Journal of Sound and Vibration最新文献

英文中文

Impact of constrained layer damping patches on the dynamic behavior of a turbofan bladed disk

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-24 DOI: 10.1016/j.jsv.2025.119002

Matteo Couet , Jean-François Deü , Lucie Rouleau , Fabrice Thouverez , Marion Gruin

This work introduces a novel approach to modeling the impact of constrained layer damping patches on the behavior of rotating host structures, with a focus on bladed disks of turbofan engines. Constrained layer damping patches increase structural damping by dissipating the vibratory energy of the structure into heat through the viscoelastic properties of the elastomer material used in the patch. This paper proposes a dedicated numerical tool to model the behavior of such structures. A hyperelastic model is introduced to model the static response of the elastomer and a viscoelastic model is introduced into the dynamic problem. This hyperelastic–viscoelastic framework allows the modeling of the response of the constrained layer damping patch to large centrifugal forces and small dynamic perturbations. The dynamic behavior of an industrial bladed disk is then computed within this framework and compared to experimental test data. The results of this comparison validates the proposed model and highlights the efficiency of the constrained layer damping patch, defined as the amount of damping added to the structure, for this type of structures.

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引用次数: 0

Multiple acoustic sources localization in a water tunnel using the modal theory

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-14 DOI: 10.1016/j.jsv.2025.118975

R. Boucheron

The underwater radiated noise of a ship is of particular interest since several decades. This is due to the concern of acoustic stealth in military applications but not only: its influence on marine life has seen an increasing preoccupation recently. It exists two main ways to estimate the future radiated noise of a boat: performing experimental tests at a model-scale (the preferred approach still now) and computing the radiated noise by numerical methods. These latter are still suffering of low accuracy even if important recent progresses are encouraging for the future. The experimental approach consists of performing measurements in a hydro-acoustic tunnel with a faithful model and scaling the results obtained to the full-scale. Among many details that could generate in-accuracy of the prediction, we focus on the localization of the sources at the model-scale step. We propose to use the modal approach to determine the position of the sources, their magnitudes and phase. Results of computations are then presented. The method appears efficient especially at low frequencies for which the modal approach is designed for. This novel approach allows the determination of the number of sources present in a section of a cavitation tunnel. The acoustic fields computed thanks to the results provided by the method is very accurate.

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引用次数: 0

Elucidating negative capacitance design in piezoelectric circuitry to facilitate vibration suppression enhancement assisted by energy harvesting

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-13 DOI: 10.1016/j.jsv.2025.119000

Ting Wang , J. Tang

Owing to their two-way electro-mechanical coupling, piezoelectric transducers have been widely used in vibration control and energy harvesting systems, the performance of which can be boosted by circuitry integrations. Inductive shunt generally benefits the system performance around the resonant frequencies, and op-amp based negative capacitance (NC) element can increase the apparent electro-mechanical coupling by offsetting the piezoelectric inherent capacitance. This research aims at elucidating the NC design in an integrated piezoelectric inductive shunt for simultaneous vibration suppression enhancement and energy harvesting. In particular, the new concept is to leverage the energy harvesting capacity of the piezoelectric circuitry to supply power to a rechargeable battery to drive the NC element, thereby leading to a new design that enhances passive vibration suppression without requesting external power supply. An analytical model that links the NC internal parameters with the system-level responses including vibration suppression enhancement and energy harvesting is presented. The influence of NC internal parameters is analyzed, aiming at improving vibration suppression while maintaining the positive net power which is the difference between the power generated through energy harvesting and the power consumed by the NC element. The design boundaries and uncertainty effects are examined. The analytical results are demonstrated and validated through experiment. This research reveals the potential of a self-sustainable, integrated piezoelectric circuitry for vibration suppression enhancement. The systematic analysis of NC element can be extended to a variety of designs of vibration/wave control utilizing piezoelectric circuitry.

