Showing papers in "Aerospace Science and Technology in 2019"
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TL;DR: In this paper, a nonlinear vibration analysis of metal foam circular cylindrical shells reinforced with graphene platelets is performed, and the results demonstrate that GPL reinforced metal foam (GPLRMF) shells exhibit hardening-spring vibration characteristics.
259 citations
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TL;DR: A complete mathematical model of a quadrotor UAV is presented based on the Euler-Newton formulation and a robust nonlinear fast control structured for thequadrotor position and attitude trajectory tracking is designed.
196 citations
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TL;DR: It is concluded that the proposed controller provides the following main advantages: (1) good transient and steady state behaviors, (2) insensitivity to parameter variations, (3) disturbance rejection capability, and (4) remarkable stability and performance robustness.
158 citations
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TL;DR: This work investigates the challenging problem of fast robust fault tolerant attitude control for spacecraft to handle external disturbances, actuator failures and misalignments, and develops a novel nonsingular terminal sliding mode based finite-time extended state observer to estimate and compensate for the lumped system faults or uncertainties.
129 citations
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TL;DR: For each UAV, which is regarded as an agent, a distributed controller is proposed, which guarantees a fixed formation, which in turn achieves the main objective of cooperative task assignment to multiple unmanned aerial vehicles for load transportation.
112 citations
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TL;DR: A new optimizer is proposed and tested for a typical aerodynamic shape optimization of missile control surfaces with computational fluid dynamics (CFD), which significantly decreases the required CFD calls by over 62.5%.
103 citations
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TL;DR: The robust optimization results of airfoil and wing demonstrate that, the multi-fidelity surrogate model performs very well as a prediction model, and improves the optimization efficiency obviously.
100 citations
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TL;DR: The combination of flow solver robustness, precision of gradient information, robust mesh deformation, and adaptive parametrization brings us closer to a “push-button” solution for airfoil design.
94 citations
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TL;DR: A fractional order sliding mode controller based on back-stepping method is designed to attenuate wind disturbance and effects of variations in load and momentums of inertia.
93 citations
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TL;DR: This paper categorizes different advanced non-intrusive combustion diagnostic techniques, including their basic principles and especially applications for the study of combustion instability, including computed tomography of chemiluminescence, volumetric laser induced fluorescence, rainbow-PIV, etc., are discussed.
88 citations
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TL;DR: The proposed control method can be easily implemented to improve the performance and survivability of quadrotors in real life and the implementation process is simplified because of the reduced model dependency and smaller uncertainty variations of INDI-SMC/SMDO.
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TL;DR: By adding a feedback controller to the obtained optimal guidance law, both impact time and angle requirements are achieved and the singularity problem is tackled.
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TL;DR: The attitude tracking errors as well as the angular velocity errors are proved to be appointed-time stable and a robust controller with implementable structure is proposed to guarantee the performance functions under strong external disturbances and parameter uncertainties.
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TL;DR: In this article, the thermal and mechanical buckling behaviors of lightweight polymeric nanocomposite sandwich plates containing uniformly dispersed (UD) pores resting on two-parameter elastic foundations were investigated.
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TL;DR: In this article, the impact of the upstream wavy surface on the mixing zone and fuel penetration in the downstream of a transverse fuel jet was investigated using a three-dimensional model with high resolution.
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TL;DR: In this paper, the upward-parabola blowing jet flow control strategy for VAWTs is proposed to suppress the flow separation in advance, which can significantly enhance the aerodynamic performance by using significantly low energy consumption.
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TL;DR: A PHM model which combines multiple deep learning algorithms for condition assessment, fault classification, sensor prediction, and remaining useful life (RUL) estimation of aircraft systems is presented.
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TL;DR: An output feedback based trajectory tracking and attitude stabilization approach is synthesized by integrating NM and high-order ESO via dynamic surface control (DSC), leading to a much simpler control structure and reduced implementation costs.
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TL;DR: In this paper, the dynamic response of cylindrical sandwich panels with aluminum foam cores, hexagonal honeycomb cores, and auxetic honeycomb core are compared numerically. And the numerical results have a good agreement with the experiment date.
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TL;DR: Based on the ability of birds to stretch wings when flying at low speed and to constrict wings at high speed, a new bionic morphing UAV has been designed and developed as the study model by.
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TL;DR: In this article, the fundamental frequencies and nonlinear dynamic responses of functionally graded sandwich shells with double curvature under the influence of thermomechanical loadings and porosities are investigated.
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TL;DR: An iterative strategy to enhance the performance of task assignment and path planning in applications of distributed multiple unmanned aerial vehicles (Multi-UAV) and can achieve better performance of planning results and consume less computing resources.
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TL;DR: A surrogate-based gradient-free optimization algorithm that can handle cases where the function evaluations are expensive, the computational budget is limited, the functions are multimodal, and the optimization problem includes nonlinear equality or inequality con- straints is developed.
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TL;DR: An enhanced multi-sensor prognostic model based on KFOS-ELM and logistic regression (LR) model is designed for remaining useful life (RUL) prediction of aircraft engine.
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TL;DR: The ConvLSTM module is proposed to build a trainable model for air traffic flow prediction and it is drawn that spatial and temporal transition patterns of flight flow in air traffic system are fully learned by the proposed model.
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TL;DR: Two fixed-time fault-tolerant control schemes are developed to address the problem of attitude stabilization of a quadrotor unmanned aerial vehicle with external disturbances and actuator faults and are proved to be stable theoretically and strictly in the sense of Lyapunov.
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TL;DR: An adaptive super twisting algorithm sliding mode controller is proposed to track reference trajectory after input/output linearization of the longitudinal model, and the robustness of the designed controller is verified by simulations at the presence of aerodynamic perturbations.
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TL;DR: In this article, the Lattice Boltzmann/Very Large Eddy simulation method is used to predict the aerodynamic loads, the rotor wake development and the noise radiation of helicopter rotors in strong Blade-Vortex interaction conditions.
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TL;DR: In this article, the authors investigated the dynamic analysis of porous bi-directional functionally graded (FG) plates reinforced by eccentrically outside stiffeners and subjected to a moving load with a constant velocity.
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TL;DR: IDDM seeks the minimum and maximum points of the uncertain variables dimension-by-dimension and updates the nominal value of other uncertain variables through an iterative process and is efficient for structural interval uncertainty analysis, especially for problems with multidimensional uncertain variables.