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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 120 journals)
Showing 1 - 30 of 30 Journals sorted by number of followers
AIAA Journal     Hybrid Journal   (Followers: 1189)
SpaceNews     Free   (Followers: 826)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 771)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 610)
Acta Astronautica     Hybrid Journal   (Followers: 494)
Advances in Space Research     Full-text available via subscription   (Followers: 457)
Aviation Week     Full-text available via subscription   (Followers: 437)
Aerospace Science and Technology     Hybrid Journal   (Followers: 427)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 383)
Journal of Aircraft     Hybrid Journal   (Followers: 335)
Control Systems     Hybrid Journal   (Followers: 313)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 279)
Journal of Navigation     Hybrid Journal   (Followers: 277)
Aircraft Engineering and Aerospace Technology     Hybrid Journal   (Followers: 261)
Gyroscopy and Navigation     Hybrid Journal   (Followers: 258)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 204)
Space Science International     Open Access   (Followers: 199)
Space Science Reviews     Hybrid Journal   (Followers: 97)
International Journal of Aerospace Engineering     Open Access   (Followers: 82)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 80)
Advances in Aerospace Engineering     Open Access   (Followers: 69)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 69)
Propulsion and Power Research     Open Access   (Followers: 68)
Aerospace     Open Access   (Followers: 60)
Space Safety Magazine     Free   (Followers: 51)
Space Research Today     Full-text available via subscription   (Followers: 48)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 46)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 40)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 39)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 37)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 34)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 34)
International Journal of Aerospace Sciences     Open Access   (Followers: 32)
Journal of Aeronautics & Aerospace Engineering     Open Access   (Followers: 31)
Space Policy     Hybrid Journal   (Followers: 30)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 29)
Journal of Space Weather and Space Climate     Open Access   (Followers: 27)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 27)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 24)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 24)
Artificial Satellites     Open Access   (Followers: 23)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 23)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 22)
Annual of Navigation     Open Access   (Followers: 22)
Chinese Journal of Aeronautics     Open Access   (Followers: 21)
Nonlinear Dynamics     Hybrid Journal   (Followers: 20)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 19)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 18)
Journal of Aerodynamics     Open Access   (Followers: 18)
Aerospace Scientific Journal     Open Access   (Followers: 18)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 17)
Aviation     Open Access   (Followers: 17)
International Journal of Space Structures     Full-text available via subscription   (Followers: 17)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 16)
Fatigue of Aircraft Structures     Open Access   (Followers: 15)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 13)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 12)
Elsevier Astrodynamics Series     Full-text available via subscription   (Followers: 12)
Aeronautical Journal, The     Hybrid Journal   (Followers: 12)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 12)
Journal of Airline and Airport Management     Open Access   (Followers: 12)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 11)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 11)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 11)
Air Force Magazine     Full-text available via subscription   (Followers: 11)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 11)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 10)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 10)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 9)
Population Space and Place     Hybrid Journal   (Followers: 9)
Journal of Aeronautical Materials     Open Access   (Followers: 9)
International Journal of Aviation Management     Hybrid Journal   (Followers: 9)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 9)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 9)
Advances in Aerospace Science and Technology     Open Access   (Followers: 8)
Air Medical Journal     Hybrid Journal   (Followers: 8)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 8)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 7)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 7)
Journal of Aerospace Technology and Management     Open Access   (Followers: 7)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 7)
New Space     Hybrid Journal   (Followers: 6)
Aerospace Systems     Hybrid Journal   (Followers: 6)
International Journal of Turbo and Jet-Engines     Hybrid Journal   (Followers: 6)
RocketSTEM     Free   (Followers: 6)
Civil Aviation High Technologies     Open Access   (Followers: 5)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 5)
REACH - Reviews in Human Space Exploration     Full-text available via subscription   (Followers: 5)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
Aviation Advances & Maintenance     Open Access   (Followers: 5)
Cosmic Research     Hybrid Journal   (Followers: 5)
Unmanned Systems     Hybrid Journal   (Followers: 5)
Space and Polity     Hybrid Journal   (Followers: 4)
Life Sciences in Space Research     Hybrid Journal   (Followers: 4)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal   (Followers: 4)
Astrodynamics     Hybrid Journal   (Followers: 4)
Investigación Pecuaria     Open Access   (Followers: 3)
Aerospace technic and technology     Open Access   (Followers: 3)
Journal of Spatial Science     Hybrid Journal   (Followers: 3)
ASTRA Proceedings     Open Access   (Followers: 3)
Journal of KONBiN     Open Access   (Followers: 3)
Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa / Problems of Mechatronics. Armament, Aviation, Safety Engineering     Open Access   (Followers: 3)
npj Microgravity     Open Access   (Followers: 3)
Journal of Astrobiology & Outreach     Open Access   (Followers: 3)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
Microgravity Science and Technology     Hybrid Journal   (Followers: 2)
Вісник Національного Авіаційного Університету     Open Access   (Followers: 2)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 2)
Ciencia y Poder Aéreo     Open Access   (Followers: 2)
MAD - Magazine of Aviation Development     Open Access   (Followers: 2)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 1)
Open Aerospace Engineering Journal     Open Access   (Followers: 1)
Advances in Astronautics Science and Technology     Hybrid Journal   (Followers: 1)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 1)
Technical Soaring     Full-text available via subscription   (Followers: 1)
Spatial Information Research     Hybrid Journal   (Followers: 1)
Mekanika : Jurnal Teknik Mesin i     Open Access   (Followers: 1)
Perspectives of Earth and Space Scientists i     Open Access  

