Volume 36, Issue 3 (May 2008)

    Dynamic Characteristics of Different Aspect Ratios of Small Hydraulic Orifices Using a Pressure Square Wave Generator

    (Received 26 January 2007; accepted 12 December 2007)

    Published Online: 2008

    CODEN: JTEOAD

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    Abstract

    This study examines the dynamic characteristics of different aspect ratios (length/diameter, L/D) of small hydraulic orifices. A homemade pressure square wave generator (PSWG) was employed to excite inlet pressure square waves The responses of time-domain and frequency-domain were measured by piezoelectric pressure sensors and a Spectrum Analyzer. Experimental conditions: At a pressure of 2 MPa, frequency was adjusted by the frequency converter to 200 Hz, orifice diameters range from 0.5 to 2.0 mm and lengths are from 0.5 to 3 mm (aspect ratios from 0.25 to 6). In the wave form of the time-domain response, a square waveform at the inlet of the orifice becomes a triangular waveform after the hydraulic fluid flows through the orifice. The pressure-drop via the orifice results in a delay of pressure increase and decrease. Results show a considerable pressure decay of over 90 % on the large aspect ratio of small orifices. For characteristics of dynamic control, it is necessary to improve hydraulic technology to reach the high precision field.


    Author Information:

    Wu, Y. C.
    Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei,

    Fan, P. S.
    Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei,

    Tsung, T. T.
    Institute of Mechanical and Electrical Engineering, National Taipei University of Technology, Taipei,


    Stock #: JTE101030

    ISSN: 0090-3973

    DOI: 10.1520/JTE101030

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    Title Dynamic Characteristics of Different Aspect Ratios of Small Hydraulic Orifices Using a Pressure Square Wave Generator
    Symposium , 0000-00-00
    Committee D19