Rakhsha R., Ghazavi S.

This research confirms advantages of fuzzy logic dampers in railway vehicle suspension system. Active suspension consists of four active dampers act as the secondary suspension instead of passive dampers. Employing fuzzy logic control policy, the active damping force is determined. An integration of a control design tool, i.e. MATLAB, together with a tool for railway vehicle simulation, i.e. ADAMS/Rail are utilized for modeling and control design in this work. Analysis has been performed on a traditional model with passive secondary suspension and on one new model with active suspension system with fuzzy logic controller. The effects of suspension system on displacement and acceleration in passenger seats have been investigated in various points of car body. Results show that the active suspension act perfectly against random displacement inputs caused by track irregularities imposed under wheels. By using fuzzy logic dampers we can control and reduce the acceleration magnitude in car body and improve the ride comfort quality. Results demonstrate the effectiveness of fuzzy logic dampers for active control of vibration in high speed trains. By using this kind of active dampers, high quality in ride comfort together with high speed traveling is accessible.