Acoustic Improvements of Aircraft Headrests Based on Electrospun Mats Evaluated Through Boundary Element Method

Giannella, Venanzio; Branda, F.; Passaro, Jessica; Petrone, Giuseppe; Barbarino, Mattia; Citarella, Roberto

doi:10.3390/app10165712

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…The work reported in [15] represented a further step ahead of what experimentally observed in [7]. Namely, the PNC improvements for aircraft headrests were studied now through BEM models with the aim of comparing them in terms of the pressure levels at passengers' ears.…”

Section: The Present Issuementioning

confidence: 99%

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: The Present Issuementioning

confidence: 99%

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

2022

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“…Electrospun micro/nanofibers possess many advantages, such as small diameter, light weight, high specific surface area, and porosity. The sound absorption materials made of electrospun micro/nanofibers are promising for noise reduction, especially in traffic [ 13 , 14 , 15 ]. The sound absorption mechanism of electrospun micro/nanofibers is complex, and their sound absorption performance is mainly affected by several factors: material, morphology, thickness, spatial structure, and cavity depth.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials

Peng

et al. 2022

Nanomaterials

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Noise is considered severe environmental pollutant that affects human health. Using sound absorption materials to reduce noise is a way to decrease the hazards of noise pollution. Micro/nanofibers have advantages in sound absorption due to their properties such as small diameter, large specific surface area, and high porosity. Electrospinning is a technology for producing micro/nanofibers, and this technology has attracted interest in the field of sound absorption. To broaden the applications of electrospun micro/nanofibers in acoustics, the present study of electrospun micro/nano fibrous materials for sound absorption is summarized. First, the factors affecting the micro/nanofibers’ sound absorption properties in the process of electrospinning are presented. Through changing the materials, process parameters, and duration of electrospinning, the properties, morphologies, and thicknesses of electrospun micro/nanofibers can be controlled. Hence, the sound absorption characteristics of electrospun micro/nanofibers will be affected. Second, the studies on porous sound absorbers, combined with electrospun micro/nanofibers, are introduced. Then, the studies of electrospun micro/nanofibers in resonant sound absorption are concluded. Finally, the shortcomings of electrospun micro/nano fibrous sound absorption materials are discussed, and the future research is forecasted.

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“…Noise control methods mainly include passive and active control strategies [1][2][3]. Passive noise control improves ambient acoustic performance by absorbing materials and changing the shape of the structure in conjunction with the environment [4]. These methods have an obvious effect on reducing the middle-and high-frequency noise in the environment.…”

Section: Introductionmentioning

confidence: 99%

A Novel Narrowband Active Noise Control System with Online Secondary Path Modeling Based on Factor Decomposition and Application in Open Space

Luo

et al. 2022

Applied Sciences

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Due to the complexity of the coupling between the active noise control (ANC) controller and secondary path estimator, performance analysis of the system becomes particularly difficult. At present, the performance analysis of the system is often based on the fact that the secondary path tends to be stable, and the secondary path fitting error is minimal. However, in the early stage of system operation, or when the secondary path changes suddenly, the secondary path fitting error is significant, which easily causes divergence of the system control. It is still unable to guarantee the step-size bounds of convergence stability. Therefore, factor decomposition was used to analyze the mean weight behavior in this study. This strategy emphasizes the influence of secondary path modeling (SPM) error. The mean square behavior was evaluated using the energy conservation relationship. According to the established theoretical model, the convergence condition of the system was derived and the upper bound of step size suitable for all stages of system operation was obtained. The simulation and experimental results show that the ANC system is quite stable and robust under extreme conditions and has an obvious noise reduction effect in a specific range of open space, which can reach about 20 dB noise reduction.

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Acoustic Improvements of Aircraft Headrests Based on Electrospun Mats Evaluated Through Boundary Element Method

Cited by 8 publications

References 29 publications

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

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

Research Progress on Sound Absorption of Electrospun Fibrous Composite Materials

A Novel Narrowband Active Noise Control System with Online Secondary Path Modeling Based on Factor Decomposition and Application in Open Space

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