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이경돈(Kyoungdon Yi),김승학(Seunghak Kim),윤동영(Dongyoung Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Radial pressure and force of press fit are related with the fatigue life of 1<SUP>st</SUP> generation wheel bearing unit. But most design hand books for bearing or bearing catalogues are different with real force and pressure. So the purpose of this study is to predict the radial pressure and press fit force of bearing. This study considers the state of stress on an infinitesimal element of thickness per unit, described by polar coordinate, which is used for leading basic equations of radial pressure. But basic equations are not accurate. So we must consider other factors that are plastic deformation, surface roughness, shape of mounted parts and friction. This study measures the plastic deformation, calculates radial pressure by finite element method and test friction between two contact parts. The final aim of this study is making accurate equations for press fits of wheel bearing. And this study will be reference for auto parts designers.
이경돈(Kyoungdon Yi),김승학(Seunghak Kim),윤동영(Dongyoung Yoon) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Consumers began to be interested in NVH side except automotive performance according to development of a vehicles technology. Specially, many among main NVH problem that happen in vehicles was referred with brake system, and many factors were referred with DISC DTV, LRO and roughness. Recently, Car makers began to be interested in noise that is cased by disc harmonic DTV additional. In this study, proved interrelation with harmonic degree occurrence and speed of disc and grinding wheel revolution at grinding process through FFT analysis, and analyzed effect that grinding stabilization time and FEED speed get to HARMONIC DTV. Target of this study is to find most suitable grinding condition conclusively.
유영승(Youngseung Yu),이경돈(Kyoungdon Yi),김승학(Seunghak Kim),한상원(Sangwon Han) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The weight reduction of suspension components has been a major concern of auto makers to make high efficiency vehicles. Recently, a cored ductile iron casting has been used to achieve high strength lightweight suspension components. In this paper, development procedures of hollow steering knuckle by cored ductile iron casting are discussed. To meet market needs, an integrated approach to optimizing structural casting designs was developed. The developed hollow steering knuckle cal achieve a 5% weight reduction and high strength over a solid knuckle
황철하(Chulha Hwang),정일호(Ilho Jung),박태원(Taewon Park),김승학(Seunghak Kim),이경돈(Kyungdon Yi) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
To predict the Hub Bearing Unit(HBU)'s fatigue life, a non-linear equation including effects of preload or initial axial clearance should be calculated. However, the equation is composed of complex elliptic integrals and stiffness matrix. In order to solve the equation, this program is developed by using numerical analysis and analytical approach. As a result of using the program, The HBU’s performance data, such as load distribution, max. contact stress and fatigue life, are obtained easily and promptly.<br/> In this paper, The preprocessor of the program helps users to prepare input data through a dialog box and the postprocessor makes the graph presentation of solved results.