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  Subjects -> AERONAUTICS AND SPACE FLIGHT (Total: 123 journals)
Showing 1 - 30 of 30 Journals sorted alphabetically
Acta Astronautica     Hybrid Journal   (Followers: 497)
Advances in Aerospace Engineering     Open Access   (Followers: 70)
Advances in Aerospace Science and Technology     Open Access   (Followers: 8)
Advances in Astronautics Science and Technology     Hybrid Journal   (Followers: 1)
Advances in Space Research     Full-text available via subscription   (Followers: 458)
Aeronautical Journal, The     Hybrid Journal   (Followers: 13)
Aerospace     Open Access   (Followers: 60)
Aerospace Medicine and Human Performance     Full-text available via subscription   (Followers: 19)
Aerospace Science and Technology     Hybrid Journal   (Followers: 429)
Aerospace Scientific Journal     Open Access   (Followers: 18)
Aerospace Systems     Hybrid Journal   (Followers: 6)
Aerospace technic and technology     Open Access   (Followers: 3)
Aerotecnica Missili & Spazio : Journal of Aerospace Science, Technologies & Systems     Hybrid Journal   (Followers: 4)
AIAA Journal     Hybrid Journal   (Followers: 1195)
Air Force Magazine     Full-text available via subscription   (Followers: 10)
Air Medical Journal     Hybrid Journal   (Followers: 8)
Aircraft Engineering and Aerospace Technology     Hybrid Journal   (Followers: 262)
Annual of Navigation     Open Access   (Followers: 22)
Artificial Satellites     Open Access   (Followers: 23)
ASTRA Proceedings     Open Access   (Followers: 3)
Astrodynamics     Hybrid Journal   (Followers: 4)
Aviation     Open Access   (Followers: 17)
Aviation Advances & Maintenance     Open Access   (Followers: 5)
Aviation in Focus - Journal of Aeronautical Sciences     Open Access   (Followers: 10)
Aviation Psychology and Applied Human Factors     Hybrid Journal   (Followers: 27)
Aviation Week     Full-text available via subscription   (Followers: 438)
Canadian Aeronautics and Space Journal     Full-text available via subscription   (Followers: 34)
CEAS Aeronautical Journal     Hybrid Journal   (Followers: 30)
Chinese Journal of Aeronautics     Open Access   (Followers: 21)
Ciencia y Poder Aéreo     Open Access   (Followers: 2)
Civil Aviation High Technologies     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 316)
Cosmic Research     Hybrid Journal   (Followers: 5)
COSPAR Colloquia Series     Full-text available via subscription   (Followers: 11)
Egyptian Journal of Remote Sensing and Space Science     Open Access   (Followers: 24)
Elsevier Astrodynamics Series     Full-text available via subscription   (Followers: 12)
Fatigue of Aircraft Structures     Open Access   (Followers: 15)
Frontiers in Astronomy and Space Sciences     Open Access   (Followers: 12)
Gravitational and Space Research     Open Access  
Gyroscopy and Navigation     Hybrid Journal   (Followers: 258)
IEEE Aerospace and Electronic Systems Magazine     Full-text available via subscription   (Followers: 278)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 385)
IEEE Transactions on Circuits and Systems I: Regular Papers     Hybrid Journal   (Followers: 39)
International Journal of Aeroacoustics     Hybrid Journal   (Followers: 41)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 37)
International Journal of Aeronautical and Space Sciences     Hybrid Journal   (Followers: 2)
International Journal of Aerospace Engineering     Open Access   (Followers: 82)
International Journal of Aerospace Psychology     Hybrid Journal   (Followers: 23)
International Journal of Aerospace Sciences     Open Access   (Followers: 32)
International Journal of Applied Geospatial Research     Hybrid Journal   (Followers: 7)
International Journal of Aviation Management     Hybrid Journal   (Followers: 9)
International Journal of Aviation Technology, Engineering and Management     Full-text available via subscription   (Followers: 7)
International Journal of Aviation, Aeronautics, and Aerospace     Open Access   (Followers: 5)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 12)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 11)
International Journal of Satellite Communications Policy and Management     Hybrid Journal   (Followers: 13)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 11)
International Journal of Space Structures     Full-text available via subscription   (Followers: 17)
International Journal of Space Technology Management and Innovation     Full-text available via subscription   (Followers: 10)
International Journal of Sustainable Aviation     Hybrid Journal   (Followers: 5)
