서지주요정보
능동식 현가시스템용 전자비례 유압 감압밸브의 해석 및 설계에 관한 연구 = Dynamic analysis and design of an electro-hydraulic pressure reducing valve for active suspension systems
서명 / 저자 능동식 현가시스템용 전자비례 유압 감압밸브의 해석 및 설계에 관한 연구 = Dynamic analysis and design of an electro-hydraulic pressure reducing valve for active suspension systems / 이동음.
저자명 이동음 ; Lee, Dong-Eum
발행사항 [대전 : 한국과학기술원, 1997].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8007167

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 97020

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

An extensive laboratory study was made of a slow active suspension pressure control, which can regulate the pressure in an actuator fitted to each wheel to control vehicle attitude. A proportional pressure reducing valve (PPRV) has been employed to optimize the vehicle attitude and tires' contact with road surfaces under any load and surface conditions. In response to the electric current to the proportional solenoid, the PPRV can control the actuator pressure. Two-stage PPRV's, which have been used in actual active suspension systems, give rise to relatively high energy loss compared with single-stage valves. This was due to the return flow at the pilot stage, which increased fuel consumption of the vehicle. Consequently the efficiency of the active suspension system was deteriorated. Furthermore, it was found that very small orifices in a two-stage PPRV often cause silting problems and malfunction of the valve. In this study, a new type of single-stage PPRV was proposed as a substitute for the two-stage PPRV to overcome the afore-said problems. The stability characteristics of the proposed valve system was scrutinized via linearization and root locus method. The step response and parameter sensitivity with respect to the reduced pressure were analyzed to investigate the effects of variations in main system parameters on the system behaviors. Based on theoretical and experimental studies, the nominal values of proposed single-stage PPRV for slow active suspension systems were presented. The prototype valve showed good linearity and small hysteresis in the relationship of reduced pressure versus input voltage to the proportional solenoid. The damping piston, which was directly linked to the valve spool, could improve the valve stability effectively. Satisfactory reduced pressure responses were obtained in the step response experiments. To achieve the faster step response of the controlled pressure, the push rod size was increased and the nonsymmetric spool lands and sleeve were provided in the design of the single-stage PPRV. The redesigned prototype valve was tested in the experimental setup and the performance of the valve was compared with that of the two-stage PPRV. It was found from the experimental results that the new single- stage PPRV could be used as a substitute for a two-stage PPRV in slow active suspension systems.

서지기타정보

서지기타정보
청구기호 {DME 97020
형태사항 x, 93 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 파일럿 작동방식 전자비례 감압밸브의 해석
저자명의 영문표기 : Dong-Eum Lee
지도교수의 한글표기 : 이정오
지도교수의 영문표기 : Chung-Oh Lee
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 72-78
주제 직동식 전자비례 감압밸브
저주파수 능동식 현가시스템
댐핑피스톤
동특성 해석 및 설계
Single-stage proportional pressure reducing valve
Slow active suspension system
Damping piston
Dynamic analysis and design
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