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Similar Journals
Journal Cover
Unmanned Systems
Number of Followers: 5  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2301-3850 - ISSN (Online) 2301-3869
Published by World Scientific Homepage  [118 journals]
  • Editorial: Special Issue on Interactive Unmanned Systems and Intelligent
           Applications
    • Authors: Hugh H.-T. Liu
      Pages: 1 - 2
      Abstract: Unmanned Systems, Ahead of Print.

      Citation: Unmanned Systems
      PubDate: 2021-03-11T08:00:00Z
      DOI: 10.1142/S2301385021020015
       
  • An Intelligent Ground-Air Cooperative Navigation Framework Basedon
           Visual-Aided Method in Indoor Environments
    • Authors: Zi-Hao Wang, Kai-Yu Qin, Te Zhang, Bo Zhu
      Pages: 1 - 10
      Abstract: Unmanned Systems, Ahead of Print.
      In the future, heterogeneous robots are expected to perform more complex tasks in a cooperative manner, and the onboard navigation system is required to be capable of working safely and effectively in the area where GNSS signal is weak or even could not be received. To demonstrate this concept, we have developed a cooperative navigation system by the use of Ground-Aerial Vehicle Cooperation. The key innovations of the development lie in the following aspects: (1) a local scalable self-organizing network is constructed for data interaction between a small UAV and a reusable ground robot; (2) a new navigation framework is proposed to achieve visual simultaneous localization and mapping (SLAM) where carrying capacity of both the ground vehicle and UAV are systematically considered; (3) an octomap-based 3D environment reconstruction method is developed to achieve map pre-establishment in complex navigation environments, and the classic ORB-SLAM2 system is improved to be adaptive to actual environment exploration and perception. In-door flight experiments demonstrate the effectiveness of the proposed solution. More interestingly, by implementing a centroid tracking algorithm, the cooperative system is further capable of tracking a man moving in indoor environments.
      Citation: Unmanned Systems
      PubDate: 2021-03-06T08:00:00Z
      DOI: 10.1142/S2301385021410065
       
