Critical Vibrations for Turbine Elements

Abstract:

The condition of a dynamic machine (equipment) can be estimated at the current level, by measuring the vibration levels. Each component of a machine produces a vibration with one or more specific frequencies. Knowing the components of the spectrum of frequencies of the global vibration, it is possible to determine which of the components of the moving assembly the problem occurred. Thus, by measuring the vibration, a multitude of defects can be detected, for a wide variety of dynamic machines. Unlike other diagnostic devices, spectrum analyzers have the widest use in the evaluation of vibrations and specific stresses on fixed structures or on rotor blades. Other experiments evaluate the natural frequencies of the rotors, the influence of the cavity of the rotor-stator interaction. Model or prototype studies establish the influence of pressure pulsations at partial load for radial axial turbines [5]. In the work, the vibrational behavior of a Kaplan hydraulic turbine with 6 rotor blades of high power (P=200MW, Dn=9.5m), was analyzed when mechanical failures (wear) appeared after several years of operation, the graphs being taken from the diagnostic system of the studied hydrogen generator.

• Periodical: Advances in Science and Technology (Volume 178)
• Pages: 55-62
• DOI: https://doi.org/10.4028/p-B9sDZ1
• Online since: June 2026
• Authors: Traian Țunescu, Iulian Ştefan, Bebe Adrian Olei, Ionel Dănuț Savu*
• Keywords: Defects, FFT Spectra, Monitoring, Pitting Corrosion, Runner Blade, Sustainability, Vibrations

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