Journal of Drive and Control (드라이브 ㆍ 컨트롤)

The Korean Society for Fluid Power and Construction Equipment (유공압건설기계학회)
권호 표지
DOI QR코드

DOI QR Code

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

배관 압력을 이용한 방향제어밸브 위상각 대역폭 주파수 측정에 관한 연구

  • 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)
  • Received : 2018.07.26
  • Accepted : 2018.09.18
  • Published : 2018.12.01
Download PDF
⟨ Previous Next ⟩

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

OGSSB4_2018_v15n4_1_f0001.png 이미지

Fig. 1 Schematic view to use the metering hydraulic line for measurement of the bandwidth frequency of a directional control valve

OGSSB4_2018_v15n4_1_f0002.png 이미지

Fig. 2 Serial structure transfer function system

OGSSB4_2018_v15n4_1_f0003.png 이미지

Fig. 3 Photographic view for the hardware part of the bandwidth frequency measuring device

OGSSB4_2018_v15n4_1_f0004.png 이미지

Fig. 4 Time domain responses of valve input i, spool displacement xv and the pressure pLv

OGSSB4_2018_v15n4_1_f0005.png 이미지

Fig. 5(a) Phase frequency response of i→xv

OGSSB4_2018_v15n4_1_f0006.png 이미지

Fig. 8 Comparison between the phase bandwidth frequencies of ' ∡ i → xv ' and ' ∡ i → pLv - '∡ xv → pLv $ | $ comp ' for $\phi$0.25 in hose

OGSSB4_2018_v15n4_1_f0008.png 이미지

Fig. 9 Comparison between the phase bandwidth frequencies of ' ∡ i → xv ' and ' ∡ i → pLv - ∡ xv → pLv $ | $ comp ' for $\phi$0.5 in hose

OGSSB4_2018_v15n4_1_f0009.png 이미지

Fig. 10 Phase frequency responses of ' ∡ xv → pLv ' for 2.5 V, 5 V and 9 V inputs

OGSSB4_2018_v15n4_1_f0010.png 이미지

Fig. 11 Effect of the oil temperture variation on the bandwidth frequencies

OGSSB4_2018_v15n4_1_f0011.png 이미지

Fig. 12 Effect of the supply pressure variation on the bandwidth frequencies

OGSSB4_2018_v15n4_1_f0012.png 이미지

Fig. 5(b) Phase frequency response of xv → pLv

OGSSB4_2018_v15n4_1_f0013.png 이미지

Fig. 5(c) Phase frequency response of i →pLv

OGSSB4_2018_v15n4_1_f0014.png 이미지

Fig. 6 Comprison between Phase frequency responses of '∡ i → xv' and '∡ i → pLv - ∡ xv → pLv '

OGSSB4_2018_v15n4_1_f0015.png 이미지

Fig. 7 Comparison between the phase bandwidth frequencies of '∡ i → xv ' and ' ∡ i → pLv - ∡ xv → pLv $ | $ comp ' for $\phi$0.011 m steel tube

Table 1 Parameters related to a hydraulic line and oil

OGSSB4_2018_v15n4_1_t0001.png 이미지

Table 2 Specification of the metering hydraulic line system

OGSSB4_2018_v15n4_1_t0002.png 이미지

Table 3 Error of the measured bandwidth frequencies for 3 metering hydraulic lines

OGSSB4_2018_v15n4_1_t0003.png 이미지

Table 4 Error of the measured bandwidth frequencies for environmental factors

OGSSB4_2018_v15n4_1_t0004.png 이미지

References

  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. https://doi.org/10.7839/KSFC.2017.14.2.001
  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. https://doi.org/10.7839/KSFC.2018.15.1.001
  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.

Cited by

  1. Independent Metering Valve: A Review of Advances in Hydraulic Machinery vol.17, pp.4, 2018, https://doi.org/10.7839/ksfc.2020.17.4.054