• Journal of the Korean Society for Railway
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• v.8 no.4
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• pp.321-329
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• 2005

This paper has established the strength evaluation procedure of the bogie frame for the Korean tilting train that is being developed in KRRI, In order to establish the strength evaluation procedure, firstly, the loading conditions imposed on the tilting train were investigated. In addition, the static and fatigue strength of the bogie frame has been evaluated. In order to derive the dynamic loads according to the carbody tilting, the load redistribution effect by carbody tilting, the unbalanced lateral acceleration effect by high-speed curving and the tilting actuator force effect have been considered. Multi-body dynamic analyses have been carried out to evaluate the tilting load cases and the strength analysis has been performed by finite element analyses. From this study, the structural safety of the bogie frame could be ensured.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.30 no.1 s.244
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• pp.97-104
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• 2006

This paper has investigated the strength of the bogie frame for the Korean tilting train that is being developed in KRRI. In this study, the loading conditions imposed on the bogie frame of tilting train were derived and the static and fatigue strength of the bogie frame has been evaluated. In order to achieve these goals, finite element analysis has been performed and the stress concentration areas were investigated. Based on the analytical results, the static load tests were conducted under the nontilting load conditions and the tilting load conditions. The test results were used to evaluate the fatigue strength of the bogie frame by Goodman diagram.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.589-594
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• 2004

This paper has evaluated the fatigue strength of a tilting bogie frame for the Korean tilting train. We have established the loading combinations for the tilting bogie frame based on the UIC standard because there are no standards for the tilting train. For this study, we have derived 31 load cases to consider tilting effect. Then, we have performed the static and fatigue analysis. From this study, we can make sure the safety of the tilting bogie.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.130-135
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• 2004

The fatigue strength analysis is performed for the bogie frame of Korean tilting train which is newly developed. The loading conditions imposed on the bogie frame during carbody tilting are derived in addition to the loadings based on the JIS E4207 standard. The tilting bogie frame is modeled for the finite element analysis and fatigue analysis is carried out under Goodman equation. It is concluded the bogie frame of the developed tilting train has enough structural safety.

• Proceedings of the KSR Conference
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• 2004.06a
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• pp.744-747
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• 2004

This paper presents a strength evaluation of a tilling bogie frame for the Korean tilting train, The tilting bogies of the tilting train are subjected to different loading conditions compared with the bogie of the conventional railway vehicles because of the carboloy tilting on curves. We classified the load cases as two categories such as non-tilting case and tilting case. For the two categories. we have carried out structural analysis of the bogie frame to evaluate the strength of the frame. And then, we modified the shape and thickness for the weak areas of the bogie frame to ensure structural safety.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.1 s.178
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• pp.166-173
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• 2006

This paper investigated strength of a bogie frame for Korean tilting train that is being developed in KRRI. In this study, static load tests based on Japanese Industrial Standard (JIS) were performed. In order to simulate vertical and lateral components generated by tilting link mechanism, four hydraulic actuators were used. The eight load cases such as vertical, lateral, traction, braking and driving gear loads were applied for evaluation of the strength of bogie frame. The stresses measured at the stress concentration points were assessed using Goodman diagram. From the experimental results, structural safety of the bogie frame could be ensured.

• Journal of the Korean Society for Railway
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• v.8 no.5
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• pp.419-424
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• 2005

This paper has performed fatigue and nondestructive test of bogie frame for Korean tilting train. Before the fatigue test, static tests were carried out. From the test, the structural safety was investigated using Goodman diagram. After the static test, the fatigue test were conducted under tilting load conditions. The fatigue test was conducted for $10{\times}10^6$ cycles. During the fatigue test, the nondestructive tests using magnetic particle and liquid penetrant were performed at $6{\times}10^6$ cycle and $10{\times}10^6$cycle. From the crack detection tests, it was known that there was no fatigue crack in the bogie frame.

• Proceedings of the KSR Conference
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• 2003.10c
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• pp.42-48
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• 2003

Korea Railroad Research Institute(KRRI) have been developing Korean Tilting Train eXpress(TTX) with the service speed of 180km/h as the R&D project supporting by Korea government. The core of research is the development of the tilting bogie using the domestic tilting technologies. We developed the 3D-CAD prototype of tiling bogie model. In this paper we attempted to evaluate the structural strength of bogie frame using the Finite Element Method. Finally, we . would like to propose the application of the modifying part to the detail design.

• Proceedings of the KSME Conference
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• 2004.11a
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• pp.887-892
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• 2004

On curved rail, the speed of train must be reduced in order to keep riding comfort. So, the train has the speed limitation in conventional railway line. But if the train has the tilting mechanism, the speed of train is able to be increased while maintaining the riding comfort. Generally, the tilting train is faster than the non-tilting train about 30% in curve. The tilting train technology and reduction of travel time has been carefully investigated by KRRI (Korea Railroad Research Institute). Based on the primary research result from KRRI, tilting control system and tilting operation interlace are considered its core technology to apply tilting train to Korean conventional railway. In this paper application of non-tilting pantograph to tilting system will be introduced. New type of bogie frame and system modification of vehicle are invented to apply non-tilting pantograph to tilting train.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.435-442
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• 2004

Tilting train allow the train to pass curve at higher speed without affecting passenger comfort. As the tilting trains run curve track about 30$\%$ higher than non-tilting trains, the centrifugal force and dynamic force will be higher. Therefore it is very important for tilting train to ensure safety against derailment, and to reduce the lateral track forces by applying light-weight design, optimized suspension design and steering mechanism. The 180 km/h Korean Tilting Train(TTX) which is now developing as a part of the Korean National R & D project, was designed and analytically verified to meet these special requirements. This paper describes the analytic study to verify the safety against derailment, especially on the wheel unloading in case of tilting actuation. The severest curve geometry and curving speed was assumed, the tilting control pattern was also assumed as trapezoidal force function applied to tilting bolster and bogie frame. For the comparison, the operation with the speed of tilting train without tilting actuation was numerically simulated and the operation with the balanced speed without tilting actuation was also numerically simulated. Through the numerical simulation of various operating case, we found that derailment quotients, wheel unloading and Q/P was not affected by tilting actuation and that the bogie of TTX was nicely designed to satisfy the safety against the derailment.