  • Solar Panel Effect on Low-Speed Airfoil Aerodynamic Performance
    • Authors: Mostafa El-Salamony, Mohamed A. Aziz
      Pages: 1 - 15
      Abstract: Unmanned Systems, Ahead of Print.
      Recently, a great interest in search of alternate means of power for the traditional fuel for aircraft propulsion is raised so as to decrease gas emissions and reduce operating costs. For the small and micro unmanned aerial vehicles or small transportation aircraft, there are many challenges in the direction of constructing an electric or solar powered airplane whose wings may possibly be sheltered with photo voltaic PV solar panels to harvest sun’s energy for propulsion. Greatest remarkably success solar powered aircraft has attracted the attention of researchers other than UAV and small aircraft supporters. Although the solar panel is thin, its thickness is considerable compared to the airfoil thickness. This paper aims to evaluate the impact of adding the solar panel over a low camber airfoil suitable for low-Reynolds number flights, as mini UAVs. Three panel installation configurations are examined to stand on the most suitable configuration, in terms of aerodynamic efficiency. The analysis is based on the airfoil characteristics (lift, drag, and moment) and the pressure distribution over the airfoil surface. A parametric study is conducted to study the effect of the solar panel size, thickness, and position on the aerodynamic performance.
      Citation: Unmanned Systems
      PubDate: 2021-03-04T08:00:00Z
      DOI: 10.1142/S2301385021500175
       
  • Casualty Risk Analysis for Remotely Piloted Aircraft Systems Operations
    • Authors: Luca Spanò Cuomo, Giorgio Guglieri
      Pages: 1 - 9
      Abstract: Unmanned Systems, Ahead of Print.
      This paper offers an alternative Casualty Area assessment. This parameter appears in all flying vehicles risk evaluation. This work arises from the intention of contributing to the subject of risk assessment in aviation. All the formulations of the Casualty Area — which will be analyzed in this paper — are tailored for debris with high kinetic energies. These models lead to an overestimation of the risk associated with small drones flight, preventing both their use and the implied operational benefits. The proposed version tailors the small Remotely Piloted Aircraft Systems (commonly known as drones) falling under the A2 European Aviation Safety Agency (EASA) category, C2 class [European Aviation Safety Agency, Civil drones (Unmanned aircraft, 2018), https://www.easa.europa.eu/easa-and-you/civil-drones-rpas, accessed November (2019)], i.e. drones with a mass up to 4 kg. To obtain the new formulation, the authors started with the most used formula, proposed by Montgomery [R. M. Montgomery and J. A. Ward, Casualty Areas from Impacting Inert Debris for People in the Open (Research Triangle Institute, 1995)], used by FAA (Federal Aviation Administration, [Range Safety Group, Common Risk Criteria for National Test Ranges Inert Debris (Range Commanders Council, 2000)] and [Range Safety Group, Common Risk Criteria Standards for National Test Ranges (Range Commanders Council, 2010)]), adopting new hypotheses but following the same process. The results allow a risk formulation more suitable for drones of the above-mentioned size [Range Safety Group, Range Safety Criteria For Unmanned Air Vehicles Supplement (Range Commanders Council, 1999)]. The proposed formulation can be of use for specific regulatory issues. As a matter of fact, many services use small drones: aerial photography during public assemblies, concerts, sporting events, home deliveries, buildings thermal evaluation, to name just a few. The implementation of the present results allows a wider series of operations previously restricted due to the estimation of an incompatible level of risk. In fact, with the new formulation of the Casualty Area, the level of risk is safely lowered, mainly addressing the small dimension drones [European Aviation Safety Agency, Civil drones (Unmanned aircraft), https://www.easa.europa.eu/easa-and-you/civil-drones-rpas, Online accessed November (2019)]. The steps leading to the final formulation derive from a comprehensive analysis, coherent with the guidelines set by FAA and EASA.
      Citation: Unmanned Systems
      PubDate: 2021-02-26T08:00:00Z
      DOI: 10.1142/S2301385021500072
       
