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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
Showing 1 - 30 of 30 Journals sorted by number of followers
AIAA Journal     Hybrid Journal   (Followers: 1126)
SpaceNews     Free   (Followers: 860)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 791)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 720)
Aviation Week     Full-text available via subscription   (Followers: 464)
Aerospace Science and Technology     Hybrid Journal   (Followers: 387)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 369)
Advances in Space Research     Hybrid Journal   (Followers: 365)
Control Systems     Hybrid Journal   (Followers: 318)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 309)
Journal of Aircraft     Hybrid Journal   (Followers: 305)
Acta Astronautica     Hybrid Journal   (Followers: 293)
Gyroscopy and Navigation     Hybrid Journal   (Followers: 265)
Journal of Navigation     Hybrid Journal   (Followers: 239)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 239)
Aircraft Engineering and Aerospace Technology     Hybrid Journal   (Followers: 204)
Space Science International     Open Access   (Followers: 193)
Space Science Reviews     Hybrid Journal   (Followers: 92)
Propulsion and Power Research     Open Access   (Followers: 92)
International Journal of Aerospace Engineering     Open Access   (Followers: 82)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 79)
Advances in Aerospace Engineering     Open Access   (Followers: 79)
Aerospace     Open Access   (Followers: 74)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 60)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 53)
Space Safety Magazine     Free   (Followers: 49)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 48)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 45)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 42)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 36)
International Journal of Aerospace Sciences     Open Access   (Followers: 34)
Space Policy     Hybrid Journal   (Followers: 31)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 30)
Journal of Aeronautics & Aerospace Engineering     Open Access   (Followers: 30)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 29)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 29)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 29)
Journal of Space Weather and Space Climate     Open Access   (Followers: 29)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 28)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 27)
Nonlinear Dynamics     Hybrid Journal   (Followers: 26)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 25)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 24)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 24)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 22)
Artificial Satellites     Open Access   (Followers: 22)
Frontiers in Aerospace Engineering     Open Access   (Followers: 21)
Chinese Journal of Aeronautics     Open Access   (Followers: 20)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 20)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 20)
International Journal of Space Structures     Full-text available via subscription   (Followers: 19)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 19)
Fatigue of Aircraft Structures     Open Access   (Followers: 17)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
Advances in Aerospace Science and Technology     Open Access   (Followers: 17)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 13)
Aeronautical Journal, The     Hybrid Journal   (Followers: 13)
International Journal of Micro Air Vehicles     Open Access   (Followers: 12)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 12)
Aviation     Open Access   (Followers: 12)
Journal of Airline and Airport Management     Open Access   (Followers: 12)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 12)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 12)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 11)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 11)
Aerospace Systems     Hybrid Journal   (Followers: 11)
Population Space and Place     Hybrid Journal   (Followers: 10)
Journal of Aerospace Technology and Management     Open Access   (Followers: 10)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 10)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 9)
Journal of Aeronautical Materials     Open Access   (Followers: 9)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 8)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 8)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal   (Followers: 8)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 7)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 7)
Aerospace technic and technology     Open Access   (Followers: 7)
Air Medical Journal     Hybrid Journal   (Followers: 6)
Space and Polity     Hybrid Journal   (Followers: 6)
International Journal of Aviation Management     Hybrid Journal   (Followers: 6)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 6)
New Space     Hybrid Journal   (Followers: 6)
Journal of Astrobiology & Outreach     Open Access   (Followers: 6)
RocketSTEM     Free   (Followers: 6)
Civil Aviation High Technologies     Open Access   (Followers: 6)
Astrodynamics     Hybrid Journal   (Followers: 6)
Cosmic Research     Hybrid Journal   (Followers: 5)
International Journal of Hypersonics     Full-text available via subscription   (Followers: 5)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
Transport and Aerospace Engineering     Open Access   (Followers: 5)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 5)
Journal of Spatial Science     Hybrid Journal   (Followers: 4)
Unmanned Systems     Hybrid Journal   (Followers: 4)
Life Sciences in Space Research     Hybrid Journal   (Followers: 4)
Advances in Astronautics Science and Technology     Hybrid Journal   (Followers: 4)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 4)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 4)
Gravitational and Space Research     Open Access   (Followers: 4)
Microgravity Science and Technology     Hybrid Journal   (Followers: 3)
ASTRA Proceedings     Open Access   (Followers: 3)
npj Microgravity     Open Access   (Followers: 3)
Ciencia y Poder Aéreo     Open Access   (Followers: 3)
Open Aerospace Engineering Journal     Open Access   (Followers: 3)
Transactions on Aerospace Research     Open Access   (Followers: 3)
Xibei Gongye Daxue Xuebao / Journal of Northwestern Polytechnical University     Open Access   (Followers: 3)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 2)
MAD - Magazine of Aviation Development     Open Access   (Followers: 2)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
Spatial Information Research     Hybrid Journal   (Followers: 2)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 2)
Mekanika : Jurnal Teknik Mesin i     Open Access   (Followers: 2)
Investigación Pecuaria     Open Access   (Followers: 2)
Вісник Національного Авіаційного Університету     Open Access   (Followers: 1)

