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Noise generated by aircraft continues to be a pressing issue for society, as an increasing number of people residing in close proximity to airports make noise complaints on a regular basis. The reduction in aircraft noise is therefore a very important engineering task that would require the careful identification of different acoustic sources around the airplane, the understanding of noise source behavior and ranking along flight trajectories, sophisticated measurement techniques, and robust and accurate numerical tools aimed at predicting the generation of noise, the propagation through the atmosphere, and the resulting noise impact along approach and departure flights. For an overall assessment of the situation, it has to be assessed along entire flight trajectories rather than assessing limited operating conditions only. Furthermore, it is highly recommended to apply multiple acoustic metrics and account for different and widespread observer locations along the flight. Only then can the overall situation be adequately captured. Obviously, this is a highly multidisciplinary effort and no single discipline can address this problem. This reprint includes selected research studies with that multidisciplinary context that deal with numerical or experimental investigations that range from the investigation of specific noise sources to the assessment of noise generated by the overall aircraft in operation. Both basic and applied research studies involving the modelling and simulation of aircraft noise are included.

aircraft noise simulation --- conceptual aircraft design --- noise certification --- ICAO Annex 16 --- PANAM --- RCE --- green aviation --- airport operations --- aircraft noise impact --- noise prediction method --- large eddy simulations --- jet noise --- jet–surface interaction --- aircraft noise --- simulation --- sonAIR --- FLULA2 --- AEDT --- validation with measurements --- low-noise aircraft design --- center of excellence --- Sustainable and Energy-Efficient Aviation (SE2A) --- forward swept wing --- PrADO --- aircraft noise prediction --- supersonic transport aircraft --- NASA STCA --- FAA NPRM --- LTO noise --- SuperSonic Transport (SST) --- aircraft conceptual design --- aeroacoustics --- rotor-stator interaction noise --- porous material --- turbulence modeling --- synthetic turbulence --- CFD --- supersonic aircraft --- ICAO Annex 16 Vol.1 --- multiobjective optimisation --- community noise --- air quality --- sound quality --- noise abatement procedures --- spectral matching

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Noise generated by aircraft continues to be a pressing issue for society, as an increasing number of people residing in close proximity to airports make noise complaints on a regular basis. The reduction in aircraft noise is therefore a very important engineering task that would require the careful identification of different acoustic sources around the airplane, the understanding of noise source behavior and ranking along flight trajectories, sophisticated measurement techniques, and robust and accurate numerical tools aimed at predicting the generation of noise, the propagation through the atmosphere, and the resulting noise impact along approach and departure flights. For an overall assessment of the situation, it has to be assessed along entire flight trajectories rather than assessing limited operating conditions only. Furthermore, it is highly recommended to apply multiple acoustic metrics and account for different and widespread observer locations along the flight. Only then can the overall situation be adequately captured. Obviously, this is a highly multidisciplinary effort and no single discipline can address this problem. This reprint includes selected research studies with that multidisciplinary context that deal with numerical or experimental investigations that range from the investigation of specific noise sources to the assessment of noise generated by the overall aircraft in operation. Both basic and applied research studies involving the modelling and simulation of aircraft noise are included.

Technology: general issues --- History of engineering & technology --- aircraft noise simulation --- conceptual aircraft design --- noise certification --- ICAO Annex 16 --- PANAM --- RCE --- green aviation --- airport operations --- aircraft noise impact --- noise prediction method --- large eddy simulations --- jet noise --- jet–surface interaction --- aircraft noise --- simulation --- sonAIR --- FLULA2 --- AEDT --- validation with measurements --- low-noise aircraft design --- center of excellence --- Sustainable and Energy-Efficient Aviation (SE2A) --- forward swept wing --- PrADO --- aircraft noise prediction --- supersonic transport aircraft --- NASA STCA --- FAA NPRM --- LTO noise --- SuperSonic Transport (SST) --- aircraft conceptual design --- aeroacoustics --- rotor-stator interaction noise --- porous material --- turbulence modeling --- synthetic turbulence --- CFD --- supersonic aircraft --- ICAO Annex 16 Vol.1 --- multiobjective optimisation --- community noise --- air quality --- sound quality --- noise abatement procedures --- spectral matching

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This Special Issue book contains selected papers from works presented at the 10th EASN (European Aeronautics Science Network) International Conference on Innovation in Aviation & Space, which was held from the 2nd until the 4th of September, 2020. About 350 remote participants contributed to a high-level scientific gathering providing some of the latest research results on the topic, as well as some of the latest relevant technological advancements. Eleven interesting articles, which cover a wide range of topics including characterization, analysis and design, as well as numerical simulation, are contained in this Special Issue.

