| 多稳态夹芯金属压杆的滞后阻尼增强机制与被动减振性能 |
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| 引用本文： | 方辉,靳汉文,孟祥剑,段利亚.多稳态夹芯金属压杆的滞后阻尼增强机制与被动减振性能[J].海洋工程,2021,39(6):19-27. |
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| 作者姓名： | 方辉 靳汉文 孟祥剑 段利亚 |
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| 作者单位： | 中国海洋大学 工程学院 山东省海洋工程重点实验室, 山东 青岛 266100;齐鲁工业大学(山东省科学院) 海洋仪器仪表研究所, 山东 青岛 266061 |
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| 基金项目： | 国家自然科学基金项目（51979258） |
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| 摘 要： | 破碎波浪砰击于导管架等海洋工程结构，产生瞬态强载荷及长时振动。高刚度金属结构可抵抗瞬时强载，但金属固有阻尼极低而难以有效抑制振动，从而加剧结构损伤乃至失效。为使单一结构同时具有高刚度和高阻尼，设计一种多稳态夹芯金属压杆，有限元模拟表明该类压杆稳态随循环载荷依序转换，对应刚度变化使力—位移间产生滞后关系，使高刚度金属压杆具有高效耗散能力；采用夹芯结构弹性理论和发展变边界结构稳定理论，给出了该类压杆的稳态转换阈值和刚度变化过程，与有限元模拟一致；以有限元模拟方法获得了承载和阻尼特性的几何参数相关性；以该类压杆替换导管架斜撑，用有限元方法模拟瞬态强载下结构振动，计算结果表明多稳态夹芯金属压杆保证导管架高刚度同时显著增强了阻尼。
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| 关 键 词： | 夹芯压杆|多稳态|高刚度|增强阻尼|有限元 |
| 收稿时间： | 2020/10/19 0:00:00 |
Hysteretic damping enhancement mechanism and passive vibration reduction performance of multi-steady-state sandwich metal pressure bar |
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| FANG Hui,JIN Hanwen,MENG Xiangjian,DUAN Liya.Hysteretic damping enhancement mechanism and passive vibration reduction performance of multi-steady-state sandwich metal pressure bar[J].Ocean Engineering,2021,39(6):19-27. |
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| Authors: | FANG Hui JIN Hanwen MENG Xiangjian DUAN Liya |
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| Institution: | Shandong Province Key Laboratory for Ocean Engineering, School of Engineering, Ocean University of China, Qingdao 266100, China; Institute of Oceanographic Instrumentation, Qilu Univercity of Technology (Shandong Academy of Sciences), Qingdao 266061, China |
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| Abstract: | Waves breaking on offshore structures generates transient strong short-term load and longtime vibration. Metal structures with high stiffness can resist transient strong load, but the intrinsic damping of metal is extremely low and is not able to suppress vibration effectively. In order to enhance damping of structure with high stiffness, a type of multi-stable sandwich metal column is designed in this study. The finite element simulation shows that the stable-equilibriums of this column is converted in sequence with the cyclic load, and the corresponding stiffness change results in the hysteretic relation between force and displacement, which makes the metal column with high stiffness have efficient dissipation ability. Based on the elastic theory of sandwich structure and the stability theory of structure with variable boundaries, the stable-equilibriums threshold and stiffness change of this sandwich column are obtained, similar with the finite element simulation. The geometric parameter sensitivity of these load bearing and damping characteristics are studied by finite element simulation. This sandwich column was used to replace the diagonal brace of a jacket, and the finite element method was used to simulate the vibration of this structure under wave breaking loads. The calculation results showed that the multi-stable sandwich metal column guaranteed the high stiffness of jacket and enhanced the damping significantly. |
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| Keywords: | sandwich column|multi-stable|high stiffness|enhanced damping|the finite element |
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