Showing papers in "Progress in Aerospace Sciences in 2021"

TL;DR: There is a need for a new branch of research that analyzes urban air mobility from the perspective of urban planning, including issues around zoning, air rights, public transportation, real estate development, public acceptance, and access inequalities.

TL;DR: Three typical data-driven aerodynamic methods are introduced, including system identification, feature extraction and data fusion, which help to gain physical insights on flow mechanism and have shown great potential in engineering applications like flow control, aeroelasticity and optimization.

TL;DR: In this paper, the authors discuss a hierarchy of numerical approaches that range from semi-empirical schemes that estimate the wall pressure spectrum using mean flow and turbulence statistics to high-fidelity unsteady flow simulations such as Large Eddy Simulation (LES) or Direct Numerical Simulation (DNS) that resolve the sound generation and scattering process based on the first-principles flow physics.

TL;DR: A systematic survey of state-of-the-art algorithms that are capable of generating reliable guidance and control commands for space/aerospace vehicles and particular focus is given to recent attempts to explore the possible uses of AI techniques in connection with the optimal control of the vehicle systems.

TL;DR: In this paper, a review of active and passive control of turbulent near-wall layers to the imposition of unsteady and wavy transverse motion is presented, and a forward look towards possible future research and practical realizations is provided.

TL;DR: An extensive review of the developments in the aeroelasticity of morphing aircraft that occurred in the last decade (from 2009 to 2020) is presented and trends and research gaps are identified and discussed and main conclusions are drawn.

TL;DR: The review and prospects of the combined spacecraft contact dynamics and control technologies including the capturing strategy analysis, contact dynamics modeling, inertia parameter estimation and post-capture controller design are presented.

TL;DR: Integrated System Health Management (ISHM) is a promising technology that fuses sensor data and historical state-of-health information of components and subsystems to provide actionable information and enable intelligent decision-making regarding the operation and maintenance of aerospace systems as mentioned in this paper.

TL;DR: In this paper, the authors explore the concepts of hybrid airship designs that have been proposed in the recent past, and highlight the current state-of-the-art in this field.

TL;DR: The planetary regolith sampler (PRS) as discussed by the authors is a type of device that can penetrate, collect, transfer, and stow regolith samples, and is commonly equipped on a lander or rover in planetary exploration.

TL;DR: Five space habitat design concepts are reviewed with the principal aim of addressing the five fundamental problems in long term space exploration: artificial gravity, efficient radiation protection, sustainable food, growth strategy, and commercial values.

TL;DR: This review study gives an overview of embedded propulsion, where boundary layer ingestion was heavily examined and gives a detailed overview of optimization methods in the conceptual and preliminary design stage, and illustrates the benefits of the usage of integrated optimization methods.

TL;DR: In this paper, the state-of-the-art power electronics in more electric aircraft (MEA) vis-a-vis the generation and distribution of power within these aircraft are examined and weighed according to their respective reliability characteristics.

TL;DR: A comprehensive literature review was necessary to re-evaluate the work done by the research community in the appropriate domains and this review article aims to cover all the relevant domains needed to be understood before proceeding towards the development of an acoustics-based fault diagnostic framework for an aircraft APU.

TL;DR: The development and application of the mathematical modelling of the advanced rotorcraft configuration, including compound helicopter configurations and tilt-rotor vehicles are reviewed, with emphasis on the modelling of rotor aerodynamics and aerodynamic interaction among the rotor, fuselage, and other parts.

TL;DR: An overview of recent developments in the understanding of membrane wing aerodynamics is presented, focusing on the dynamic aeroelasticity of membrane wings in steady flow conditions, with special focus on the physical mechanisms that drive membrane oscillations and the aerodynamic benefits of such oscillations.

TL;DR: While GIE and HET are mature and well understood, the power consumption of miniaturized thrusters is relatively high, leaving room for improvement toward practical application, and CFT, on the other hand, features appreciable performance even in miniaturization form, offering promise to serve for small spacecraft platforms.

TL;DR: The recent literature on this topic is reviewed, showing many variabilities in the parameters that define freeplay and its aeroelastic response, with the majority of the existing models being developed deterministically.

TL;DR: The acoustic mode detection and noise source reconstruction methods are most relevant to the understanding of noise generation mechanism and propagating characteristics, which are useful for further noise reduction studies, and therefore are extensively reviewed in this article.

TL;DR: The surface characteristics of 3SBs are important factors affecting the landing process of probes, so the achievements of the surface characteristics that have been obtained by scientific observations are reviewed, and theoretical research on mechanical properties is discussed.

TL;DR: In this article, the authors summarized the key research progress on the fluid dynamics and aero-optical effects of high-speed optical apertures and evaluated potential aerooptical suppression solutions, such as flow control and adaptive optics.

TL;DR: In this article, the authors present the recent developments in the study of supersonic parachutes based on the use of CFD and FSI simulations to predict their aerodynamic performances, summarizes the progress in experimental and numerical research aiming to investigate the unsteady aerodynamics in such a FSI problem, and concludes with discussions on the future challenges in the design and application of SUPA for Mars exploration missions.

TL;DR: In this article, previous studies focused on wake propagation and flow development of multi-rotor drones are consolidated and discussed, and an in-depth understanding of wake propagation is critical to accurately predict as it can have adverse effects on vehicle stability and contaminate in-situ sensor measurements that are placed on the vehicle, such as those which facilitate autonomous maneuvering or atmospheric sampling.

TL;DR: The key directions for future development emerging from this review, such as the use of commercial off the shelf components, the increasing use of miniaturized technology, and software defined technology, are discussed.

TL;DR: In this article, the theory governing Rayleigh scattering and the FRS technique to retrieve helium mole-fraction in supersonic flow is discussed in detail and the impact on the results of a departure from the key assumptions in FRS mixing studies will be analyzed for a canonical parallel injection using strut injector in high-speed gas flows.