• 국제초고층학회논문집
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• 제11권3호
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• pp.207-219
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• 2022

During the structural design of urban over-track high-rise buildings, two problems are most likely encountered: the abrupt change of story stiffness between the podium and the upper towers, as well as the demand for train-induced vibration control. Traditional earthquake-resistant structures have to be particularly designed with transfer stories to meet the requirement of seismic control under earthquakes, and thus horizontal seismic isolation techniques are recommended to solve the transfer problem. The function of mitigating the vertical subway-induced vibration can be integrated into the isolation system including thick rubber bearings and 3D composite vibration control devices. Engineering project cases are presented in this paper for a more comprehensive understanding of the engineering practice and research frontiers of urban over-track high-rise buildings in China.

• 한국철도학회논문집
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• 제15권5호
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• pp.485-497
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• 2012

최근 철도의 소음, 진동에 대한 사회적 관심이 증가하면서, 철도 진동을 효과적으로 줄일 수 있는 플로팅 슬래브 궤도의 적용이 활발히 이루어 지고 있다. 본 연구에서는 플로팅 슬래브 궤도의 동적 거동을 보다 정확히 이해하기 위하여 실모형 실내 실험을 통해 정적 거동과 시스템 고유 진동수 부근의 저주파 대역에서 플로팅 슬래브 궤도의 동적 거동을 분석함으로써 플로팅 슬래브 궤도의 설계의 적정성과 설계에 적용되는 해석모델의 유효성을 입증하고자 하였다. 실험 및 유한요소 해석 결과에 따르면 플로팅 슬래브 궤도는 강체 모드 고유진동수보다 휨모드 고유 진동수에 가까운 대역에서 탁월 주파수가 나타나며 변형 형상도 휨모드가 가장 지배적인 모드가 되므로, 플로팅 슬래브 궤도의 설계 시에는 슬래브의 휨강성과 조인트 및 단부의 경계조건 등을 고려해야 한다. 또한 Kelvin-Voigt 모델을 사용한 2차원 유한요소 해석모델에 의한 해석 결과는 정적 및 동적 처짐, 하중 전달율 등 실험결과와 매우 잘 일치하는 것으로 나타나 플로팅 슬래브 궤도의 설계에 활용하기에 충분한 신뢰성을 가지고 있는 것으로 나타났다.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.1196-1201
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• 1993

Test of Caterpillar Challenger 65 tractor which has rubber tracks, and articulated four wheel drive tractor with dual wheels and a mechanical front wheel drive tractor were conducted on an unplowed and plouwed wheat stubble field. The following parameters were analyzed : tractive efficiency (ηv), net tractive coefficient ($\phi$n), slip ($\sigma$) , drawbar pull(Fv), drawbar power (Pv) and forward velocity(v). The maximum net tractive coefficient was established at the tractive efficiency of 0.60 on the unplowed wheat stubble field : for the Challenger 65 tractor 0.855 ; 4WD 0.624 and MFWD 0.534 and on the plowed wheat stubble field with the tractive efficiency of 0.40 for the Challenger 65 tractor 0.82 : 4WD 0.57 and for tractor MFWD 0.48.

• 한국소음진동공학회논문집
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• 제23권2호
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• pp.112-122
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• 2013

Recently the construction of stations under railway lines and railway sections passing through central area of cities are increasing, calling for an urgent establishment of countermeasures against railway vibration and its subsequent second-phase noise. Of technology developed up to now, the most efficient countermeasure is the floating slab track, a track system isolated from the sub-structure by springs. Unfortunately, however, the system design technology and technology for key components have not yet developed in Korea. As such, in this study, the analysis and design technology of floating slab track and its vibration isolator technology can be achieved. In preparation for future demands, it is expected to raise awareness for the need of technology self-support and to make a meaningful contribution to mitigating vibration and noise produced by the next-generation high-speed railway.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2013년도 춘계학술대회 논문집
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• pp.636-641
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• 2013

Recently the construction of stations under railway lines and railway sections passing through central area of cities are increasing, calling for an urgent establishment of countermeasures against railway vibration and its subsequent second-phase noise. Of technology developed up to now, the most efficient countermeasure is the floating slab track, a track system isolated from the sub-structure by springs. Unfortunately, however, the system design technology and technology for key components have not yet developed in Korea. As such, in this study, the analysis and design technology of floating slab track and its vibration isolator technology can be achieved. In preparation for future demands, it is expected to raise awareness for the need of technology self-support and to make a meaningful contribution to mitigating vibration and noise produced by the next-generation high-speed railway.

