Browse > Article
http://dx.doi.org/10.7839/ksfc.2018.15.4.001

A Study on the Phase Bandwidth Frequency of a Directional Control Valve Based on the Hydraulic Line Pressure  

Kim, Sungdong (Department of Mechanical System Engineering, Kumoh National Institute of Technology)
Lee, Jung-eun (Department of Mechanical Engineering, Kumoh National Institute of Technology, Graduate School of Industry)
Shin, Daeyoung (Heat Treatment R&D Group, Korea Institute of Industrial Technology)
Publication Information
Journal of Drive and Control / v.15, no.4, 2018 , pp. 1-10 More about this Journal
Abstract
Spool displacement of a direction control valve is the standard signal to measure the bandwidth frequency of the direction control valve. When the spool displacement signal is not available, it is suggested in this study to use the metering hydraulic line as an alternative way to measure - 90 degree phase bandwidth frequency of the hydraulic direction control valve. Dynamics of the hydraulic line is composed of inertia, capacitance, and friction effects. The effect of oil inertia is dominant in common hydraulic line dynamics and the line dynamics is close to a derivative action in a range of high frequency; such as a range of bandwidth frequency of common directional control valves. Phase difference between spool displacement and line load pressure is nearly constant as a valve close to 90 degree. If phase difference is compensated from the phase between valve input and pressure, compensated phase may be almost same as the phase of spool displacement that is a standard signal to measure phase bandwidth frequency of the directional control valve. A series of experiments were conducted to examine the possibility of using line pressure in to measure phase bandwidth frequency of a directional control valve. Phase bandwidth frequency could be measured with relatively high precision based on metering hydraulic line technique and it reveals consistent results even when valve input, oil temperature, and supply pressure change.
Keywords
Frequency Response; Bandwidth Frequency; Metering Hydraulic Line; Phase Angle; Directional Control Valve;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 ISO 10770-1 Hydraulic Fluid Power - Electrically Modulated Hydraulic Control Valves - Part 1: Test Methods for Four-way Directional Flow Control Valves. 1998.
2 W. J. Thayer, "Specification Standards for Electrohydraulic Flow Control Servo Valves, Moog Technical Bulletin 117", Moog Inc. Control Division, 1962.
3 R. A. Nasca, "Testing Fluid Power Components", Industrial Press Inc. (New York USA), ISBN 0-8311-3002-4, pp212-240, 1990.
4 KS B 6511 Test Methods for Electro - Hydraulic Proportional Directional Series Flow Control Valves. 2011.
5 S. D. Kim, S. H. Jeon and D. Y. Shin, "A Study on the Bandwidth Frequency of Directional Control Valves based on the Amplitude of the Metering-Orifice Pressure", Journal of Drive and Control, Vol.14, No.2, pp.1-8, 2017.   DOI
6 S. D. Kim, S. H. Jeon and J. S. Yun, "A Study on the Phase Bandwidth Frequency of a Directional Control Valve Based on the Metering Orifice", Journal of Drive and Control, Vol.15, No.1, pp.1-9, 2018.   DOI
7 M.. Rabie, Fluid Power Engineering, McGraw-Hill Professional, New York, 2009.
8 I. Y. Lee and Education Division of Bosch Rexroth Korea, Hydraulic Power Engineering, Munundang Publishing Co., Seoul, pp.585-591, 2012.
9 K. Ogata, Modern Control Engineering, Prentice-Hall, Inc., New Jersey, 1970.