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Harsha, S. P.
- Effect of Multiple Location Defects on the Dynamics of Draft Gear used in Freight Railway Wagon
Abstract Views :231 |
PDF Views:143
Authors
Sachin S. Harak
1,
Satish C. Sharma
1,
Sanjay Shukla
2,
Parinay Gupta
2,
Sanjay Kumar
2,
S. P. Harsha
1
Affiliations
1 Vibration and Noise Control Lab., Mech. and Ind. Engg. Dept., Indian Institute of Technology, Roorkee, IN
2 Research Design and Standards Organization, Ministry of Railways, Lucknow, IN
1 Vibration and Noise Control Lab., Mech. and Ind. Engg. Dept., Indian Institute of Technology, Roorkee, IN
2 Research Design and Standards Organization, Ministry of Railways, Lucknow, IN
Source
International Journal of Vehicle Structures and Systems, Vol 7, No 3 (2015), Pagination: 107-113Abstract
The present work investigates the effect of crack location on the modal frequency of draft gear used in autocouplers of freight railway wagon for various orientations. First seven mode shapes of a healthy draft gear have been determined using finite element approach. Defect of semi-elliptical shape is modelled in the lateral as well as longitudinal direction of the draft pad which is a component of draft gear. Various damage scenarios have been simulated by considering multiple locations of the crack in the draft gear for different orientations. Effect of crack orientation and defective pads location on the natural frequency of draft gear is analysed. It is seen that for single defective pad as well as multiple defective pads, the natural frequency of draft gear is dependent on the dynamics of draft pad. It is also observed that defect in consecutive pads causes more change in frequency as compared to single defective pad. As far as the location of defective pad is concerned, it is seen that the draft gear frequency is more sensitive to defective pads located either near the housing base plate or top follower. This study provides a tool to diagnose crack defect in draft gear based on vibration characteristics.Keywords
Draft Gear, Draft Pad, Natural Frequency, Crack, Mode Shape, Finite Element Method.Full Text
- Computational Fluid Dynamics Analysis of Empty Railway Freight Wagons
Abstract Views :240 |
PDF Views:206
Authors
Affiliations
1 Mechanical & Industrial Engg. Dept., Indian Institute of Technology, Roorkee, IN
1 Mechanical & Industrial Engg. Dept., Indian Institute of Technology, Roorkee, IN
Source
International Journal of Vehicle Structures and Systems, Vol 7, No 1 (2015), Pagination: 25-30Abstract
Increase in the speed of train leads to aerodynamic problems. These problems occur due to turbulent behaviour of air flow around the train. So it is of great concern to study the dynamics of fluid flow. This paper deals with the dynamic analysis of empty freight wagons due to air turbulence using computational fluid dynamics. The effect of important aerodynamic coefficients such as aerodynamic drag, pressure distribution and velocity stream line has been studied on realistic and simplified freight train geometries. The geometry is a scaled model of freight open wagon type ‘BOXN25’ from Indian Railways. The aerodynamic analysis for empty wagons shows that the critical stress zone and the air drag effect are comparable between the two considered geometries.Keywords
Aerodynamic Drag, Computational Fluid Dynamics, Turbulence, Freight Wagon.Full Text
- Finite Element Analysis of Cartridge Tapered Roller Bearing of Freight Wagon
Abstract Views :228 |
PDF Views:137
Authors
Affiliations
1 Dept. of Mech. Engg., IIT Roorkee, Uttarakhand, IN
1 Dept. of Mech. Engg., IIT Roorkee, Uttarakhand, IN
Source
International Journal of Vehicle Structures and Systems, Vol 10, No 3 (2018), Pagination: 174-178Abstract
Freight trains run under high service loads during consignment loading and operation so tapered roller bearings are ideally suited to wheel bearing applications. The tapered roller bearings used in the railway industry are of a standard design fixed by the American Association of Railroads regulations. Nowadays rail industry improves the train operating speeds, which means that failure of a bearing will result into a derailment, affecting human lives, network disruption, and damage to the railroad, unplanned maintenance costs, and generating fear in general public about rail transport. So the rail industry has focused on the improvement in maintenance work and improvement in component design. This paper discusses the results of finite element analysis and model analysis of Cartridge Tapered Roller bearing (CTRB). Solid modelling of CTRB has been done using solid works. The CTRB is then discretized using ANSYS software and 3D hexahedral solid elements are used to mesh the components. The effect of vibration modes on the dynamic behaviour and stability of wagon is described. Frequencies up to a range of 100 Hz are considered for mode shapes.Keywords
Railways Vehicle, Cartridge Tapered Roller Bearing, Natural Frequency, Mode Shapes, Finite Element Method.Full Text
References
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- S.S. Harak, S.C. Sharma, S.P. Harsha. 2014. Structural dynamic analysis of freight railway wagon using finite element method, Proc. 3rd Int. Conf. Materials Processing and Characterisation, Procedia Materials Science, 6, 1891-1898.
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- A. Shukla and S. Harsha. 2015. An experimental and FEM modal analysis of cracked and normal steam turbine blade, Materials Today, 2, 2056-2063. https://doi.org/10.1016/j.matpr.2015.07.191.
- S.S. Harak, S.C. Sharma and S.P. Harsha.2015. Modal analysis of prestressed draft pad of freight wagons using finite element method, J. Mod. Transport, 23(1), 43-49. https://doi.org/10.1007/s40534-014-0064-9.
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