객차의 현가장치 변수가 상하진동에 미치는 영향

허현무,권영필,최경진,Hur, Hyun-Moo,Kwon, Young-Pil,Choi, Kyung-Jin 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7

The purpose of this study is to analyze the effects of the parameters of the suspension system in railway rolling-stock for KT-23 type passenger vehicle. According to the results of simulation and the field test, Optimal condition was obtained for the stiffness ratio of the primary spring and the secondary of the suspension system. When the stiffness ratio was increased, the vibration was increased on the car body and decreased on the bogie, and ride quality are getting worse because of increase of the vertical natural frequency of the car body. The results of this study are usefull to improve the technology of the ride quality of KT-23 type vehicle.

고속철도차량 동력차 진동 및 승차감 수준 분석

허현무(Hyun-Moo Hur),박준혁(Joon-Hyuk Park),김남포(Nam-Po Kim),유원희(Won-Hee You) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11

Recently, high speed train became the mainstream of the public transportation in Korea. Thus ride quality level of the passengers or train drivers is important in the viewpoint of ride comfort. In this paper, we evaluated the ride levels of high speed train. We measured the carbody accelerations for power car and passenger coach of high speed train and evaluated ride levels. As test results, the ride level of power car is higher than that of passenger coach. We think that this result is caused by primary and secondary suspension structure of the bogie system. We expect that these test results is useful in the area of bogie suspension design of railway vehicle.

철도차량용 코일스프링 횡강성 해석

허현무(Hyun-Moo Hur),안다훈(Da-Hoon Ahn) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.9

철도차량의 거동을 해석하기 위하여 다물체 동역학 모델을 구성함에 있어 현가시스템을 구성하는 스프링, 댐퍼와 같은 현가요소에 대한 스프링강성이나 감쇠계수와 같은 물성치 파악은 매우 중요하다. 그 중 1차, 2차 현가시스템에 주로 활용되고 있는 코일스프링에 대한 동역학 모델을 구성함에 있어 축방향 강성은 도면이나 설계자료에 명확하게 명시되어 있지만 횡방향에 대한 물성은 명시되어 있지 않아 동역학 해석 모델 구성에 어려움을 안고 있다. 따라서 본 논문에서는 철도차량의 현가시스템에 폭 넓게 적용되고 있는 코일스프링에 대한 횡강성을 해석하기 위한 모델에 대하여 검토하고자 한다. 코일스프링 시료에 대한 횡강성을 해석하고자 유한요소해석 방법을 수행하였고 Krettek와 Sobczak의 코일스프링 횡강성 해석모델을 적용하여 수치해석을 수행하였다. 그리고 코일스프링 시료를 대상으로 횡강성 특성시험을 수행하여 해석모델과의 적합성을 검토하였다. 시험결과와 비교한 결과, Krettek와 Sobczak의 코일스프링 횡강성 해석모델을 적용하고 보정계수를 수정한 결과가 시험결과에 근사한 결과를 얻을 수 있었다. In constructing the multi-body dynamics model to analyze the behavior of the railway vehicle, it is very important to understand the properties of the suspension elements that constitute the suspension system. Among them, coil springs, which are mainly used in primary and secondary suspension systems, clearly show the axial stiffness in the drawings, but the lateral properties of the coil springs are not specified clearly, making it difficult to construct a dynamic analysis model. Therefore, in this paper, the model for analyzing the lateral stiffness of the coil spring is examined. A finite element method was applied to analyze the lateral stiffness of the coil spring and numerical analysis was performed by applying the coil spring lateral stiffness analysis model proposed by Krettek and Sobczak. And the test to analyze the lateral stiffness of coil spring was conducted. As a result of comparing with the test results, it was found that the results obtained by applying the lateral stiffness analysis model of Krettek and Sobczak and correcting the correction coefficient are similar to those of the test results

철도차량 차체/대차간 상대변위를 이용한 곡선구간 곡률반경 추정 방법

허현무(Hyun Moo Hur),박준혁(Joon Hyuk Park),유원희(Won Hee You) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.11

철도차량 곡선구간 주행 시 곡선주행성능을 향상시키기 위한 능동형 철도차량 개발 분야에서 곡선구간을 실시간으로 인식하기 위한 기술 확보는 매우 중요하다. 그러나 고가의 전용 검측차량을 이용하거나 여러 가지 센서를 복합적으로 이용하는 기존의 곡률반경 추정방법은 실차에 적용하기에는 실용성이 미흡하다. 따라서 본 논문에서는 실차에 적용이 용이하고 경제적인 곡률반경 추정방법을 제안하였다. 새로운 방법은 철도차량 곡선구간 주행 시 발행하는 차체와 대차간의 상대변위를 측정하여 곡률반경을 실시간으로 추정할 수 있는 방법이다. 본 제안 방법의 타당성을 검토하기 위하여 모사해석 및 실차시험을 수행하였으며 그 결과, 제안한 곡률반경 추정방법의 타당성을 확인하였다. The development of a technique for the real-time sensing of a curve section is very important for active rolling-stocks in order to improve the curving performance. However, conventional methods using expensive track inspection equipment or various complex sensors are not practicable to be applied to commercial vehicles. Therefore, we have proposed a new method to estimate the curve radius of a curve section. This method uses the relative displacements occurring between the body and the bogie when the rolling-stock is running on a curve. To verify the validity of this method, we conducted a vehicle dynamics simulation and test using a real vehicle on a test line. The results confirmed the validity of the proposed method. We expect that this method will be effectively applied in studies of active rolling-stocks to increase the curving performance using active control technology.

