DEVELOPMENT OF A COMPACT AND TUNEABLE VIBRATION COMPENSATOR FOR HYDRAULIC SYSTEMS
Keywords:
flow pulsations, pressure pulsations, vibration compensation, hydraulic spring, noise attenuation, compactnessAbstract
This publication is about vibration compensators for the attenuation of fluid flow pulsations in hydraulic systems. After a problem definition and an overview of conventional devices, a compact and adjustable mass-spring resonator featuring a hydraulic spring will be presented. The main advantages of this design are: simple and compact design, excellent noise attenuation characteristics, suitability for all pressure levels through mean pressure compensation and the possibility to alter the resonance frequency of the device in both a semi-active and active manner.
Besides the description of the working principle, the discussion of some phenomena occurring at high frequencies, the treatment of some design aspects, such as the optimisation of the sealing gap geometry, dimensioning etc. and a section devoted to compactness of vibration compensators, experimental results will be presented which prove the use-fulness of the concept.
Downloads
References
Backé, W. 1994. Grundlagen der Ölhydraulik (in German). Lecture notes, RWTH Aachen, Germany.
Beranek, L. and Vér, I. 1992. Noise and Vibration control Engineering. John Wiley, New York.
Dodson, J., Dowling, D. and Grosh, K. 1998. Experi-mental investigation of quarter wavelength silencers in large-scale hydraulic systems. Noise control En-gineering Journal, 46(1), pp. 15-22.
Garstenauer, M. Grammer, S. and Scheidl, R. 1996. The resonance converter – a novel method for hy-draulic fluid power control. Proceedings of Mecha-tronics ’96, University of Skövde, Sweden.
Hunt, J. 1979. Dynamic vibration absorbers. Mechan-ical Engineering Publications, London, UK.
Ivantysyn, J. and Ivantysynova, M. 2000. Hydrostatic Pumps and Motors – Principles, Designs, Perfor-mance, Modelling, Analysis, Control and Testing. Academia Books International, New Delhi.
Ingard, U. 1953. On the theory and design of acoustic resonators. Journal of the Acoustical Society of America, 25(6).
Ingard, U. 1988. Fundamentals of waves and oscilla-tions. Cambridge University Press.
Kojima, E. 1992. A new method for the experimental determination of pump fluid borne noise. Fifth Bath International Fluid Power Workshop, University of Bath, UK.
Kojima, E. and Edge, K.A. 1994. Experimental deter-mination of hydraulic silencer transfer matrices and assessment of the method for use as a standard test procedure. Seventh Bath International Fluid Power Workshop, University of Bath, UK.
Kojima, E. and Ichiyanagi, T. 2000. Research on pulsation attenuation characteristics of silencers in practical fluid power systems. International Journal of Fluid Power, Vol. 1, No. 2.
Mikota, J. 2001. Device for damping pressure pulses in a hydraulic system. International patent applica-tion, No.WO02090815.
Mikota, J. and Manhartsgruber, B. 2001. Transient response dynamics of dynamic vibration compensa-tors for the attenuation of fluid flow pulsations in hydraulic systems. Power Transmission and Motion control (PTMC ’01), University of Bath, UK.
Mikota, J. 2002. Contributions to the development of compact and tuneable vibration compensators for hydraulic systems. PhD thesis, Johannes Kepler University Linz, Austria.
Reiter, H. 2002. Simulation, Konstruktion und Vermessung eines neuartigen Schwingungstilgers für die Ölhydraulik (in German). Master thesis, Jo-hannes Kepler University Linz, Austria.Scheidl, R. and Riha, G. 1999. Energy efficient switching control by a hydraulic resonance convert-er. Power Transmission and Motion control (PTMC ’99), University of Bath, UK.