International Journal of Turbo and Jet-Engines     Hybrid Journal   (Followers: 6)
Investigación Pecuaria     Open Access   (Followers: 3)
Journal of Aerodynamics     Open Access   (Followers: 18)
Journal of Aeronautical Materials     Open Access   (Followers: 9)
Journal of Aeronautics & Aerospace Engineering     Open Access   (Followers: 31)
Journal of Aerospace Engineering     Full-text available via subscription   (Followers: 69)
Journal of Aerospace Engineering & Technology     Full-text available via subscription   (Followers: 18)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 22)
Journal of Aerospace Information Systems     Hybrid Journal   (Followers: 34)
Journal of Aerospace Technology and Management     Open Access   (Followers: 7)
Journal of Aircraft     Hybrid Journal   (Followers: 335)
Journal of Aircraft and Spacecraft Technology     Open Access   (Followers: 9)
Journal of Airline and Airport Management     Open Access   (Followers: 12)
Journal of Astrobiology & Outreach     Open Access   (Followers: 3)
Journal of Aviation Technology and Engineering     Open Access   (Followers: 11)
Journal of Aviation/Aerospace Education & Research     Open Access   (Followers: 2)
Journal of Engineering and Technological Sciences     Open Access   (Followers: 1)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 204)
Journal of KONBiN     Open Access   (Followers: 3)
Journal of Navigation     Hybrid Journal   (Followers: 280)
Journal of Propulsion and Power     Hybrid Journal   (Followers: 615)
Journal of Space Safety Engineering     Hybrid Journal   (Followers: 8)
Journal of Space Weather and Space Climate     Open Access   (Followers: 27)
Journal of Spacecraft and Rockets     Hybrid Journal   (Followers: 774)
Journal of Spatial Science     Hybrid Journal   (Followers: 3)
Journal of the American Helicopter Society     Full-text available via subscription   (Followers: 8)
Journal of the Astronautical Sciences     Hybrid Journal   (Followers: 9)
Journal of the Australasian Society of Aerospace Medicine     Open Access   (Followers: 1)
Journal of Wind Engineering and Industrial Aerodynamics     Hybrid Journal   (Followers: 17)
Life Sciences in Space Research     Hybrid Journal   (Followers: 4)
MAD - Magazine of Aviation Development     Open Access   (Followers: 2)
Mekanika : Jurnal Teknik Mesin i     Open Access   (Followers: 1)
Microgravity Science and Technology     Hybrid Journal   (Followers: 2)
New Space     Hybrid Journal   (Followers: 6)
Nonlinear Dynamics     Hybrid Journal   (Followers: 20)
npj Microgravity     Open Access   (Followers: 3)
Open Aerospace Engineering Journal     Open Access   (Followers: 1)
Perspectives of Earth and Space Scientists i     Open Access  
Population Space and Place     Hybrid Journal   (Followers: 9)
Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa / Problems of Mechatronics. Armament, Aviation, Safety Engineering     Open Access   (Followers: 3)
Proceedings of the Human Factors and Ergonomics Society Annual Meeting     Hybrid Journal   (Followers: 16)
Proceedings of the Institution of Mechanical Engineers Part G: Journal of Aerospace Engineering     Hybrid Journal   (Followers: 46)
Progress in Aerospace Sciences     Full-text available via subscription   (Followers: 81)
Propulsion and Power Research     Open Access   (Followers: 68)
REACH - Reviews in Human Space Exploration     Full-text available via subscription   (Followers: 5)
Research & Reviews : Journal of Space Science & Technology     Full-text available via subscription   (Followers: 17)
RocketSTEM     Free   (Followers: 6)
Russian Aeronautics (Iz VUZ)     Hybrid Journal   (Followers: 24)
Science and Education : Scientific Publication of BMSTU     Open Access   (Followers: 1)
Space and Polity     Hybrid Journal   (Followers: 4)
Space Policy     Hybrid Journal   (Followers: 29)
Space Research Today     Full-text available via subscription   (Followers: 48)
Space Safety Magazine     Free   (Followers: 51)
Space Science International     Open Access   (Followers: 201)
Space Science Reviews     Hybrid Journal   (Followers: 97)
SpaceNews     Free   (Followers: 826)
Spatial Information Research     Hybrid Journal   (Followers: 1)
Technical Soaring     Full-text available via subscription   (Followers: 1)
Transport and Aerospace Engineering     Open Access   (Followers: 1)
Transportmetrica A : Transport Science     Hybrid Journal   (Followers: 9)
Unmanned Systems     Hybrid Journal   (Followers: 5)
Xibei Gongye Daxue Xuebao / Journal of Northwestern Polytechnical University     Open Access  
Вісник Національного Авіаційного Університету     Open Access   (Followers: 2)

