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Abstract

Approaches of mathematical modeling and calculation results for the loading of vehicle structural elements are presented (using the example of typical design solutions of modern armored personnel carriers). The mathematical model takes into account the peculiarities of the working process of loading during detonation on a mine underneath the front wheel in the direction of movement. The peculiarity lies in taking into account the simultaneous action of excess gas pressure on the wheel and the bottom of the machine body. The influence of the main parameters of the research object in terms of geometry, stiffness, damping, mass and weight is taken into account. The main nonlinearities of elastic damping connections of structural elements (wheels with the machine body and with the supporting surface) are also taken into account. The calculations were made by the numerical Runge - Kutta method with a variable step. With the help of the original program, calculations were carried out and a comprehensive quantitative assessment of the features of the working process of loading during blasting was obtained. The complexity of the assessment consists in a quantitative assessment of the effect of an external force factor, both separately (applied only to the wheel or only to the bottom) and together (excess pressure acts both on the wheel and on the bottom). It has been established that there is a shift in the peak values of the force on the vehicle body during suspension breakdown and accelerations on the vehicle body in the driver's seat and directly on the driver. The reason for the shift of 0.019 sec is the transformation of the force flow on the way from the wheel to the body of the machine during detonation. The magnitude of changes in the parameters of the power flow depends mainly on the value of the given parameters of the wheel suspension (mass, stiffness, damping) and the parameters of the impulse disturbing force factor applied to the wheel. At the same time, the disturbing force factors applied to the wheel and to the body of the machine during blasting differ significantly in magnitude and duration of action. The force factor applied to the wheel is 5.06 times greater than the force factor applied to the body, and the action time is 9.7 times less. It has been established that, taking into account the simultaneous action of excess gas pressure on both the wheel and the bottom of the car body, the driver's acceleration rate from suspension breakdown is 6.33 times greater than the fraction from the gas action on the bottom.