Evaluation of wheel machines sustainability with account of support contour modification features

Abstract

It is established that to evaluate the static stability of wheeled vehicles it is possible to use different approaches that have different accuracy and costs for their implementation. The most acceptable is the preliminary assessment of stability analytically and finally – with the help of existing equipment based on specially developed approaches and methods. It has been established that the greatest danger of rollover in the transverse direction for articulated machines exists when located at the maximum slope with the maximum folded frame relative to the tilting axis passing through the characteristic points of the structure parallel to the horizontal slope generator (special stand). The recommended schemes for the installation of articulated vehicles are proposed for determining the angle of static stability of the front section, the rear section and at the blocking of the hinge. A method is developed that improves the accuracy of estimating the angles of static stability of wheeled articulated vehicles, taking into account the features of the change in the support contour. Dependences are proposed for determining the angle of the transverse static stability of sections, taking into account the assumption of the location of the support contours of the machine on the supporting surface due to the low height of the hinge arrangement. It is established, on the example of articulated wheeled vehicle with a nominal pulling force of 30 kN, that the angle of static stability of the front section decreases by 15 - 30%, the rear section – by no more than 8 -10%. Accounting for the angles of folding sections up to 150 allows you to specify the angles of static stability to 50. The corresponding recommendations in the regulatory document have been developed. As a result of the conducted researches, a method for estimating the angles of static stability, adapted for articulated wheeled vehicles, taking into account the features of their design, has been developed. The practical implementation of the method is proposed in the form of the developed SPSAV (Static Position Stability of Articulated Vehicles) software for preliminary assessment of the static stability of such machines without the use of expensive equipment. The obtained results can be used in the design and certification of articulated vehicles, the evaluation of the stability of cars with trailers.