THE DYNAMIC CHARACTERISTICS OF TAPERED FLUID LINES WITH VISCOE-LASTIC PIPE WALLS (TRANSFER MATRIX AND FREQUENCY RESPONSE)

Authors

  • Mazeda Tahmeen Graduate School of Engineering, Gifu University, Japan
  • Hironao Yamada Department of Mechanical & Systems Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan
  • Takayoshi Muto Department of Mechanical & Systems Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan

Keywords:

fluid power systems, tapered fluid lines, transfer matrix equation, viscoelastic pipe wall, frequency response

Abstract

For convenience in investigating the dynamic responses of a liquid-filled tapered line with a viscoelastic pipe wall, a transfer matrix equation, relating pressure to volumetric flow, is derived. In this derivation, it was assumed that the rate of divergence (or convergence) of the line is comparatively small. The fluid line model employed in the analysis is one of an unsteady viscous flow; that is, the frequency-dependent effect of viscosity is taken into consideration. The visco-elastic pipe wall model is a modified version of the Voigt mechanical model, and it is distributed along the pipeline. The frequency response curves are calculated from the matrix, and the accuracy of the curves is evaluated by comparing them with the response curves obtained without assuming the small taper angle. The results verify that the transfer ma-trix is accurate enough for practical applications.

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Author Biographies

Mazeda Tahmeen, Graduate School of Engineering, Gifu University, Japan

Mazeda Tahmeen (Born October 09, 1968) received the Mas-ter of Engineering degree from the Gifu University Japan, in 1999. She is currently a Doctoral course student in graduate school of engineering, Gifu University.

Hironao Yamada, Department of Mechanical & Systems Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan

Hironao Yamada (Born October 02, 1962) received the Doc-tor of Engineering degree from the Nagoya University Japan, in 1991. From 1991 to 1994, he worked in Nagoya University. From 1992 to 1993, he was a Visiting Research Fellow at the Aachen Institute of Technology, Germany. He is currently an Associate Professor in the department of mechanical and systems engineering, Gifu University.

Takayoshi Muto, Department of Mechanical & Systems Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan

Takayoshi Muto (Born March 31, 1941) received the Doctor of Engineering degree from the Nagoya University, in 1972. From 1963 to 1972, he worked in the department of mechanical engineering, Nagoya University. From 1981 to 1982, he was a Visiting Research Fellow at the Aachen Institute of Technolo-gy, Germany. He is currently a Professor in the department of mechanical and systems engineering, Gifu University.

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Published

2001-11-01

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