Abstract
Vibration of a tracked vehicle caused by the excitation of rough road has a major influence on vehicle performances such as ride performance, dynamic load of parts, impact force on suspension system and etc. This impact force is main reason for overloading, destroying and reducing lifetime parts of suspension system and vehicle. In addition, this impact force can also destroy road surface. Therefore research of impact force on suspension system of tracked vehicle has great significance on calculating strength of parts and road design. This paper presents a method to define impact force on suspension system of tracked vehicle based on linear and nonlinear models, while a vehicle is traveling at variable speeds on rough road with sine profile. In linear vibration model, impact force defined by analytic method, data for calculation used by document specialty. In nonlinear vibration model, impact force defined by immediate solve differential equation, data for calculation defined by experiment. The nonlinear factors of suspension system are nonlinear characteristics of spring and damper elements. The investigating road has sine surface, as this kind of road often causes resonance with great amplitude, which can destroys parts of suspension system. The Matlab-Simlink software is used for calculating with graph results. The result of this paper can be considered when calculating the strength of parts of suspension system. In addition, the value of frequency can help us in determining life-time cycle of parts in suspension system of a tracked vehicle.
Keywords: Suspension system, spring element, damper element, vibration model, impact force