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Similar Journals
Journal Cover
Aerospace Systems
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2523-3947 - ISSN (Online) 2523-3955
Published by Springer-Verlag Homepage  [2657 journals]
  • Verification and test case development method based on civil aircraft
           operation scenario
    • Abstract: Due to the characteristics of civil aircraft system integration, requirement-based testing cannot fully verify the complex cross-linking between multiple systems. With the gradual deepening of research on flight process in recent years, method of verification based on scenarios has been applied to test verification process of civil aircraft. This paper studies the verification process based on typical operation scenarios of civil aircraft. A method for establishing behavior model of operation scenario based on SysML is proposed. The model covers key parameters and behavior information of scenario which can support closed-loop simulation of aircraft. In addition, the method of generating test cases based on SysML model is optimized, and a set of use cases suitable for scenario-based testing is formed through the combination of test data and path. This paper takes the ground proximity warning function verification scenario as an example to show the method of scenario modeling and test case development, which can be applied to test verification process of operation scenario, and supports the closed-loop simulation and testing.
      PubDate: 2021-05-10
       
  • Terminal sliding mode velocity control of the electro-hydraulic actuator
           with lumped uncertainty
    • Abstract: A terminal sliding mode control (TSMC) strategy is used in the velocity control of electro-hydraulic actuator (EHA) to improve the output response performance. Based on the terminal sliding mode technique, a disturbance observer is designed to estimate the lumped uncertainty of EHA including hydraulic parametric uncertainty and unknown external load. Different from asymptotic convergence controller, the TSMC guarantees the system state error and observer estimation error converge to zero in a finite time. The effectiveness of the proposed controller is verified by simulation results with comparisons the other controllers.
      PubDate: 2021-05-03
       
  • End-of-life geostationary satellite removal using realistic flat solar
           sails
    • Abstract: This paper proposes an analytical solution of removing end-of-life GEO satellites to the GEO graveyard region using realistic flat solar sails. Different from the ideal solar sail model, the proposed realistic flat solar sail model applies the realistic solar sail thrust model, and the sail cone angle is constrained within \([0^{\circ },85^{\circ }]\) . The dynamic system of a GEO satellite equipped with a realistic flat solar sail is constructed based on the Gauss’s variation of parameter (VOP) equations, and linearized along a nominal trajectory. Control angles of the sail are generated using the linear optimal tracking controller. Iterations of linearization are applied to gradually reduce the inaccuracy of the linearized systems, thus reducing the terminal state error. Simulations indicate that, end-of-life GEO satellites are successfully removed to the GEO graveyard region in 350 days using the proposed control approach. The negative impact of using realistic flat solar sails in the end-of-life GEO satellite removal mission is evident but not significant. Compared to using ideal solar sails, a small increase in the A/m of spacecraft from 0.14 to \(0.16\ \mathrm{kg}/\mathrm{m}^2\) is required.
      PubDate: 2021-04-19
       
  • Development turbine air-cooling system of GTE to increase its operating
           parameters
    • Abstract: The results researching of structural schemes cooling for turbines of aircraft bypass gas turbine engines are presented. A new scheme of supplying cooling air to the high-pressure turbine working blades is proposed. The front cavity of the nozzle and rotor blades is cooled continuously, regardless of the engine’s operating mode. The air for cooling the working blade of the high-pressure turbine is supplied by the transit tube through the vane from the cavity, which is located in front of the place where is supply locking, which ensures constant boost of the blade front cavity. To eliminate the heating from the turbine disk and centrifugal pumping, the swirling device is installed directly under the blade lock, where the supply of cooling air to the cavity is organized. The turbine disk is cooled by the second row of swirling device with air taken from the secondary zone of the combustion chamber. The swirling devices rows are separated by brush seal and labyrinth. The higher efficiency of the brushes, the location of the swirling device cooling the disk under the labyrinth in the upper part of the disk, the decrease in the number of labyrinth teeth and, as a result, the pressure drop across the labyrinth between the disk cooling cavity and the dummy cavity eliminates heating air cooling blade because the main part of the hotter air is to be directed down the disk and, further, along the shaft of the high-pressure rotor into the dummy cavity.
      PubDate: 2021-04-16
       
