Aeroacustic and Vibroacoustic Advancement in Aerospace and Automotive Systems

Citarella, Roberto; Federico, Luigi; Barbarino, Mattia

doi:10.3390/app10113853

Cited by 7 publications

(5 citation statements)

References 11 publications

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“…The purpose of this Special Issue was to highlight the latest enhancements in vibroacoustics and aeroacustics of marine, aerospace, and automotive systems. This Special Issue can be seen as a further step ahead from two previous Special Issues covered by some of the Authors, see [1,2].…”

Section: Introductionmentioning

confidence: 96%

Advances in Vibroacoustics and Aeroacustics of Marine, Aerospace and Automotive Systems

2022

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This Special Issue highlights the latest enhancements in vibroacoustics and aeroacustics of marine, aerospace, and automotive systems. Topics covered in this Special Issue deal with computational, instrumentation, and data analysis of acoustics and vibrations of aircrafts, satellites, spacecrafts, automotives, trains, ships, etc., ranging from aerodynamically generated noise to engine noise, vibration transmission, sound absorption, acoustic treatments, modelling procedures and vibroacoustic properties of materials. The focus of this Special Issue is related to industrial aspects as dedicated numerical studies, experimental testing campaigns, and optimization problems. Procedures and algorithms useful to reach the abovementioned objectives in the most efficient way are illustrated in the collected papers.

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Section: Introductionmentioning

confidence: 96%

Advances in Vibroacoustics and Aeroacustics of Marine, Aerospace and Automotive Systems

2022

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“…Quasi-harmonic vibrations are produced when a random broadband vibration (for example, from helicopter engines) is applied to an oscillating system formed by a helicopter structure as a model of a singledegree-of-freedom system with damping. This is subsequently partially transferred to the helicopter's antenna elements, which are loaded by mechanical manifestations of vibrations from the helicopter's structural elements [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

et al. 2023

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A helicopter in flight can be considered an unstable dynamic system with many unwanted vibrations originating from multiple sources, such as the operation of the engines and individual components. These vibrations cause the degradation of the structural and functional components of a helicopter, thereby generally reducing the utility and technical efficiency of the aircraft. During the analysis of frequently recurring errors of medium-heavy helicopters, partial damage to antenna elements with vertical polarisation was detected. These damages provided the basis for the presented research, based on which supplementary vibrations caused by unwanted electromagnetic oscillations were revealed. These oscillations were detected in the process of communication between the helicopter crew and the ground ATC (air traffic control) station. This phenomenon’s existence and negative influence were confirmed via measurements and modal analysis, based on which an exact synergy between harmonic frequencies of the helicopter’s normal vibrations was discovered. The obtained results serve as a theoretical and practical basis for the future monitoring of this phenomenon, especially in the process of determining the “health status” of medium-heavy helicopters.

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“…Vibration and noise have been considered as one of the nonnegligible issues in the field of aerospace [1][2][3] and rail transportation [4][5][6] over the past few decades. It is difficult to be effectively controlled for low-frequency noise due to its characteristics such as long wavelength, low attenuation rate, and strong penetrability [7,8].…”

Section: Introductionmentioning

confidence: 99%

Sound insulation properties of membrane-type acoustic metamaterials with petal-like split rings

Huang¹,

Lv²,

Luo³

et al. 2021

J. Phys. D: Appl. Phys.

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Membrane-type acoustic metamaterials (MAMs) are lightweight and flimsy materials with excellent low-frequency insulation performance, which breaks the limitations of the traditional mass law and provides a new idea for noise reduction in the low-frequency range. To further broaden the sound insulation bandwidth on the premise of lightweight design, a novel MAM with petal-like rings is proposed, and the parametric studies on the structural parameters of split rings are carried out in this paper. By combining the finite element model simulation and impedance tube test, the effectiveness of the proposed structure and the correctness of the numerical simulation are validated. Moreover, the sound transmission loss curves and modal shapes of four different structures are computed and analyzed to clarify the insulation mechanism of the novel structure. Finally, the width, the center angle, the centroid position, and the weight of the split rings in the novel structure are parametrically analyzed to figure out the regulation rules of the sound insulation characteristics.

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Aeroacustic and Vibroacoustic Advancement in Aerospace and Automotive Systems

Cited by 7 publications

References 11 publications

Advances in Vibroacoustics and Aeroacustics of Marine, Aerospace and Automotive Systems

Advances in Vibroacoustics and Aeroacustics of Marine, Aerospace and Automotive Systems

Unwanted Supplementary Vibrations of Helicopter Radio Communication Systems

Sound insulation properties of membrane-type acoustic metamaterials with petal-like split rings

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