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The Problem of Early Crack Detection in the Runner Blades of Hydraulic Units

  • RELIABILITY, STRENGTH, AND WEAR RESISTANCE OF MACHINES AND STRUCTURES
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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.

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Funding

This work was carried out within the framework of the Skolkovo Foundation project “Complex for Predictive Analytics of Equipment Technical Condition Parameters” and received funding from the Foundation for Assistance to Small Innovative Enterprises in Science and Technology (FASIE), grant agreement no. 3288GS1/55639, and the Skolkovo Innovation Сenter, grant agreement no. 40113/07002/0329-2020.

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  1. Center of Design and Technological Innovation, St. Petersburg, Russia

    E. V. Georgievskaia

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  1. E. V. Georgievskaia
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Correspondence to E. V. Georgievskaia.

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Translated by N. Bogacheva

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Georgievskaia, E.V. The Problem of Early Crack Detection in the Runner Blades of Hydraulic Units. J. Mach. Manuf. Reliab. 50, 216–221 (2021). https://doi.org/10.3103/S1052618821030043

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