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Mathur, Rakesh
- Dynamic Response of Linke Hofmann Busch (LHB) Rail Coach Considering Suspended Equipments
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Authors
Affiliations
1 Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad - 211004 and North Central Railway, Allahabad of Indian Railway-211001, IN
2 Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad – 211004, Uttar Pradesh, IN
3 Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad - 211004,Uttar Pradesh, IN
1 Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad - 211004 and North Central Railway, Allahabad of Indian Railway-211001, IN
2 Department of Applied Mechanics, Motilal Nehru National Institute of Technology Allahabad – 211004, Uttar Pradesh, IN
3 Department of Mechanical Engineering, Motilal Nehru National Institute of Technology Allahabad - 211004,Uttar Pradesh, IN
Source
Indian Journal of Science and Technology, Vol 10, No 38 (2017), Pagination:Abstract
Objectives: The study of rail coach under dynamic condition has been ever needed for rail engineers. Vertical and lateral responses of coach body are the primary parameters to assess the comfort level of travelling passengers. Methods: The present study aims at dynamic behavior of a LHB coach against track irregularities and the suspended equipments underneath the coach body. The suspended equipments are mounted to provide basic amenity requirements. The track irregularities are assumed to be random profile and characterized in terms of PSD as per FRA standard. The coach body is modeled using finite element methodology in which system matrices such as mass, stiffness and damping matrices are obtained for Eigen value solution. Findings: Using the modal parameters obtained as above and PSD of track irregularities, both vertical and lateral Mean Square Acceleration Responses (MSAR) are determined at various points of interest on coach body. It is observed that the peak responses in vertical direction occur in low frequency range (0-10 Hz) which is caused by long wavelength irregularities of track that causes discomfort. It is also observed that peak lateral responses occur at still lower frequency as compared to vertical response which is again discomfort to vehicle riders. This is because of the sensitivity of human being against vibratory motion falls in low frequency range. This concludes that there is a scope of improvement in comfort level with minor adjustments of suspended equipments of coach body. The present paper deals with dynamic analysis of coach body considering suspended equipments which have not been addressed earlier. Also, it is suggested that if the mass and relative position of suspended equipments including other parameters are changed, then the ride comfort can be improved. Application: The outcome of the paper may helps the rail coach designer to improve the future coach design providing better comfort even in the low frequency range of operation.Keywords
LHB Coach, PSD, Responses, Suspended EquipmentsFull Text
- Dynamic Analysis of Linke Hofmann Busch Coach and Determination of its Sensitive Design Parameters Considering Suspended Equipments
Abstract Views :235 |
PDF Views:119
Authors
Affiliations
1 Dept. of Applied Mechanics, MNNIT, Allahabad, IN
2 Dept. of Mech. Engg., MNNIT, Allahabad, IN
1 Dept. of Applied Mechanics, MNNIT, Allahabad, IN
2 Dept. of Mech. Engg., MNNIT, Allahabad, IN
Source
International Journal of Vehicle Structures and Systems, Vol 10, No 4 (2018), Pagination: 231-245Abstract
This study aims at dynamic behaviour of a Linke Hofmann Busch coach and its sensitive parameters against track irregularities considering various suspended equipment. The randomly distributed track irregularities characterized in terms of Indian Rail Road PSD standard are considered main source of excitation that produces undesired vibrations. The coach body and bogie frame subjected to 4 degree of freedom motions (bounce, lateral, roll and pitch) are modelled using finite element methodology where system matrices such as mass, stiffness and damping matrices are obtained for eigenvalue solution. Using modal parameters obtained as above and PSD of track irregularities, both vertical and lateral mean square acceleration responses (MSAR) are determined at various points of concern on coach body. It is observed that the vertical peak responses occur in low frequency range (0-10 Hz) which is caused by long wavelength irregularities of track that causes discomfort. It is also observed that constant peak lateral responses occur at still lower frequency as compared to vertical response which again causes discomfort to vehicle riders. This concludes that there is a further scope of improvement in comfort level with minor adjustments of suspended equipment of a LHB coach. A sensitivity analysis based on the partial derivatives against FRF displacement is conducted and most sensitive design parameters are obtained for optimization to improve ride comfort. It is suggested that if the mass of bio toilet tanks and relative position of battery box + transformer unit i.e. most sensitive parameters of suspended equipment are changed then the ride comfort can be improvedKeywords
Linke Hofmann Busch Coach, Suspended Equipments, Power Spectral Density, Dynamic Responses, Finite Elements.Full Text
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