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Journal Cover
International Journal of Aeronautical and Space Sciences
Number of Followers: 5  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2093-274X - ISSN (Online) 2093-2480
Published by Springer-Verlag Homepage  [2468 journals]
  • Soft Landing of a Hybrid Rocket Thruster Powered Platform:
           Hardware-in-the-Loop Simulation

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      Abstract: Abstract Soft landing, defined as a controlled and gentle touchdown which prevents any damage, is a crucial phase of planetary landing modules and vertical take-off and landing aircraft. This paper discusses the soft landing of a hybrid rocket-thruster-powered platform using a hardware-in-the-loop simulation (HILS) framework. The concept of a hybrid rocket thruster-powered platform was conceived as part of a system development study aimed at bringing out an effective propulsion unit for achieving VTOL in aircraft and UAVs. To simplify the scope of the preliminary investigation, the platform’s movement was restricted to vertical translation. The hardware-in-the-loop simulation setup integrates a lab-scale hybrid rocket thruster in the hardware module with the simulated platform dynamics model. A control algorithm was implemented to regulate/tweak the real-time hardware—the thruster—to enable the simulated model of the platform to track a predefined descent velocity profile. A proportional-integral-derivative (PID) controller regulated the oxidiser valve opening, controlling the oxidiser flow rate to the hybrid rocket motor and, consequently, the thrust to maintain the desired velocity profile of the platform during the descent. The hardware-in-the-loop simulation setup demonstrated a successful soft landing of the platform with a touchdown velocity of less than 1 m/s.
      PubDate: 2024-08-24
       
  • Analysis of Interaction Between Two V Tails Based on Dynamic Mode
           Decomposition

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      Abstract: Abstract The flowfield around v tails with different rudder deflection is simulated by improved delayed detached eddy simulation method and the dynamic mode decomposition is adopted to analyze spatial patterns and growth/decay rates. The effects of rudder deflection on yawing moment, pressure pulsation, and spanwise flow are discussed when the rudder in one side of v tail rotates upward and downward. The rudder deflection in one side has a beneficial effect on yawing moment of full model but has an adverse effect on yawing moment of other v tail. Because of rudder deflection, the pressure fluctuation of the other v tail is weakened. By analyzing the modes extracted from the time-dependent pressure on v tail and spanwise velocity between v tail, the balance of proportion of decay and growth modes is broken down by rudder deflection. When there is rudder deflection, more pressure characteristics and spanwise flow characteristics are extracted and most of them are in the state of decay. The rudder deflection results in that the modes inclined to be close to the neutral line and the corresponding spatial patterns change slowly.
      PubDate: 2024-08-24
       
  • Development of a Lunar Vehicle with a Hybrid Rocket Engine Produced Using
           Lunar Resources

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      Abstract: Abstract This article presents a comprehensive study on the innovative use of in-situ lunar resources for the development of a hybrid rocket engine utilizing magnesium (Mg) and aluminium (Al), which are abundantly available in lunar regolith. The primary focus is on the feasibility and sustainability of using these metal oxides as primary fuels in propulsion systems specifically designed for lunar missions. The research encompasses the design phases of a lunar lander, highlighting the application of these metals in the engine design to facilitate efficient space travel between research stations on the Moon’s surface. Detailed discussions cover the extraction and processing of Mg and Al directly on the lunar surface through adapted electrolysis processes suitable for the Moon’s environment. The article also explores the engineering of a cryogenic tank system using native lunar materials to address the challenges posed by the Moon’s extreme temperature fluctuations. A key component of the study is the simulation of simple trajectory calculations for travel between lunar research locations using the newly designed hybrid rocket engine. Theoretical analyses suggest that this metal-based propulsion technology could significantly enhance the logistical capabilities of lunar exploration missions, offering a viable solution for both crewed and uncrewed missions. The development of such technologies not only aims to reduce Earth dependence by utilizing lunar resources but also sets a precedent for future interplanetary travel infrastructure.
      PubDate: 2024-08-24
       
