Showing papers in "Aerospace Science and Technology in 2022"

TL;DR: In this article , an unknown input observer-based appointed-time funnel control policy is proposed for quadrotors suffering from environmental disturbances and parametric uncertainties, where a continuous piecewise function is embedded to specify the funnel envelop, such that the stringent temporal constraints can be arbitrarily prescribed by operators.

TL;DR: In this paper , a cooperative navigation strategy based on network graph theory is proposed to coordinate all the connected UAVs in a swarm in the presence of unknown disturbances, and the stability of the aerial swarm system is guaranteed using the Lyapunov approach.

TL;DR: In this article , a semi-analytical approach is proposed for wave analysis of the periodic laminated composites, where the material properties are measured by the layer-wise distribution of graphene platelets (GPLs) in nanocomposite matrix and fiber content in the laminated composite.

TL;DR: In this paper , the authors demonstrate the practicality of air-breathing/ramjet rotating detonation engines fueled by liquid kerosene and air, and demonstrate the high potential of their application to air breathing propulsion.

TL;DR: In this article , the vibrational behavior of Coupled Hemispherical-ConicalConical Conical Shells (CHCCS) structures made composite materials reinforced with nanofillers is studied.

TL;DR: In this article , a deep learning-based blade damage detection method is proposed to endow borescope inspection with intelligence, which pays more attention to texture information, which reflects the types of damages.

TL;DR: In this article , a lightweight nonlinear vibration isolator with deployable mechanism and quasi-zero-stiffness (QZS) property is proposed by using the Kresling origami modules (KOMs).

TL;DR: In this paper , an event-trigger-based fractional-order sliding mode control strategy is expanded as an implementation technique for the stabilization of quadrotor unmanned aerial vehicles in the existence of external random/time-varying disturbances.

TL;DR: In this article , a new equivalent shell model of corrugated cylindrical shells is established, and the governing equations are obtained by using the Love thin shell theory and Hamilton principle, and then turned into ordinary differential equations by the Galerkin procedure, upon which numerical solutions are achieved by the Duhamel integration and small-time increment technique.

TL;DR: In this article , an adaptive leader-following formation tracking control approach for multiple spacecraft under a directed communication topology with consideration of external disturbances, formation safety and limited sensing ranges is investigated.

TL;DR: In this paper , a path planning method based on the multi-strategy evolutionary learning artificial bee colony algorithm is proposed to produce a high-quality flight path for the unmanned autonomous helicopter with multi-constraints.

TL;DR: In this paper , the authors proposed two cross-domain aero engine fault diagnosis methods, one-stage-transfer-learning ELM (OSTL-ELM) and two-stage transfer-learning EA (TSTL-EA) based on extreme learning machine (ELM), which has fast training speed and good real-time diagnosis.

TL;DR: In this article , a 3D optimal feasible flight path generation and collision avoidance algorithm based on POMDP and improved grey wolf optimizer (GWO) for an UAV is presented.

TL;DR: In this paper , a non-probabilistic uncertainty quantification approach is proposed to simplify the process of system uncertainties, and the corresponding response range is attended by collocation method with advantages upon precision and efficiency.

TL;DR: In this paper , the in-plane dynamic crushing responses of the novel Re-entrant circular (REC) honeycombs through numerical simulations and theoretical analyses were investigated, and it was shown that the REC honeycomb presents obvious negative Poisson's ratio (NPR) effect, attributed to its reentrant characteristic.

TL;DR: In this paper , the vibrational behavior of the complex types of nanocomposites paired shells with arbitrary support conditions was evaluated by conducting the Eshelby-Mori-Tanaka scheme as an efficient homogenization procedure.

TL;DR: In this article , the vibrational behavior of three-layered cylindrical shells with graphene nanoplatelets (GNPs)-reinforced composite core and piezo-electro-magnetic (PEM) face sheets is investigated.

TL;DR: In this article , an Object Detection Convolutional Neural Network (ODN) is used to extract features of the observed craters that are then processed by standard image processing algorithms in order to provide pseudo-measurements that can be used by navigation filter.

TL;DR: In this paper , the analysis of the free vibration performance related to the Combined Paraboloidal-Conical Shell (CPCS) structures is evaluated for the first time, where the First Shear Deformation Theory (FSDT) and General Shell Hypothesis (GSH) are involved in discovering the primary relationships related to CPCS's shell segments.

TL;DR: In this article , a mathematical model to analyze the static and dynamic behaviors of functionally graded graphene reinforced composite (FG-GRC) beam with geometric imperfection subjected to thermo-electro-mechanical load is established.

TL;DR: In this paper , the elastic support of an elastically supported porous truncated joined conical-conical shell (JCCS) is derived by using artificial spring technology, which is achieved by applying Hamilton principle and the first order shear deformation theory (FSDT).

TL;DR: In this paper , a CFD/CAA-based approach is proposed to predict the aerodynamic performances and tonal/broadband noise radiation of low-Reynolds number propellers at engineering level.

TL;DR: In this article , the authors investigated the performance of RDE combined with various types of aerospike nozzles and proposed a method of designing an optimal nozzle for RDE with annulus combustion chamber.

TL;DR: In this paper , the spray characteristics of a liquid-gas pintle injector at different total momentum ratios (TMR) were investigated by means of experiment and numerical simulation, where water and nitrogen were used as simulant for liquid fuel ejected out of radial gap and gas oxidizer ejected out from axial annular gap, respectively.

TL;DR: In this paper , a nonlinear extended state observer and recursive sliding mode control (NESO-RSMC) was proposed for trajectory tracking of a quadrotor, and the numerical simulation results verify the robustness of the proposed scheme in the case of external disturbances and model parameter uncertainties.

TL;DR: In this paper , a novel fixed-time fast nonsingular terminal slide mode surface (FNTSMS) was proposed, which has the characteristics of nonsingularity, converges in fixed time.

TL;DR: An adaptive fault-tolerant attitude controller for a class of flexible spacecraft is designed in this article to cater to flexible appendages' vibrations, along with the simultaneous consideration of erratic inertial uncertainties, environmental disturbances, and actuator-related faults.

TL;DR: In this article , a reduced-order model of sloshing was applied to the case of a research wing to investigate their effects on the wing aeroelastic response under pre-critical and post-critical conditions.

TL;DR: In this article , an actor-critic framework is adopted to find the optimal control policy and the critic network aims to evaluate the current control policy, and a complementary integrator is introduced to eliminate the steady-state error caused by the approximation error of the deep neural networks.

TL;DR: In this article , a coverage-based cooperative guidance (CBCG) law is proposed based on three concepts, i.e., interceptor reachable area, interceptor feasible area, and hypersonic vehicle escape area.