• Journal of the Korean Society for Railway
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• v.10 no.4
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• pp.405-408
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• 2007

In this paper, we describe the analysis of interior noise for tilting train that is being developed in Korea. Tilting train is made of composite material to reduce the car body's weight and attached a self-steering system on bogie to improve curving performance. However, the acoustic performance (Transmission Loss) of such material is worse than the materials of conventional train, such as aluminum, steel and so on. Therefore, we measure the transmission loss of side wall/floor of tiling train and predict the interior noise for tilting train using its measuring results.

• Journal of the Korean Society for Railway
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• v.10 no.1 s.38
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• pp.39-44
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• 2007

This rafer explains a durability test of a large train car body made of carbon/epoxy composite material. The composite car body with the length of 23m was manufactured as a sandwich structure composed of an aluminum honeycomb core and CF1263 woven fabric carbon/epoxy faces. In order to evaluate durability of the composite car body, it was excited by two 500kN capacity hydraulic actuators installed underneath the body bolster. The natural frequency of the composite car body under full weight condition was found to be 4.33Hz. Based on this result, the excitation frequency and displacement of 5Hz and ${\pm}1.0mm$, respectively, were used as inputs for the durability test. The test was conducted for $2{\times}10^6$ cycles. During the test, the nondestructive tests using X-ray radiography and dye penetration method was performed to determine the presence of the cracks. Upon completion of the test, no cracks were found.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.151-154
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• 2005

Tilting train improves a traveling velocity through giving a tilt the car-body without ride comfort deterioration In curve. Dynamic behavior in deceleration will show quite another feature in constant velocity, In this study, we see through the dynamic behavior due to a variation of braking force in Korean Tilting Train. Hence we compose of 3D dynamic model, as well as we check upon the property in service braking condition and unique braking condition with a fault system. This study has the meaning with reference data of developing Korean Tilting Train test traveling.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.1107-1111
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• 2004

Tilting train improves a traveling velocity through giving a tilt the car-body without ride comfort deterioration in curve. Dynamic behavior in acceleration or deceleration will show quite another feature in constant velocity. In this study, we see through the dynamic behavior due to a variation of tractive force and braking force in Korean Tilting Train. Hence we compose of 3D dynamic model, as well as we check upon the property in service tractive condition and unique tractive condition with a fault motor. Besides we check upon the property in service braking condition and unique braking condition with a fault system. This study has the meaning with reference data of developing Korean Tilting Train test traveling.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.69-74
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• 2011

In the curving detection method by using an accelerometer, the ride comfort in the first car is worse than one in the others due to spend the time to calculate the tilting command and drive the tilting mechanism after entering in the curve. In order to enhance the ride comfort in the first car, the preditive curve detection method which predicts the distance from a train to the starting point of curve by using the GPS, Tachometer, Ground balise and position DB for track. In this study, we predicted and evaluated the ride comfort for predictive curve detection method in transient curves according to the shape and dimension of transient curve and the various driving speed. Also, we predicted the improvement of the ride comfort for predictive curve detection method by comparing with the result of the ride comfort for predictive curve detection method and for curve detection method using an accelerometer in the short transient curve.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2005.11a
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• pp.260-263
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• 2005

Fatigue fracture behavior of a hybrid joint between side-panel and under-frame by riveting and adhesive bonding has been evaluated. Two kinds of joint specimens based on real geometry were fabricated for shearing test as well as bending test. Static and cyclic loadings were used for fatigue assessment. Fatigue fracture results obtained by such experiments were reflected in modifications of design parameters of the hybrid joint.

• Proceedings of the Korean Society For Composite Materials Conference
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• 2003.04a
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• pp.65-68
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• 2003

Using composite materials for lilting train system has many advantages such as manufacturing variety, specific high-strength & stiffness characteristics, and long-life durability, but the strongest advantage could be the possibility of lightweight product. In the leading countries, the composite materials are used for the material fer drivers' cabs, interior/exterior equipments for railway train, and it is now developing the composite materials applied for the train car body structure. In this paper, we examine the use of composite materials for the drivers' cabs and interior/exterior equipments for the developing tilting train in Korea, and review the car body design using composite materials.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.634-639
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• 2004

Under light collision accidents, the energy absorption strategy for the coupler and expansion tube of the TTX(Tilting Train Express) initial design is established in the paper. Also, 1st shearing bolts are designed. When the absorbed energy of the coupler reaches its maximum, the connecting bolts between the coupler and the car body are sheared off not to transmit the impact force to the car body structure. To absorb more energy after the lst shearing bolts work, a expansion tube is designed conceptually and installed at the rear part of the coupler. Using Hyper-Mesh and LS-DYNA, pre/post processing and light collision analyses are preformed, respectively.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2004.10a
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• pp.68-75
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• 2004

In this paper a study on the reduction method of ground vibration by a french is carried out. The transmitted load into the ground which induces the ground vibration is computed through a study on the interaction between tilting car and the line. This load is applied into the numerical model which is one for a study on the reduction method of ground vibration by a trench. Then the numerical results is compared with the experimental results conducted in the previous study.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.157-162
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• 2005

This paper describes the system implementation of TMS(Train Management System) to be applied to a TTX(Korea Tilting eXpress). For better safety and reliability of vehicle, increased quantity and fast transmission of data between TC(Train Computer) and CC(Car Computer) and control equipment of train is required. To satisfy these requirements, this system uses RTOS(Real Time OS) so that do realtime data management, And it is implemented to minimize the noise inflow and a signal level reduction of the communication line. Also it is designed to suitable interface of a TTX vehicle and is verified by laboratory test.