Nonlinear energy sink applied for low-frequency noise control inside acoustic cavities: A review

In recent years, the research of nonlinear energy sink on low-frequency noise control has become a hotspot. By adding a nonlinear energy sink into one primary system, it is possible to obtain the significant target energy transfer characteristics. The target energy transfer can be defined for which the vibration energy of the primary structure is irreversibly transferred to the nonlinear energy sink, quickly concentrated in the nonlinear energy sink and dissipated by the nonlinear energy sink damping. This method has significant advantages to control the broadband low-frequency noise inside the transportations (such as cars, trains, airplanes, etc.). Compared with traditional noise reduction methods such as adding the damping and acoustical materials, the nonlinear energy sink has a simple and lightweight structure. The paper reviews the nonlinear characteristics of the nonlinear energy sink, the main theoretical research methods and the applications of vibration and noise control, and discusses the application of the nonlinear energy sink for the control of low-frequency noise inside the three-dimensional acoustic cavities, which provides the reference and guidance for the low-frequency noise control inside the acoustic cavities of the mean of transportation.

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Study on target energy transfer of 3D acoustic cavity - plate coupling system with the membrane nonlinear energy sink

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-3986 ◽

2021 ◽

Vol 263 (1) ◽

pp. 5891-5901

Author(s):

Jinmeng Yang ◽

JianWang Shao ◽

GuoMing Deng ◽

Xian Wu

Keyword(s):

Energy Transfer ◽

Sound Pressure ◽

Single Point ◽

Nonlinear Energy Sink ◽

Coefficient Matrix ◽

Acoustic Medium ◽

Acoustic Cavity ◽

Target Energy ◽

Energy Sink ◽

Nonlinear Energy

The target energy transfer (TET) between a membrane nonlinear energy sink (NES) and the acoustic medium inside a rectangular cavity is studied. The acoustic medium is interacted with a plate and multi-order modes coupling of the 2 structure is considered. Based on the modal expansion approach, with Green's function, Helmholtz equation and the boundary conditions of the acoustic medium and the plate, the coupling coefficient matrix of the mode of 2 structures is derived. The equations of the membrane NES, multi-order modes of the acoustic medium and multi-order modes of the plate are established, and numerical analysis is used to investigate the TET phenomenon. The results show that in condition of a single-point excitation to the plate, under a certain range of excitation levels, the membrane can be seen as a kind of NES, and the energy in the acoustic medium can be unidirectionally transmitted to the membrane NES and attenuated, reducing the sound pressure level in the cavity. At the same time, it is found that the NES can suppress multi-order sound pressure of the acoustic medium at the same time, and realize the control of cascaded resonance noise.

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TARGETED ENERGY TRANSFER BY A DOUBLE-WELL POTENTIAL NONLINEAR ENERGY SINK FOR STRUCTURAL SEISMIC CONTROL

10.37153/2686-7974-2019-16-1023-1040 ◽

2019 ◽

Author(s):

Yangyang CHEN ◽

Zhichao QIAN ◽

Ping TAN ◽

Xiangyun HUANG

Keyword(s):

Energy Transfer ◽

Nonlinear Energy Sink ◽

Targeted Energy Transfer ◽

Seismic Control ◽

Energy Sink ◽

Double Well Potential ◽

Nonlinear Energy

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Targeted Energy Transfer to a Rotary Nonlinear Energy Sink

Volume 5: 22nd International Conference on Design Theory and Methodology; Special Conference on Mechanical Vibration and Noise ◽

10.1115/detc2010-28840 ◽

2010 ◽

Cited By ~ 1

Author(s):

Sean A. Hubbard ◽

D. Michael McFarland ◽

Alexander F. Vakakis ◽

Lawrence A. Bergman

Keyword(s):

