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정일호(Ilho Jung),이수호(Sooho Lee),서종휘(Jonnghwi Seo),박태원(Taewon Park),정래훈(Raehun Jung) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Analysis of brake characteristics has progressed rapidly in recent years, as computer techniques have developed. However, there are many problems in predicting braking characteristics, due to the numerous design variables of the brake system. Therefore, a synthetic braking performance analysis is required for all brake system parts such as master cylinder, booster, control valve and split system.<br/> In this paper, a program which can analyze braking performance such as force distribution, braking efficiency, pedal force and pedal travel, is presented. The preprocessor of the program helps users prepare input files through a dialog box. An additional postprocessor makes the graph presentation of solved results. Also, a simple example problem is applied to show the usefulness of the presented program.<br/>
정일호(Ilho Jung),이진형(Jinhyoung Lee),박태원(Taewon Park),김혁(Hyuk Kim),조동협(Donghyeob Cho),박중경(Joongkyung Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
In this paper, a computer aided engineering (CAE) method is proposed for a fatigue life prediction in the early design stages using the multibody dynamics analysis and the linear damage rule. From a dynamic analysis of the OHT vehicle system, dynamic load time histories of vehicle components are calculated. From a finite element analysis of components, modal stresses are calculated. Through the dynamic load time history and the static stress of the component, a dynamic stress time history is produced using the superposition principle. Using the linear damage rule and the cycle counting method, the fatigue life is predicted from the dynamic stress time history. The process of predicting the fatigue life using the proposed computer models in this paper may be applied to structures of various dynamic systems.
정일호(IlHo-Jung),문하경(HaKyung-Moon),박태원(TaeWon-Park),김혁(Hyuk-Kim),이형(Hyung Lee),박중경(JoongKyung-Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
In this study, OHT dynamic model was developed by using the multi body dynamic analysis program ADAMS. Wheel and roller are modeled by the 3-D surface contact module. Especially, motor cycle tire mechanics is used in the wheel contact model. The OHT dynamic model can analyze the dynamic characteristic of the OHT vehicle with various driving conditions. And the result was verified by a vehicle traveling test. As a result of this study, the developed model is expected to predict wheel dynamic load time history and makes a contribution to design of a new monorail vehicle.
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.
Digital Human Simulation을 활용한 방사성 폐기물 처리장 주제어실의 인체공학적 평가
이백희(Baekhee Lee),장윤(Yoon Chang),정기효(Kihyo Jung),정일호(Ilho Jung),유희천(Heecheon You) 대한인간공학회 2010 大韓人間工學會誌 Vol.29 No.3
The present study evaluated a preliminary control room (CR) design of radioactive waste facility using the JACK<SUP>®</SUP> human simulation system. Four digital humanoids (5<SUP>th</SUP>, 50<SUP>th</SUP>, 95<SUP>th</SUP>, and 99<SUP>th</SUP> percentiles) were used in the ergonomic evaluation. The first three were selected to represent 90% of the target population (Korean males aged 20 to 50 years) and the last to reflect the secular trend of stature for next 20 years in South Korea. The preliminary CR design was assessed by checking its compliance to ergonomic guidelines specified in NUREG-0700 and conducting an in-depth ergonomic analysis with a digital prototype of the CR design and the digital humanoids in terms of postural comfort, reachability, visibility, and clearance. For identified design problems, proper design changes and their validities were examined using JACK. A revised CR design suggested in the present study would contribute to effective and safe operations of the CR as well as operators' health in the workplace.