Wheelset Steering Angle of Railway Vehicle according to Primary Suspension Property

허현무(Hyun Moo Hur),안다훈(Da Hoon Ahn),박준혁(Joon-Hyuk Park) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.7

틸팅차량용 차륜답면형상안 설계 및 주행특성 해석

허현무(Hyun-moo Hur),서정원(Jung-won Seo),김재훈(Jae-hoon Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11

For the improvement of a conventional train's speed, tilting train is under the development aiming for a maximum speed 180km/h. Compared to an existing conventional rolling-stock, tilting train could take an advantage of between 20% and 30% of speed improvement on curve sections due to the improvement of curving performance. However, this improvement creates a severe load at wheels and results in the damage of its wheel and rail, relative to the operating condition of an existing rolling-stock. Consequently, it is efficient to develop a wheel profile for tilting train to minimize its damage and satisfy the current operating qualification. This thesis presents the design of wheel profile for tilting train to prevent its damage. Conducting the geometrical contact analysis, dynamic analysis, and contact stress analysis, the effect of proposed wheel profile had been examined compared to the performance of an existing wheel profile.

고속철도 차륜답면의 마모 특성에 관한 연구

허현무(Hyun-Moo Hur),유원희(Won-Hee You) 한국철도학회 2005 한국철도학회논문집 Vol.8 No.5

Through a year’s commercial operation, Korea High Speed Railway has solved defectives from several breakages at the beginning and is going into the stage of stable operation. Among issues, wheel wear becomes a matter of primary concerns in view of vehicle’s stability and maintenance. It was understood as above that wear status has been improved in the test by which railway system including vehicles and tracks was stabilized during a year’s commercial operation, comparing to that with excessive wear in the trial operation prior to opening to the public. To make out wheel's wear status and characteristics of equivalent conicity at present when the service has been introduced a year ago and the average cumulative mileage of vehicles reach almost 500,000km, wheel's wear types were analyzed with the current vehicles in service.

대차 조향 특성 시험을 위한 축소 트랙 개발

허현무(Hur Hyun-Moo),박준혁(Park Jun-Hyuk),유원희(You Won-Hee),박태원(Park Tae-Won) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-

The performance of the railway bogie is classified into the stability and the steering performance. Testing for the bogie stability is conducted on the roller rig. But testing for the bogie steering performance on test facility is very difficult, so the testing for the vehicle curving performance is conducted on the real curve track. And it is desirable to test on the full scale test rig, but it caused many problems relating to test costs, test time. To overcome these problems, the small scale test rig is actively used in the field of bogie stability. Thus, in this paper, we have studied the scale track to test the bogie steering performance. For this, we designed the 1/5 scale test track equivalent to radius 200 curve and confirmed the validity of the testing for the bogie steering performance on the scale curve track through the testing using 1/5 scale bogie.

관절대차형식 철도차량 곡선구간 주행 시 곡률 추정방법

허현무(Hyun Moo Hur),안다훈(Da Hoon Ahn),신유정(Yu Jeong Shin) 대한기계학회 2017 大韓機械學會論文集A Vol.41 No.12

관절대차형식 철도차량 곡선구간 주행 시 곡률을 효율적으로 추정하기 위하여 관절대차형식 철도차량의 곡선구간 주행 시의 기하학적 거동을 고려한 곡률 추정방법을 제안하였다. 본 곡률 추정방법의 타당성을 검토하기 위하여 곡선주행 곡률 추정해석을 수행하여 이론적 타당성을 검증하였다. 그리고 실차량을 대상으로 한 실선로 검증시험을 통한 곡률 분석결과, 궤도검측데이터 상의 곡률과 비교한 오차는 평균 0.92%로서 궤도검측데이터 상의 곡률에 매우 근사한 결과를 나타냈다. 따라서 제안한 관절대차 형식 철도차량에 대한 곡률 추정방법은 곡선구간 검지가 필요한 철도차량 개발 및 시험평가 분야 등에서 매우 실용적인 곡률 추정방법으로 폭 넓게 활용될 것으로 기대한다. To estimate the curvature of an articulated railway vehicle, this study proposed a curvature estimation method that considers the geometric behavior of articulated railway vehicles running across curved sections. To examine and verify the theoretical validity of the proposed curvature estimation method, a curvature estimation analysis was performed. As a result of on-track test using the articulated railway vehicle, the error compared to the curvature of track measuring data is 0.92%, which is very close to the curvature of the track measuring data. Therefore, it is expected that the proposed curvature estimation method for articulated railway vehicles will be widely used as a practical curvature estimation method during railway vehicle development as well as to testevaluation fields requiring curve detection.

곡률반경 추정방법을 이용한 철도차량 능동조향제어 전략

허현무(Hyun Moo Hur),유원희(Won Hee You),박준혁(Joon Hyuk Park),김민수(Min Sooe Kim),김남포(Nam Po Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.6