Journal of Sound and Vibration

Journal: Journal of Sound and Vibration

Abbreviation

J. Sound Vib.

Publisher

Elsevier

ISSN

0022-460X
1095-8568

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Publications 1 - 10 of 35

Nonlinear dynamics of an acoustically compact orifice
Stoychev, Alexander K.; Noiray, Nicolas (2024)
Journal of Sound and Vibration
This work presents a three dimensional, reduced order model of the dynamics of an acoustically compact aperture, subject to an arbitrary pressure forcing. It provides the time evolution of the velocity profile across the orifice section as function of the dynamical pressure excitation. The volume flow can be deduced therefrom, and can thus provide predictions of the fundamental frequency based orifice impedance. The representation of the nonlinear aperture flow proposed here establishes a direct mathematical relation to the fundamental equations of fluid mechanics. This offers a better understanding of the dominant physical mechanisms governing the system's dynamics and allows for good a priori estimates without supporting experiments. The model assumes that the viscosity induced rotational component of the fluid motion can be reduced to a discontinuity at the in-flow plane of the thin orifice, without significantly influencing the normal velocity profile. This seemingly unconventional assumption is solely targeting the acoustics problem and is validated with direct numerical simulations (DNS) of the aperture flow, using a compressible solver of the Navier-Stokes equations. Apart from the DNS, the model predictions are also validated against well established experimental results from the literature.
EMetaNode: Electromechanical Friction-Induced Metamaterial Node for Broadband Vibration Attenuation and Self-powered Sensing
Zhao, Bao; Di Manici, Lorenzo; Ardito, Raffaele; et al. (2025)
Journal of Sound and Vibration
Recent advances in mechanical metamaterials and piezoelectric energy harvesting provide exciting opportunities for directing and converting mechanical energy in electromechanical systems for autonomous sensing and vibration control. However, practical realizations remain rare due to the lack of advanced modeling methods and persistent interdisciplinary barriers. By integrating mechanical metamaterials with power electronics-based interface circuits, this paper achieves a breakthrough by presenting an electromechanical friction-induced metamaterial node, which simultaneously enables self-powered sensing and broadband vibration attenuation. To support this, we introduce a reduced-order modeling framework combined with a numerical harmonic balance method tailored for nonlinear metamaterials. This approach efficiently captures local nonlinearities arising from electromechanical coupling through interface circuits, substantially improving computational efficiency. A key innovation of this work is that it uncovers the role of electromechanical friction, induced by synchronized switching interface circuits, which facilitates energy harvesting and enhanced nonlinear dynamic behaviorâ€”manifested through expanded bandgaps and higher-harmonic vibration attenuation. Experimentally, an electromechanical metamaterial node is realized for self-powered sensing of temperature and acceleration data, demonstrating strong potential for structural health monitoring and Internet of Things applications. This study provides a practical pathway toward digitizing structures and systems by uniting smart interface circuitry with mechanical metamaterials to achieve autonomous, energy-aware sensing and control.
Response to "Discussion of S. Ponsioen, S. Jain and G. Haller: 'Model reduction to spectral submanifolds and forced-response calculation in high-dimensional mechanical systems'"
Ponsioen, Sten; Jain, Shobhit; Haller, George (2025)
Journal of Sound and Vibration
We have reproduced our disputed simulation results from our original article as well as the simulations of the discussion article of Krack and Gross referenced above in the title. We have found several inaccuracies and omissions in the discussion article that invalidate its authors' main claims. We also briefly address inherent performance differences between the SSMTool and the NLvib algorithms to the benefit of the former.
A comparison of deterministic and Bayesian model updating frameworks for identifying offshore wind turbine foundation parameters
Simpson, Harry A.; Chatzi, Eleni; Chatzis, Manolis N. (2026)
Journal of Sound and Vibration
The rapid growth of the wind industry has resulted in larger wind turbines, whose modal properties lie in the lower frequency range. This has induced higher loads and stress cycles rendering accurate fatigue assessment increasingly important. Such assessment is highly affected by the precision in the estimation of turbine properties, including those related to the support conditions and foundation, which can be associated with high uncertainty. One approach to improve these estimates is to use structural monitoring data (e.g. from sensors mounted on the tower) to update the foundation parameters of offshore wind turbine models. However, the low identifiability of the parameters to be estimated can lead to divergent estimates across different fatigue estimation frameworks, which combined with the uncertainty inherent in the foundation properties, can compromise the reliable assessment of the remaining useful life. In this work, two Bayesian model updating frameworks are applied to update the foundation parameters of an offshore wind turbine and results are compared against a deterministic framework in a numerical example. The advantages and limitations of each framework are considered and the importance of accurately accounting for uncertainties as part of the model updating process is highlighted.
Mitigation of seismic waves: Metabarriers and metafoundations bench tested
