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KTX차량의 편성차량수가 후미 불안정 진동에 미치는 영향
강부병(Kang. Bu-Byoung),정흥채(Chung. Heung-Chai) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The acceptance of KTX has been performed on Korea. During the test, lateral vibration of earboby over the accepted yalua calld sway was founf, KTX has 20 formtion whose trailer cars are linked by artieulate bogies. So this study is performed to see to effectes of long trainset formation on vehiale dynamics. and the train stability by 20 car vehivle model. Firstly the reliable madel which shows well the tendencies appeared in the tests on the high speed test line is required to find to find the cause of lateral vibration and the countermeasure. Vehicle model was made for the analysis with VAMPRE. Theanalysis results show that seeondary air spring lateral stiffness is most significant parameter to cause catbody lateral vibration Mode analysis results show that the least damped mode shape is similar to the vibration pattern shown in the tests that the amplitude of the motion increases along the train set 물 decreases in the tail part. For the case of short train formation with 7 or 10cars, sway does not happen. But in the ease of longer train formation with 16 or 20 cars,sway was found.
이태형,김상수,김석원,김기환,정흥채,Lee, Tae-Hyung,Kim, Sang-Soo,Kim, Seog-Won,Kim, Ki-Hwan,Chung, Heung-Chai 한국시스템엔지니어링학회 2011 시스템엔지니어링학술지 Vol.7 No.2
A high-speed railway system represents a typical example of large-scale multi-disciplinary system, consisting of subsystems such as rolling-stock, electrical hardware, electronics, control, information, communication, civil technology etc. The system design and acquisition data of the large-scale system must be the subject under strict configuration control and management. Systems engineering technology development project for Korea next generation High-speed Electric Multiple Unit (HEMU) system in progress is a national large system development project that is not only a large-size and complex but also multi-disciplinary in nature. Therefore, all stakeholders must understand and share the functional and performance requirements of HEMU throughout its life-cycle phases. Also in the test and evaluation phase, all systems requirements must be verified. In 2011, the prototype train manufacturing will be completed. It will do test run on the commercial line and all systems requirements are verified until 2012. For the system verification, the test and evaluation process have to be established before the test trial run. Using a systems engineering tool, the system design database(SDD) with requirements traceability and development process management in the course of the development have to be established. This paper represents the test and evaluation process development based on the SEMP(Systems Engineering Management Plan) developed in the design stage. The test and evaluation process is refined and updated in comparison to the design stage one. The test and evaluation process consists of procedure, test and evaluation method and schedule. So through this process, it is defined that each systems requirements is verified on which test and about what time.
한국형 고속전철의 답면제동에 의한 차륜의 응력분포에 관한 연구
권범진(Bum-Jin Kwon),정흥채(Heung-Chai Chung),김호경(Ho-Kyung Kim) 한국철도학회 2002 철도저널 Vol.5 No.3
The influence of thermal stress at tread breaking in Korean High Speed Train wheel was investigated using tile coupled thermal-mechanical analysis technique. The mechanical load or wheel-rail contract load and braking load were considered during FEM analysis. During the stop braking, the effect of mechanical stress on the combined stress is relatively larger than that of thermal stress in the rim of wheel. However, the effect of thermal stress is relatively larger than that of mechanical stress in the plate of wheel. When 300% of the block force was applied, the maximum von Mises stress of 61.0 MPa was found at the outside plate around 400 mm far away from the wheel center.
수치해석을 이용한 철도차량 동특성 주행시험기 활용성 기초 검토
정우진(Woo-Jin Chung),정흥채(Heung-Chai Chung) 한국철도학회 2005 한국철도학회논문집 Vol.8 No.1
Roller test rig is the test facility for acquiring the data related dynamic characteristics of rolling stocks handily. The test method using roller test rig could be convenient to get information about hunting and others rather than using field test. However, adopting this method brings about the inconvenient calibration process for measured data. This kind of additional effort results from the difference of contact condition between field test and test roller rig. In this paper, the numerical approach is used to get the amount of calibration. The analysis results of the field test are compared with results of the roller test rig to know what kind of alternation happens according to the change of contact condition.
