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Load Identification of Offshore Platform for Fatigue Life Estimation

机译：疲劳寿命估计的海上平台的负载识别

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摘要

The lifetime of an offshore platform is typically governed by accumulated fatigue damage. Thus, the load time history is an essential parameter for prediction of the lifetime of the structure and its components. Consequently, monitoring of structural loads is of special importance in relation to re-assessment of offshore platforms. Structural monitoring systems (SMS's) on offshore structures typically consist of a set of sensors such as strain gauges, accelerometers, wave radars and GPS's, however direct measuring of the actual loading is usually not feasible. One approach is to measure the loads indirectly by monitoring of the available dynamic responses of the structure. This work investigates the possibility for using an economically beneficial, model-based load estimation algorithm for indirect measuring of the loading forces acting on the offshore structure. The algorithm is based on the reduced order model of the structure and the discrete Kalman filter which recursively estimates unknown states of the system in real time. As a test-case, the algorithm is designed to estimate the equivalent total loading forces of the structure. The loads are estimated from noised displacement measurements of a single location on the topside of the offshore structure. The method is validated using simulated data for two wave loading cases: regular and irregular wave loadings.
机译：海上平台的寿命通常受到累积疲劳损伤的管辖。因此，负载时间历史是用于预测结构的寿命及其组件的基本参数。因此，与重新评估海上平台的关系，对结构负荷的监测具有特殊重要性。近海结构上的结构监测系统（SMS）通常由一组传感器组成，例如应变仪，加速度计，波雷达和GPS，但是实际负载的直接测量通常是不可行的。一种方法是通过监视结构的可用动态响应来间接测量负载。该工作调查了使用经济上有益的模型的负载估计算法，用于在近海结构上作用作用的装载力的间接测量。该算法基于结构的缩小阶模型和离散卡尔曼滤波器，其实时递归地估计系统的未知状态。作为测试用例，算法旨在估计结构的等效总装载力。从近海结构的顶部的单个位置的发音位移测量值估计负载。使用模拟数据进行验证，用于两个波浪装载情况：规则和不规则的波浪载荷。

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