배관 압력을 이용한 방향제어밸브 위상각 대역폭 주파수 측정에 관한 연구

다국어 초록 (Multilingual 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.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 이론 배경
• 3. 실험 장치 구성
• 4. 실험 결과 및 분석
• 5. 결론
• References

참고문헌 (Reference)

1 김성동, "미터링 오리피스를 이용한 방향제어밸브 위상각 대역폭 주파수 측정에 관한 연구" 사단법인 유공압건설기계학회 15 (15): 1-9, 2018

2 김성동, "미터링 오리피스 압력 진폭을 이용한 방향제어밸브 대역폭 주파수에 관한 연구" 사단법인 유공압건설기계학회 14 (14): 1-8, 2017

3 R. A. Nasca, "Testing Fluid Power Components" Industrial Press Inc 212-240, 1990

4 W. J. Thayer, "Specification Standards for Electrohydraulic Flow Control Servo Valves, Moog Technical Bulletin 117" Moog Inc. Control Division 1962

5 K. Ogata, "Modern Control Engineering" Prentice-Hall, Inc 1970

6 "KS B 6511 Test Methods for Electro – Hydraulic Proportional Directional Series Flow Control Valves"

7 "ISO 10770-1 Hydraulic Fluid Power – Electrically Modulated Hydraulic Control Valves – Part 1: Test Methods for Four-way Directional Flow Control Valves" 1998

8 I. Y. Lee, "Hydraulic Power Engineering" Munundang Publishing Co 585-591, 2012

9 M.. Rabie, "Fluid Power Engineering" McGraw-Hill Professional 2009