• 문화기술의 융합
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• 제5권2호
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• pp.355-360
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• 2019

본 연구에서는 고속열차 주행 중 발생하는 풍하중 안정성 검토조건을 준용하여, 열차속도 300km/h와 360km/h에 대한 고속선로용 고무보판 패널 구조의 열차 풍하중에 대한 구조적 안정성을 검토하였다. 이를 위해 고무보판 패널 시스템이 가장 복잡한 구성으로 설치될 수 있는 현장조건을 적용하여 3차원 해석모델링을 이용한 정밀 수치해석을 수행하였으며, 이를 통해 고속열차 풍하중에 대한 고무보판 패널 시스템의 구조적 안정성을 해석적으로 입증하였다.

• 한국철도학회논문집
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• 제20권3호
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• pp.320-328
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• 2017

철도차량에 폭 넓게 적용되고 있는 축상고무스프링의 노화에 따른 탈선안전도 영향을 분석하고자 노화 축상고무스프링 시료를 대상으로 특성시험을 수행하였다. 그리고 축상고무스프링 노화가 탈선 안전에 미치는 영향을 분석하기 위하여 주행 동특성 해석을 수행하였다. 사용연수 17년이 지난 롤고무 축상스프링 시료를 대상으로 한 상하방향 특성시험결과, 고무 노화로 인하여 변위 복원기능이 저하되었고 스프링강성이 현저히 증가하였다. 그리고 EN14363규격 적용 twist궤도 주행 시를 모사한 주행동특성 해석결과, 정상 차량모델(Case1)에 비하여 노화 축상스프링 특성을 적용한 차량모델(Case2)의 탈선계수와 윤중감소가 증가하여 탈선안전도는 저하하였다. 특히 급격한 선형 변동이 발생하는 천이구간 주행 시 윤중감소로 인한 탈선안전도는 취약하게 나타났다.

• The Journal of the Acoustical Society of Korea
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• 제21권1E호
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• pp.42-48
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• 2002

In this paper, a computer simulation method is presented far the dynamic analysis of a hydraulic engine mount system. The hydraulic engine mount system controls the damping characteristics using the viscosity of fluid flow. The complex stiffnesses of the main rubber for the hydraulic engine mount system are computed using a finite element analysis. The equations of motion considering the parameters of the hydraulic engine mount system are derived. To investigate the effects of the hydraulic engine mount system, the computer simulation running over a typical rough road is carried out using a vehicle dynamic model. These results are compared with those of the conventional rubber mount system.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.964-967
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• 2006

Korea Railroad Research Institute (the following 'KRRI') built AGT test line in Gyeong San-city, Kyongsang-bukdo province, Korea on August, 2004. This test line is exclusively used for the test of the driverless rubber-tired AGT system, and applied with research result of AGT System Development Project like vehicles, power supply, control and signaling, track and infrastructure system. The test line is available for the test of rubber tired AGT system's performance, function, safety. In this paper, we described the operation system of test line for the test of performance, safety, reliability, and also system operation in emergency. Finally we present the operation result of test line.

• 한국재료학회지
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• 제17권11호
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• pp.601-605
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• 2007

The tribological properties of acrylonitrile-butadiene rubber (NBR) filled with two kinds of carbon black filler were examined. Different types of Semi-Reinforcing Furnace (SRF), and High Abrasion Furnace (HAF) blacks were used as filler material to test the influence of carbon black particle size on the friction and wear of NBR. Results from tribological tests using a ball on disk method showed that the smaller HAF particles were more effective for reducing the wear of NBR during frictional sliding. The hardness, elastic modulus at 100% elongation, and elongation at break were measured to examine the correlation between the effects of carbon black on the mechanical and tribological properties of the NBR specimens. The wear tracks of the NBR specimens were observed with scanning electron microscopy (SEM). The wear tracks for NBR with different ratios of SRF and HAF showed clearly different abrasion patterns. Mechanisms for the friction and wear behavior of NBR with different sizes of carbon black filler were proposed using evidence from wear track observation, as well as the mechanical and tribological test results.