  • Design and computational fluid dynamics analysis of bio-inspired non
           slender cropped delta wingsuit
    • Abstract: This study examines the effect of bio-inspired serrations on aerodynamic performance of a Non Slender cropped delta wingsuit model. In this study, Gottingen 228 aerofoil is used for designing the wingsuit model having AR of 1.00 using CAD software Solidworks. Ansys Fluent solver has been utilised to solve the Reynolds Averaged Navier–Stokes (RANS) equations with a k− \(\omega\) turbulence model. The flow velocity was kept at 45 m/s with Re ~ 2.6 × 106 and angle of attack was varied from 0° to 45°. Computations revealed that the wingsuit with serrations in comparison with clean basemodel had a notable increase in maximum lift coefficient. The results were compared with the experimental and CFD results of existing literature in the open domain. The serrated non slender delta wingsuit performs extremely well giving a lift coefficient of 2.74 and \(C_{{\text{L}}}\) / \(C_{{\text{D}}}\) of 9.72. The results were validated by comparing them with flat plate and non slender cropped delta wing results available in the existing literature. A good agreement in terms of trends was obtained for \(C_{{\text{L}}}\) and \(C_{{\text{D}}}\) which indicates that proposed wingsuit should perform well aerodynamically under typical wingsuit flying conditions.
      PubDate: 2021-04-07
       
  • Recursive optimal linear attitude estimator based on star sensor and gyro
    • Abstract: The optimal linear attitude estimation algorithm takes Rodrigues parameters as the attitude description, which has advantages of small computation volume and high accuracy. Based on the optimal linear attitude estimation algorithm, this article proposes a recursive optimal linear attitude estimator based on star sensor and gyro, introducing historical data and gyro data for auxiliary attitude determination. The fading memory factor is introduced to balance historical and current measurement data. Numerical simulation results show that the proposed algorithm has a higher accuracy than that of Quaternion Estimator (QUEST) and single frame method Linear Attitude Estimation (LAE). The analysis at different angular velocities shows that the algorithm has a wide range of adaptation to angular velocities and can be widely used in engineering tasks.
      PubDate: 2021-03-22
       
  • Multiband image fusion using total generalized variation regularization
    • Abstract: Multiband image fusion has become a thriving area of research in a number of different fields, such as space robotics, and remote sensing, etc. Many multiband image fusion methods have been proposed for hyperspectral sharpening with panchromatic images, hyperspectral sharpening with multispectral images and panchromatic images, etc. Despite the different motivations, we observe that many existing methods possibly lead to over-smooth regions. In this work, we consider a new problem formulation of two image fusion problems. A novel fusion model with total generalized variation regularization term is proposed, where the fusion process is performed on hybrid gradient domains. The optimization framework of alternating direction multiplier of method is used to solve the resulting problem. In an extensive evaluation, our method outperforms some state-of-the-art methods.
      PubDate: 2021-03-04
      DOI: 10.1007/s42401-020-00075-6
       
  • Attitude control strategy of airship based on active disturbance rejection
           controller
    • Abstract: The flight performance of the airship is closely related to the attitude control. For the stability of the station-keeping and the rapidity and accuracy of the trajectory tracking, it is necessary to study the attitude control of the airship. This paper proposes a strategy including two parties. First, a novel control mechanism combining moving-mass and tail vector thrust is proposed, and the airship mathematical model is introduced briefly. Second, active disturbance rejection controller (ADRC) is introduced which is developed from classical proportion–integration–differentiation (PID) controller. Considering the special working environment of stratospheric airship, the wind field is added to the simulation as external disturbance. The results show that the system is stable which can track any expected angle of pitch and yaw directions with small overshoot and rise time. In general, with or without the disturbance of 4 m/s wind field, the ADRC performs better than PID controller.
      PubDate: 2021-03-01
      DOI: 10.1007/s42401-020-00058-7
       
