A novel hydrodynamic system, called torsional fluid film vibrator (TFFV) is proposed. This device is complementary to the Lanchester’s absorber and presents a classical response of a one-degree of freedom linear system with a periodical self-excitation. The fluid film thickness variation produces a variable viscous drag moment, which drives the elastically supported bush in a torsional oscillatory movement. The TFFV concept is connected with current research to improve the drilling technology of deep holes. The Navier-Stokes equations are solved on the particular geometry of this vibrator and the viscous drag moment is explicitly presented. The theoretical part is continued with the TFFV dynamic simulation and the analysis of the influence of the geometrical parameters on the amplitude of the viscous drag moment. Computed structural friction power and the amplitude of vibration agree reasonably well with the experimental measurements conducted on a TFFV test rig.
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July 2002
Technical Papers
Analysis of a Torsional Fluid Film Vibrator
C. V. Suciu,
C. V. Suciu
Department of Machine Elements and Tribology, “Politehnica” University of Bucharest, 313 Splaiul Independentei, 79590 Bucharest 6, Romania
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T. Iwatsubo,
T. Iwatsubo
MS-1 Laboratory, Mechanical Engineering Department, Kobe University 1-1-1 Rokkodai, Nada, 657-8501 Kobe, Japan
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M. D. Pascovici
M. D. Pascovici
Department of Machine Elements and Tribology, “Politehnica” University of Bucharest, 313 Splaiul Independentei, 79590 Bucharest 6, Romania
Search for other works by this author on:
C. V. Suciu
Department of Machine Elements and Tribology, “Politehnica” University of Bucharest, 313 Splaiul Independentei, 79590 Bucharest 6, Romania
T. Iwatsubo
MS-1 Laboratory, Mechanical Engineering Department, Kobe University 1-1-1 Rokkodai, Nada, 657-8501 Kobe, Japan
M. D. Pascovici
Department of Machine Elements and Tribology, “Politehnica” University of Bucharest, 313 Splaiul Independentei, 79590 Bucharest 6, Romania
Contributed by the Tribology Division for publication in the ASME JOURNAL OF TRIBOLOGY. Manuscript received by the Tribology Division January 4, 2001; revised manuscript received June 26, 2001. Associate Editor: A. A. Lubrecht.
J. Tribol. Jul 2002, 124(3): 480-485 (6 pages)
Published Online: May 31, 2002
Article history
Received:
January 4, 2001
Revised:
June 26, 2001
Online:
May 31, 2002
Citation
Suciu, C. V., Iwatsubo, T., and Pascovici, M. D. (May 31, 2002). "Analysis of a Torsional Fluid Film Vibrator ." ASME. J. Tribol. July 2002; 124(3): 480–485. https://doi.org/10.1115/1.1454101
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