Investigation of Effect of Stiffness and Damping Coefficient of Two Axle Car Body Suspension System on Critical Speed in Curved Track

Nowadays railway vehicles have determinant role in transportation of freights and passengers and usage of them strongly has been developed. One of the most important cases in moving of trains especially in high speed trains is critical speed in curved track. Generally for investigation of critical speed in railway vehicles can be analyzed wheelset, bogie and car body separately. There are many parameters that affect on critical speed of railway vehicles that can be named stiffness and damping coefficient in suspension system. In this paper has been investigated the effect of stiffness and damping coefficient of primary and secondary suspension system on critical speed and comparison of them for bogie and car body. After derivation of moving equation of wheelset, bogie and car body in curved track, codes. .. This study aims to examine this issue for Iran Air by scrutinizing the relationship between aircrafts costs and the size of commercial passenger jets for its selected domestic routes over.