首页> 外文学位 >PEAK RESPONSE OF OFFSHORE STRUCTURES TO WAVE AND CURRENT FORCES (MARINE, RANDOM, UPCROSSING RATES, DESCRIPTORS, PROBABLISTIC WAVES).
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PEAK RESPONSE OF OFFSHORE STRUCTURES TO WAVE AND CURRENT FORCES (MARINE, RANDOM, UPCROSSING RATES, DESCRIPTORS, PROBABLISTIC WAVES).

机译:海洋结构对波浪和当前力(海洋,随机,超上行速率,描述子,概率波)的峰值响应。

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摘要

The differential equations governing the motion of an offshore structure subjected to Morison wave loads are nonlinear. The solution of these equations is generally based on approximate methods, such as statistical linearization. This work develops methods for estimating the quasi-static and dynamic peak responses of offshore structures subjected to wave forces.; Response descriptors such as mean upcrossing rates and average peak responses are obtained for the quasi-static response by point-crossing formula and vector crossing analysis. The peak descriptors for the dynamic response are obtained by Monte-Carlo simulation and time discretization methods. The Monte-Carlo simulation developed here uses the FFT technique and is computationally efficient. It can account for the spatial correlation of the wave forces. In the method of time discretization, the wave load is discretized in time and represented as an independent sequence. The marginal probability distribution function of the response to this sequence can be obtained by an FFT inversion of its characteristic function. Mean upcrossing rates of the response are obtained approximately if the response is represented by a translation process. Translation processes can be obtained from Gaussian processes by memoryless transformations.; The methods are applied to the analysis of two offshore platforms; a Tension Leg Platform and a Tower Platform. Approximate methods of analysis such as the statistical linearization are found to be inadequate in prediction of peak response. On the other hand, approximations based on the time discretization provide reliable and accurate results.
机译:控制海上结构在莫里森波荷载下的运动的微分方程是非线性的。这些方程式的解通常基于近似方法,例如统计线性化。这项工作开发了估算在波浪力作用下的海上结构的准静态和动态峰值响应的方法。通过点交叉公式和向量交叉分析,获得了准静态响应的响应描述符,例如平均上交速率和平均峰响应。动态响应的峰值描述符通过蒙特卡洛模拟和时间离散化方法获得。这里开发的蒙特卡洛仿真使用FFT技术,并且计算效率高。它可以解释波浪力的空间相关性。在时间离散化方法中,波负载在时间上离散化,并表示为一个独立的序列。该序列响应的边际概率分布函数可以通过对其特征函数进行FFT反演来获得。如果响应由翻译过程表示,则大约可获得响应的平均上移率。可以通过无记忆转换从高斯过程获得翻译过程。该方法适用于两个海上平台的分析。张力腿平台和塔式平台。发现诸如统计线性化之类的近似分析方法不足以预测峰响应。另一方面,基于时间离散的近似值提供了可靠且准确的结果。

著录项

  • 作者

    ALIBE, BUNU.;

  • 作者单位

    Cornell University.;

  • 授予单位 Cornell University.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 1986
  • 页码 155 p.
  • 总页数 155
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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