Technology: general issues --- History of engineering & technology --- boarding --- simulation --- cabin --- aircraft --- passenger --- movement --- Covid-19 --- turbofan --- unmanned aerial vehicles --- cruise missile --- aerial target --- axial compressor --- blade --- titanium alloy --- aluminium alloy --- titanium aluminide --- safety factor --- thermal management --- hybrid-electric aircraft --- ram air-based cooling --- compact heat exchangers --- meredith effect --- aircraft air quality --- adaptive ECS --- subject testing --- boundary layer ingestion --- propulsive fuselage --- wake-filling --- turbo-electric --- proof-of-concept --- wind tunnel --- fan rig --- multi-disciplinary aircraft design --- collaborative research --- microturbine --- sustainable aviation fuel --- ATJ --- HEFA --- emissions --- alternative fuel --- biocomponent --- combustion --- fuel blend --- drop-in fuel --- synthesized kerosene --- cargo fire protection --- fire suppression --- testing --- iron bird --- hydraulic system --- flight simulator --- force control --- PID control --- unmanned aircraft --- thrust determination --- flight testing --- e-Genius-Mod --- free-flight wind tunnel --- hybrid-electric propulsion --- regional air travel --- alternate airports --- top-level aircraft requirements --- figures of merit --- aircraft design --- aircraft structure --- strut-braced wing --- parametric modeling --- decomposition principles --- strength analysis --- finite element method (FEM) --- doublet lattice method --- four-level approach --- boarding --- simulation --- cabin --- aircraft --- passenger --- movement --- Covid-19 --- turbofan --- unmanned aerial vehicles --- cruise missile --- aerial target --- axial compressor --- blade --- titanium alloy --- aluminium alloy --- titanium aluminide --- safety factor --- thermal management --- hybrid-electric aircraft --- ram air-based cooling --- compact heat exchangers --- meredith effect --- aircraft air quality --- adaptive ECS --- subject testing --- boundary layer ingestion --- propulsive fuselage --- wake-filling --- turbo-electric --- proof-of-concept --- wind tunnel --- fan rig --- multi-disciplinary aircraft design --- collaborative research --- microturbine --- sustainable aviation fuel --- ATJ --- HEFA --- emissions --- alternative fuel --- biocomponent --- combustion --- fuel blend --- drop-in fuel --- synthesized kerosene --- cargo fire protection --- fire suppression --- testing --- iron bird --- hydraulic system --- flight simulator --- force control --- PID control --- unmanned aircraft --- thrust determination --- flight testing --- e-Genius-Mod --- free-flight wind tunnel --- hybrid-electric propulsion --- regional air travel --- alternate airports --- top-level aircraft requirements --- figures of merit --- aircraft design --- aircraft structure --- strut-braced wing --- parametric modeling --- decomposition principles --- strength analysis --- finite element method (FEM) --- doublet lattice method --- four-level approach

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Multibody systems with flexible elements represent mechanical systems composed of many elastic (and rigid) interconnected bodies meeting a functional, technical, or biological assembly. The displacement of each or some of the elements of the system is generally large and cannot be neglected in mechanical modeling. The study of these multibody systems covers many industrial fields, but also has applications in medicine, sports, and art. The systematic treatment of the dynamic behavior of interconnected bodies has led to an important number of formalisms for multibody systems within mechanics. At present, this formalism is used in large engineering fields, especially robotics and vehicle dynamics. The formalism of multibody systems offers a means of algorithmic analysis, assisted by computers, and a means of simulating and optimizing an arbitrary movement of a possibly high number of elastic bodies in the connection. The domain where researchers apply these methods are robotics, simulations of the dynamics of vehicles, biomechanics, aerospace engineering (helicopters and the behavior of cars in a gravitational field), internal combustion engines, gearboxes, transmissions, mechanisms, the cellulose industry, simulation of particle behavior (granulated particles and molecules), dynamic simulation, military applications, computer games, medicine, and rehabilitation.

Technology: general issues --- History of engineering & technology --- symmetry --- asymmetry --- measure of skewness --- decile --- Monte Carlo algorithm --- Gibbs–Appell --- energy of accelerations --- finite element --- nonlinear system --- elastic elements --- analytical dynamics --- robotics --- Hilbert’s inequality --- Fubini theorem --- Fenchel-Legendre transform --- time scale --- fractional derivative --- skin tissues --- thermal damages --- Laplace transforms --- Kane’s equations --- planar mechanism --- Lagrange’s equations --- dynamics --- finite element method (FEM) --- multibody system (MBS) --- wind water pump --- strands wire rope --- experimental transitory vibrating regime --- stiffness --- damping --- joint time-frequency analysis --- Prony method --- matrix pencil method --- multibody --- propulsion drive --- linear motion --- eccentric trajectory --- reusable launch vehicles --- soft landing --- magnetorheological fluid --- numerical simulation --- multibody systems with flexible elements --- elastic bonds --- vibrations --- initial matrix --- stiffness matrix --- stability --- laser --- nuclear installation --- insulation --- Extreme Light Infrastructure --- gamma ray --- flexible coupling --- bolt --- non-metallic element --- finite element method --- elastic characteristic --- Light Sport Aircraft --- conceptual aircraft design --- wing --- flap --- aileron --- weight estimation --- symmetric profile --- sustainability --- mosquito borne diseases --- Aedes Aegypti --- Wolbachia invasion --- impulsive control --- time scales --- Noether theory --- conserved quantity --- elastic coupling --- non-metallic elements --- dynamic rigidity --- non-collinearly shafts --- n/a --- Gibbs-Appell --- Hilbert's inequality --- Kane's equations --- Lagrange's equations