  • A Review of Recent Advances in Coordination Between Unmanned Aerial and
           Ground Vehicles
    • Authors: Yulong Ding, Bin Xin, Jie Chen
      Pages: 1 - 21
      Abstract: Unmanned Systems, Ahead of Print.
      Coordination between unmanned aerial vehicles (UAVs) and unmanned ground vehicles (UGVs) has received increasing attention in recent years. The list of successful applications of UAV–UGV coordination systems is growing and demonstrates that UAV–UGV coordination can provide real-world solutions that other types of coordination cannot offer. This paper systematically reviews the advances in UAV–UGV coordination systems during the period of 2015–2020 and offers a comprehensive investigation and analysis of the recent research. First, the essential elements in the UAV–UGV coordination systems are analyzed, and four key functional roles are identified. The close collaboration among functional roles can achieve the UAV–UGV coordination on perception, task, and motion. From the perspective of functional roles, UAV–UGV coordination systems can be further classified into eight categories. The functional-role-based category provides novel insights into analyzing various patterns of UAV–UGV coordination. This paper also discusses the challenges related to UAV–UGV coordination.
      Citation: Unmanned Systems
      PubDate: 2021-02-26T08:00:00Z
      DOI: 10.1142/S2301385021500084
       
  • Offline Navigation (Homing) of Aerial Vehicles (Quadcopters) in GPS Denied
           Environments
    • Authors: Mainak Mondal, Sergey Poslavskiy
      Pages: 1 - 9
      Abstract: Unmanned Systems, Ahead of Print.
      This paper focuses on offline navigation in quadcopters (Return-to-Home), autonomously in GPS Denied Areas or in cases that the aircraft loses GPS Signal by using the Haversine’s Great circle formula to calculate distance and direction. The internal sensors are used to estimate offsets for distance and direction. A control system modification is proposed, resulting in a high success rate with the several tests using a quadcopter with a Pixhawk flight controller, equipped with PX4FLOW.
      Citation: Unmanned Systems
      PubDate: 2021-02-26T08:00:00Z
      DOI: 10.1142/S2301385021500102
       
  • A Survey of Motion and Task Planning Techniques for Unmanned Multicopter
           Systems
    • Authors: Menglu Lan, Shupeng Lai, Tong H. Lee, Ben M. Chen
      Pages: 1 - 34
      Abstract: Unmanned Systems, Ahead of Print.
      Unmanned aerial systems provide many applications with the ability to perform flying tasks autonomously, and hence have received significant research and commercial attention in the past decade. One of the most popular unmanned aerial platforms for such tasks is the small-scale rotorcraft with multiple rotors, commonly known as multicopters. In order for these platforms to perform fully autonomous missions and tasks, they require a sophisticated low-level flight control system that is integrated with advanced task and motion planning modules, which combine together to form the complete unmanned aerial system (UAS). In this paper, the planning module of unmanned multicopter systems is discussed in detail, and a comprehensive survey on techniques for both motion and task planning reported in literature and by the Unmanned Systems Research Group at the National University of Singapore is presented.
      Citation: Unmanned Systems
      PubDate: 2021-02-18T08:00:00Z
      DOI: 10.1142/S2301385021500151
       
  • Discrete Pigeon-Inspired Optimization-Simulated Annealing Algorithm and
           Optimal Reciprocal Collision Avoidance Scheme for Fixed-Wing UAV Formation
           Assembly
    • Authors: Xuzan Liu, Yu Han, Jian Chen
      Pages: 1 - 15
      Abstract: Unmanned Systems, Ahead of Print.
      Multi-UAV system is an important part of unmanned system, which plays an indispensable role in military field and civil agriculture. First, task assignment model including complex constraints is established and Discrete Pigeon-Inspired Optimization-Simulated Annealing algorithm (DPIO-SA) is proposed to solve it, which updates the speed and position of pigeons through exchange and cross operations. Then, Genetic Algorithm (GA) is adopted to optimize the UAVs’ locations in formation. The experimental results show that the average fitness value of DPIO-SA is 13.5% higher than DPIO; After running the algorithm for 30 times, the number of times that DPIO-SA algorithm reaches the global optimum is 15, while DPIO is 2. Both mean DPIO-SA is easier to jump out of local extremum. To describe the fixed-wing UAV, the Unicycle model is adopted. PID control is used to control the fixed-wing’s heading and speed. Aiming at the collision avoidance, Optimal Reciprocal Collision Avoidance (ORCA) algorithm is proposed, which allows fixed-wings to avoid collisions without having to communicate with each other. In the algorithm, the velocity region is divided by the definition of velocity obstacle, and the optimal velocity is obtained by linear planning algorithm. This enables the fixed-wings’ formation to find the right velocity in real time and effectively to avoid collision. Experiments show that 24 fixed-wings completed the formation assembly after running 16.4 s. Finally, according to the Contract Network Algorithm (CNA), the task scheduling problem is solved by the interaction among fixed-wings.
      Citation: Unmanned Systems
      PubDate: 2021-02-06T08:00:00Z
      DOI: 10.1142/S230138502141003X
       