철도차량에서의 Virtual Engineering 기술 적용
전현규(Jun Hyun Kyu),옥민환(Ohk Min Hwan),양도철(Yang Doh Chul),정흥채(Chung Heung Chai) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
The virtual engineering technologies have been broadly used for the design, testing, manufacturing and maintenance works of industrial product. Recently many VR systems with walk through navigation and web databases; such as design and installation database, load history database, maintenance history database et al. are developed. However, the virtual engineering in railroad industry is not well developed compared to other industries like automobile, air, shipbuilding. In this paper, we explain the strategy that we have applied the virtual engineering technology to the design works of rolling stock and our plan to build the virtual testing laboratory(VTL) in the Korea Railroad Research Institute.
서정원(Jung-won Seo),구병춘(Byenug-Choon Goo),정흥채(Heung-Chai Chung) 한국철도학회 2003 철도저널 Vol.6 No.2
A wheel and axle failure can cause a derailment with its attendant loss of life and property. The service conditions of railway vehicles have become severe in recent years due to a general increase in operating speeds. Damages of railway wheel are a spalling by wheel/rail contact and thermal crack by braking heat etc. One of the main source of damage is a residual stress. therefore it is important to evaluate exactly. A Residual stress of wheel is formed at the process of heat treatment when manufacturing. it is changed by contact stress developed by wheel/rail contact. Distributions of residual stress vary according to a magnitude of wheel load, a magnitude of friction when acceleration and deceleration. The objective of this paper is to estimate the influence of wheel motion on the residual stress distribution in the vicinity of the running surface.
허현무(Hyun-Moo Hur),서정원(Jung-Won Seo),정흥채(Heung-Chai Chung),구동회(Dong-Hoe Goo) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Railway wheel/rail contact conditions have an influence on dynamic behavior of rolling stock. lf there are problems or incompatibility between wheel and rail. damages like wheel wear. wheel spatting, rail wear, etc are occurred. Especially wheel and rail profiles arc important factor or vehicle curving performance. so compatibility study between wheel and rail has to be carried out preferentially. In this study. we have analyzed the compatibility between wheel and rail of KNR conventional line to improve the maintenance efficiency of wheel and rail. Thus we showed the results relating to wheel/mil geometric contact, vehicle running performances as the change of wheel/rail combination.
서정원(Seo Jung-Won),구병춘(Goo Byeung-Choon),이동형(Lee Dong-Hyeong),정흥채(Chung Heung-Chai) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway wheel and axle are the most critical components in railway system. A wheel and axle failure can cause a derailment with its attendant loss of life and property. The service conditions of railway vehicles have become severe in recent years due to a general increase in operating speeds. Therefore, more precise evaluation of wheel set strength and safety has been desired. Damages of railway wheel are a spalling by wheel/rail contact and thermal crack by braking heat etc. One of the main source of damage is a residual stress, therefore it is important to evaluate exactly. A Residual stress of wheel is formed at the process of heat treatment when manufacturing. it is changed by contact stress developed by wheel/rail contact and thermal stress from heat induced in braking. The objective of this paper is to estimate the variation and magnitude of the residual stress of railway wheel.
한국형 고속전철의 답면제동에 의한 차륜의 응력분포에 관한 연구
권범진(Kwon Bum-Jin),김호경(Kim Ho-Kyung),정흥채(Chung Heung-Chai) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The strength evaluation of a wheel is becoming very important due to the high speed of railway system and the reduction of wheel weight. Therefore, in this study, the influence of thermal stress at tread breaking in Korean High Speed Train wheel was investigated using FEM. During FEM analysis, the mechanical load or wheel-rail contract load and braking load were considered. When 300% of the block force was applied, the maximum von Mises stress of 61.0 ㎫ was found at the outside plate around 400㎜ far away from the wheel center.
서정원(Seo Jung-Won),허현무(Hu Hun-Mu),이동형(Lee Dong-Hyeong),정흥채(Chung Heung-Chai) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway wheels and axles belong to the most critical components in railway vehicles. The service conditions of railway vehicles became more severe in recent years due to the increase of speed. Therefore, a more precise evaluation of wheelset life and safety has been requested. One of the major reasons of railway wheel damage is a contact zone failure by wheel/rail contact. In this paper, we conducted a rolling contact fatigue test for wheels using a specimen of wheel/rail. the behavior of hardeness and residual stress below the contact surface of the test pieces in the fatigue process were analyzed. Finally, the relation between fatigue life and contact pressure was obtained.