REDUCTION OF QUASI-IMPULSIVE FORCES AND NOISE EMISSION IN THREE-SCREW PUMP ROTORS

Authors

  • Paolo Pennacchi Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 34, I-20158. Milano, Italy
  • Giovanni Mimmi Università degli studi di Pavia, Dipartimento di Meccanica Strutturale, Via Ferrata 1, I-27100 Pavia, Italy
  • Lucia Frosini Università degli studi di Pavia, Dipartimento di Meccanica Strutturale, Via Ferrata 1, I-27100 Pavia, Italy

Keywords:

three-screw pumps, noise reduction, rotor design, optimisation

Abstract

In this paper a theoretical study is presented about the possibility of reducing the quasi-impulsive load components, which act on the rotors of the three-screw pumps in the rotational axial direction. These forces can be related, on the basis of previous experimental and analytical studies by the same authors, to the noise emission of the pump. The analysis is carried out by the systematic variation of one of the design parameters of the rotors, i.e. the semi-amplitude of the threaded zone of the screws, by using the analytical tools previously set-up for the study of the dynamic loads on the standard rotors. Finally, it is shown that a suitable choice of this design parameter on one hand allows to cancel the quasi-impulsive load, on the other hand has a positive effect on the loads on the cross section.

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Author Biographies

Paolo Pennacchi, Politecnico di Milano, Dipartimento di Meccanica, Via La Masa 34, I-20158. Milano, Italy

Paolo Pennacchi Born on April 5th 1968, Milan (Italy). Degree, Ph.D. in Mechanics and Researcher at Politecnico di Milano, about 70 scientific publications on journals, congress and books. Participated to several MURST, ASI, CESI-ENEL, EDF, Brite EuRam “MODIAROT” research projects and to EU-India Economic Cross Cultural Pro-gram. His research fields are mainly ro-tordynamics, identification and diagnostics, kinematics, dynamics and design of mecha-nisms.

Giovanni Mimmi, Università degli studi di Pavia, Dipartimento di Meccanica Strutturale, Via Ferrata 1, I-27100 Pavia, Italy

Giovanni Mimmi Born on January 3rd 1947, Pavia (Italy). Full Professor of Applied Mechanics, more than 75 papers, on Journals, Congresses, books. Member of IFToMM Gearing & Transmissions TC, AAM, AIMETA, ASME, GIMC. Its researches has been supported by MURST, CNR, ASI, ENEL-CREL, Worthington, Pirelli Cavi, 3M Ferrania. Main research fields are kinemat-ics, dynamics and design of mechanisms, identification and diagnostics, bio-mechanics.

Lucia Frosini, Università degli studi di Pavia, Dipartimento di Meccanica Strutturale, Via Ferrata 1, I-27100 Pavia, Italy

Lucia Frosini Born on May 4th 1970 in Pavia (Italy). Degree, Ph.D. in Electrical Engineering and post-doc contract at Università di Pavia. Author of about 20 scientific publications on journals and congress proceedings. Participated to MURST (Italian Ministry for University and Scientific Research) and ASI (Italian Space Agency) research pro-jects. Her research fields are mainly identi-fication and diagnostics applied to electrical machines and flexible manipulators.

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Published

2001-11-01

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