  • A Behavior-Based Mobile Robot Navigation Method with Deep Reinforcement
           Learning
    • Authors: Juncheng Li, Maopeng Ran, Han Wang, Lihua Xie
      Pages: 1 - 9
      Abstract: Unmanned Systems, Ahead of Print.
      Deep reinforcement learning-based mobile robot navigation has attracted some recent interest. In the single-agent case, a robot can learn to navigate autonomously without a map of the environment. In the multi-agent case, robots can learn to avoid collisions with each other. In this work, we propose a behavior-based mobile robot navigation method which directly maps the raw sensor data and goal information to the control command. The learned navigation policy can be applied in both single-agent and multi-agent scenarios. Two basic navigation behaviors are considered in our method, which are goal reaching and collision avoidance. The two behaviors are fused based on the risk-level estimation of the current state. The navigation task is decomposed using the behavior-based framework, which is capable of reducing the complexity of the learning process. The simulations and real-world experiments demonstrate that the proposed method can enable the collision-free autonomous navigation of multiple mobile robots in unknown environments.
      Citation: Unmanned Systems
      PubDate: 2021-02-05T08:00:00Z
      DOI: 10.1142/S2301385021410041
       
  • Survey on Localization Systems and Algorithms for Unmanned Systems
    • Authors: Shenghai Yuan, Han Wang, Lihua Xie
      Pages: 1 - 35
      Abstract: Unmanned Systems, Ahead of Print.
      Intelligent unmanned systems have important applications, such as pesticide-spraying in agriculture, robot-based warehouse management systems, and missile-firing drones. The underlying assumption behind all autonomy is that the agent knows its relative position or egomotion with respect to some reference or scene. There exist thousands of localization systems in the literature. These localization systems use various combinations of sensors and algorithms, such as visual/visual-inertial SLAM, to achieve robust localization. The majority of the methods use one or more sensors from LIDAR, camera, IMU, UWB, GPS, compass, tracking system, etc. This survey presents a systematic review and analysis of published algorithms and techniques chronologically, and we introduce various highly impactful works. We provide insightful investigation and taxonomy on sensory data forming principle, feature association principle, egomotion estimation formation, and fusion model for each type of system. At last, some open problems and directions for future research are also included. We aim to survey the literature comprehensively to provide a complete understanding of localization methodologies, performance, advantages and limitations, and evaluations of various methods, shedding some light for future research.
      Citation: Unmanned Systems
      PubDate: 2021-02-05T08:00:00Z
      DOI: 10.1142/S230138502150014X
       
  • Reverse Engineering and Database of Off-the-Shelf Propellers for
           Middle-Size Multirotors
    • Authors: Yeong-Ki Jung, Kyoungsik Chang, Sang-Hwan Park, Van Thanh Ho, Ho-Joon Shim, Min-Woo Kim
      Pages: 1 - 12
      Abstract: Unmanned Systems, Ahead of Print.
      In this work, 22 off-the-shelf propellers of 15–40 inches in diameter are reverse-engineered using a scanning system and reverse engineering software. Geometric information, including the diameter and pitch of the propeller and its airfoil sections, are extracted, and the chord length and twist angle of the extracted airfoil sections are investigated. All processes for reverse engineering are validated through comparison with design drawing information, product and performance data of the KPROP propeller designed by Korea Aerospace Research Institute. Based on the validated process, a database of 22 commercial propellers from four companies is constructed containing all the reverse-engineered information. The chord length, the maximum length and twist angle with respect to the diameter of the extracted airfoil section are analyzed in comparison with each other depending on the company and propeller size. In addition, the thrust and torque are simulated using computational fluid dynamic methodology, and the predictions are compared with reference data provided by the manufacturers.
      Citation: Unmanned Systems
      PubDate: 2021-01-18T08:00:00Z
      DOI: 10.1142/S2301385021500163
       
