Dynamic property investigation of segmented acoustic black hole beam with different power-law thicknesses

Fu, Qidi; Du, Xiaofei; Wu, Jianwei; Zhang, Jianrun

doi:10.1088/1361-665x/abed32

Cited by 13 publications

(4 citation statements)

References 25 publications

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“…When the flexural wave propagates from the uniform region of the ABH plate to the ABH region, as the thickness of the plate decreases sharply with a power exponent, the velocity of the flexural wave will also gradually decrease, so as to achieve the concentration effect of the flexural wave. Utilizing the aggregation effect of the ABHs on the flexural wave, the vibration suppression of the rectangular plate can be achieved [8]. The second-order tetrahedral unit C3D10 is used to mesh the damping ABH support plate.…”

Section: Fem Simulation Of the Rectangular Plate Embedded With Abhsmentioning

confidence: 99%

Effect of acoustic black hole parameters on vibration suppression of rectangular plate

Du¹,

Gu²

2022

Vib. proced.

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The acoustic black hole has the ability to gather and manipulate the flexural wave in the structure, and can be used to achieve vibration suppression of the structure. A group of FEM models for the vibration analysis of the rectangular plate embedded with acoustic black holes were established in this paper. Four monitoring points on the ABH plate were selected to calculate their vibration velocity response in 100 Hz-3 kHz frequency interval. In order to study the effects of acoustic black hole geometric parameters and damping layer geometric parameters on the vibration response of the ABH plate, 15 combinations of different parameters of the maximum ABH diameter, the truncated thickness of the ABH, the power index of the ABH, and the damping layer thickness, the maximum diameter of the damping layer were selected to calculate the vibration velocity response of the four monitoring points. The calculation result can help us understand the effects of acoustic black hole geometric parameters and damping layer geometric parameters on the vibration suppression of rectangular plate.

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Section: Fem Simulation Of the Rectangular Plate Embedded With Abhsmentioning

confidence: 99%

Effect of acoustic black hole parameters on vibration suppression of rectangular plate

Du¹,

Gu²

2022

Vib. proced.

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“…If bending wave propagates in ABH, along with the thickness of the structure decreasing to zero, the wavelength is compressed, the wave velocity decreases, and the refection does not occur at the location where thickness is zero, thus forming local energy accumulation [1][2][3]. With the deepening research of dynamics analysis theory for ABH [4,5], ABH also shows great potential for vibration and noise control [6][7][8][9][10][11][12][13][14][15], energy harvesting [16][17][18], and bending wave manipulation [19][20][21]. With the help of pasting piezoelectric sensors, vibration energy is transferred into electrical energy and the purpose of energy harvesting is achieved [22].…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence Factors on Harvesting Capacity of a Piezoelectric Vibration Energy Harvesting System Covered on Curved Beam with Acoustic Black Hole

Xie,

Gao,

Zhang

et al. 2023

Shock and Vibration

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The acoustic black hole (ABH) structures have been shown to have great potential for energy harvesting. Within an ABH, the bending wave velocity decreases rapidly and the phase accumulates, resulting in localised energy accumulation. It is very significant that the energy can be harvested and power can be supplied for microelectronic devices. How to improve energy harvesting capacity is a problem that needs to be solved. Previous research on energy harvesting capacity of straight beams and flat plates with ABH has yielded a wealth of results. However, in practical engineering, curved beams are also commonly found. Given the differences in structure, it is of practical significance to study the influence factors on harvesting capacity of the piezoelectric vibration energy harvesting system covered on curved beam with acoustic black hole. First, the vibration characteristics of curved beam with ABH are analysed by the finite element method and localised energy accumulation is observed. Then, energy harvesting capacity is studied by means of the electromechanical coupling model in FEA; it has been found that energy harvesting capacity is lower in high frequency. The reason of this problem is analysed and solved by dividing the size of the piezoelectric sheet in an array layout. Based on this, the influence of array layout of piezoelectric cells on the energy harvesting capacity of the system is focused on. In addition, the influence of resistance value, material property, and curvature of curved beam on the energy harvesting capacity is analysed. Some meaningful results are obtained. These results provide the guidance to the design and optimisation for an energy harvesting system covered on curved beam with ABH.

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“…The existing research on ABHs is more concentrated on the vibrational characteristics of different forms of acoustic black hole structures [11][12][13][14], while the acoustical and vibroacoustic characteristics of ABH structures are also an important research direction. Bowyer et al conducted experiments and found that the noise in the engine compartment will be decreased by 6.5 dB after the car engine housing is embedded with the two-dimensional ABH [15].…”

Section: Introductionmentioning

confidence: 99%

Vibro-Acoustic Analysis of Rectangular Plate-Cavity Parallelepiped Coupling System Embedded with 2D Acoustic Black Holes

Liao

et al. 2022

Applied Sciences

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An acoustic black hole (ABH) has the ability to concentrate and manipulate flexural waves, which can be used for structural vibration suppression and noise attenuation. In this paper, a 2D ABH rectangular plate is designed and a 2D ABH plate-cavity coupling system is constructed using the 2D ABH plate and five rectangular elastic plates of uniform thickness. Series of vibro-acoustic FEM models of the plate-cavity parallelepiped coupling system embedded with 2D ABHs are established, and the vibro-acoustic coupling simulation is conducted to analyze the effects of ABHs on the coupling modes, vibro-acoustic coupling characteristics, and mechanism of ABHs and the damping layer. It is shown that at most frequencies in the range of 3600~5000 Hz, the damping 2D ABH plate-cavity parallelepiped coupling system can significantly suppress the sound pressure and greatly reduce the peak values. It is also found that the significant reduction of the participation factor of the acoustic modes within the 100th order is the main mechanism for the obvious suppression of the sound pressure in the damping ABH plate-cavity coupling system at 3701 Hz. Finally, an experimental platform of vibro-acoustic measurement of the 2D ABH coupling system is constructed, and the accuracy of the vibro-acoustic FEM models of the 2D ABH coupling systems established in this paper and the numerical simulation calculation are verified by the vibro-acoustic measurement experiment.

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Dynamic property investigation of segmented acoustic black hole beam with different power-law thicknesses

Cited by 13 publications

References 25 publications

Effect of acoustic black hole parameters on vibration suppression of rectangular plate

Effect of acoustic black hole parameters on vibration suppression of rectangular plate

Study on the Influence Factors on Harvesting Capacity of a Piezoelectric Vibration Energy Harvesting System Covered on Curved Beam with Acoustic Black Hole

Vibro-Acoustic Analysis of Rectangular Plate-Cavity Parallelepiped Coupling System Embedded with 2D Acoustic Black Holes

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