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RISS 인기검색어
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- 저자 : 안다훈(Da Hoon Ahn) (검색결과 5 건)
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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
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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.
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허현무(Hyun Moo Hur),안다훈(Da Hoon Ahn),김남포(Nam Po Kim),심경석(Kyung Seok Sim),박태원(Tae Won Park) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.9
Lateral force of wheel is important parameter when we evaluate the safety of a railway vehicle on curved track. The lateral force of wheel is influenced by the steering performance of wheelsets. Generally, in passive type vehicles, the steering performance of wheelsets is influenced by the parameters like primary spring stiffness, wheel base, conicity of the wheel profile, etc. But, the steering performance of passive type vehicle has its limit. To overcome the limit of the steering performance of passive type vehicle, active steering technology is being developed. In this paper, we analyze the lateral force of wheel and the safety of the railway vehicle on curved track by adopting the active steering technology. As results of dynamic analysis for vehicle model equipped with active steering system, the lateral force of wheel is reduced and the safety is improved remarkably.
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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
In this paper, we studied the steering performance of wheelset with primary suspension characteristics of railway vehicle. We carry out dynamic analysis and experimental study for the vehicle models which are different primary suspension characteristics. The steering angle of a vehicle model (Case 1) operating in domestic subway lines is insufficient compared with an objective steering angle for curved track. And the steering angle of a vehicle model (Case 2) with improved self-steering performance of wheelset is a little improved compare to previous vehicle model. But also Case 2 model is still insufficient compared with an objective steering angle and has its limit in steering performance. So to overcome this limit of steering performance of passive type railway vehicle, an active steering technology is being developed. In case of vehicle model with active steering system, the steering performance is improved remarkably compared to passive type vehicle model.
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