  • Impact of N-Shaped Wing Morphing on Solar-Powered Aircraft
    • Authors: Mostafa E. El-Salamony, Mohamed A. Aziz
      Pages: 1 - 12
      Abstract: Unmanned Systems, Ahead of Print.
      Generally, unmanned aerial vehicles and micro aerial vehicles depend on batteries or conventional fuel as a source of energy. These sources of energy have limited flight time, relatively high cost, and also a certain level of pollutants. Solar energy applied to aerial vehicles is an excellent alternative way to overcome other sources of energy’s disadvantage. This study aimed to design a solar-powered aerial vehicle to achieve continuous flight on Earth. The efficiency of the solar system is related to the absorbed sun rays. The concept of an anti-symmetric N-shaped morphing wing is a good idea to increase the collected solar energy during the daily sun path. But this comes with the penalty of side forces and moments due to the anti-symmetry of the wing. This paper introduces a study for two parameters that strongly affect the aerodynamics of the N-shaped morphing wing; the dihedral part angle and the dihedral part length. The impact of the dihedral angle decreases the lift coefficient and increases the drag coefficient. The impact of the morphing wing on the aircraft performance is also considered.
      Citation: Unmanned Systems
      PubDate: 2020-12-21T08:00:00Z
      DOI: 10.1142/S2301385021500138
       
  • Survey on the Development of Aerial–Aquatic Hybrid Vehicles
    • Authors: Yu Herng Tan, Ben M. Chen
      Pages: 1 - 20
      Abstract: Unmanned Systems, Ahead of Print.
      As the development of mobile robots matures, there is an increasing amount of interest in expanding the functionality of such robots through developing multimodal locomotion. As compared to land–water or land–air hybrids, the design of air–water vehicles is much less straightforward due to the fact that both mediums are three-dimensional fluid spaces and there is inherent disparity in fluid properties between them. As such, the development of these vehicles has received limited attention until very recently. Nevertheless, the potential applications of such vehicles range widely from military surveillance, oceanic data collection to heterogeneous robot team operation, which has led to an increasing number of projects working on aerial–aquatic hybrid mobility. In this paper, we discuss the fundamental challenges associated with aerial–aquatic hybrid locomotion as well as the necessary trade-offs in design decisions. We also summarize and review the existing work and prototypes of aerial–aquatic vehicles that have been designed thus far, analyzing the range of solutions that have been adopted to solve the aforementioned challenges. Lastly, the limitations of these solutions are analyzed to offer a perspective on how future developments in the area can enable greater functionality for the concept.
      Citation: Unmanned Systems
      PubDate: 2020-12-10T08:00:00Z
      DOI: 10.1142/S2301385021410028
       
  • A New Nonlinear Control Design Strategy for Fixed Wing Aircrafts Piloting
    • Authors: A. Hamissi, K. Busawon, L. Dala, Y. Bouzid, M. Zaouche, M. Hamerlain
      Pages: 1 - 16
      Abstract: Unmanned Systems, Ahead of Print.
      This paper proposes a novel nonlinear feedback control strategy for velocity and attitude control of fixed wing aircrafts. The key feature of the control design strategy is the introduction of a virtual control input in order to deal with the underactuation property of such vehicles and to indirectly control the orientation of the aircraft. As such, the proposed strategy consists of three control loops each realizing a specific task. Simulations are carried out by using the jetstream-3102 aircraft in a real-time virtual Simulation Platform for the development of Aircraft Control Systems (SP-ACS). The proposed approach of control is model-based for which we have introduces an identification part before test and validation. We use the Total Least Squares Estimation (TLSE) technique to identify the aerodynamic parameters, which are unknown, variable and classified. Each aerodynamic coefficient is defined as the mean of its numerical values. All other variations are considered as modeling uncertainties that will be compensated by the robustness of the piloting law. Simulation results on Jetstream-3102 aircraft show very good performance in terms of convergence towards the desired reference trajectories and in terms of robustness with respect to modeling uncertainties.
      Citation: Unmanned Systems
      PubDate: 2020-11-25T08:00:00Z
      DOI: 10.1142/S2301385021500126
       
