• Proceedings of the KSR Conference
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• 2003.10b
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• pp.197-202
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• 2003

A Railroad Cars playa prominent role in a matter of transportation yet it cannot be discussed here for cultural space. On the other hand, considering railroad customers' increaced desire(craving) for cultural space, we design it in the train so that we provide customers not only transportation but also fullfil them desire for culture. In the competitive cultural era. The aim of the new strategy for railroad bussiness is both inspiving art and operating exhibition facilities in the train(railroad). Through analysis of exhibition space and environment, we design exhibition space to equip cultural facilities in the train then lead to make railroad business' new social education role by the inside and outside of the country.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2002.11a
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• pp.339.1-339
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• 2002

Noise of the VVVF inverter and DC/DC converter, which are the most dominant noise sources of maglev train at low speed, is studied. The coils inside inverter and converter are excited by the electro-magnetic forces, which results in core vibration and generations of the noise. It is found that the spectra of the noise show many harmonics, where there exist several different fundamental frequencies. (omitted)

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2011.04a
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• pp.351-356
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• 2011

Some materials show the character of rigid body in low frequency spectrum. The rigid body motions are consisted of translational and rotational motions. Especially, we can get the acceleration or displacement of a random point in the rigid body by analyzing rigid body transfer matrix at the car's engine and power train. Actually it is difficult to measure the acceleration by attaching the sensor inside of the engine and power train. So the hard to predict acceleration data can be achieved attaching the sensor on the outside of the engine and power train by analyzing the data of rigid body motion which the engine is operated using dynamo. Also this paper will show the change of predicted data and accuracy variation by not using all the measured data but a few exceptions of the point number.

• Transactions of the Korean Society of Automotive Engineers
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• v.17 no.3
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• pp.29-34
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• 2009

Diesel particulate filter (DPF) has been developed to optimize engine out emission, especially particulate matter (PM). One of the main important factors for developing the DPF is estimation of soot mass being accumulated inside the DPF. Evaluation of pressure drop over the DPF is a simple way to estimate the accumulated soot mass but its accuracy is known to be limited to certain vehicle operating conditions. The method to compensate drawback is adoption of integrating time history of the engine out PM and burning soot. Present study demonstrates current status of the soot estimation methods including the results from the engine test benches and vehicles.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1078-1082
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• 2009

Airport express line between InCheon international airport and KimPo has been started in April 2007. It has two kinds of train that are divided into commuter train and express. In this paper, we analysis the experimental results of the interior noise for both trains, as inside structure and materials of these trains are designed differently. It shows that the interior noise level of commuter train is higher about 10 dB(A) than express in open territory, and it in tunnel and viaduct increase by 7$\sim$12dB(A) compared with open territory. Also, we know that the door in the gangway is effective in protecting the rolling noise transmitted between carbodys from the outside.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.655-659
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• 2005

The environment. of electric railway has, included both fast and slow load variation, which may occur in the office or maintenance factory or running electric train. This paper investigated flicker indices according to voltage fluctuations on three different situations; The base office in new subway in the daytime and night time, inside of electric train running in conventional subway. And also the variations of harmonic frequencies(2nd, 3rd, 5th) with rime were measured at the same time. Flicker index is a good tool for evaluating the voltage fluctuation quantitatively and show some relationship with even harmonic frequencies produced by the voltage fluctuation when the electric train is running on the railway.

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.563-575
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• 2000

This study was carried out about the system engineering, the design, and Mock-up for the development of passenger car of Korean High Speed Train of maximum operating speed of 350km/h. The design was studied to carbody section ＆ lay out, ring, fitting, carbody, electrical system based on Korean-TGV. The design of aluminium alloy carbody which was enabled to reduce the weight of carbody structure and was studied with construction of air-tightness. Air pressure controlled system provided to comfort passenger due to a reduction of difference pressure between inside and outside of passenger room on running of the tunnel. The Interior design was performed in order to satisfy high speed and comfort to study by the modern design. The electrical system was designed two parts of logic and network for high reliability of train.

• Journal of the Korean Society for Railway
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• v.7 no.3
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• pp.278-282
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• 2004

A Railroad Cars playa prominent role in a matter of transportation however, yet it cannot be discussed here for cultural space. On the other hand, considering railroad customers' increaced desire(craving) for cultural space, we design it in the train so that we provide customers not only transportation but also fullfil them desire for culture. In the competitive cultural era. The aim of the new strategy for railroad business is both inspiving art and operating exhibition facilities in the train(railroad). Through analysis of exhibition space and environment, we design exhibition space to equip cultural facilities in the train then lead to make railroad business' new social education role by the inside and outside of the country.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1259-1263
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• 2006

The inter-coach spacing is one of the most important sources of the aero-acoustic noise of a high-speed train. When fluid at high speed flows over an open cavity, such as the inter-coach spacing, large acoustic pressure fields inside the cavity are produced by fluid/structure interactions at the downstream end of the cavity. In this study experiments were performed to investigate the characteristics the aero-acoustic noise generation from the inter-coach spacing of a high-speed train. Results of the measurement confirmed that the noise generated from the gap between mud-flaps are strongly dependent on the size of the gap.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.1093-1098
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• 2001

The interior sound pressure level of the Korean high speed train is predicted using ray acoustic method. The motor car, motorized car and passenger cabin are investigated under the environment of passing open countryside and inside tunnel Calculated sound levels of KHST are compared with the those of KTX prototype which vehicle shows similar acoustic behavior with KHST for the purpose of assuring the calculated data. In order to reduce the calculated SPL in systematic way, contribution analysis of sound sources and sensitivity analysis of concerning wall's transmission loss on the SPL of the designated receiving points are carried out. Finally, practical design suggestions are proposed.