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접촉문제에서의 변분부등식의 유한요소해석과 A Priori 오차계산법
이춘열,Lee, Choon-Yeol 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.9
Governing equations infrictional contact problems are introduced using variational inequality formulations which are regularized to overcome the diffculties of non-differentiability of the friction functional. Also finite element approximations and a priori error estimations are derived based on those formulations. Numerical simulations are performed illustrating the theoretical results.
자동차 클러치 다이어프램 스프링의 유한요소해석 및 최적설계
이춘열,채영석,권재도,남욱희,김태형,Lee, Chun-Yeol,Chae, Yeong-Seok,Gwon, Jae-Do,Nam, Uk-Hui,Kim, Tae-Hyeong 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
A diaphragm spring is an important component of a clutch assembly, characteristics of which depends largely on that of a diaphragm spring. A diaphragm spring is subject to high stress concentration in driving condition, which frequently causes cracks and fracture around finger area. In this paper, behavior of a diaphragm spring is analysed by finite element method to calculate sensitivity of design parameters, which is used to perform optimal design of diaphragm spring shape. As an object function, hoop stresses are taken and minimized to improve durability. Characteristics of the diaphragm is used as equality constraint to maintain the original design purpose and sequential linear programming(SLP) is utilized as an optimization tool. With optimized design, it is verified that concentrated stress is decreased maintaining release load characteristic.
이춘열 국민대학교 정보기술연구소 2004 정보기술연구 Vol.10 No.-
This study expands data quality management to include data transformation processes as well as data. Further, an information structure graph is applied to represent data transformations processes. An information structure graph is based on a relational database scheme. Thus, data transformation processes may be stored in a relational database. This kind of integration of data transformation metadata with technical metadata eases evaluation of database qualities and their causes.
기둥형 로드셀 감지부의 설계변수에 따른 비선형 거동해석
이춘열,강대임,Lee, Chun-Yeol,Gang, Dae-Im 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
Recently, force measurement systems are commonly used in many industrial fields and the precision of the measurement system is getting more important as the industry needs more precise tools and in struments to make high quality products. However, a high precision force measurement system is hard to make unless we know precisely the causes, quality and quantity of measurement errors in advance. In this work, many possible mechanical causes of measurement errors are reviewed including ratio of length to diameter of sensing part, radius of contact area, radius of bearing part, ratio of material properties and change of boundary conditions. Also, the measurement errors are analyzed by nonlinear finite element method and the nonlinear behavior of the errors are investigated. The results can be used to design force measurement systems and expected to be very useful especially for compact type load cells.