  • Characterization and mitigation of multipath fading on multi-frequency
           GNSS signals in urban environment
    • Abstract: The global navigation satellite systems (GNSS) receiver is likely to experience performance degradation in the presence of multipath interferences in indoor and urban canyon environments. There will be multiple reflected signals arriving at the receiver antenna from different paths and directions regarding the different locations of the nearby constructions, causing significant fluctuations and distortions on the amplitude and phase of the direct signals. This is the so-called multipath fading effects and usually exhibit with the random features of temporal, spatial, and frequency diversity across the signal bands. To have a better understanding of the multipath fading effects, a live test was conducted near Lujiazui CBD area in Shanghai. The collected data were processed to characterize the signal attenuations and phase fluctuations on multi-frequency GNSS signals via the detrend code delay, carrier phase, and navigation bit errors. The resulting scintillation index on amplitude, code delay, and carrier phase, e.g., S4, \({\sigma }_{\varphi }\) and \({\sigma }_{\tau }\) can be calculated. Based on these multipath features, the inter-frequency aiding strategy will be utilized for the multipath mitigations in the multi-frequency tracking loop design. The results demonstrate the effectiveness of the multi-frequency tracking algorithm in the urban environment.
      PubDate: 2021-03-01
      DOI: 10.1007/s42401-020-00068-5
       
  • Spatio-temporal graph convolutional neural network for remaining useful
           life estimation of aircraft engines
    • Abstract: Accurate remaining useful life (RUL) estimation is crucial for the maintenance of complex systems, e.g. aircraft engines. Thanks to the popularity of sensors, data-driven methods are widely used to evaluate RULs of systems especially deep learning approaches. Though remarkably capable at non-linear modeling, deep learning-based prognostics techniques lack powerful spatio-temporal learning ability. For instance, convolutional neural networks are restricted to only process grid structures rather than general domains, recurrent neural networks neglect spatial relations between sensors and suffer from long-term dependency learning. To solve these problems, we construct a graph structure on sensor network with Pearson Correlation Coefficients among sensors and propose a method for combining the power of graph convolutional network on spatial learning and sequence learning success of temporal convolutional networks. We conduct the proposed method on aircraft engine dataset provided by NASA. The experimental results demonstrate that the established graph structure is appropriate and the proposed approach can model spatio-temporal dependency accurately as well as improve the performance of RUL estimation.
      PubDate: 2021-03-01
      DOI: 10.1007/s42401-020-00070-x
       
  • Adaptive fading factor unscented Kalman filter with application to target
           tracking
    • Abstract: One purpose of target tracking is to estimate the states of targets, and unscented Kalman filter is one of the effective algorithms for estimating in the nonlinear tracking problem. Considering the characteristics of complex maneuverability, it is easy to reduce the tracking accuracy and cause divergence due to the mismatch between the system model and the practical target motion model. Adaptive fading factor is an effective counter to this problem, having been instrumental in solving accuracy and divergence problems. Fading factor can adaptively adjust covariance matrix online to compensate model mismatch error. Moreover, fading factor not only improves the filtering accuracy, but also automatically adjusts the error covariance in response to the different situation. The simulation results show that the adaptive fading factor unscented Kalman filter has more advantages in target tracking and it can be better applied to nonlinear target tracking.
      PubDate: 2021-03-01
      DOI: 10.1007/s42401-020-00071-w
       
  • Substantiation of choosing rational appearance of nose of aircraft with
           the use of mathematical modeling
    • Abstract: As part of this work, a comprehensive analysis of the question of ensuring the specified aerodynamic performance of the aircraft required to implement a cruising supersonic flight at M ~ 1.5. B Analysis of possible methods of aerodynamic performance evaluation (AP) of aircraft components in the course of optimization of their geometrical parameters to achieve a minimum contribution to the AP. The paper presents an algorithm for the formation of the nose part of the aircraft of minimal aerodynamic resistance, and also selects criteria for evaluation of the nose part of the aircraft as an element of the glider, which has a significant contribution to the overall aircraft AP at a flight speed of \(M>1\) . The results of this work can be used at the early stages of aircraft tying up to reduce the time required for the formation of a mathematical model of the surface of a prospective aircraft.
      PubDate: 2021-02-22
      DOI: 10.1007/s42401-020-00079-2
       
