Abstract
One of the key factors determining the hydraulic unit reliability and lifetime is the current technical state of the runner and, first and foremost, its lack of dangerous cracks. Dynamic load throughout the mode range affects the crack occurrence and development. Blade system crack formation process depends heavily on actual equipment operating modes. Yet, modern hydraulic unit diagnostics systems tend not to record crack formation on its early stages. As a result, routine maintenance often reveals long cracks which require significant financial and time resources to repair. Vibration-based diagnostics systems reveal cracks during operation ineffectively: calculations of the Francis (hydraulic) turbine’s runner prove that. High structural rigidity and specific eigenforms don’t permit correlating the blade dynamics to measured vibration parameters. Analytic approach based on calculating fatigue strength and fracture mechanics methods could solve the problem mentioned above.
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