Minimizing the radiated sound power from vibrating plates by using in-plane functionally graded materials

Alshabatat, Nabeel; Naghshineh, Koorosh

doi:10.21595/jve.2020.21621

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…is the stiffness coefficient of the interlayer magnetic equivalent spring. From equations (11) and (12), it can be seen that from a microscopic point of view, the magnetic equivalent spring stiffness between adjacent particle layers in the MRF changes gradually, and on a macroscopic level, the material parameters of the MRF can be considered to change continuously to form a gradient material. The variation law of the interlayer magnetic equivalent spring stiffness K i −1,1 in the MRF under the action of the TMF is shown in figure 8.…”

Section: Determination Of Equivalent Stiffness Coefficients Between P...mentioning

confidence: 99%

“…Chen et al [9] and Chen et al [10] investigated the vibration characteristics of conical gradient beams and gradient porous material parallelogram plates of variable thickness, respectively, and determined the effect of gradient distribution of material parameters on them. Alshabatat and Naghshineh [11] constructed a functional gradient plate and investigated its vibration and acoustic radiation characteristics. The results show that the gradient plate can significantly reduce sound power more than an isotropic plate.…”

Section: Introductionmentioning

confidence: 99%

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A novel adjustable magnetorheological fluid gradient material of low frequency vibration isolation: a theoretical and experimental study

Sun,

Zhao,

Dong

et al. 2024

Smart Mater. Struct.

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In this paper, a novel adjustable magnetorheological fluid (MRF) gradient material for low-frequency control is proposed, and the vibration isolation performance of this gradient material is investigated theoretically and experimentally. The gradient material has an excellent ability to control the sound waves and vibrations. However, the currently prepared gradient material does not have the parameter adjustability. At the same time, the MRF can change its material parameters according to the external magnetic field. After applying the traveling magnetic field (TMF) to the MRF with continuously varying and adjustable magnetic induction strength, its material parameters will also be continuously varying and adjustable to constitute an adjustable gradient material. In order to investigate the vibration transfer characteristics of this adjustable gradient material, this paper establishes a micro-mechanical model of MRF and theoretically investigates and numerically calculates the mechanical impedance and vibration transfer characteristics of the adjustable gradient material through the machine-electric analogy theory. At the same time, experimental research was conducted by building an experimental platform to conduct experiments. The results show that the novel adjustable gradient material composed of a TMF and MRF has a good vibration suppression effect in the low-frequency range (10~60Hz) with the vibration level difference of up to 30dB or more, which has a broad application prospect in the field of vibration control.

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Section: Determination Of Equivalent Stiffness Coefficients Between P...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel adjustable magnetorheological fluid gradient material of low frequency vibration isolation: a theoretical and experimental study

Sun,

Zhao,

Dong

et al. 2024

Smart Mater. Struct.

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“…3 In recent years, FGMs have been widely used in the field of machine design and manufacturing as they have strong designability and easy to realize multi-physics coupling. [4][5][6][7][8] Simultaneously, due to the excellent acoustic performance of FGMs, they are widely concerned by scholars employed as sound-absorbing materials. [9][10][11][12][13] When considering the good impedance matching characteristics of FGMs, FGMs can be widely used in the design of the underwater anechoic coating.…”

Section: Introductionmentioning

confidence: 99%

A hybrid acoustic structure for low-frequency and broadband underwater sound absorption

Jia

Jin

Shi

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

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The underwater anechoic coating with local resonant units is an effective method to achieve low-frequency sound absorption. However, the structure obtained in this way is not satisfactory in the sound absorption effect of mid-high frequency bands. Capitalizing on the impedance gradient characteristics of functionally graded materials (FGMs) can improve the impedance matching between the structure and the medium, and enhance the dissipation of sound waves inside the structure. Based on these, we propose an underwater acoustic structure, which can improve and obtain low-frequency and broadband sound absorption performance by embedding local resonators into FGMs. To reveal the sound-absorbing mechanism and further optimize the low-frequency absorption performance of the structure, we conduct quantitative analyses on the parameters of FGMs, the materials and forms of resonators. The results indicate that by appropriately adjusting the studied parameters, different low-frequency sound-absorbing peak can be obtained and the absorption effects are also further improved.

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“…These continuous variations of compositions results in a smooth variation of material properties. Owing to their distinct characteristics, FGMs are used in the design optimization of structures [26][27][28]. Several researchers investigated the free vibration of thin-walled FGMs cylindrical shells.…”

Section: Introductionmentioning

confidence: 99%

Natural Frequencies Optimization of Thin-Walled Circular Cylindrical Shells Using Axially Functionally Graded Materials

Alshabatat

2022

Materials

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One method to avoid vibration resonance is shifting natural frequencies far away from excitation frequencies. This study investigates optimizing the natural frequencies of circular cylindrical shells using axially functionally graded materials. The constituents of functionally graded materials (FGMs) vary continuously in the longitudinal direction based on a trigonometric law or using interpolation of volume fractions at control points. The spatial change of material properties alters structural stiffness and mass, which then affects the structure’s natural frequencies. The local material properties at any place in the structure are obtained using Voigt model. First-order shear deformation theory and finite element method are used for estimating natural frequencies, and a genetic algorithm is used for optimizing material volume fractions. To demonstrate the proposed method, two optimization problems are presented. The goal of the first one is to maximize the fundamental frequency of an FGM cylindrical shell by optimizing the material volume fractions. In the second problem, we attempt to find the optimal material distribution that maximizes the distance between two adjoining natural frequencies. The optimization examples show that building cylindrical shells using axially FGM is a useful technique for optimizing their natural frequencies.

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Minimizing the radiated sound power from vibrating plates by using in-plane functionally graded materials

Cited by 4 publications

References 41 publications

A novel adjustable magnetorheological fluid gradient material of low frequency vibration isolation: a theoretical and experimental study

A novel adjustable magnetorheological fluid gradient material of low frequency vibration isolation: a theoretical and experimental study

A hybrid acoustic structure for low-frequency and broadband underwater sound absorption

Natural Frequencies Optimization of Thin-Walled Circular Cylindrical Shells Using Axially Functionally Graded Materials

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