  • Optimal Vertiport Locations for Air Taxi Services in Seoul Metropolitan
           Area

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      Abstract: Abstract Urban air mobility (UAM) is a new mode of transportation for congested metropolitan areas. UAM operations start and end at a vertiport, the airport for UAM. Therefore, optimal vertiport locations are essential for efficient and effective UAM operation. This study proposes a vertiport location problem to determine optimal vertiport locations under the decision-dependent and probabilistic demands of UAM. The proposed location problem is a quadratic programming problem that maximizes the total UAM demand determined by travel time and cost. This study introduces a heuristic algorithm to efficiently solve real-world problems in a large, congested metropolitan area. Results of the case study showed that the vertiport network can be expanded in stages: the optimal locations in a smaller network (e.g., five vertiports) are all included in a larger network (e.g., ten vertiports). However, planning is necessary before action, as transport facilities such as vertiports are costly and difficult to relocate. In addition, a sensitivity analysis was performed to evaluate the impact of various operational aspects of UAM, such as the catchment area and minimum flight distance, on the optimal vertiport locations. As a result, vertiport accessibility is critical to the profitability of UAM. Decision-makers can use the results of this study to plan a vertiport network for air taxi services in metropolitan areas.
      PubDate: 2024-08-24
       
  • Multidisciplinary Design Optimization Processes for Efficiency Improvement
           of Aircraft: State-of-the-Art Review

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      Abstract: Abstract During actual flight processes, aircraft face various complex operating conditions and must consider the requirements of different disciplines to achieve good overall performance. Multidisciplinary design optimization (MDO) for aircraft is a complex and time-consuming task, making efficiency crucial in aircraft design. This paper starts from the conventional MDO process, covering five aspects including design variables, performance evaluation methods, MDO strategies, optimization algorithms, and knowledge extraction for enhancing MDO efficiency. It introduces multiple techniques and current research status aimed at improving MDO efficiency, and, combined with artificial intelligence, outlines future directions for MDO development. This paper aims to help MDO researchers clarify their thoughts and provide references for advancing current MDO methods.
      PubDate: 2024-08-23
       
  • Supersonic MLN Thrust Correction at HT with Application to The Missile
           Trajectory

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      Abstract: Abstract The aim of this work is to develop a new numerical calculation program making it possible to correct the thrust coefficient CF and the exit Mach number ME of an existing MLN by studying the effect of the stagnation temperature T0 of the combustion chamber below the dissociation threshold of the molecules, based on the use of the HT model to, firstly, correct the flow in the nozzle, and then deduce the new corresponding values of (CF)C and (ME)C. The nozzle equipped with missiles and supersonic aircraft is determined using the PG model. This model is developed without dependence of T0. In reality, and depending on the used propellants, the combustion chamber T0 value can reach high values exceeding 500 K. Since T0 can be high, the (CF)C and (ME)C cannot be those obtained by the PG model. They must respond to the behavior of T0 effect, since the gas actually behaves like a gas at HT. Since the MLN has an unchanged contour, that is to say the mass of the nozzle is unchanged, it is necessary to correct the (CF)PG as well as, (ME)PG in order to further correct the other performances of the aerospace machines using the MLN, like the range, flight time, and maximum altitude of the supersonic missiles. An introduction of two new dimensionless coefficients λ and ψ making it possible to respectively determine the correction rate of (CF)C and (ME)PG compared to those determined by the manufacturers during the design of the MLN by the PG model. The calculation of the error between the obtained correction value and that given by the manufacturer is done for all parameters. The application is made for air and for three other gases H2O (gas), CO and N2. For example when (ME)PG = 3.00, T0 = 3500 K, r* = 1.00 and air, we will have a correction until 21.16% for (CF)C and 9.50% for (ME)C.
      PubDate: 2024-08-15
       
  • Optimizing Nanosatellite Power Generation Integrating Heat Pipes and
           Thermoelectric Generators for Low Earth Orbit Conditions

