Showing papers in "Aerospace Science and Technology in 2017"

TL;DR: In this article, the impact of additive manufacturing on aerodynamics, structures and materials used for UAVs is discussed and a review of state-of-the-art additive manufacturing technologies and their advantages and limitations are discussed.

TL;DR: Considering the underactuated and strongly coupled characteristics of quadrotor helicopter, a nonlinear control method by using integral backstepping combined with the sliding mode control (integral BS-SMC) was proposed in this paper.

TL;DR: In this article, a study on the vibrations of functionally graded material (FGM) rectangular plates with porosities and moving in thermal environment was conducted, where the porosity distribution of the FGM plates was taken into account by using von Karman nonlinear plate theory.

TL;DR: The proposed AGOA has a better searching ability than the traditional GOA and some other intelligent algorithms by introducing some improvement measures e.g. the natural selection strategy, the democratic decision-making mechanism, and the dynamic feedback mechanism based on the 1/5 Principle.

TL;DR: In this article, a free vibration analysis of a functionally graded (FG) porous cylindrical shell subject to different sets of immovable boundary conditions is performed, assuming that the modulus of elasticity of the porous composite is graded in the thickness direction.

TL;DR: In this article, a review of recent developments in the field of frequency selective surface (FSS)-based advanced electromagnetic (EM) structures is presented, which is a type of filter consisting of an array of periodic metallic patches or apertures on a dielectric substrate.

TL;DR: In this article, the bending, buckling and buckling of embedded nano-sandwich plates are investigated based on refined zigzag theory (RZT), sinusoidal shear deformation theory (SSDT), first order shear deformability theory (FSDT), and classical plate theory (CPT).

TL;DR: In this paper, the buckling behavior of 2D-FG porous micro- and nano-beams is studied in different porosity volume fractions (α, FG indexes (nx and nz) and rates of cross section change along thickness ( β h ) and width ( β b ).

TL;DR: In this article, the authors investigated nonlinear dynamic response and vibration of imperfect functionally graded carbon nanotube reinforced composite (FG-CNTRC) double curved shallow shells, where the shells are reinforced by single-walled carbon Nanotubes (SWCNTs) which vary according to the linear functions of the shell thickness.

TL;DR: A game theoretic formulation for multiple unmanned aerial vehicle (UAV) cooperative search and surveillance with modular framework that offers a flexible way to accommodate different global objectives and underlying physical constraints is developed.

TL;DR: In this paper, the effects of geometrical parameters, material properties, elastic Winkler and Pasternak foundations, mechanical, blast and damping loads on the nonlinear dynamic response and the natural frequencies of sandwich composite cylindrical panels are studied.

TL;DR: In this paper, a cooperative guidance model with impact angle constraints is proposed for the three-dimensional terminal guidance problem of multiple missiles cooperatively intercepting a maneuvering target, and a novel finite-time cooperative guidance law is designed to guarantee that all the missiles reach the target simultaneously.

TL;DR: In this article, the static response and free vibration of functionally graded carbon nanotube reinforced composite (FG-CNTRC) rectangular plate resting on Winkler-Pasternak elastic foundations using an analytical approach are studied.

TL;DR: In this paper, the problem of finite-time formation control for a group of quadrotor aircraft with a leader-follower structure is investigated, and a finite time position controller and attitude controller are designed respectively.

TL;DR: In this article, the effects of the delta wing height and the jet-to-crossflow pressure ratio have been investigated numerically based on grid independency analysis and code validation, and the obtained results predicted by the three-dimensional Reynolds-average Navier-Stokes (RANS) equations coupled with the two equation k- ω shear stress transport (SST) turbulence model show that the Delta wing has a highly remarkable improvement on mixing characteristics such as mixing efficiency and fuel penetration depth.

TL;DR: In this article, a back-stepping based flight controller for the receiver in Autonomous Aerial Refueling (AAR) by the combination of active disturbance rejection control (ADRC) and preview control methodology is proposed.

TL;DR: In this paper, the authors investigated the application of model predictive control (MPC) strategy for controlling a chaser spacecraft to dock with a tumbling target in space, while a receding prediction horizon is employed to complete the specific docking manipulation in finite time, and a 2-norm cost index about control input is used to minimize the fuel consumption of the chaser during docking.

TL;DR: The WeCare project (Utilizing Weather information for Climate efficient and eco-efficient future aviation) as mentioned in this paper aimed at finding solutions for reducing the climate impact of aviation based on an improved understanding of the atmospheric impact from aviation by making use of measurements and modeling approaches.

TL;DR: In this article, an active disturbance rejection control (ADRC) scheme was proposed for automatic carrier landing system (ACLS) in final approach to track desired touchdown point (DTP) altitude in the presence of carrier air wake turbulence and deck motion, based on the estimation and compensation of internal dynamics and external disturbances by extended state observer (ESO), outer-loop altitude controller and inner-loop attitude controllers.

TL;DR: In this article, a modified control-oriented model is derived with explicit consideration of the actuator dynamics property, and adaptive backstepping controller and dynamic inverse controller are designed for the altitude subsystem and the velocity subsystem, respectively.

TL;DR: In this paper, a non-dominated sorting genetic algorithm (NSGA-II) and first-order shear deformation theory (FSDT) were used to optimize sound transmission loss of a composite cylindrical shell with a porous material subjected to a plane sound wave.

TL;DR: In this article, an adaptive unscented Kalman filter for UAV's MEMS-based navigation is derived to realize in-flight initial alignment aided by GNSS (global navigation satellite system) and fulfill data fusion.

TL;DR: In this article, the nonlinear finite element software ABAQUS was used to carry out the numerical simulation of the deployment of membrane structures based on Miura-ori, by taking advantage of the variable Poisson's ratio model to revise the stress distribution of membrane elements.

TL;DR: In this paper, a thermal degradation study is carried out for two carbon-reinforced resins: the well known thermosetting phenolic and a thermoplastic polyether ketone-ketone (PEKK), recently developed specifically for this kind of application.

TL;DR: In this article, a new prescribed performance control (PPC) methodology for the longitudinal dynamic model of an air-breathing hypersonic vehicle via neural approximation is investigated.

TL;DR: In this article, a multi-objective reliability-based design optimization (MORBDO) was proposed for complex structure with multi-failure modes and multi-physics coupling.

TL;DR: In this paper, a multi-source information fusion fault diagnosis method is proposed based on the Dempster-Shafer (D-S) evidence theory, which utilizes the three-level signals from pump level, hydraulic power system level and hydraulic actuation system level.

TL;DR: In this paper, an active and passive flutter suppressions for highly flexible wings using piezoelectric transduction is addressed. But the work is limited to the case of a single wing.

TL;DR: In this article, numerical simulations using Euler equations with detailed chemistry are performed to investigate the effect of fuel-air composition inhomogeneity on the oblique detonation wave (ODW) initiation in hydrogen-air mixtures.

TL;DR: In this article, the authors investigated the use of active opposing jet concept in combination with geometric variations of the opposing jet nozzle to alleviate high wave drag formation, and the results showed a considerable reduction in drag by using a divergent nozzle.