Colombi, Andrea; Zaccherini, Rachele; Aguzzi, Giulia; et al. (2020)
Journal of Sound and Vibration
The article analyses two potential metamaterial designs, the metafoundation and the metabarrier, capable to attenuate seismic waves impact on buildings or structural components in a frequency band between 3.5 and 8 Hz. The metafoundation serves the dual purpose of reducing the seismic response and supporting the superstructure. Conversely the metabarrier surrounds and shields the structure from incoming waves. The two solutions are based on a cell layout of local resonators whose dynamic properties are tuned using finite element simulations combined with Bloch periodicity boundary conditions. To enlarge the attenuation band, a graded design where the resonant frequency of each cell varies spatially is employed. If appropriately enlarged or reduced, the metamaterial designs could attenuate lower frequency seismic waves or groundborne vibrations respectively. A sensitivity analysis over various design parameters including size, number of resonators, soil type and source directivity, carried out by computing full 3D numerical simulations in time domain for horizontal shear waves is proposed. Overall, the metamaterial solutions discussed here can reduce the spectral amplification of the superstructure by approx. 15–70% depending on several parameters such as the metastructure size and the properties of the soil. Pitfalls and advantages of each configuration are discussed in detail. The role of damping, crucial to avoid multiple resonant coupling, and the analogies between graded metamaterials and tuned mass dampers is also investigated. © 2020 Elsevier
Wave propagation characteristics of periodic structures accounting for the effect of their higher order inner material kinematics
Reda, Hilal; Karathanasopoulos, Nikolaos; Ganghoffer, Jean-François; et al. (2018)
Journal of Sound and Vibration
Stabilization of acoustic modes using Helmholtz and Quarter-Wave resonators tuned at exceptional points
Bourquard, Claire; Noiray, Nicolas (2019)
Journal of Sound and Vibration
Acoustic dampers are efficient and cost-effective means for suppressing thermoacoustic instabilities in combustion chambers. However, their design and the choice of their purging air mass flow is a challenging task, when one aims at ensuring thermoacoustic stability after their implementation. In the present experimental and theoretical study, Helmholtz (HH) and Quarter-Wave (QW) dampers are considered. A model for their acoustic impedance is derived and experimentally validated. In a second part, a thermoacoustic instability is mimicked by an electro-acoustic feedback loop in a rectangular cavity, to which the dampers are added. The length of the dampers can be adjusted, so that the system can be studied for tuned and detuned conditions. The stability of the coupled system is investigated experimentally and then analytically, which shows that for tuned dampers, the best stabilization is achieved at the exceptional point. The stabilization capabilities of HH and QW dampers are compared for given damper volume and purge mass flow.
A local basis approximation approach for nonlinear parametric model order reduction
Vlachas, Konstantinos; Tatsis, Konstantinos; Agathos, Konstantinos; et al. (2021)
Journal of Sound and Vibration
The efficient condition assessment of engineered systems requires the coupling of high fidelity models with data extracted from the state of the system ‘as-is’. In enabling this task, this paper implements a parametric Model Order Reduction (pMOR) scheme for nonlinear structural dynamics, and the particular case of material nonlinearity. A physics-based parametric representation is developed, incorporating dependencies on system properties and/or excitation characteristics. The pMOR formulation relies on use of a Proper Orthogonal Decomposition applied to a series of snapshots of the nonlinear dynamic response. A new approach to manifold interpolation is proposed, with interpolation taking place on the reduced coefficient matrix mapping local bases to a global one. We demonstrate the performance of this approach firstly on the simple example of a shear-frame structure, and secondly on the more complex 3D numerical case study of an wind turbine tower under a ground motion excitation. Parametric dependence pertains to structural properties, as well as the temporal and spectral characteristics of the applied excitation. The developed parametric Reduced Order Model (pROM) can be exploited for a number of tasks including monitoring and diagnostics, control of vibrating structures, and residual life estimation of critical components.
Exact nonlinear model reduction for a von Karman beam: Slow-fast decomposition and spectral submanifolds
Jain, Shobhit; Tiso, Paolo; Haller, George (2018)
Journal of Sound and Vibration
We apply two recently formulated mathematical techniques, Slow-Fast Decomposition (SFD) and Spectral Submanifold (SSM) reduction, to a von Kármán beam with geometric nonlinearities and viscoelastic damping. SFD identifies a global slow manifold in the full system which attracts solutions at rates faster than typical rates within the manifold. An SSM, the smoothest nonlinear continuation of a linear modal subspace, is then used to further reduce the beam equations within the slow manifold. This two-stage, mathematically exact procedure results in a drastic reduction of the finite-element beam model to a one-degree-of freedom nonlinear oscillator. We also introduce the technique of spectral quotient analysis, which gives the number of modes relevant for reduction as output rather than input to the reduction process.
Band gap transmission in periodic bistable mechanical systems
Frazier, Michael J.; Kochmann, Dennis M. (2017)
Journal of Sound and Vibration

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