Finite Element ◽

Energy Transfer ◽

Finite Element Model ◽

Nonlinear Energy Sink ◽

Element Model ◽

Targeted Energy Transfer ◽

Discrete Equations ◽

Resonant Interactions ◽

Energy Sink ◽

Nonlinear Energy

We study computationally the passive, nonlinear targeted energy transfers induced by resonant interactions between a single-degree-of-freedom nonlinear energy sink and a uniform-plate model of a flexible, swept aircraft wing. We show that the nonlinear energy sink can be designed to quickly and efficiently absorb energy from one or more wing modes in a completely passive manner. Results indicate that it is feasible to use such a device to suppress or prevent aeroelastic instabilities like limit-cycle oscillations. The design of a compact nonlinear energy sink is introduced and the parameters of the device are examined. Simulations performed using a finite-element model of the wing coupled to discrete equations governing the energy sink indicate that targeted energy transfer is achievable, resulting, for example, in a rapid and significant reduction in the second bending mode response of the wing. Finally, the finite element model is used to simulate the effects of increased nonlinear energy sink stiffness, and to show the conditions under which the nonlinear energy sink will resonantly interact with higher-frequency wing modes.

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Low-frequency noise control using layered granular aerogel and limp porous media

INTER-NOISE and NOISE-CON Congress and Conference Proceedings ◽

10.3397/in-2021-2215 ◽

2021 ◽

Vol 263 (4) ◽

pp. 2724-2729

Author(s):

Yutong Xue ◽

Amrutha Dasyam ◽

J. Stuart Bolton ◽

Bhisham Sharma

Keyword(s):

Noise Control ◽

Glass Fibers ◽

Low Frequency ◽

Normal Incidence ◽

Frequency Noise ◽

Fibrous Materials ◽

Low Frequency Noise ◽

Frequency Range ◽

Fibrous Media ◽

Impedance Tube Method

The acoustic absorption of granular aerogel layers with a granule sizes in the range of 2 to 40 μm is dominated by narrow-banded, high absorption regions in the low-frequency range and by reduced absorption values at higher frequencies. In this paper, we investigate the possibility of developing new, low-frequency noise reduction materials by layering granular aerogels with traditional porous sound absorbing materials such as glass fibers. The acoustic behavior of the layered configurations is predicted using the arbitrary coefficient method, wherein the granular aerogel layers are modeled as an equivalent poro-elastic material while the fibrous media and membrane are modeled as limp media. The analytical predictions are verified using experimental measurements conducted using the normal incidence, two-microphone impedance tube method. Our results show that layered configurations including granular aerogels, fibrous materials, and limp membranes provide enhanced sound absorption properties that can be tuned for specific noise control applications over a broad frequency range.

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Nonlinear Energy Sinks With Nontraditional Kinds of Nonlinear Restoring Forces

Journal of Vibration and Acoustics ◽

10.1115/1.4035479 ◽

2017 ◽

Vol 139 (2) ◽

Cited By ~ 19

Author(s):

Mohammad A. AL-Shudeifat

Keyword(s):

Energy Transfer ◽

Nonlinear Energy Sink ◽

Nonlinear Coupling ◽

Closed Loops ◽

Strong Resonance ◽

Shock Mitigation ◽

Restoring Forces ◽

Initial Shock ◽

Energy Sink ◽

Nonlinear Energy

The nonlinear energy sink (NES) is usually coupled with a linear oscillator (LO) to rapidly transfer and immediately dissipate a significant portion of the initial shock energy induced into the LO. This passive energy transfer and dissipation are usually achieved through strong resonance captures between the NES and the LO responses. Here, a nontraditional set of nonlinear coupling restoring forces is numerically investigated to introduce enhanced versions of the NESs. In this new set of nonlinear coupling restoring forces, one has a varying nonlinear stiffness that includes both of hardening and softening stiffness components during the oscillation, which appear in closed-loops under the effect of the damping. The obtained results by the numerical simulation have shown that employing this kind of the nonlinear restoring forces for passive targeted energy transfer (TET) is promising for shock mitigation.

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