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1.
A procedure for identifying the dynamic parameter of offshore platform is presented. The present procedure consists of two
key features. First uses random decrement (RD) technology to extract free vibration signal in strong noise environment in
which it may not white noise. Second technology which called autoregressive moving average (ARMA) was used to model the data
treated by the random decrement method. In order to get rid of the color noise in the output signal response from the offshore
platform an imaginary system is added in RD system and make the course of extracting performed under the state of color input
by choosing the breakover condition and lead time. For eliminating multi-values of parameters identified, an updating moving
average method is used. The dynamic parameters of structure under arbitrary input are identified. Example of the method as
applied to a scale-model offshore platform was used to evaluate the technology of efficiency and the value of on-line.
Foundation items: the National Outstanding Youth Science Foundation of China (59625815); the Applied Development Foundation of National High
Technology
Biography: OU Jin-ping (1959-), Professor, Vice-President, Doctor 相似文献
2.
I.Deformation of the continuum can be described as the strain tensor.There are many forms ofthe strain tensors (in theory the number may be infinite).Common strain tensors arewhere (?)_(αβ)((?)~(αβ))and(?)_(αβ)((?)~(αβ)) are the metric tensors of the coordinate system dragged alongaround the deformation,respectively.The strain tensors ε_(αβ) and θ~(αβ) can be defined in the frame before the deformation andalso in the frame after the deformation,which are called the Lagrange strain tensor and the Euler 相似文献
3.
海洋平台离散模型振动控制研究 总被引:1,自引:0,他引:1
对近海平台离散结构模型在特征波浪载荷下,以平台上甲板最小位移为目标,比较了单个及多个调谐阻尼器(TMD)对系统各阶模态的抑振效果,结果表明,安装在第一模态质量上的调谐阻尼器对系统各阶模态振动的抑制作用最大;获得了海洋平台离散模型振动控制阻尼器的设计优化参数,为工程阻尼器设计提供了依据。 相似文献
4.
分析和研究了导管架式海洋平台结构采用阻尼隔振技术的基本原理,建立了阻尼隔振体系简化计算模型,推导了两自由度简化模型,采用强行解耦方法计算结构第一振型阻尼比的计算公式,研究了隔振层参数与结构阻尼比的关系以及它们对结构整件和隔振层层间相对位转的控制效果,进行了在波浪力和地震工况下的数值模拟,结果表明,阻尼隔振方案是导管架式海洋平台的一种有效减振措施,当阻尼隔振层刚度较大时,可以有效控制平台结构的振动。 相似文献