【摘要】 鉴于大型旋转机械在瞬态响应过程中极易发生轴系恶性扭转破坏,结合某1 000MW超超临界汽轮发电机组,采用有限元分析(Finete Element Analysis,FEA)方法建立多转子轴系扭转响应和安全性分析计算模型。该模型利用甩负荷试验数据,模拟分析转速、转速变化率、变负荷率等因素对转子系统安全性的影响特点。比较了在不同因素作用下轴系中应力、扭角各自的分布差异和扭振响应状态,给出了最危险截面所在位置,并指出100%甩负荷过程在所有运行状态中最为危险,甩负荷发生后的98.6ms时刻轴系承受的扭转剪切应力值达到最大,是整个甩负荷过程最危险的时刻。该分析结果或为设计制造及运行维护提供一定的理论依据。更多还原

【Abstract】 Large rotating machines can suffer serious torsional damage during some load rejection process eg. Based on a1000 MW ultra-supercritical( USC) unit,this paper sets up a dynamic response & 3D safety analysis model of the USC unit rotor system by using finite elements analysis( FEA). Through the load rejection test data,this model can simulate and analyse the influence of speed,speed change rate,load and load change rate upon the safety of the rotor system. Depending on those analysis results,this paper compares the distribution difference of stress and torsional angle respectively on the status of torsional vibration response. It also gives the location of the most dangerous section,showing that 100% load rejection process was the most dangerous situation during all the running states,and around 98. 6 ms second after load rejection occurred was the most dangerous moment. These results provided a theoretical basis for optimal design,manufacturing and operation maintenance of rotor systems.更多还原