Rotating machines that include geared shaft-trains can be affected by a dynamic behavior that is influenced by coupling effects between lateral and torsional vibrations. These latter vibrations are rarely measured by means of permanent probes in industrial machines; therefore, these phenomena can be often pointed out only by detecting abnormal harmonic components in the frequency spectrum of the lateral vibrations measured during common monitoring activities. Then, the diagnosis of the occurrence of coupling effects between torsional and lateral vibrations can be supported by the results provided by model-based techniques. In this paper, the results of the analysis of the dynamic behavior of a small power unit that was affected by abnormal lateral vibrations caused by the excitation of torsional normal modes of the geared shaft-train are shown and discussed.
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January 2011
Research Papers
Torsional Vibrations Caused by Geared Coupling in a Shaft Train Driven by a Steam Turbine
Paolo Pennacchi,
Paolo Pennacchi
Mem. ASME
Department of Mechanical Engineering,
e-mail: paolo.pennacchi@polimi.it
Politecnico di Milano
, Via La Masa 1, I-20156 Milan, Italy
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Andrea Vania,
Andrea Vania
Department of Mechanical Engineering,
Politecnico di Milano
, Via La Masa 1, I-20156 Milan, Italy
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Franco Frattaroli
Franco Frattaroli
Service Engineering,
Franco Tosi Meccanica S.p.A.
, Piazza Monumento 12, I-20025 Legnano (MI), Italy
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Paolo Pennacchi
Mem. ASME
Department of Mechanical Engineering,
Politecnico di Milano
, Via La Masa 1, I-20156 Milan, Italye-mail: paolo.pennacchi@polimi.it
Andrea Vania
Department of Mechanical Engineering,
Politecnico di Milano
, Via La Masa 1, I-20156 Milan, Italy
Franco Frattaroli
Service Engineering,
Franco Tosi Meccanica S.p.A.
, Piazza Monumento 12, I-20025 Legnano (MI), ItalyJ. Eng. Gas Turbines Power. Jan 2011, 133(1): 012501 (8 pages)
Published Online: September 27, 2010
Article history
Received:
April 9, 2010
Revised:
April 23, 2010
Online:
September 27, 2010
Published:
September 27, 2010
Citation
Pennacchi, P., Vania, A., and Frattaroli, F. (September 27, 2010). "Torsional Vibrations Caused by Geared Coupling in a Shaft Train Driven by a Steam Turbine." ASME. J. Eng. Gas Turbines Power. January 2011; 133(1): 012501. https://doi.org/10.1115/1.4001830
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