DEVELOPMENT OF ACCURATE AND PRACTICAL SIMULATION TECHNIQUE BASED ON THE MODAL APPROXIMATIONS FOR FLUID TRANSIENTS IN COMPOUND FLUID-LINE SYSTEMS

1ST REPORT: ESTABLISHMENT OF FUNDAMENTAL CALCULATION ALGORITHM AND BASIC CONSID-ERATIONS FOR VERIFICATION OF ITS AVAILABILITY

Authors

  • Eiichi Kojima Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan
  • Masaaki Shinada Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan
  • Jinghong Yu Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

Keywords:

fluid transients, water hammer, modal approximation, compound fluid-line system

Abstract

New simulation technique called the “system modal approximation” method for fluid transients in compound flu-id-line systems is developed and presented. Unlike existing approaches based on the modal approximation of the in-put/output causality relationship of individual line element, this new method is based on the modal approximation of the frequency transfer function itself of the output (wanted variable) to the input (source) considering the dynamic charac-teristics of total system. This simulation technique also has the feature that only the numerical data of the frequency response of transfer matrix parameters of individual line element, which may be obtained from either theoretical model or experimental measurements, is needed and that the wanted output variable alone can be calculated selectively in the time domain by a simple algebraic expression in the form of recurrence formula. For complex fluid-line systems, the ad-vantages of this technique over other existing modal approximation-based methods in accuracy, applicability, flexibility, computation time, etc. are discussed with experimental comparisons.

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Author Biographies

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

Eiichi Kojima is 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 hydraulic com-ponents and systems, optimum design, and simulations. He has won prizes of best paper of Transaction JHPS in the 1997 and 1999 fiscal year. Since 1996 he has acted as a Japanese expert of the ISO TC131/SC8/WG1.

Masaaki Shinada, Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

Masaaki Shinada is a research associate of Kanagawa University in Japan. He received Doctor of Engineering degree from Tokyo Institute of Technology in 1996. His research interests include fluid transient phenomena in fluid power pipeline systems and pressure pulsations in hydraulic components and systems.

Jinghong Yu, Department of Mechanical Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa-ku, Yokohama, Japan

Jinghong Yu Currently is a Senior Engineer, Vehicle Re-search, Honda R&D Americas, Inc. He re-ceived his Ph.D. in mechanical engineering in 1991 and has authored 20+ research papers, with 11+ years of research experience in the field of noise, vibrations and reliability of fluid and mechanical systems at different organiza-tions including Honda, Kanagawa University, Tokyo Institute of Technology, Shanghai Jiao Tong University.

References

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Published

2002-08-01

How to Cite

Kojima, E., Shinada, M., & Yu, J. (2002). DEVELOPMENT OF ACCURATE AND PRACTICAL SIMULATION TECHNIQUE BASED ON THE MODAL APPROXIMATIONS FOR FLUID TRANSIENTS IN COMPOUND FLUID-LINE SYSTEMS: 1ST REPORT: ESTABLISHMENT OF FUNDAMENTAL CALCULATION ALGORITHM AND BASIC CONSID-ERATIONS FOR VERIFICATION OF ITS AVAILABILITY. International Journal of Fluid Power, 3(2), 5–15. Retrieved from https://journals.riverpublishers.com/index.php/IJFP/article/view/621

Issue

2002: Vol 03 Iss 2

Section

Original Article