  • PBN operation advantage analysis over conventional navigation
    • Abstract: With the development of global economy and the rapid growth of people's material demand, the sustainable development of air industry needs more and more airspace capacity, so the importance of optimizing available airspace is prominent. Under the background of world aviation industry, after more than 60 years development, the safety level has steadily improved, the total amount of transportation has increased rapidly, the air routes have been enriched and the air traffic capacity has gradually improved. PBN, the performance-based navigation technology is one of the most essential topics in China’s aviation development. Compared to conventional navigation, it has witnessed significant benefit in PBN operation, such as less fuel cost, shorter route range and lighter workload of the controllers. This paper introduces the basic concept of PBN, and then selects three typical routes through simulation software, compares the characteristics of PBN and traditional navigation in practice, and illustrates the advantages of PBN procedures by means of data and charts.
      PubDate: 2021-02-19
      DOI: 10.1007/s42401-021-00084-z
       
  • An enhanced situational awareness design for airborne surveillance based
           on Automatic Dependent Surveillance–Broadcast
    • Abstract: With the fast growth of general aviation, Automatic Dependent Surveillance–Broadcast (ADS-B) becomes the direction of airspace surveillance development. The previous researches in surveillance field have managed to use ADS-B data to improve the performance of the integrated surveillance system, yet they have failed to consider ADS-B as a major source of data and will not be applicable when the general aviation is growing fast. The research of this paper proposes an enhanced situational awareness design based on ADS-B. With elective fusion based on surveillance quality, it helps to improve the performance when ADS-B data are taken as a major source of surveillance data. Several simulation scenarios with different surveillance quality are tested. The results show that the error is reduced and the overall surveillance performance is improved when surveillance quality is low. An integrated display is built for enhanced situational awareness display afterwards. With this enhanced situational awareness design, the pilots can be provided with a more comprehensive awareness of the airspace including general aviation aircrafts.
      PubDate: 2021-02-01
      DOI: 10.1007/s42401-020-00081-8
       
  • Harmonic balance analysis and simulations of spacecraft rendezvous and
           formation flying dynamics
    • Abstract: In this paper, approximated nonlinear spacecraft relative motion model is developed via Euler Lagrange approach using local vertical–local horizontal frame attached to the chief spacecraft. Harmonic balance analysis approach, a powerful technique for approximating nonlinear equation and generating periodic solutions, is applied to the approximated nonlinear relative motion for the development of new linear harmonic balance approximation model and investigation of its periodic solutions. Using power series method, power series approximate solutions of the harmonically balanced model of the relative motion are developed. Furthermore, the computational algorithm employed for the orbit propagation of nonlinear, harmonic balance and Clohessy–Wilshire models is presented. Using MATLAB ODE45 integrator, the relative motion models are numerically integrated and propagated. The numerical results show that harmonic balance model gave a better approximation of the nonlinear model.
      PubDate: 2021-02-01
      DOI: 10.1007/s42401-021-00083-0
       
  • Application of mathematical modeling to solve the emergency water landing
           task in the interests of passenger aircraft certification
    • Abstract: The article deals with issues related to the application of modeling in the interests of aircraft certification. The technique of numerical flood modeling based on the numerical solution of Navier–Stokes equations with a free surface is proposed. Verification of the technique was carried out on the tasks about water fluctuations in the tank under the action of gravity, cylinder movement in the liquid and ball drop in the liquid. In all cases, good convergence of simulation results with experimental data is shown. Validation of the method was performed on the task of sinking the vessel model with damage in the bottom and on board. Complex model hull movements were studied due to changing buoyancy properties as a result of water leakage inside the hull during the sinking. Comparison of calculated and experimental data shows their qualitative and quantitative consistency at the initial stage of the dive. By the example of modeling the flooding of the passenger aircraft model, the practical application of the developed method for certification is shown. It was found that at the initial moment of time after an unplanned landing on the water, the front and rear emergency exits are located above the waterline, and the buoyancy time of the aircraft is sufficient for its emergency exit.
      PubDate: 2021-02-01
      DOI: 10.1007/s42401-020-00082-7
       