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      Abstract: Abstract Electric power generation is crucial for efficiently operating spacecraft, including nanosatellites. Solar panels are widely used for this purpose; however, alternative technologies have been investigated to enhance nanosatellite power generation due to area limitations and low efficiency. This study conducted experimental research involving integrating two devices, heat pipes and thermoelectric generators (TEGs), to augment electric power generation in nanosatellites, particularly those of the 1U CubeSat standard. The study encompassed an assessment of the performance of these devices in various configurations and couplings within a nanosatellite. Furthermore, the feasibility of employing commercial copper–water heat pipes in nanosatellites was also explored. For this, a thermal vacuum chamber was developed that emulated space conditions and validated the experiments constructed. By utilizing solar irradiance data from the UFSC-developed CubeSat FloripaSat-I, it was possible to emulate the behavior of a solar panel, heat pipe, and TEG within the thermal vacuum chamber. The results presented in this study show that copper–water heat pipes coupled to solar panels increase electricity generation by 23%. When calculating the ratio between the energy generated by the device's mass, the value found was 10.05 mWh/g, demonstrating the viability of this approach. Experimental results demonstrated that copper–water heat pipes work in orbital conditions, even in temperatures below 0 °C. This adaptability is attributed to the transient regime in a low Earth orbit and the continuously imposed thermal loads, allowing its functionality in these conditions.
      PubDate: 2024-08-12
       
  • A Design Approach for Piccolo Tube Fuel Diffusers to Meet Airworthiness
           Requirements

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      Abstract: Abstract Electrostatic discharge is one of the ignition sources that cause aircraft fuel tank fires and explosions. The airworthiness regulations and advisory circulars propose the design of a piccolo diffuser to limit the fuel flow velocity to prevent the occurrence of sparks or arc discharges in fuel tanks due to fuel flow. However, the airworthiness regulations and advisory circulars do not provide specific guidance on how to carry out the design of piccolo diffusers, and at the same time, the current perforated tube design method cannot be used to obtain a diffuser that meets the airworthiness technical requirements. Therefore, combined with the knowledge of fluid mechanics, the design method of piccolo tube diffuser is analyzed and discussed in this paper. Taking the design of piccolo tube diffuser for a certain type of aircraft as an example, the structural parameters of piccolo tube such as the diameter of the holes, the method of distributing the orifices, and the position and height of the baffle plates are optimized based on the computational fluid dynamics (CFD) method, and the design result that meets the requirements of fuel flow velocity limitation is obtained. The results show that the diffuser design method with built-in baffle plates can regulate the pressure inside the tube and solve the problem of uneven distribution of outlet flow velocity, compared with the current design method of perforated tubes. Based on the calculation results, the design principle of built-in baffle plates is concluded, and a universal design method of piccolo tube fuel diffuser with built-in baffle plates is proposed, which can meet the double requirements of high refueling efficiency and low flow velocity limitation at the same time. It makes up for the lack of design details in AC 25.981-1D and provides useful guidance for the design of piccolo tube diffusers that meet airworthiness requirements.
      PubDate: 2024-08-08
       
  • Study on Characteristic Modeling and Command Tracking Control Method for
           Variable Configuration Aircraft

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      Abstract: Abstract This paper investigates the characteristic modeling of a novel foldable wing aircraft and evaluates the control performance of various command tracking controllers. Firstly, a longitudinal four-degree-of-freedom nonlinear dynamical model is developed by employing the screw theory in conjunction with the Newton–Euler method. Then, the linear variable parameter (LPV) model is established with flight-path angle and folding angle as time-varying parameters. A trim and small-disturbance linearization is applied to each working point within the flight mission. Eventually, to ensure the flight stability of the deformation process, this paper employs both LQR and PID controllers, accomplishing the command tracking control for the nonlinear model. Simulation results show that compared with the fixed configuration control strategy, adopting a variable configuration control strategy reduces the angle of attack, thereby mitigating the stall risk caused by the excessive angle of attack during the climbing process. Additionally, the propeller speed is diminished under the variable configuration control strategy, which helps to minimize the flight energy consumption and improve the cruise capability.
      PubDate: 2024-08-07
       
  • Investigation of the Characteristic Length Scale and Influencing Factors
           for Supersonic Gas Jets

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      Abstract: Abstract Supersonic gas jets have been widely studied in aerospace applications, rocket engines, and hypersonic aircraft. Studying the characteristic length scale and influencing factors is of great significance for a deeper understanding of the flow characteristics of supersonic gas jets and the recognition of the target characteristics of aircraft. This paper conducts an in-depth study on the supersonic gas jet characteristics of rocket motors under ballistic missile flight conditions. By changing the three factors of nozzle pressure ratio (NPR), specific heat ratio of exhaust gasses, and co-flow velocity, the study analyzes their effects on the characteristic length scale of supersonic gas jets and explores the rules and mechanisms behind them. The results show the correlation between the NPR and the non-dimensional characteristic length scale, indicating that as the NPR increases in a logarithmic coordinate system, the non-dimensional characteristic length scale exhibits a corresponding increase. When the co-flow velocity is below the maximum velocity of the exhaust flow, the non-dimensional characteristic length scale increases with the co-flow velocity. The phenomenon is not obvious when the co-flow velocity is greater than the maximum velocity of the exhaust flow. Additionally, the specific heat ratio and air mixing degree also have a certain impact on the non-dimensional characteristic length scale.
      PubDate: 2024-08-05
       
  • Tracking of Maneuvering Extended Object with Random Hypersurface Model
           Based on Adaptive Uncorrelated Conversion Filter

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      Abstract: Abstract Maneuvering extended object tracking is a rapidly developing research field, owing to the advent of high-resolution sensors, and is of significant value in both civilian and military applications. However, current extended object tracking techniques are limited by the linear minimum mean square error estimation framework, which constrains their tracking performance. And the unknown time-varying characteristics of the system noise will also bring the problem of imprecise estimation for the tracking. Thus, this study proposes a novel approach to track maneuvering extended objects using a star-convex random hypersurface model based on an adaptive uncorrelated conversion filter. The proposed method employs the additional measurement information, thereby breaking the linear estimator framework, and an adaptive strategy is also introduced to solve the noise interference problem. The simulation results demonstrate the efficacy of the proposed approach, which enhances the accuracy of the object’s kinematic state and extension estimation, compared to several commonly used filters.
      PubDate: 2024-08-05
       
  • Active Vibration Suppression of the Wind Tunnel Model Support Structure by
           Positive Position Feedback Controller with Robust Phase Compensator

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      Abstract: Abstract In wind tunnel tests, to reduce the aerodynamic interference, the slender cantilever sting structure is usually used to support aircraft models. Due to its low structural damping, harmful low-frequency vibration often occurs during wind tunnel tests which leads to the degradation of data accuracy and test safety, as well as the limitation of test envelope. To ensure the wind tunnel testing capability and improve the data quality, an active vibration suppression system based on piezoelectric stack actuators is developed in this paper. A sting-root active damping device composed of four piezoelectric stacks is designed to suppress the vibration of the cantilever sting in the pitch plane. Meanwhile, the working principle and dynamic model of the active vibration suppression system is analyzed. Furthermore, considering the phase deviations in the control system and the structural natural frequency variation problem, a positive position feedback (PPF) controller with a robust phase compensator (RPC) is proposed to realize stable vibration mitigation performance. To verify the feasibility and validity of the active vibration suppression system, a series of experiments are conducted in the laboratory. Experimental results show that the vibration of the wind tunnel model support structure can be effectively suppressed with a high convergence rate under different excitation conditions and natural frequency variations, which indicates the superior damping and robustness performance of the proposed piezoelectric-based active vibration suppression system.
      PubDate: 2024-08-02
       
  • Flight Test Design and Nonlinear Model Identification for Landing Gear
           Aerodynamics

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      Abstract: Abstract In this study, a nonlinear aerodynamic modeling method for landing gear extension and retraction process based on the least square method is proposed and corresponding flight tests are designed performed with a simulator. Firstly, the least square method is used to determine the baseline aerodynamic model from simulated flight test data. Then landing gear extension and retraction maneuver are conducted on the same simulator under quasi-steady conditions to acquire the increment of aerodynamic coefficients caused by the change of landing gear position. Thus, the nonlinear aerodynamic model considering the effect of landing gear can be obtained. Based on the above method, flight tests using a simulated Boeing 737-800 model is carried out, and nonlinear landing gear aerodynamic characteristics of the 737-800 model is acquired. Compared with the linear interpolation model, the fidelity of the nonlinear landing gear aerodynamic model proposed in this work is obviously improved.
      PubDate: 2024-07-27
       
  • Improved Design of Beach Ball Constellation for Constant Revisit Time in
           LEO Reconnaissance

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      Abstract: Abstract Recent conflicts, such as the Ukrainian war, highlight the need for advanced surveillance methods. Small satellite constellations present cost-effective solutions for surveillance missions. In light of the increasing significance of cross-border intelligence surveillance, this paper addresses the design of beach ball (BB) constellations optimized for reconnaissance missions in low Earth orbit (LEO). Unlike previous empirical methods, we propose a mathematical approach to design a BB constellation, ensuring stable and constant monitoring of a specific Area of Interest. We considered dominant \({J}_{2}\) perturbation in LEO, allowing satellites to pass over designated observation points with consistent revisit times. The paper provides a comprehensive overview of BB constellation design, including background on sun-synchronous orbits and ground repeat tracks. Additionally, we introduce a collision inspection method and strategies for collision avoidance, enhancing operational safety.
      PubDate: 2024-07-27
       
  • Relative Navigation Performance of LEO Vehicles Considering GPS–KPS
           Constellation and Measurement Characteristics

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      Abstract: Abstract This paper proposes a method for relative navigation between two satellites in low-earth orbit (LEO) using the global positioning system (GPS) and Korean positioning system (KPS). The extended Kalman filter (EKF) is designed using pseudorange and Doppler single differences from GPS and KPS, as well as inter-satellite link measurements. The designed EKF accurately estimates relative position, velocity, receiver clock biases, and drift. Measurement noise at a level suitable for the space environment and process noise based on the stability specifications of the receiver clock are modeled. The effectiveness of the proposed method is validated through simulations, and the results of relative navigation based on GPS, a mid-Earth orbit constellation, and KPS-based relative navigation, a geosynchronous orbit constellation, were analyzed. The relative position error showed a precision of cm level, and the relative velocity error showed a precision of mm/s level. The proposed algorithm can effectively estimate the relative position and velocity between two satellites in LEO.
      PubDate: 2024-07-26
       
  • Comparative Analysis of Inerting Effects of Open and Closed Vent Systems
           Fuel Tanks

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      Abstract: Abstract The ability to suppress fuel tank ignition and explosion is related to passenger safety and aircraft survivability. To enhance aircraft fuel tank safety, the on-board fuel tank inerting technology is applied to reduce the probability of fuel tank ignition and explosion, whether the fuel tank has open or closed vent system. This paper takes the single-bay fuel tank of a certain type of aircraft as the research object, establishes mathematical models of the inerting process of open and closed vent systems fuel tanks, and writes programs to carry it out based on MATLAB R2019b combined with the numerical calculation method of microelement integration according to the actual on-board hollow fiber membrane separation performance. On this basis, this paper analyzes the variation of oxygen concentration in the ullage of open and closed vent systems fuel tanks, compares their advantages and disadvantages, and explores the influence of factors on the inerting effect, such as initial oxygen concentration, fuel loading, aeration pressure, and valve diameter. The results show that for the same nitrogen-enriched air (NEA) flow rate and concentration, the inerting effect of the closed vent system fuel tank is better than the open vent system fuel tank, which can better meet the airworthiness regulations requirements on the flammability exposure time. The initial fuel loading and oxygen concentration have a more significant effect on the initial stage of inerting. Within the range of the vent valve diameters considered in this study, any appreciable difference in the oxygen concentration behavior could not be identified. When the tank pressure conditions permit, it is recommended to use a larger valve threshold to better utilize the good inerting effect of the closed vent system fuel tank.
      PubDate: 2024-07-26
       
  • Optimization of RAIM Based on Dual-Frequency Dual-Constellation INS
           Integrated Navigation System

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      Abstract: Abstract The development of the global navigation satellite system (GNSS) has enabled the implementation of receiver autonomous integrity monitoring (RAIM) for precision approach with vertical guidance in civil aviation. Considering the most challenging threat—constellation-wide threat, an integrity monitoring system for dual-frequency dual-constellation (DFDC)/inertial navigation system (INS) integrated navigation is designed. To enhance integrity performance, we employ the augmented state method for nominal unmodeled bias in pseudo-range measurement and the optimal allocation method for continuity budget. Based on civil aviation standards requirements, the vertical protection level (VPL) availability distribution and static station experiment are presented for different integrity monitoring algorithms. The simulations demonstrate that the constellation-wide threat significantly affects integrity performance, and DFDC/INS integrity monitoring significantly improves integrity performance compared to the single-constellation solution. Furthermore, for the VPL availability, the augmented state method and optimization of allocation method increase the availability percentage by 3.08 and 3.59% and average VPL by 5.62 and 5.13 m, respectively. Finally, for the static station, vertical accuracy and effective monitor threshold (EMT) satisfy the localizer performance with vertical guidance down to 200 feet (LPV-200) requirements for civil aviation.
      PubDate: 2024-07-25
       
  • Thermal–Structural Coupled Analysis and Design of a Reentry Capsule with
           Ablative Thermal Protection Systems

