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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Mehdi Ghanimoghadam (검색결과 1 건)
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Jabbar Ali Zakeri,Morvarid Fattahi,Mohammad Mehdi Ghanimoghadam 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.6
One of the major problems of railroad deterioration is uneven settlement which occurs due to various reasons, including existence ofdefects in substructures, using non-homogenous ballast, or being poorly drained. Sometimes, because of these problems, sleepers remainfreely as a part of vertical displacement and contact the ballast with load increase. Different models have been presented for checking theeffect of hanging sleepers on the dynamic interaction of rail and train. In this paper, a mathematical model was developed for railwaytrack and differential rail displacement with supported and unsupported sleepers was compared by modeling sleepers such as partiallysupported ones. On this basis, the motion equations of the train-track system were solved considering the non-linearity of wheel/rail contactform and using numerical integration in the time domain. Longitudinal sections of the track model were coded in Matlab softwareand the effect of one, two, or three partially supported sleepers and various spacing of sleepers on the sleepers and rail displacement wasstudied and compared with that of the unsupported one. It was shown that, with increasing the sleeper spacing from 50 to 75 cm, raildisplacement increased from 7 to 22% in the unsupported sleeper and 5 to 8% in the partially supported sleeper. Additionally, rail displacementincreased from 13 to 74% by changing the number of the unsupported sleeper from 1 to 9. Also, it increased from 6 to 24% inthe partially supported sleepers.
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