Kenul and published by . This book was released on 2018 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Sensing Hazards with Operational Unmanned Technology (SHOUT) Project collected atmospheric measures using sensor payloads aboard high altitude, long endurance unmanned aircraft systems (UAS), such as the Global Hawk (GH) aircraft. Use of these measures at regional and global scales have consistently demonstrated positive forecast benefits for high impact weather events, such as hurricanes, tropical cyclones, and land falling Pacific storms. Furthermore, these measures have an important secondary scientific value as gap-fill, should anomalies occur in future satellite coverage. While the scientific value of very high-resolution datasets obtained using UAS technology is gaining merit, cost is a driving force in determining the practicality of transitioning this technology to routine operations. Therefore, the SHOUT project has continued to analyze the costs of using Global Hawk for science observations and as satellite data-gap risk mitigation tool since 2014. This report expands upon previous cost studies; refreshes the Analyses of Alternatives ([AOA], NOAA 2012); explains operational availability of the platform and sensors; assesses the integrated system for operations; and adds to the lessons learned and best practices for the National Oceanic and Atmospheric Administration's (NOAA's) use of the High Altitude Long Endurance (HALE) UAS for routine operations"--Executive summary.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Albatross UAV written by Markus Deittert and published by . This book was released on 2010 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: