Zewdu, Abdi (PhD)Tolossa, Deberie (Mr.)Fiseha, Mengisteab2019-06-242023-11-042019-06-242023-11-042014-08http://etd.aau.edu.et/handle/123456789/18562This paper presents parametric analysis study of the influence of rail vehicle parameters on vertical and lateral car body accelerations. Vehicle parameters such as bogie wheel base, primary and secondary suspension parameters, car body mass, car body yaw, pitch and roll mass moment of inertias have been studied by varying from - 25% to +25% of their original values. The analysis was conducted by modeling and simulating 41 DOF passenger rail vehicle using SIMPACK, multibody dynamics simulation software. The considered vehicle was a conventional rail vehicle with typical measured rail irregularities from SMPACK model data base. The parametric analysis results, in the human ride sensitivity frequency ranges i.e. 0.5-2Hz for lateral and 5-10Hz for vertical accelerations according to ISO 2631, showed that car body mass, car body pitch mass moment of inertia, secondary suspension vertical damping, secondary suspension vertical stiffness, primary suspension vertical damping, primary suspension vertical stiffness and wheel base were sensitive parameters influencing vertical car body acceleration. While lateral acceleration of the vehicle was influenced by car body mass, car body roll & yaw mass moment of inertias, and secondary suspension lateral stiffness & damping, primary suspension lateral stiffness & damping and wheelbase. The analysis was validated by comparing with experimental results. The study will give vital information to designers in optimization of rail vehicles.Parametric analysisVehicle accelerationVertical rideLateral rideRide comfortRide behaviorThesis