مشخصات پژوهش

This paper presents a novel design procedure for the springs of wagons with two-stage suspension system, which satisfies the static, strength, and dynamic requirements as well as standard preferences. A relatively precise and detailed method is proposed for modeling the suspension elements for dynamic simulations. Three vehicle types are modeled by using the vehicle dynamics simulation package ADAMS/ Rail, providing details of the vehicles, bogies, suspension elements, constraints and kinematic connections. The suspension springs of bogie MD52 with a 1 m track gauge are modified. The wagons are subjected to different load conditions. The spring sets are calculated with the aim of satisfying static equilibrium condition, kinematic constraints, wagon height and vertical balance. Finally, the designed springs are used in simulations and results are compared with the standard permissible values. Lateral stability (hunting), critical speeds, safety (derailment ratios) and dynamic behavior (ride comfort) of each wagon type, subjected to standard track conditions and irregularities are evaluated