某钢厂带钢连续热镀锌线上的冷却塔高达60余米,结构复杂且其上设备繁多,其动特性对工艺段带钢抖动的贡献不可忽视。为了更好地研究冷却塔的动力学特性及其可能带来的对带钢抖动的影响,本文以相似理论中的π定理为基础,对冷却塔进行模型相似设计,并用LMS模态测试系统测试模型塔动态特性,结果发现,模型和原型的动力学特性基本相似,这为进一步在实验室建立抖动试验装置、更深入地研究热镀锌工艺段的带钢抖动问题提供了可靠的塔模型。

The cooling tower of a continuous hot dip galvanizing line is more than 60 meters high, with complex structure and with various equipments installed in it. The dynamic characteristics of the cooling tower have important effects on the strip vibration of the process section. In order to better reveal the effects of dynamic characteristics of the cooling tower on the strip vibration, this paper designs a model to simulate the cooling tower based on the theorem of the similarity theory. The LMS modal testing system is used to test the dynamic characteristics of the model and the prototype, and it is found that their dynamic characteristics are basically similar to each other. So a reliable tower model is obtained for a vibration testing device of the process section to investigate the strip vibration.