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Dampers to Suppress Vibrations in Hydro Turbine-Generator Shaft Due to Subsynchronous Resonance

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Abstract

There are numerous applications to evaluate the damage caused by subsynchronous resonance (SSR) to a turbine-generator shaft. Despite multiple applications, there are relatively few studies on shaft misalignment in the literature. In this paper, stresses in the existing turbine-generator shaft due to subsynchronous resonance were studied using finite element analysis (FEA). The 3D finite element model reveals that the most stressed part of the shaft is near the generator terminal. A new nonlinear damping scheme is modeled to reflect the torsional interaction and to suppress the mechanical vibration caused by subsynchronous resonance (SSR). Stresses developed due to the addition of capacitors in the system at high rotational speeds and deformation of the shaft during various modes of oscillations were evaluated. Experimental investigations are carried out in reaction turbine connected to a 3 kVA generator. Simulation is carried out for the experimental setup using ANSYS. According to the simulation results, the damper installed near the generator terminal provides satisfactory damping performance and the subsynchronous oscillations are suppressed.

Keywords

  • Damper
  • Modal analysis
  • Rotor dynamics
  • Subsynchronous resonance
  • Turbo-generator shaft

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Acknowledgements

The authors are grateful to Christ (Deemed to be) University—Department of EEE, Faculty of engineering and Department of Mechanical engineering for providing the laboratory facilities and Department of EEE, Ghousia College of Engineering Ramanagaram (affiliated to Visvesvaraya Technological University), Karnataka, India.

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Correspondence to Pounraj Manikandan .

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Manikandan, P., Khan, F.A. (2021). Dampers to Suppress Vibrations in Hydro Turbine-Generator Shaft Due to Subsynchronous Resonance. In: Rushi Kumar, B., Sivaraj, R., Prakash, J. (eds) Advances in Fluid Dynamics. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-4308-1_36

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  • DOI: https://doi.org/10.1007/978-981-15-4308-1_36

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