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引用次数: 0

Prediction of sound transmission through plates using spectral Gaussian basis functions and application to plates with periodic acoustic black holes

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-12 DOI: 10.1016/j.jsv.2025.118952

Yi Yang , Michael Kingan , Brian Mace

In this study, we present a wave-based model for investigating sound transmission through infinite plates featuring periodically embedded acoustic black hole (ABH) cells. The model represents the transverse motion of the structure and its radiated acoustic pressures as a sum of harmonic components. The transverse displacement of the structure is periodic and modelled using spectral Gaussian basis functions. These basis functions then relate each displacement component to the periodic cells’ degrees of freedom. Expressions for the time-averaged kinetic and potential energy, as well as the external work done by the acoustic pressures, are derived. Subsequently, these energy formulations are used to establish the equation of motion of the system to determine its response to acoustic excitation. To validate the model and demonstrate its usefulness, two numerical examples of periodic plates with embedded rectangular cells, including those with flexible segments (FS) of constant thickness and ABH thickness profiles, are presented. The dispersion curves and sound transmission loss of the periodic plates with FS are calculated using the proposed model and verified by comparing the results with a well-established wave and finite element (WFE) method. The proposed model is further applied to calculate sound transmission through the ABH plate with a complex cross-section profile. The wave modes and vibration patterns induced by acoustic waves acting on the periodic plates are also analysed. It is found that the periodic plate with a thin FS demonstrates sound insulation capabilities comparable to, or even superior to, those of the ABH plate. The periodic plates’ low- and mid-frequency transmission loss is primarily influenced by global modes, whereas local modes predominantly govern the high-frequency performance. The findings from this study provide valuable insights for designing lightweight plates that effectively reduce sound transmission, particularly at and above coincidence frequencies.

在这项研究中，我们提出了一种基于波的模型，用于研究声音通过具有周期性嵌入声学黑洞（ABH）单元的无限板传播的情况。该模型将结构的横向运动及其辐射声压表示为谐波分量之和。结构的横向位移是周期性的，并使用频谱高斯基函数进行建模。这些基函数将每个位移分量与周期单元的自由度相关联。推导出时间平均动能和势能的表达式，以及声压所做的外部功。随后，这些能量公式被用于建立系统的运动方程，以确定其对声学激励的响应。为了验证该模型并证明其实用性，介绍了两个带有嵌入式矩形单元的周期板的数值示例，包括具有恒定厚度的柔性段（FS）和 ABH 厚度轮廓的周期板。使用所提出的模型计算了带有柔性段的周期板的频散曲线和声音传输损耗，并将计算结果与成熟的波和有限元（WFE）方法进行了比较验证。提出的模型还被进一步应用于计算通过具有复杂截面轮廓的 ABH 板的声音传输。此外，还分析了声波作用于周期板时诱发的波模和振动模式。结果发现，薄 FS 周期板的隔音能力可与 ABH 板媲美，甚至更胜一筹。周期板的中低频传输损耗主要受全局模式的影响，而高频性能则主要受局部模式的影响。这项研究的结果为设计能有效降低声音传播（尤其是在重合频率及以上）的轻质板材提供了宝贵的启示。

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引用次数: 0

A theoretical analysis of thermoacoustics and combustion instability in annular combustors

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-08 DOI: 10.1016/j.jsv.2025.118992

Myunggon Yoon

A theoretical analysis of thermoacoustics and combustion instability for a general annular combustor is presented. The combustor consists of an annular plenum and an annular flame chamber, connected by a series of identical nozzles. By applying the discrete Fourier transform to the azimuthal coordinate, we develop a closed-form representation of combustor thermoacoustics as a transfer function matrix that maps vector-valued heat inputs to resulting velocity fluctuations. In the transformed coordinate system, the transfer function matrix is diagonalized, which allows acoustic resonance to be determined through a set of explicit scalar equations. Furthermore, by approximating these scalar equations, we identify the effects of the combustor’s geometry and steady operating conditions on acoustic resonance. Combining the thermoacoustic model with a general flame model enables the assessment of combustion instability through the resonance characteristics of a perturbed thermoacoustic model. Our theoretical findings are demonstrated with numerical examples.

