서지주요정보
내연기관 피스톤-링 결합체 마찰력 측정 시스템의 개발 및 마찰력 측정에 관한 연구 = A study on the development of piston-ring assembly friction force measuring system and its measurement in I.C. engines
서명 / 저자 내연기관 피스톤-링 결합체 마찰력 측정 시스템의 개발 및 마찰력 측정에 관한 연구 = A study on the development of piston-ring assembly friction force measuring system and its measurement in I.C. engines / 윤정의.
저자명 윤정의 ; Yun, Jeong-Eui
발행사항 [대전 : 한국과학기술원, 1993].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

8003311

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 93006

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

In reciprocating internal combustion engines, understanding the friction characteristics between piston ring and cylinder liner is very important for the engine performance and its reliability. Measurement of the friction force of the piston-ring assembly provides very useful information for clarifying complex tribological phenomena. The present study deals with the improvement of measuring technique in the instantaneous IMEP method, the development of the direct measuring system employing a moveable bore system, and the investigation of the friction force characteristics of the piston-ring assembly under various modes of engine operations. First, in order to improve the confidence of measured friction force data by the instantaneous IMEP method, following steps were taken. For minimization of the error in the final result, the frequency response function was determined for each measuring system, and the relative time delays among the measured signals were obtained by the application of the cross-correlation function. Secondly, a new system was developed for the piston-ring assembly friction force measurement. This system had a relatively high fundamental frequency at 884 Hz and a fine resolution of 0.5 N in friction force measurement. Comparing with existing floating liner systems this system required small installation space and, at the same time alleviated the system noise problem induced by piston thrust and slap impulse forces. Finally, this new system was applied to the friction force measurement to find its functional relationship with variables such as engine speed, oil viscosity and engine load. The friction mean effective pressure (fmep) was found to have a linear relationship with $(\upsilon{U})^{0.42}$ under motoring and with $(\upsilon{U})^{0.45}$ under firing operations, where $\upsilon$ is the kinematic oil viscosity and U is mean piston speed.

서지기타정보

서지기타정보
청구기호 {DME 93006
형태사항 xi, 119 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 피스톤-링 결합체 마찰력 측정 시스템 도면
저자명의 영문표기 : Jeong-Eui Yun
지도교수의 한글표기 : 김상수
지도교수의 영문표기 : Sung-Soo Kim
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 참고문헌 : p. 104-110
주제 Assembling machines.
Friction.
Internal combustion engines.
Vibration --Measurement.
Tribology.
마찰력. --과학기술용어시소러스
내연 기관. --과학기술용어시소러스
측정기. --과학기술용어시소러스
윤활. --과학기술용어시소러스
진동 측정. --과학기술용어시소러스
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