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Life Damage of Shaft and Spider in Hydraulic Generator Unit Based on Vibration Signal

机译：基于振动信号的水轮发电机组轴和星形轮寿命损伤

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摘要

As we know, more and more systems of condition monitoring for hydro-turbine generator units have been put into practice all over the world. Among all the systems, the functions are often limited on the aspects of stability tracking, signal capturing, data saving, signal analysis and fault diagnosis, etc., the most important problems that operators on field concerned directly, for example, the life damage of key components, are not solved well up to now. In this paper, the life damage has been researched for two key components, the turbine shaft and spider, in a hydraulic generator unit. Firstly, the outer exciting loads and normal stresses are analyzed. Then how to determine the critical plane in the turbine shaft caused by transverse vibration is described, and several different calculating cases are given. Based on deeply processing of vibration signals, a concept of 3-dimensional database is proposed, in which the relationship between normal stress in the critical plane and vibration signals, including amplitude and frequency components, at measurable locations is determined. Finally, a programmable algorithm is proposed to calculate the life damage of a turbine shaft. And by simplifying, an application of life damage calculation for the spider is given in the end.
机译：众所周知，全世界越来越多的水轮发电机组状态监测系统投入使用。在所有系统中，功能通常仅限于稳定性跟踪，信号捕获，数据保存，信号分析和故障诊断等方面，这是操作人员直接在现场关注的最重要问题，例如生命周期的损失。关键组件，到目前为止还没有很好地解决。在本文中，对水轮发电机组中两个关键组件（涡轮轴和星形轮）的寿命损失进行了研究。首先，分析了外部激励载荷和法向应力。然后描述了如何确定由横向振动引起的涡轮轴临界面，并给出了几种不同的计算情况。在对振动信号进行深度处理的基础上，提出了三维数据库的概念，确定了临界平面上的法向应力与振动信号在可测量位置之间的关系，包括振幅和频率分量。最后，提出了一种可编程算法来计算涡轮轴的寿命损失。通过简化，最后给出了蜘蛛生命损失计算的应用。

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