Abstract
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.
Highlights
With the rapid development of transportation, the noise inside the cabin has attracted people’s attention
The multi-degree-of freedoms (DOF) nonlinear energy sink (NES) was more effective than the one DOF NES because it can absorb the energy of multifrequencies of the primary system
This paper presents an overview of the NES for low-frequency control inside the acoustic cavities, including the nonlinear characteristics of the NES, the main theoretical research methods, application researches of vibration and noise control, and on the discussion of the application of the NES for the control of low-frequency noise inside three-dimensional acoustic cavities
Summary
With the rapid development of transportation, the noise inside the cabin has attracted people’s attention. The control technology of low-frequency noise inside the three-dimensional acoustic cavity is mainly concentrated in three aspects: noise source, transmission path, and receiver. The concept of tuned vibration absorber was first proposed by Hermann[29] and later Omiondroyd[30] improved the structure of tuned vibration absorber. It achieves vibration suppression by attaching an additional mass to the main structure with the appropriate spring stiffness. Because the NES as a nonlinear vibration absorber can improve the work frequency range,[10] the nonlinear characteristics of the NES have been utilized to control the vibration and noise of low frequency. The NES mainly includes two configuration NESs, which are grounded NESs3,22,31,32 and ungrounded NESs.[10,24,33,34] Figure 1 shows the example of an ungrounded NES and a grounded NES respectively coupling a linear primary structure. x1; x2 are the displacement of the primary structure and the NES, respectively
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