  • Optimal Solution of a Target Defense Game with Two defenders and a Faster
           Intrude
    • Authors: Han Fu, Hugh H.-T. Liu
      Pages: 1 - 16
      Abstract: Unmanned Systems, Ahead of Print.
      A target defense game with two defenders and a faster intruder is solved based on the classic differential game theory. In the game, the intruder seeks to enter a circular target area, while the defenders endeavor to capture it outside of the target. Under the faster intruder assumption, the game has two phases, where the optimal trajectories are straight and curved, respectively. In the second phase, a peculiar phenomenon exists where the intruder moves at the edge of one defender’s capture region, yet this defender cannot force capture. Because of this, the terminal states of the game are singular, therefore the standard method of integrating optimal trajectories from terminal states is not applicable. The way to circumvent this singularity is to solve the optimal trajectories of a two-player game between the intruder and the closer defender, and assemble them with the trajectory of the other defender. The key contribution of this paper is the solution of the intruder-closer-defender subgame against a circular target area. In the vector field of the optimal trajectories, two singular surfaces and a singular point are observed. Each singular surface indicates a discontinuity in the closer defender’s control, while the singular point represents a situation where the target is successfully protected by a single defender. The complete solution of the two-defender game is solved based on the result of the intruder-closer-defender subgame. The proposed solution is verified through a special case where the capture range is zero. This verification also presents a simpler approach of solving the zero capture range problem.
      Citation: Unmanned Systems
      PubDate: 2020-10-30T07:00:00Z
      DOI: 10.1142/S2301385021410016
       
  • Investigation of Orientation Estimation of Multiple IMUs
    • Authors: Simone A. Ludwig
      Pages: 1 - 9
      Abstract: Unmanned Systems, Ahead of Print.
      Inertial Measurement Units (IMUs) were first applied to aircraft navigation and large devices in the 1930s. At that time their application was restricted because of constraints such as size, cost, and power consumption. In recent years, however, Micro-electromechanical (MEMS) IMUs were introduced with very favorable features such as low cost, compactness, and low processing power. One of the disadvantages of these low cost IMU sensors is that the accuracy is lower compared to high-end sensors. However, past experimental results have shown that redundant Magnetic and Inertial Measurement Units (MIMUs) improve navigation performance such as for unmanned air vehicles. Even though past simulation and experimental results demonstrated that redundant sensors improve the navigation performance, however, none of the current research work offers information as to how many sensors are required in order to meet a certain accuracy. This paper evaluates different numbers of sensor configurations of an MIMU sensor array using a simulation environment. Differently rotated MIMU sensors are incrementally added and the Madgwick filter is used to estimate the Euler angles of foot mounted MIMU data. The evaluation measure used is the root mean square error (RMSE) based on the Euler angles as compared to the ground truth. During the experiments it was noticed that the execution time with increasing number of sensors increases exponentially, and thus, the parallelization of the code was designed and implemented, and run on a multi-core machine. Thus, the speedup of the parallel implementation was evaluated. The findings using the parallel version with 16 sensors are that the execution time is less than twice the execution time of having only 1 sensor and 24 times less than using the sequential version with the added benefit of a 26% increase in accuracy.
      Citation: Unmanned Systems
      PubDate: 2020-10-29T07:00:00Z
      DOI: 10.1142/S2301385021500114
       
 
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