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| Band gap characteristics analysis of a phononic crystal double-layer beam structure based on multi-layer S-type local oscillator |
| SHEN Chaoming1,HUANG Jie1,CHEN Molin1,QIAN Denghui1,WANG Jianchun2,ZHUANG Jiawei1 |
1.School of Naval Architecture & Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212100, China;
2.China Ship Scientific Research Center, Wuxi 214082, China |
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Abstract To suppress the propagation of vibration and noise in engineering, a kind of phononic crystal beam structure was designed. Based on the Bloch theorem of periodic structure, the band structures,displacement fields of eigenmodes and transmission power spectrums of the corresponding finite periodic phononic crystal beam structure are calculated by a finite element method. And the band gap characteristics of its display is studied. Based on the main mechanism of local resonant band gap formation, the phononic crystal beam structure of low frequency vibration and noise control is studied, which can be applied to the vibration and noise reduction of specific frequency in engineering. The band gap characteristics of phononic crystal veneer beam and phononic crystal double-layer beam are analyzed, and the commonness of phononic crystal single/double layer beam is studied. The influence of various parameters on the band gap attenuation band of phononic crystal beam structure is studied, and the low frequency vibration isolation in a specific range can be realized through reasonable design of parameters, which has a good application prospect in the field of vibration and noise of ships and other engineering.
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Received: 14 October 2021
Published: 28 January 2023
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