احمد محمدي دوست

Wheel crossing as the main source of vibration in the railway structure has always been considered by many researchers. Changes in track geometry, irregularities on the track, local defects on the rails, defects on the wheels and changes in the position of the load on the wheels and rails are other reasons for this vibration. Despite the importance of this phenomenon, direct measurement of the contact forces between the wheel and the rail is not yet possible. Generally, by measuring a parameter on wheels and rails, the values of the dynamic component of the force are indirectly estimated. In this dissertation, by examining different articles, principles and methods of measurement, several different states and arrangements of strain gauges to measure contact forces during a laboratory test are examined and then validated with a software model. After verification, these arrangements will be eva‎luated during a dynamic test at Mashhad railway station by passing various types of passenger and freight trains, and a comparison will be made in terms of sensitivity to parameters such as axial load, train speed, etc. Finally, the optimal arrangement of strain gauges in dynamic testing and in real service conditions was investigated

اندازه گيري نيروي ديناميكي , تماس چرخ و ريل , نيروهاي تماسي , روش هاي اندازه گيري

measurement of dynamic force , rail and wheel contact , contacts force , measurement methods

Ahmad mohammadi doost

H.molatefi