• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.1549-1557
• /
• 2010

Multi-purpose freight car is very useful to overcome the unbalance between freight demand and freight car supply. it means removable container is the auxiliary device to make flat car and container and it will be able to transport the container and flat freight. The study is analyzed the freight car operation frequency and freight volume and researched the efficient operation plan. The multi-purpose freight car will contribute in improved the seasonal and the item demand fluctuation and solved the problem of decrease utilization of the open freight car.

• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.1533-1541
• /
• 2010

Multi-purpose freight car is applicable for both bulk freight and containerized freight to cope with the unbalance between demand and supply due to the demand variation by seasons or directions. In this paper, we suggested the advantages of introducing attachable container to railway freight transportation and possible freight items to use multi-purpose freight car. This results can be used to analyse the amount of attachable container and the feasibility of introducing multi-purpose freight car to railway.

• Proceedings of the KSR Conference
• /
• 2003.10c
• /
• pp.109-113
• /
• 2003

Recently, freight cars for diverse purposes were developed to increase the speed of freight car in conventional line. The welded type bogies are applied to these vehicles like container car, gondola car, hopper car, etc. This study was focused on the dynamic characteristics and the stability of freight car to guarantee the running safety. We have conducted the running tests of freight cars in conventional line and described the test results in this paper.

• Proceedings of the KSR Conference
• /
• 2001.05a
• /
• pp.217-221
• /
• 2001

Barber bogie and Y25 bogie is the main bogie of freight car which is used in the Korean railway. In case of Barber bogie and a mixed formation tile maximum speed limit of empty car is 70 km/h and that of loaded car is 90 km/t and also it runs a speed of 110 km/h in time of an exclusive formation of Y25 bogie. The car named as high speed freight car at present is Y25 bogie which modeled on the Y25 bogie or Europe developed in 1993, Y25 bogie has no problem about the running capacity up to the speed of 110 km/h, but it works as limiting factors to tile increasing cost of maintenance and repair expenses which caused by repair of bogie and the cost of materials. This study is going to describe the contents examined by analysis and tests, aimed at being used as an index of plan in the future through the strength test of high speed freight car which is used now.

• Proceedings of the KSR Conference
• /
• 2001.05a
• /
• pp.212-216
• /
• 2001

Recently, it has been trending toward speed-up not only in the passenger car but in the freight cu. In this study, we thus performed stress analysis for the carbody for high speed container freight car in use and field test of the freight car in Gyungbu-line so that we may utilize the results as a design guide for speed-up hereafter- Five vertical loading conditions due to dynamic effect and the weight of the carbody and the container applied to locking devices of the carbody and its results are compared with that of a test, As a result, we found that there is need to complement the strength of the carbody in some measure when speed up the present freight car.

• Journal of the Korean Society for Railway
• /
• v.6 no.3
• /
• pp.149-155
• /
• 2003

The development of railway vehicles involves the proper selection of design parameters not only to achieve high speed but also to reduce the vibration of the train. In this study an analytical model of a freight car is developed to find the critical speed. The freight car can generate the snake motion of the lateral and yawing motion of the car body, the bogie, and the wheelset. Numerical analysis for the nonlinear equation motions with 17 degrees of freedom showed the running stability and critical speed due to the snake motion. Also, the vibration modes of the freight car was calculated using ADAMS/RAIL, which showed that the critical speed have the yawing modes of the car body and the bogie. Finally this paper shows that the snake motion of the vehicle can be controlled with the modifications of the design parameters.

• Proceedings of the KSME Conference
• /
• 2001.06b
• /
• pp.507-512
• /
• 2001

As needs for substitution of excessive road-oriented transport by the railroad increase, we proposed the guideline for development of the high speed freight car up to 150km/h through analyzing the critical speed of welded-type freight car employed and investigating the improvement in its maintenance. This study, the proper design parameters of conical rubber spring was determined to meet the vibration performance.

• Proceedings of the KSR Conference
• /
• 2002.05a
• /
• pp.234-241
• /
• 2002

In this study, a numerical method which assesses running stability of freight car loading 300m CWR and structural safety of conventional railway track when passing over curves and steel girder bridges is presented. Optimal speed of the freight car is suggest on the basis of numerical reviews for stability of derailment of the freight car and structural safety of track at weak points of the conventional line.

• Proceedings of the KSR Conference
• /
• 2008.11b
• /
• pp.1642-1645
• /
• 2008

It is said that the effect in wheels of freight car varies with the type of freight, the condition of operation, the braking device, and the type of bogie. The hardness of open wagon, gondola car, propylene car, covered freight car, container car and hopper car has been measured according to the mileage through this research. As a result, the wheel with more mileages after shaving off the wheel tread has a higher hardness than the others in the case of same type of car.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.10 no.6
• /
• pp.194-201
• /
• 2002

In this study is presented a numerical method which assesses running safety of the freight car loading with loom CWR and structural safety of conventional railway track and fastening when passing over sharp curves and steel girder bridges. Optimal speed of the freight car is suggested based on the numerical reviews of the safety against derailment of the freight car and structural safety of track and fastening at vulnerable points of the conventional line.