• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1996.10a
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• pp.408-413
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• 1996

도시화가 빠른 속도로 진행되고 있는 우리나라에서도 철도에 대한 수송능력의 증대, 고속화등의 사회적 요구에 의하여 철도선로의 고가화가 충분히 예상된다. 그러나 소음문제를 생각할 경우, 고가선로에 있어서는 다른 선로와 달리 열차주행에 의한 전동음(rolling noise)과 더불어 주행열차에 의하여 가진된 고가구조체의 진동소음(이하 고가 구조물음)을 함께 고려하지 않으면 안된다. 따라서 본 논문에서는, 고가철도에서의 소음전파를 예측하기 위하여, 고가구조체로부터의 소음방사를 고려하는 실험적 검토를 하였다. 또한 실험결과를 근거로 하여 고가 구조 물음에 대한 음원모델을 설정하고, 전동음을 포함하는 소음전파 예측의 계산모델을 작성하여, 계산결과와 실측결과와의 대응성에 대하여 검토하였다.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.6-12
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• 2010

The source of wayside noise for the train are the aerodynamic noise, wheel/rail noise, and power unit noise. The major source of railway noise is the wheel/rail noise caused by the interaction between the wheels and rails. The Structure borne noise is mainly a low frequency problem. The train noise and vibration nearby the elevated railway make one specific issue. The microphone array method is used to search sound radiation characteristics of elevated structure to predict the noise propagation from an elevated railway. In this paper, the train noise and structure borne noise by train are measured. From the results, we investigated the effect on the sound absorption tunnel for elevated railway.

• Journal of the Korean Society for Railway
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• v.14 no.2
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• pp.87-93
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• 2011

This work describes an availability model of highly available systems to achieve Five-9's availability. Modern railway systems have raised users' expectations of powerful "always on" services. The crucial characteristics of these highly available services are essential to many modern businesses area, such as telecommunications, railway systems, information operations, Web-based businesses, and so on. The architecture-based model of system availability is useful to assess the feasibility of meeting a high availability target. The Markov model approach is straightforward for relative system engineers to adapt when they model highly available system failure and the failure recovery process. This work proposed the improved availability model through UML2.0. It is shown that the architecture-based model of system availability is a good reasonable by its application of the railway systems.

• Railway Journal
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• v.19 no.1
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• pp.46-53
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• 2016

• Journal of the Korean Society for Railway
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• v.17 no.2
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• pp.133-139
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• 2014

Due to the absence of design guidelines for elevated light-rail structures in Korea, most elevated light-rail structures have been designed and constructed based on the design codes of conventional railway bridges and on the codes recommended by foreign vehicle manufacturers. This is the main reason why most elevated light-rail structures are massive or over-designed or poorly constructed economically. In this paper, the authors carried out field tests to analyze the braking forces caused by braking a train running at speeds of 50km/h, 60km/h, and 70km/h, acting on the elevated structures of rubber-wheeled Light Rail Transit (LRT) trains. The authors also briefly describe the analyzed results of the braking force acting on the substructures of elevated light-rail structures. The test-results presented here in this paper can be referenced when establishing design guidelines or standards for elevated structures of LRT systems.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1997.10a
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• pp.302-307
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• 1997

철도는 평탄부, 고가부 및 성토부.절토부 등의 다양한 지형구조에 걸쳐서 뻗어 있으며, 지금까지는 평탄부와 고가부를 대상으로 하여 철도소음의 전파예측에 대한 검토를 해왔다. 본 연구에서는 유한 임피던스의 흡음성 Wedge 구조를 갖는 성토부 선로의 주행열차를 대상으로 소음전파 예측모델의 작성 및 소음전파 측정을 통하여 성토 선로구조에서의 철도소음 전파예측에 대하여 검토하였다.

• Journal of KSNVE
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• v.8 no.2
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• pp.289-296
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• 1998

To predict the noise propagation from an elevated railway, sound radiation characteristics of elevated structure are measured by using the sound intensity method. In the base of the results, we propose the source model of elevated structure noise and the calculation model for elevated railway noise. Acoustic model of the former is modeled a row of single sources with directivity cos .theta. positioned in the center of a bogie and arranged in the lower side of slabs. Also prediction model is presented with rolling noise and elevated structure noise calculated by considering the power level of a source for one-third octave band, ground absorption and barrier deflection. Noise level unit patterns of a passing train is calculated based on this model and the results are compared with available field data.

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.239-245
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• 2006

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.376-381
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• 2005

This paper presents the rail structure interaction analysis of the elevated viaducts which contains the curved alignments with smallest radius of 300 metre. The aim of this study is to check the compatibility between the track and the curved structure in order to verify the safety of the continuous welded rail track under service conditions. To perform the rail structure interaction analysis, nonlinear static rail structure interaction calculation is implemented. The bridge structures, the rails and the track behaviour are modelled according to the UIC774-3 and the Eurocode prEN1991-2 recommendations. Criteria in Eurocode prEN1991-2 are investigated to check the compatibility between the track and the structure for the rail structure interaction effects.

• Disaster and Security
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• v.5 no.1
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• pp.54-61
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• 2015