Sandwich Plate Structure Periodically Attached by S-Shaped Oscillators for Low Frequency Ship Vibration Isolation

Locally resonant phononic crystals are a kind of artificial periodic composite material/structure with an elastic wave band gap that show attractive application potential in low-frequency vibration control. For low-frequency vibration control problems of ship power systems, this paper proposes a pho...

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Bibliographic Details
Published in:Materials 2023-03, Vol.16 (6), p.2467
Main Authors: Shen, Chaoming, Huang, Jie, Zhang, Zexin, Xue, Jingya, Qian, Denghui
Format: Article
Language:English
Subjects:
Boundary conditions
Composite materials
Coupled modes
Crystal structure
Crystals
Design
Elastic waves
Electronic equipment
Energy gap
Engineering
Finite element analysis
Finite element method
Mathematical analysis
Noise control
Numerical analysis
Oscillators
Periodic structures
Propagation
Radiation
Sandwich structures
Shipping industry
Simulation methods
Steel plates
Structure
Vibration control
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Summary:Locally resonant phononic crystals are a kind of artificial periodic composite material/structure with an elastic wave band gap that show attractive application potential in low-frequency vibration control. For low-frequency vibration control problems of ship power systems, this paper proposes a phononic crystal board structure, and based on the Bloch theorem of periodic structure, it uses a finite element method to calculate the band structure and the displacement fields corresponding to the characteristic mode and vibration transmission curve of the corresponding finite periodic sandwich plate structure, and the band gap characteristics are studied. The mechanism of band gap formation is mainly attributed to the mode coupling of the phononic crystal plate structure. Numerical results show that the sandwich plate structure has a double periodicity, so it has a multi-stage elastic wave band gap, which can fully inhibit the transmission of flexural waves and isolate the low-frequency flexural vibration. The experimental measurements of flexural vibration transmission spectra were conducted to validate the accuracy and reliability of the numerical calculation method. On this basis, the potential application of the proposed vibration isolation method in a marine power system is discussed. A vibration isolation platform mounted on a steel plate is studied by numerical simulation, which can isolate low-frequency vibration to protect electronic equipment and precision instruments.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16062467