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  5. Mathematical modeling of the vibration characteristics of a specialized vehicle with a double-leveled system of nonlinear suspension moving thru the unit road irregularity

Mathematical modeling of the vibration characteristics of a specialized vehicle with a double-leveled system of nonlinear suspension moving thru the unit road irregularity

R.O. Kaidalov, V.M. Bashtovoi, A.A. Larin, A.A. Vodka, V.G. Barkalov
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The work deals with the definition of an effective way of the suspension on the specialized vehicles and is aimed on improvement of the smoothness of its movement (riding comfort). A riding comfort is an important operational feature of the modern vehicles that allow to protect the passengers and goods from the influence of the vibrations during the vehicle movement. These are especially important for the transportation of the dangerous goods. The paper presents the design scheme of specialized vehicles, which has additional level of cushioning, with the nonlinear characteristic, which has a quasi-zero stiffness in the equilibrium position. The mathematical model of the dynamic behavior of the specialized vehicles are developed as a nonlinear discrete system. The results of numeric calculations of the dynamic response of the vehicle on the impact is presented based on the developed model. A vertical vibrations of the luggage platform is analyzed caused by the kinematics impact that applied on the axis of the vehicle. The load is applied on the axis of the vehicle with time delay providing its vertical vibrations. The results of the comparative analysis is shown for the frequencies and amplitudes of the vehicle vertical vibrations within two different suspensions: in the linear and nonlinear statements under impact excitation.
Keywords: specialized vehicles, ride smoothness, nonlinear suspension, systems with quasi-zero stiffness, nonlinear free oscillations of conservative systems