论文部分内容阅读
以三峡大坝深孔弧形闸门原型试验为背景,提出采用泄洪激励作为环境激励对深孔弧门进行模态参数识别的两种方式,一是对进行泄洪工作的闸门进行工作模态分析;二是在其他闸门泄洪时对退出备用的闸门进行实验模态分析。针对前者,取用泄洪状态下弧门的位移响应,综合自然激励技术和特征系统实现算法,识别深孔弧形闸门的模态参数,同时指出,必须利用EMAC性能指标剔除虚假模态。对比有限元分析,结果表明,在泄洪产生的动力环境下,用该方法对深孔弧形闸门进行工作模态分析是可行的。
Taking the prototype test of the deep-hole arc gate of the Three Gorges Dam as a background, two ways of recognizing the modal parameters of the deep-hole arc gate using the flood discharge excitation as the environmental stimulus are proposed. The first is to analyze the operating modes of the sluice gate for flood discharge operation. The second is to exit the standby gate to carry on the experimental modal analysis when other gates flood. According to the former, taking the displacement response of arc gate under flood discharging condition and integrating the natural excitation technology and the characteristic system to realize the algorithm, the modal parameters of deep-hole arc gate are identified. At the same time, it is pointed out that the false modal must be eliminated by EMAC performance index. Compared with finite element analysis, the results show that it is feasible to use this method to analyze the working mode of deep-hole arc gate under the dynamic environment of flood discharge.