RESEARCH ON PULSATION ATTENUATION CHARACTERISTICS OF SILENCERS IN PRACTICAL FLUID POWER SYSTEMS

Authors

  • Eiichi Kojima Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan
  • Takayoshi Ichiyanagi Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

Keywords:

fluid-borne noise, pressure pulsation, hydraulic silencer, side-branch resonator, insertion loss, noise reduction

Abstract

The pulsation attenuation characteristics of silencers in practical fluid power systems are investigated theoretically and experimentally in terms of the insertion loss characteristics, taking the every key circuit-design factors including the pump and the load into consideration, so as to develop an useful CAE design tool for reducing the system audible noise level through the use of a fluid-borne vibration control technique. A new expression for the insertion loss characteristics is also proposed which makes the physical elucidation of its complex characteristics easy and helps to search for the optimum insertion location efficiently. Particular attention has been paid to both the theoretical determination of the optimum insertion location and the op-timum design of silencer for the specified hydraulic circuit. The simulated results of the insertion loss characteristics agree with the experimental results with sufficient accuracy for practical use up to around 5th harmonic of the pump-induced harmonic pressure pulsation. Further, it is shown that our developed new silencer called a “variable-resonance mode type side-branch resonator” has proven to be very successful for reduction of audible noise also in application to a real hydraulic excavator.

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Author Biographies

Eiichi Kojima, Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

KOJIMA EIICHI Born 14th May 1937. Professor of Kanagawa University in Japan. He completed the postgraduate course of University of Tokyo and received his Dr. Eng. degree in 1969. His research interests include noise- vibration-harshness of hy-draulic components and systems, tracking control of electro-hydraulic servo system and simulations. He has won prizes of best paper of Transaction JHPS in the 1997 and 1999 fiscal year two times even in the last three years. Since 1996 he has acted as a Japanese expert of the ISO TC131/SC8/ WG1.

Takayoshi Ichiyanagi, Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

ICHIYANAGI TAKAYOSHI Born 28th Sep 1969. Graduate student of Kanagawa University. His research has centered around develop-ment and optimum design of hydraulic silencer for construction machine and auto-mobile power steering systems..

References

Bais, R. J. and Toet, G. 1992. How to define the prop-erties of a hydraulic silencer in a hydraulic system. Fifth Bath International Fluid Power Workshop, University of Bath, UK.

Edge, K. A. and Johnston, D. N. 1990. The “second-ary source” method for the measurement of pressure ripple characteristics, Part 1 : description of method, Part 2 : experimental results. Proc. I Mech E, Vol.204, pp.33-40, pp.41-46.

Gassman, M. P. 1987. Noise and Pressure Control with Hydraulic Attenuators. SAE Technical Paper, Series 871682.

Henderson, R. 1980. Quieter Fluid Power Handbook. BHRA. ISBN No.0-906085-49-7.

Kojima, E. 1992. A new method for the experimental determination of pump fluid-borne noise Character-istics. Fifth Bath International Fluid Power Work-shop, University of Bath, UK.

Kojima, E., Kimura, Y., Terasawa, T. and Takeshita, S. 1998. Development Research of Res-onance-Mode Type of Side-Branch Resonators. Trans. JSME (in Japanese), Ser. C, Vol.64, No.621, pp.1596-1603.

Kojima, E. and Ichiyanagi, T. 1998. Development research of new types of multiple volume resona-tors. First Bath Workshop on Power Transmission and Motion Control, University of Bath, UK.

Kojima, E. and Edge, K. E. 1994. Experimental de-termination 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., Ichiyanagi, T. and Edge K. A. 1996. Per-formance of flexible hoses with spiral wound tubu-lar Inserts for reduction of fluid-borne pressure pul-sations in automotive hydraulic power steering sys-tems. Ninth Bath International Fluid Power Work-shop, University of Bath, UK.

Powell, M. J. 1964. An Efficient Method for Finding the Minimum of a Function of Several Variables without Calculating Derivatives. Computer, Vol.7, 155-162.

Strunk, R. D. 1991. Silencer for Hydraulic Piston Pump Pressure Pulsations. SAE Technical Paper, Series 911759.

Washio, S., Konishi, T., Ueta, T. and Ookuma, S. 1988. Research on Wave Phenomena in Hydraulic (16th Report, Pulsation Reduction by Branch Pipe Filters). Trans. JSME (in Japanese), Ser.B, Vol.54, No.504, pp.1953-1961.

Weddfelt, K. 1992. On Modelling, Simulation and Measurements of Fluid Power Pumps and Pipe-lines. Linköping Studies in Science and Technolo-gy. Dissertation. No.268.

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Published

2000-10-01

How to Cite

Kojima, E., & Ichiyanagi, T. (2000). RESEARCH ON PULSATION ATTENUATION CHARACTERISTICS OF SILENCERS IN PRACTICAL FLUID POWER SYSTEMS. International Journal of Fluid Power, 1(2), 29–38. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/649

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Original Article