METHOD FOR DETERMINING SAFETY AGAINST DERAILING AT RAILWAY ACCIDENT

Dobrinka Atmadzhova

Scientific paper ID 1614 : 2018/3

METHOD FOR DETERMINING SAFETY AGAINST DERAILING AT RAILWAY ACCIDENT

Dobrinka Atmadzhova

Dynamic parameters that are directly related to derailment are forces in the contact area between the rail vehicle and the track. The relationship between the lateral and vertical forces in the wheel-rail contact exceeds a certain limit value. This value depends on the angle of the flange, the contact geometry and the friction coefficient. The state of safety against derailment based on the ”Nadal” criterion but modified by considering the duration of the wheel-rail interaction pulse (or the distance through which the actual derailment is performed) is an essential element in the assessment of the dynamic properties of the rail vehicles and their approval for operation in accordance with the provisions in force. The article examines an experimental-calculation method for determining the safety criterion against derailment under quasi-static conditions. The experimental determination of the criteria of safety against derailment in quasi-static conditions is carried out by direct measurement of the horizontal and vertical forces at the wheel-rail attackers wheel, by direct measurement of the bearing force of the wheelset, the vertical forces on the axle-box and the static vertical wheel load, as well as the dependence of Euro norms and UIC codes. The method is applied to determine the safety criterion against derailment in a railway accident.

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Подвижен железопътен състав безопасност железопътно произшествие дерайлиране.Rolling stock safety railway accident derailment.Dobrinka Atmadzhova

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