300Mvar空冷隐极调相机转子疲劳强度分析

300Mvar空冷隐极调相机转子跨距长、重量大,在自身重力作用下转子挠度和弯曲应力已经达到疲劳设计极限,因此设计出安全可靠的转子结构具有很大难度。本文建立了300Mvar空冷隐极调相机转子疲劳损耗的三维有限元分析模型,分别对机组额定稳态运行工况及起停机过程的瞬态工况进行仿真计算,分析两种工况下转子的动态应力,并进一步对起停机工况的动态应力进行雨流法分析。最后,根据德国机械工程师委员会的FKM疲劳计算导则,对调相机转子进行寿命评估,保证了300Mvar空冷隐极调相机转子的安全可靠性。

Fatigue Strength Analysis of Rotation Shaft for 300Mvar Air-cooled Cylindrical Synchronous Condenser

The rotor span of the 300Mvar air-cooled cylindrical synchronous condenser is long and heavy,its rotation shaft deformation and bending stress has already reached the fatigue design limitation under its own gravity.Therefore,it is very difficult to design a safe and reliable rotor structure.In this paper,a three-dimensional finite element analysis model of the rotor fatigue loss of a 300Mvar air-cooled cylindrical synchronous condenser was established.The rated steady-state operating condition and the transient operating condition of the start-stop process of the unit were simulated and calculated respectively,and the dynamic stress of the rotor under the two operating conditions was analyzed.The rain flow method was used to analyze the dynamic stress in the start-stop condition.Finally,according to the FKM fatigue calculation guidelines of the German Council of Mechanical Engineers,the life of the adjustable rotor was evaluated to ensure the safety and reliability of the 300Mvar air-cooled cylindrical synchronous condenser.