平台振动控制中粘弹性阻尼器及其位置优化
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摘要
针对结构复杂的多自由度海洋平台模型 ,设计了粘弹性阻尼器 ,研究了基于粘弹性阻尼器的海洋平台振动控制及阻尼器的位置优化 ,考虑到粘弹性阻尼器的减振原理 ,采用层间相对位移的均方差作为阻尼器的定位准则 ,使海洋平台受控点的位移响应降低到允许的范围内。针对一个实际的 7自由度的海洋平台计算模型 ,在随机波浪载荷作用下进行了平台振动响应分析及阻尼器的位置优化设计。结果表明 ,大跨安装阻尼器后平台位移响应谱幅度大大地降低。
This paper is to investigate the vibration control of an actual offshore platform modeled as a seven-degree-of-freedom system by using a viscoelastic damper. Place the damper in position is quite important for the vibration reduction of the platform, otherwise it is invalid or even harmful. Considering the principle of energy dissipation of viscoelastic material, the root mean square value of the relative displacement between layers is taken as a damper positioning criterion for the displacement response at the controlled points of the platform within the allowable range. The result shows that, with the optimal damper positioning, the displacement of the deck motion under random wave excitations can be suppressed effectively.
This paper is to investigate the vibration control of an actual offshore platform modeled as a seven-degree-of-freedom system by using a viscoelastic damper. Place the damper in position is quite important for the vibration reduction of the platform, otherwise it is invalid or even harmful. Considering the principle of energy dissipation of viscoelastic material, the root mean square value of the relative displacement between layers is taken as a damper positioning criterion for the displacement response at the controlled points of the platform within the allowable range. The result shows that, with the optimal damper positioning, the displacement of the deck motion under random wave excitations can be suppressed effectively.
引文
1 黄星红,郑建国,宋福堂.阻尼舱减振模型实验研究.振动、测试与诊断,1999,19(1):58～62
2 魏文晖,瞿伟廉,陈朝晖.粘弹性阻尼器对建筑结构非线性地震反应的控制.地震工程与工程振动,1999,19(4):95～101
3 欧进萍,肖仪清,段忠东,等.设置粘弹性耗能器的JZ20-2MU Q平台结构冰振控制.海洋工程,2001,18(3):9～14
4 AntoniadesC,ChristofidesP D.Integrating nonlinearoutput feedback control and optim al actuator/ sensorplacem ent for transport- reaction processes.Chem icalEngineeringScience,2001,(56):4517～4535
5 IzuruTakewaki.Optimal damper positioning in beamsfor minim um dynamic compliance.Comput.MethodsAppl.Mech.Engrg,1998,(156):269～281
6 刘学利.粘弹性耗能器控制下电视塔风振反应实用分析法.特种结构,2000,17(3):17～22
2 魏文晖,瞿伟廉,陈朝晖.粘弹性阻尼器对建筑结构非线性地震反应的控制.地震工程与工程振动,1999,19(4):95～101
3 欧进萍,肖仪清,段忠东,等.设置粘弹性耗能器的JZ20-2MU Q平台结构冰振控制.海洋工程,2001,18(3):9～14
4 AntoniadesC,ChristofidesP D.Integrating nonlinearoutput feedback control and optim al actuator/ sensorplacem ent for transport- reaction processes.Chem icalEngineeringScience,2001,(56):4517～4535
5 IzuruTakewaki.Optimal damper positioning in beamsfor minim um dynamic compliance.Comput.MethodsAppl.Mech.Engrg,1998,(156):269～281
6 刘学利.粘弹性耗能器控制下电视塔风振反应实用分析法.特种结构,2000,17(3):17～22
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