基于替代模型的岸桥随机有限元模型修正

研究了考虑参数随机不确定性的岸桥有限元模型修正问题。首先,假设岸桥的待修正参数和模态参数都服从正态分布,将不确定性模型修正问题转化为均值和标准差的修正问题;其次,以某岸桥为研究对象,进行风振响应实测,利用随机子空间法得到岸桥前4阶实测模态参数;最后建立岸桥的有限元模型,基于Kriging替代模型及多目标遗传算法对岸桥结构进行有限元模型修正。结果表明,考虑参数不确定性的随机有限元模型修正方法能有效修正岸桥结构参数的均值和标准差。

Updating of stochastic finite element model of a quayside container crane based on meta-model

The updating of a quayside container crane(QCC)finite element model considering stochastic uncertainty of parameters was studied.Firstly,assuming that parameters to be updated and modal parameters of a QCC obey normal distribution,an updating problem of a model with uncertainty was converted into updating problems of mean and standard deviation.Then,a certain QCC was taken as the study object,its wind induced vibration responses were measured,and its first four orders measured modal parameters were obtained using the stochastic subspace method.Finally,the finite element model of this QCC was established,and the model was updated based on Kriging meta-model and multi-objective genetic algorithm.The results showed that the proposed stochastic finite element model updating method considering parametric uncertainty can be used to effectively update parameters’mean and standard deviation of a QCC structure.