引用次数: 0

Vibration damping of fiberglass honeycomb sandwich panels based on the acoustic black hole effect

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-07 DOI: 10.1016/j.jsv.2025.118991

Alex Besse, Patrick O’Donoughue, Omar Aklouche, Frédéric Ablitzer, Adrien Pelat, François Gautier

An Acoustic Black Hole (ABH) is a scatterer, embedded in a panel, allowing passive vibration control without adding mass. In practice, it is achieved by means of a local reduction in thickness (axisymmetric pit with a parabolic profile) and the addition of a thin viscoelastic coating in a central region of uniform thickness (plateau). The vibration absorption induced by the ABH, enables the design of stiff, light and non-resonant panels. In this paper, a study of the ABH effect for a sandwich panel made of a honeycomb core and fiberglass skins, which gives rise to both bending and shear effects is conducted. In particular, it is shown that the equations of motion of the thick, symmetrical sandwich panel with variable characteristics is obtained within the framework of the Nilsson’s theory. These equations lead to a sixth-order analytical model that is used to determine the dispersion curves of the sandwich and also to establish an analytical model of the ABH inserted in a sandwich panel. Experimental tests postproceed by two complementary inverse methods are used to characterize the sandwich’s mechanical properties. In particular, the model powered by experimentally determined parameters is used to analyze the effect of shear on the ABH effect, and to demonstrate that shear-induced softening is beneficial to ABH-induced absorption.

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引用次数: 0

Body wave to surface wave conversion using tailored meta-structures

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-02-05 DOI: 10.1016/j.jsv.2025.118989

Rafael Fuentes-Domínguez , Richard J. Smith , Peng Jin , Marco Simonelli , Samuel Gibbon , Matt Clark

Elastic waves are important in many application areas. Their manipulation and coupling between different acoustic modes is important and presents a considerable challenge that offers to unlock the flexibility in wave transport required for efficient energy harvesting and vibration mitigation devices.

In this paper, we present a new class of metamaterial conversion devices consisting of arrays of “acoustic pipes” that can arbitrarily convert between different acoustic wavemodes. These pipes are used to match the modal patterns and phases between the two different elastic waves. The technique is fairly general and can be used to match any acoustic mode to any other acoustic mode provided an appropriate geometry can be formed.

Until recently the complexity of the geometries required has made the physical realisation of practical devices difficult because of the limitations of conventional fabrication processes but here we demonstrate practical devices made using additive manufacturing which can easily produce the complex topographies required for elastic waves around the MHz frequency region.

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引用次数: 0

A generic computer vision-based monocular six-degree-of-freedom displacement measurement method

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-01-30 DOI: 10.1016/j.jsv.2025.118990

Yize Wang, Zhenqing Liu

Monitoring six-degree-of-freedom (6-DOF) structural displacement via nondestructive measurement methods can help engineers assess structural safety. In this work, we propose a Unet3+ based six-degree-of-freedom Structural Displacement Measurement method (USSDM). It uses a UNet3+ fully convolutional deep learning network to extract targets from recorded videos. A corresponding displacement calculation method is proposed to replace conventional scale factor-based methods. The effects of the target edge width, edge length, brightness, and structural movement frequency on the accuracy and computational efficiency of the USSDM are experimentally examined. In this work, USSDM has average root-mean-square errors of 0.106 mm and 0.115

^{\circ}

in translational and rotational displacement measurements, respectively, and it has an FPS of 20.7. The USSDM can implement real-time and accurate 6-DOF displacement measurements. Its performance is compared with that of several existing methods. The attained models and codes are open for other researchers. Moreover, its potential applications and current limitations are discussed.