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      Abstract: Abstract Reentry capsules are exposed to extreme aerodynamic heating during their return to Earth, experiencing up to 15 MW/m2 of heat flux on their surfaces. Therefore, thermal protection system (TPS) that utilize ablative materials capable of effectively dissipating heat through ablation and charring are necessary. In this study, an initial configuration comprising TPS, substructure, and box was designed. Design requirements were established by considering the temperature limitations of the payloads, degradation of the effective properties due to pyrolysis of the TPS, and yield strength of the substructure. Based on the initial configuration, three models were constructed by varying the TPS thickness, and thermal–structural coupled analysis was conducted by considering the reentry trajectory. The thickness that satisfied the thermal design requirements was selected, and the stress results of the substructure were evaluated. The internal geometry was modified to relieve stress concentration and provide an additional thickness margin for unpredictable mechanical ablation. Thus, all design requirements were satisfied, ensuring thermal protection performance and structural safety. The thermal–structural coupled analysis and design procedure proposed in this study were confirmed to ensure the reliable design of reentry vehicles.
      PubDate: 2024-07-23
       
  • Genetic Algorithm-Based Approach for Improving Temporal Resolution in
           Constellation Operation of National Satellites

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      Abstract: Abstract The application of satellite information refers to the utilization of data generated by operational satellites that have been launched into orbit. Due to the recent rapid increase in the number of satellites in space, satellite information is growing exponentially. This growth underscores the necessity of finding effective ways to utilize this wealth of satellite data. In particular, it is anticipated that the number of individually developed national satellites will continue to rise, making it imperative to establish efficient methods for the fusion and application of satellite information through the configuration of satellite constellations and integrated operations of national satellites. In this paper, we propose a method to improve temporal resolution by employing a genetic algorithm for efficient fusion and application of satellite information. Additionally, we present a method for configuring national satellite constellations by adjusting the revisit times of operational satellites using the previously mentioned method. To mitigate the potential shortening of the lifespan of currently operational satellites due to fuel consumption, we altered the orbits of future satellites slated for launch. We also made adjustments to the Right Ascension of the Ascending Node (RAAN), a parameter that has minimal impact on payload. We conducted separate analyses for Electro Optical (EO) and Synthetic Aperture Radar (SAR) satellites, each with different imaging schedules. Our findings confirmed that it is possible to configure constellations of national satellites by modifying the revisit characteristics of both types of satellites.
      PubDate: 2024-07-23
       
  • An Investigation on V-Notch Controlled Asymmetric Supersonic Jet

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      Abstract: Abstract The major disadvantages associated with high-speed aircraft are the larger supersonic core and the intense noise from the supersonic plume ejected from the aircraft exit which can be mitigated by the controlled manipulation of the supersonic jet core. This essentially can be achieved by the introduction of vortex generators at the exit of the supersonic nozzle. The present study investigates the influence of V-notch and plain tabs types of vortex generators, placed at the exit of a supersonic elliptical nozzle, aiming to improve mixing efficiency, reduce the core length, and thereby decrease aeroacoustic noise from the supersonic asymmetric jet. Particularly, the innovative V-notch design has been introduced as it introduces mixed-size mixing promoting vortices due to its unique varying shape from the base, which is effective in jet mixing. The experimental investigations have been conducted in a supersonic jet test facility to analyze the performance of a Mach 1.6 elliptic jet under different nozzle pressure ratios (NPRs). The elliptical nozzle, along with plain tabs and V-Notch, is examined through centerline Pitot pressure measurements, radial Pitot pressure profiles, and Schlieren images. The results from the centerline Pitot pressure distributions demonstrate that the V-notch has a superior capability in reducing potential core length, with reductions of 72.62% at NPR 6, 64% at NPR 4.25, and 62.5% at NPR 2.5 which is much better than the performance with plain tabs. This essentially indicates effective jet mixing due to the ability of V-notch to induce diverse sizes of vortices. Schlieren images further support the superior performance of V-notch in reducing shock cell length compared to plain tabs controlled and uncontrolled jets. Essentially, the varying size of vortices shed from the V-notch are very effective in demonstrating its superior mixing of controlled elliptic jet over plain tab which makes V-notch a promising element for optimizing asymmetric jet flow characteristics in aerospace engineering applications.
      PubDate: 2024-07-22
       
