Numerical simulation of impact sound transmission control across a smart hybrid double floor system equipped with a genetically-optimized NES absorber

Hasheminejad, Seyyed M.; Vesal, Rahim

doi:10.1016/j.apacoust.2021.108179

Cited by 4 publications

(2 citation statements)

References 70 publications

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“…However, nonlinear resonators may also offer compelling performance characteristics that contribute to a diverse array of interesting phenomena. For example, the integration of a primary linear system with a nonlinear resonator offers opportunities to improve vibration mitigation through kinetic energy pumping [1][2][3] or addressing vibro-acoustic challenges by targeted energy transfer [4]. Despite the promising potential demonstrated by tunable nonlinear acoustic resonators, particularly in the context of enhanced active sound absorption [5], their comprehensive exploration and understanding have not been extensively pursued, revealing a notable research gap except for a limited number of recent investigations [6].…”

Section: Introductionmentioning

confidence: 99%

Initial Conditions Impact on Nonlinear Dynamics of a Loudspeaker

Vesal,

Guo,

Lissek

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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In contrast with linear systems, forced oscillations at particular frequencies may result in more than one stable limit cycle in the dynamic response of a nonlinear system. Also known as jump phenomenon, in these frequency regions, a nonlinear system would exhibit various dynamic behaviors critically depending on the initial conditions. The current study investigates the impact of initial conditions on nonlinear oscillations of an acoustically excited electroacoustic viscoelastic membrane. Accordingly, a mathematical model is developed to simulate the nonlinear dynamics of the membrane, and the method of multiple scales is then utilized to solve the governing equation of motion of the system. Frequency response of the system is extracted to examine the effect of system nonlinearity level on jump phenomenon. Various combinations for initial states of the membrane are taken into consideration, and corresponding phase portraits are provided to study the dynamic response of the system in the jump region. Finally, basins of attraction for stable oscillations are mapped in a plane spanned by initial conditions of the system for different excitation frequencies.

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Section: Introductionmentioning

confidence: 99%

Initial Conditions Impact on Nonlinear Dynamics of a Loudspeaker

Vesal,

Guo,

Lissek

2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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“…When the source of vibrations (road, tram or railway) is under construction, the simplest and most common legal obligation [15,16] is to isolate it from the environment, for example by using subballast mats. When the source already exists and the building is under construction, the building should be designed to meet all comfort requirements by using either vibroinsulating barriers in the ground [17] or a vibroacoustic floor [18,19]. The first of these two solutions is quite expensive, and the building owner must have the right to the land in the direction of propagation in order to build such a large structure.…”

Section: Introductionmentioning

confidence: 99%

Determination of Vibroacoustic Parameters of Polyurethane Mats for Residential Building Purposes

Nering

Kowalska-Koczwara

2022

Polymers

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This paper is aimed at investigating the use of polyurethane mats, usually used as ballast mats, for residential building purposes. Ballast mats have features that may improve the vibroacoustic comfort in residential rooms. Their strength is certainly an advantage, along with vibration and acoustic insulation. However, the problem that an engineer has to deal with, for example in modeling these types of mats, is a limited knowledge of the material’s vibroacoustic parameters. Knowledge of these may be useful for residential buildings. This paper presents measurements of the vibroacoustic parameters of polyurethane mats, together with a suitable methodology and some results and analysis. The two main material parameters responsible for vibroacoustic protection were measured: the dynamic stiffness, which is related to the acoustic properties of the material, and the critical damping coefficient, which is obviously responsible for damping. The measurement methodology is clearly described. A total of five polyurethane materials with different densities were tested. It was possible to identify a relationship between the material density and the vibroacoustic parameters, which could offer an indication of which material to use, depending on the stimulus affecting a human in a given location.

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Smart hybrid VIV control of a linearly sprung cylinder using an internal semi-active NES-based vibration absorber coupled with two active rotating wake-control rods

Hasheminejad

Masoumi

2022

Ocean Engineering

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Numerical simulation of impact sound transmission control across a smart hybrid double floor system equipped with a genetically-optimized NES absorber

Cited by 4 publications

References 70 publications

Initial Conditions Impact on Nonlinear Dynamics of a Loudspeaker

Initial Conditions Impact on Nonlinear Dynamics of a Loudspeaker

Determination of Vibroacoustic Parameters of Polyurethane Mats for Residential Building Purposes

Smart hybrid VIV control of a linearly sprung cylinder using an internal semi-active NES-based vibration absorber coupled with two active rotating wake-control rods

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