基于模态参数损伤检测方法在海洋平台上的应用与改进

Application and Improvement of Crack Detection MethodsBased on Modal Parameters in Jacket Platform

将基于模态参数的损伤检测方法应用于海洋平台,并进行改进.提出了利用2次测量频率变化量的频率检测方法,在无未损伤模型参数的情况下也可以发现损伤的存在,并对损伤进行初步定位;同时提出利用不完全振型的相对变化,判断某些构件的断裂.讨论了平台重量变化对频率与振型的影响,以便能更准确地对平台进行损伤检测.

An improved crack inspection method based on modal parameters was presented for identifying a crack in a jacket platform. The improved method is used to predict the existence and the approximate location of the crack by using relative changes of frequencies and modal shapes of the damaged platform, in the absence of parameters of the intact structure. And the effects of the mass change on the frequencies and modal shapes were discussed so as to precisely evaluate the crack in the structure.