自升式海洋平台风载非线性时域模拟

Simulation of Nonlinear Time Domain for Wind Load on Jack up Offshore Platform

由于环境条件限制,目前现场实测的脉动风速时程信号非常有限,现实的途径是利用计算机进行人工模拟。对于自升式海洋平台这种大跨度高耸结构体系,其随机风荷载的确定需要模拟三维的空间风场。文中考虑利用线性滤波器中的AR模型,采用最小AIC(AInformation Criterion)准则识别模型阶数,模拟具有随机性、时间性和空间相关性的风速时程。最后,对海洋平台空间的构件风载和风压作了数值计算。

Due to environmental conditions,the field measurement of pulse wind speed signal is very limited,and artificial simulation is a realistic way to compute the time domain of nonlinear wind loads.For jack-up platform with the large-span high-rise structure system,the determination of random wind load need to simulate the wind field of the three-dimensional space.In this paper,the AR model is employed to simulate the randomness,timeliness,and spatial correlation of wind speed combining with the A Information Criterion.Finally,wind load and wind pressure in the offshore platform space is calculated with the numerical method.