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引用次数: 0

Installation effects on airfoil self-noise estimated by direct numerical simulations

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-01-30 DOI: 10.1016/j.jsv.2025.118978

Ziyang Zhou , Stéphane Moreau , Marlène Sanjosé

Several Direct Numerical Simulations (DNS) have been achieved using the Lattice-Boltzmann Method (LBM) on a Controlled-Diffusion (CD) airfoil at

R e_{c} = 1.5 \times 1 0^{5}

and

α = 8 °

to evaluate installation effects on airfoil self-noise. 2D DNS provides unrealistic airfoil noise sources and a significant overprediction of the far-field noise with possibly a change in the ranking of the noise sources. Conversely, all 3D simulations of the airfoil immersed in the wind tunnel jet show excellent agreement with the flow around the airfoil and the far-field noise. Two new 3D DNS with some shear-layer refinement and possibly an additional zigzag trip to trigger turbulence have better resolved the jet development. Even though all 3D DNS identify two main noise sources, the laminar separation bubble (LSB) at the leading edge and the turbulent eddies at the trailing edge, their intensity varies because of a strong coupling between the jet and the airfoil that yields different LSB sizes, increased inlet turbulent intensity, oscillations of the angle-of-attack, and variations in the noise sources. The state of the jet shear layer at the nozzle exit of a given open-jet anechoic wind tunnel is seen to influence the flow field around the airfoil and its noise radiation, with potentially a larger jet contribution.

{"title":"Installation effects on airfoil self-noise estimated by direct numerical simulations","authors":"Ziyang Zhou , Stéphane Moreau , Marlène Sanjosé","doi":"10.1016/j.jsv.2025.118978","DOIUrl":"10.1016/j.jsv.2025.118978","url":null,"abstract":"<div><div>Several Direct Numerical Simulations (DNS) have been achieved using the Lattice-Boltzmann Method (LBM) on a Controlled-Diffusion (CD) airfoil at <span><math><mrow><mi>R</mi><msub><mrow><mi>e</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>=</mo><mn>1</mn><mo>.</mo><mn>5</mn><mo>×</mo><mn>1</mn><msup><mrow><mn>0</mn></mrow><mrow><mn>5</mn></mrow></msup></mrow></math></span> and <span><math><mrow><mi>α</mi><mo>=</mo><mn>8</mn><mo>°</mo></mrow></math></span> to evaluate installation effects on airfoil self-noise. 2D DNS provides unrealistic airfoil noise sources and a significant overprediction of the far-field noise with possibly a change in the ranking of the noise sources. Conversely, all 3D simulations of the airfoil immersed in the wind tunnel jet show excellent agreement with the flow around the airfoil and the far-field noise. Two new 3D DNS with some shear-layer refinement and possibly an additional zigzag trip to trigger turbulence have better resolved the jet development. Even though all 3D DNS identify two main noise sources, the laminar separation bubble (LSB) at the leading edge and the turbulent eddies at the trailing edge, their intensity varies because of a strong coupling between the jet and the airfoil that yields different LSB sizes, increased inlet turbulent intensity, oscillations of the angle-of-attack, and variations in the noise sources. The state of the jet shear layer at the nozzle exit of a given open-jet anechoic wind tunnel is seen to influence the flow field around the airfoil and its noise radiation, with potentially a larger jet contribution.</div></div>","PeriodicalId":17233,"journal":{"name":"Journal of Sound and Vibration","volume":"604 ","pages":"Article 118978"},"PeriodicalIF":4.3,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency dependent convergence rate of FXLMS in narrowband active noise control systems

IF 4.3 2区工程技术 Q1 ACOUSTICS

Journal of Sound and Vibration

Pub Date : 2025-01-28 DOI: 10.1016/j.jsv.2025.118988

Antonius Siswanto, Cheng-Yuan Chang

Direct, parallel, and direct/parallel form narrowband active noise control (NANC) systems use single or multiple adaptive filters adapted by the filtered-x least mean square (FXLMS) algorithms to cancel narrowband noises at several distinct frequencies. This paper analyzes the effects of the narrowband noises’ frequencies on the convergence rates of the FXLMS algorithms used in the direct, parallel, and direct/parallel form NANC systems. Theoretical analysis shows that the convergence rates for the given filter lengths are frequency dependent. This paper also establishes the conditions to achieve fast convergence for the NANC systems. Computer simulations verify the theoretical analysis.

引用次数: 0

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