• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2013.05a
• /
• pp.1567-1568
• /
• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.1559-1560
• /
• 2011

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.1569-1570
• /
• 2011

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.1541-1542
• /
• 2011

• Proceedings of the KSR Conference
• /
• 2011.05a
• /
• pp.413-422
• /
• 2011

A battery is an important part of the component, as a power source of the control of rolling stock at starting movement or emergency control. Now widely used batteries are Ni-Cd batteries and lead accumulators, and these are increasingly getting smaller and lighter. In addition, the electric capacity required is increasing, due to the development of electronic control technology of rolling stock. Therefore, various kinds of high-efficiency battery are considered for the new routes' rolling stock, but rolling stock's batteries should be fully tested to prove safety and also have no difficulty in terms of management, so because of the requirement, it is difficult to be in practical application. In this paper, we will survey cases of applying battery to rolling stock and then we will review whether there is any problem about safety and performance, management to discuss future trend of batteries.

• Applied Chemistry for Engineering
• /
• v.30 no.3
• /
• pp.384-388
• /
• 2019

In winter season, the snow and ice accretion on the bottom of the high speed railway rolling stock and boogie part has fallen at a high speed from the ballast section (gravel section for the transmission of the rolling stock load received by sleepers and fixing sleepers), causing the gravel to be scattered, thereby damaging the railway rolling stock structures and facilities. In order to solve these problems, the gravel scattering prevention net, manual de-icing, and movable hot air machine were used, but their efficiency was low. For the more efficient de-icing than ever before, an optimum material for de-icing fluid for high speed railway rolling stock was developed by evaluating the ice melting capacity, kinematic viscosity, evaporation of the material used as a chemical de-icing fluid. Four kinds of organic acid salts (sodium formate, sodium acetate, potassium formate and potassium acetate) and two different alcohols (propylene glycol, glycerol) were used as evaluation materials. Potassium formate, potassium acetate, and propylene glycol had similar ice melting capacities in the indoor test, but the propylene glycol showed the best ice melting capacity in spraying the system simulation test. This is because the kinematic viscosity of propylene glycol was 2.989029 St, which is higher than those of other materials therefore, it could stay longer on the ice and de-icing. In addition, potassium formate and potassium acetate were difficult to be used since the crystals precipitated and adversely affected the appearance of the rolling stock. The propylene glycol is the most optimum as an de-icing fluid for the high speed railway rolling stock.

• Journal of the Korean Society of Systems Engineering
• /
• v.4 no.1
• /
• pp.31-34
• /
• 2008

As a supply contract for 100 new high-speed rolling stocks(KTX-II) was made 8th June 2006, System Engineering process has been applied to introduce the high-speed rolling stocks successfully and to manage the total life cycle systematically from Pre-concept Phase, Contract Phase, Preliminary and Critical Design Review, Production, Test and Verification, Acceptance and Operation to assurance for a flaw.

• Proceedings of the KSR Conference
• /
• 1998.11a
• /
• pp.489-496
• /
• 1998

Although the surface of aluminum alloy has good corrosion resistance property, the surface of the aluminum rolling stock should be painted for good appearance and protection of the body. For better painting of the aluminum carbody, the surface must also be well pretreated. In this paper, painting process of the aluminum rolling stock is described and the test results of the painted surface is presented. As accumulated data concerning to the painting technology for the aluminum rolling stocks are absent in our country, the presented test results will be helpful for mass production of aluminum rolling stocks in the near future.

• Journal of the Korean Society for Railway
• /
• v.11 no.3
• /
• pp.233-239
• /
• 2008

It is very important to set a reliability target and verify the requirement when procuring the rolling stock in the aspect of safety, availability and LCC. While there are a few different methods to verify the reliability target, it is required that the most appropriate method should be used considering the characteristics of rolling stock itself and the operation environment. Even though recently the quantitative reliability requirements are widely adopted in domestic market, there is no substantial contents in the various standards and guidelines. In this study we investigate the various reliability demonstration test plans and evaluate them for rolling stock application. And three test plans among them were applied to the real operation data.

• Journal of the Korea Society for Simulation
• /
• v.18 no.3
• /
• pp.23-34
• /
• 2009

In the railroad rolling stock depot, long-term maintenance tasks is done regularly every two or four year basis to maintain the functionality of equipments and rolling stock body or for the repair operation of the heavily damaged rolling stocks by fatal accidents. This paper addresses the computer simulation model building for the rolling stock maintenance shop for the CDC(Commuter Diesel Car) and Generator Car planned to be constructed at Daejon Rolling Stock Depot, which will be moved from Yongsan Rolling Stock Depot. We evaluated the processing capacity of two layout design alternatives based on the maintenance process chart through the developed simulation models. The performance measures are the number of processed cars per year, the cycle time, shop utilization, work in process and the average number waiting car for input. The simulation result shows that one design alternative outperforms another design alternative in every aspect and superior design alternative can process total 340 number of trains per year 15% more than the proposed target within the current average cycle time.