Shock-wave Processes Modelling on Railway Vehicles Using a Scaled Model Utilizing Viscoelastic Properties

Abstract

The shock impacts on the railway vehicles with two-stage spring suspension excite in working mode. These impacts change the kinematics components of the movement, i.e. linear and angular speeds at the end of the shock process and free damped vibrations of the mechanical system arise. In this paper, our aim is to perform a dynamic scaling of the original model in order to build up a new double mass model utilizing viscoelastic properties which is smaller with small masses and is easier to work even possible in laboratory conditions. The new dynamically scaled model is supposed to perform the same behaviour as the original one if its natural frequencies are the same with the original model. The two masses M1 and M2 of the new double mass scaled utilizing viscoelastic properties model are calculated after optimization performed with numerical calculations of the characteristic polynomial varying with masses in order to fit the same natural frequencies. The objective of the work presented in this paper is to model the shock-vibrations response of the railway vehicle using a scaled model utilizing viscoelastic properties and to compare the results derived here with the results obtained using the original model.