Journal of the Korean Society for Precision Engineering (한국정밀공학회지)
- Volume 12 Issue 2
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- Pages.79-86
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- 1995
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- 1225-9071(pISSN)
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- 2287-8769(eISSN)
A Study on the Frequency response charcteristics of Hydraulic Equipment using High speed on-off valve
고속전자밸브를 사용한 유압장치의 주파수응답특성에 관한 연구
- Huh, Jun-Young ;
- Wennmacher, G. (RWTH Aachen IHP)
- 허준영 (한국기술교육대학 제어기계공학과) ;
- Published : 1995.02.01
Abstract
Frequency response method is used to design hydraulic servo systems and improve its performance. In this study a method is proposed to get simply the frequency response of the electro-hydraulic servo system which use PWM controlled high-speed on-off valves. Firstly, the describing function of the PWM element is derived and tested. It is found that the character- istic of PWM element could be approximated to a saturation characteristic in the range of allowable frequency. And the dynamic characteristic of the valve-cylinder system could be negligible. The working characteristic of high-speed on-off valve is considered as time delay. So simulation is performed in the basis of the reconstructed block diagram. And this method is verified by experiments.
Keywords