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汽轮发电机组轴承座动力特性对转子 -轴承系统振动有比较大的影响。但迄今为止 ,除了冲击试验外 ,还没有找到轴承座动力特性实测的好方法。文中提出利用转子 -轴承系统结构数据和机组启停过程中不平衡响应数据重构出轴承座频响函数 ,利用最小二乘原理获得轴承座动力特性。新模型无需已知油膜轴承动力特性系数和转子上原始不平衡分布情况 ,识别结果的准确性仅仅与转子系统模化精度有关。该方法在现场很容易实现 ,可以对运行机组进行实测 ,具有非常强的实用性。文中最后结合国产 2 0 0MW汽轮发电机组实例进行了仿真和试验分析 ,计算结果表明该方法是可行的。
The dynamic characteristics of the steam turbine generator housings have a great influence on the vibration of the rotor-bearing system. But so far, in addition to the impact test, but also failed to find a good way to measure the dynamic characteristics of the bearing seat. In this paper, the frequency response function of the bearing seat is reconstructed by using the rotor-bearing system structure data and the unbalance response data during the start-stop process of the unit. The dynamic characteristics of the bearing seat are obtained by using the principle of least squares. The new model does not need to know the dynamic characteristic coefficient of the oil film bearing and the original imbalance distribution on the rotor. The accuracy of the recognition result is only related to the precision of the rotor system. The method is very easy to implement in the field and can be measured on the running unit. It has very strong practicability. In the end, the simulation and experimental analysis of the domestic 200MW turbo-generator are carried out. The calculation results show that this method is feasible.