Railway Vehicle Dynamics - a.y. 2016/2017
Period (Year/Semester): II/I
Required/expected prior knowledge: Nothing
Lecturers: Mario Terzo
The course aims to provide the basic knowledge for learning the dynamic phenomena that characterize the railway vehicle. The interaction of the vehicle with the outside environment is approached starting from the study of the wheel-rail contact, and then the issues related to the dynamics of the wheelset, bogie and vehicle body are detailed.
Tables of contents:
Wheel-rail contact, adhesion in railway, geometric slip, kinematic slip, normal interaction, Hertz theory, tangential interaction, pseudo-slip condition, Kalker’s linear model, Johnson-Vermeulen model, Kalker's complete model, heuristic theories.
Railroad equipment, gauge, track profiles, wheel profiles, equivalent conicity, gravitational stiffness.
Wheelset, independent wheelset, differential effect, hunting oscillation, Redtenbacher formula, Klingel formula.
Dynamics of wheelset, bogie and vehicle body, guidance, stability.
Railway safety, derailment, uncompensated acceleration, over-elevation line, roller centers, active and passive suspensions, primary and secondary suspension systems, vertical dynamics. Braking systems.
Lectures and laboratory.
Textbooks and learning aids:
M. Panagin : Dinamica del veicolo ferroviario, Levrotto e Bella, Torino
V.K. Garg, R.V. Dukkipati : Dynamics of railway vehicle systems, Academic Press Canada
Assessment will be oral.