1.School of Naval Architecture and Ocean Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
2.China Ship Development and Design Center, Wuhan 430064, China
Abstract：To suppress low frequency vibrations in typical plate and shell structures of ships, this paper designs a cantilever beam phononic structure based on local resonance theory. The bandgap mechanism is revealed by numerical calculations to investigate the influence of dimensional parameter on the bandgap characteristics. In addition, natural frequency gradients approach is proposed based on the Functional Gradient Materials method, which can effectively widen the low frequency forbidden band range. Finally, vibration characteristics tests were designed and analysed for error reasons. The results show that: The longer the edge length of the cantilever beam, the narrower the band gap width. As the width and thickness of the cantilever beam increases, the band gap width widens. In the natural frequency gradient method, the band gap range is effectively widened when the overall rate of change is less than 8.1%. When the rate of change of adjacent natural frequencies is more than 12.27%, a multi-frequency band gap characteristic can be presented; increasing the number of cantilever beam installations can further widen the forbidden band range on the basis of the natural frequency gradient, and the research results can provide reference for the vibration isolation design of ship shell structures.
徐庚辉1，肖汉林2，张琳1，王雨桐1，张涛1. 基于FGMs的声子晶体带隙调控及振动特性研究[J]. 振动与冲击, 2024, 43(10): 89-97.
XU Genghui1，XIAO Hanlin2，ZHANG Lin1，WANG Yutong1，ZHANG Tao1. Investigation on the tunable band-gap and vibration characteristics of phononic crystals based on FGMs. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(10): 89-97.
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