PARAMETRIC SYNTHESIS OF DIGITAL STABILIZER FOR DIRECTION STABILITY SYSTEM IN TANK CAR

Abstract

Unsatisfying state of domestic highways՚ road surface and low technical quality of domestic cars lead to high accident rate on roads. Accidents involving large vehicles equipped with 20–22 m3 tanks transporting fuel and aggressive liquid chemicals are particularly serious. The article considers the problem of creating on-tank vehicles direction stability systems with digital stabilizer, which provides high accuracy of stabilization of the car body in emergency braking due to the use of stabilizer algorithms of platformless inertial systems, as well as the choice of certain values of variable stabilizer parameters. The mathematical model of perturbed motion of the stabilization object considers the oscillations of the free surface of the transported liquid, which allowed to study the effect of these oscillations on the stability of a closed stabilization system and accordingly choose the range of allowable values of variable parameters. This computational procedure is a combination of two optimization methods — the scan grid method of Sobol for finding the global minimum zone and the Nelder-Mead method, which is implemented by the software product «Optimization Toolbox» of MathLAB package. The procedure also, in parallel with the numerical solution of the optimization problem, selects the values of the weights of the additive functional. As a result of solving the problem of parametric synthesis, the values of the varied parameters of the digital stabilizer are obtained, which provide high accuracy of stabilization of the tanker car body relative to a given trajectory in the mode of emergency braking.