时域载荷识别法在海洋结构中的应用

动载荷识别的时域法是利用结构的模态参数建立结构系统在时域内的逆向模型,进而通过系统的动态响应识别输入动态载荷的过程。分析了采用时域方法对离散系统进行动载荷识别的方法,它是用正分析的方法来求解反问题。根据渤海某平台的测厚报告用ANSYS软件建立了该平台的有限元模型,采用理论分析和计算机仿真的方法相结合,将时域正演方法应用在海洋平台这种大型结构的载荷识别中,结果表明,只要实测信息准确,该方法在理论上具有较高的精度。

RESEARCH ON IDENTIFICATION OF DYNAMIC FORCES ON OFFSHORE PLATFORM

The identification of dynamic forces on time-domain is to build the reverse modal of the structure system through modal parameters of the structure and to identify the process of the loading through the response of the structure. It is analyzed the method that makes use of time-domain sequenced evolvement analysis way to identify the force of dispersed system,which handles the reversed problem with sequenced method.Using ANSYS,a finite element model is set up based on the thickness-measuring report of a platform in the Bohai Sea.By means of theoretical analysis and computer simulation of an offshore platform,the result shows that this method is more precise,so long as the measured information is accurate.