Advances in Vibroacoustics and Aeroacustics of Aerospace and Automotive Systems

Citarella, Roberto; Federico, Luigi

doi:10.3390/app8030366

Cited by 21 publications

(14 citation statements)

References 22 publications

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“…The typical topics to be tackled for investigations of noise and vibrations of vehicles, aircraft, space launchers, etc. deal with aerodynamically generated noise, engine noise, Passive Noise Control (PNC), Active Noise Control (ANC) and assessment of acoustic properties of innovative materials [1]. The reduction of acoustic emissions and the improvement of interior comfort are on the path of all major industries of the transport system, having a direct impact on customer satisfaction and, consequently, on the commercial success of new products.…”

Section: Introductionmentioning

confidence: 99%

A Novel Optimization Framework to Replicate the Vibro-Acoustics Response of an Aircraft Fuselage

et al. 2020

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In this work, a novel optimization framework, based on a Multi-Disciplinary Optimization (MDO) procedure, applied to the vibro-acoustic Finite Element Method (FEM) model of an aircraft fuselage mock-up, is proposed. The MDO procedure, based on an Efficient Global Optimization (EGO)-like approach, is implemented to characterize acoustic sources that replicate the sound pressure field generated by the engines on the fuselage. A realistic sound pressure field, evaluated by aeroacoustic simulations, was considered as the reference acoustic load, whereas two equivalent sound fields, displayed by two different arrays of microphones and generated by the same configuration of monopoles, were calculated by the proposed vibro-acoustic FEM-MDO procedure. The proposed FEM-MDO framework enables to set up ground experimental tests on aircraft components, useful to replicate their vibro-acoustic performances as if tested in flight. More in general, such a procedure can also be used as a reference tool to design simplified tests starting from more complex ones.

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Section: Introductionmentioning

confidence: 99%

A Novel Optimization Framework to Replicate the Vibro-Acoustics Response of an Aircraft Fuselage

et al. 2020

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“…With respect to the vibroacoustics of casings, such as the vibrational noise of car body and compressor casings, the hybrid finite-element method/boundary-element method (FEM/BEM) approach and the hybrid finite-element method/statistical energy analysis (FEM/SEA) approach are often used. It could be also appropriate to cite Citarella and Federico [2], who have made a comprehensive literature review of both the structural and acoustic modeling methods that are used nowadays to predict the vibroacoustics' performance. They pointed out that lower frequencies, where the tonal resonances are significant, are calculated applying finite element methods (FEM), whereas for higher frequencies, a statistic energy approach can be chosen.…”

Section: Introductionmentioning

confidence: 99%

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

et al. 2019

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A numerical optimization is presented to reduce the vibrational noise of a centrifugal fan volute. Minimal vibrational radiated sound power was considered as the aim of the optimization. Three separate parts of volute panel thickness (ST: the side panel thickness; BT: the back panel thickness; FT: the front panel thickness) were taken as the design variables. Then, a vibrational noise optimization control method for the volute casing was proposed that considered the influence of vibroacoustic coupling. The optimization method was mainly divided into three main parts. The first was based on the simulation of unsteady flow to the fan to obtain the vibrational noise source. The second used the design of experiments (DoE) method and a weighted-average surrogate model (radial basis function, or RBF) with three design variables related to the geometries of the three-part volute panel thickness, which was used to provide the basic mathematical model for the optimization of the next part. The third part, implementing the low vibrational noise optimization for the fan volute, applied single-objective (taking volute radiated acoustical power as the objective function) and multi-objective (taking the volute radiated acoustical power and volute total mass as the objective function) methods. In addition, the fan aerodynamic performance, volute casing surface fluctuations, and vibration response were validated by experiments, showing good agreement. The optimization results showed that the vibrational noise optimization method proposed in this study can effectively reduce the vibration noise of the fan, obtaining a maximum value of noise reduction of 7.3 dB. The optimization in this study provides an important technical reference for the design of low vibroacoustic volute centrifugal compressors and fans whose fluids should be strictly kept in the system without any leakage.

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“…Therefore, it is urgently desired to develop an efficient approach to analyze the dynamic characteristics of stiffened cylindrical shells. As an important analysis technique, free vibration analysis is frequently required and has always been one study focus since it can provide valuable insight into dynamic behaviors and vibration control of stiffened cylindrical shells [4][5][6][7]. In past several decades, the increasing application of stiffened cylindrical shells has motivated great efforts in developing more accurate mathematical models and corresponding approaches for analyzing their dynamic behaviors.…”

Section: Introductionmentioning

confidence: 99%

A Unified Approach of Free Vibration Analysis for Stiffened Cylindrical Shell with General Boundary Conditions

Zhang

Yang

Song

2019

Mathematical Problems in Engineering

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A unified approach of free vibration analysis for stiffened cylindrical shell with general boundary conditions is presented in this paper. The vibration of stiffened cylindrical shell is modeled mathematically involving the first-order shear deformation shell theory. The improved Fourier series is selected as the admissible displacement function while the arbitrary boundary conditions are simulated by adjusting the equivalent spring stiffness. The natural frequencies and modal shapes of the stiffened shell are obtained by solving the dynamic model with the Rayleigh-Ritz procedure. Various numerical results of free vibration analysis for stiffened cylindrical shell are obtained, including natural frequencies and modes under simply supported, free, and clamped boundary conditions. Moreover, the effects of stiffener on natural frequencies are discussed. Compared with several state-of-the-art methods, the feasibility and validity of the proposed method are verified.

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Advances in Vibroacoustics and Aeroacustics of Aerospace and Automotive Systems

Abstract: n/a

Cited by 21 publications

References 22 publications

A Novel Optimization Framework to Replicate the Vibro-Acoustics Response of an Aircraft Fuselage

A Novel Optimization Framework to Replicate the Vibro-Acoustics Response of an Aircraft Fuselage

Vibroacoustic Optimization Study for the Volute Casing of a Centrifugal Fan

A Unified Approach of Free Vibration Analysis for Stiffened Cylindrical Shell with General Boundary Conditions

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