Abstract

The initiation and growth of fatigue cracks in the runner blades of hydraulic units is one of the major causes that limit their service life. Practice shows that the current diagnostic systems for hydraulic units do not permit timely identification of cracks in the operating equipment. The data from the numerical experiment demonstrate that high stiffness and the existence of particular eigenmodes in the structure do not enable the dynamic stresses in the blades responsible for crack initiation to be linked to the parameters controlled by the diagnostic system. Analytical approaches based on evaluation of the fatigue strength and fracture mechanics can help solve this problem.

中文翻译：

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液压装置转轮叶片早期裂纹检测问题

摘要

液压装置转轮叶片疲劳裂纹的萌生和发展是限制其使用寿命的主要原因之一。实践表明，当前的液压单元诊断系统不能及时识别操作设备中的裂纹。数值实验的数据表明，结构中的高刚度和特定本征模式的存在不能使叶片中导致裂纹萌生的动态应力与诊断系统控制的参数相关联。基于疲劳强度和断裂力学评估的分析方法可以帮助解决这个问题。