  • Effect of tip injection on the flow characteristics of an aeroengine
           compressor rotor
    • Abstract: Existing experiments, simulations, and analysis have shown that the flow field of the blade tip has a significant effect on rotating stall and acoustic resonance in aeroengine compressors. Based on the numerical simulation of NASA rotor 37, the steady influence of air injection at blade tip was investigated in this investigation. The results show that the injected flow could obviously extend the stability margin of the axial compressor to varying degrees. The tip injection reduces the blockage caused by the tip leakage, and reduces the backflow in the trailing edge area of the blade tip, thereby delaying the occurrence of stall. Furthermore, in this paper, different types of rotors are constructed to verify the effect of injection parameters on the stability extension. The results show that the improvement of rotor stall margin is positively correlated with the injector inlet total pressure, and when the injector inlet flow conditions are of the same magnitude, the improvement of the rotor stall margin is negatively related to the distance between the injector and the leading edge of the blade.
      PubDate: 2021-01-14
      DOI: 10.1007/s42401-020-00078-3
       
  • Adaptive filter based on Monte Carlo method to improve the non-linear
           target tracking in the radar system
    • Abstract: This article deals with the problem of degraded tracking performance of a high non-linear target in a radar system, well known by the divergence phenomenon. In our study, we aim to improve the target state estimation to imitate the tracking scenario as well as avoid the last cited undesirable phenomenon, generated during the non-linear measurements filtering, once using extended KALMAN filter. To overcome this issue, we have implemented a new approach based on the adaptive Monte Carlo (AMC) algorithm to replace the traditional method as is known by the extended KALMAN filter (EKF). The obtained experimental results showed a challenging remediation. Where, the AMC converges towards the accurate state estimation. Thus, more efficient than extended KALMAN filter. The experimental results prove that the designed system meets the objectives set for AMC referring to an experimental database obtained by a radar system, using MATLAB software development framework.
      PubDate: 2021-01-14
      DOI: 10.1007/s42401-020-00080-9
       
  • Analysis and experimental study on different airfoils in heavy unmanned
           aerial vehicle
    • Abstract: The performance of airfoil plays an important role in the performance of model aircraft. Three types of airfoils are selected in this paper: the GOE 480, MH 114, and MH 115, which are all flat-convex airfoils. Firstly, three types of airfoil were numerically analyzed by using Profili software. The results show that among the three types of flat-convex airfoils, the lift-drag ratio of MH series airfoils is higher than that of GOE 480. Then, the FEA software was used to analyze the aerodynamic performance of the wings. And the lift and drag coefficient obtained from calculation was compared with the results by Profili software. To compare the actual flight performance of the three airfoils, the control variable method and UAV self speed measurement method based on sequence images were used for the real field test. The results show that the type of MH 115 has the largest max level speed among the three types of wings.
      PubDate: 2020-11-20
      DOI: 10.1007/s42401-020-00072-9
       
  • State-based safety analysis method for dynamic evaluation of failure
           effect
    • Abstract: System state that represents a combined influence of internal and external system parameters on the overall failure effect plays a significant role in failure effect analysis. The traditional safety analysis methods can hardly evaluate the overall failure impact due to the dynamic failure behaviors in diverse system interaction situations. To overcome this problem, this paper proposes a state-based safety analysis method for dynamic evaluation of the failure effect combining the situation factor. First, a hierarchical modeling framework that includes functional logic, physical architecture, and the failure mode is constructed, and then the cross-linking relationships between items are characterized by the state machines. Particularly, the event transmission mechanism and the global attribute updating mechanism are designed to realize the state synchronization of various systems, thus enabling the global propagation of failure. The feasibility of the proposed method is verified by simulations. The Enterprise Architect platform is used to model the aircraft integrated surveillance system and analyze the effects of different failure modes in typical situations. The proposed method complements the failure effect evaluation accuracy considering the dynamic interaction situations, thus realizing the global perception of the safety state, enhancing the dynamics and integrity of the failure effect analysis process.
      PubDate: 2020-11-19
      DOI: 10.1007/s42401-020-00073-8
       
 
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