 
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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 124 journals)
Showing 1 - 30 of 30 Journals sorted by number of followers
AIAA Journal     Hybrid Journal   (Followers: 1126)
SpaceNews     Free   (Followers: 860)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 791)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 720)
Aviation Week     Full-text available via subscription   (Followers: 464)
Aerospace Science and Technology     Hybrid Journal   (Followers: 387)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 369)
Advances in Space Research     Hybrid Journal   (Followers: 365)
Control Systems     Hybrid Journal   (Followers: 318)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 309)
Journal of Aircraft     Hybrid Journal   (Followers: 305)
Acta Astronautica     Hybrid Journal   (Followers: 293)
Gyroscopy and Navigation     Hybrid Journal   (Followers: 265)
Journal of Navigation     Hybrid Journal   (Followers: 239)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 239)
Aircraft Engineering and Aerospace Technology     Hybrid Journal   (Followers: 204)
Space Science International     Open Access   (Followers: 193)
Space Science Reviews     Hybrid Journal   (Followers: 92)
Propulsion and Power Research     Open Access   (Followers: 92)
International Journal of Aerospace Engineering     Open Access   (Followers: 82)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 79)
Advances in Aerospace Engineering     Open Access   (Followers: 79)
Aerospace     Open Access   (Followers: 74)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 60)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 53)
Space Safety Magazine     Free   (Followers: 49)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 48)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 45)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 42)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 36)
International Journal of Aerospace Sciences     Open Access   (Followers: 34)
Space Policy     Hybrid Journal   (Followers: 31)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 30)
Journal of Aeronautics & Aerospace Engineering     Open Access   (Followers: 30)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 29)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 29)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 29)
Journal of Space Weather and Space Climate     Open Access   (Followers: 29)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 28)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 27)
Nonlinear Dynamics     Hybrid Journal   (Followers: 26)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 25)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 24)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 24)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 22)
Artificial Satellites     Open Access   (Followers: 22)
Frontiers in Aerospace Engineering     Open Access   (Followers: 21)
Chinese Journal of Aeronautics     Open Access   (Followers: 20)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 20)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 20)
International Journal of Space Structures     Full-text available via subscription   (Followers: 19)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 19)
Fatigue of Aircraft Structures     Open Access   (Followers: 17)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
Advances in Aerospace Science and Technology     Open Access   (Followers: 17)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 13)
Aeronautical Journal, The     Hybrid Journal   (Followers: 13)
International Journal of Micro Air Vehicles     Open Access   (Followers: 12)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 12)
Aviation     Open Access   (Followers: 12)
Journal of Airline and Airport Management     Open Access   (Followers: 12)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 12)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 12)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 11)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 11)
Aerospace Systems     Hybrid Journal   (Followers: 11)
Population Space and Place     Hybrid Journal   (Followers: 10)
Journal of Aerospace Technology and Management     Open Access   (Followers: 10)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 10)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 9)
Journal of Aeronautical Materials     Open Access   (Followers: 9)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 8)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 8)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal   (Followers: 8)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 7)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 7)
Aerospace technic and technology     Open Access   (Followers: 7)
Air Medical Journal     Hybrid Journal   (Followers: 6)
Space and Polity     Hybrid Journal   (Followers: 6)
International Journal of Aviation Management     Hybrid Journal   (Followers: 6)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 6)
New Space     Hybrid Journal   (Followers: 6)
Journal of Astrobiology & Outreach     Open Access   (Followers: 6)
RocketSTEM     Free   (Followers: 6)
Civil Aviation High Technologies     Open Access   (Followers: 6)
Astrodynamics     Hybrid Journal   (Followers: 6)
Cosmic Research     Hybrid Journal   (Followers: 5)
International Journal of Hypersonics     Full-text available via subscription   (Followers: 5)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
Transport and Aerospace Engineering     Open Access   (Followers: 5)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 5)
Journal of Spatial Science     Hybrid Journal   (Followers: 4)
Unmanned Systems     Hybrid Journal   (Followers: 4)
Life Sciences in Space Research     Hybrid Journal   (Followers: 4)
Advances in Astronautics Science and Technology     Hybrid Journal   (Followers: 4)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 4)
Perspectives of Earth and Space Scientists i     Open Access   (Followers: 4)
Gravitational and Space Research     Open Access   (Followers: 4)
Microgravity Science and Technology     Hybrid Journal   (Followers: 3)
ASTRA Proceedings     Open Access   (Followers: 3)
npj Microgravity     Open Access   (Followers: 3)
Ciencia y Poder Aéreo     Open Access   (Followers: 3)
Open Aerospace Engineering Journal     Open Access   (Followers: 3)
Transactions on Aerospace Research     Open Access   (Followers: 3)
Xibei Gongye Daxue Xuebao / Journal of Northwestern Polytechnical University     Open Access   (Followers: 3)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 2)
MAD - Magazine of Aviation Development     Open Access   (Followers: 2)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
Spatial Information Research     Hybrid Journal   (Followers: 2)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 2)
Mekanika : Jurnal Teknik Mesin i     Open Access   (Followers: 2)
Investigación Pecuaria     Open Access   (Followers: 2)
Вісник Національного Авіаційного Університету     Open Access   (Followers: 1)

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JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
 


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