Browsing by Author "Kravchenko, Alexander"

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Divergent bifurcations of stationary motion modes of wheeled vehicle model with controlled wheel module
(Polish Academy of Sciences Branch in Lublin, Lublin, Poland, 2016-12) Kravchenko, Alexander; Кравченко, Олександр Петрович; Кравченко, Александр Петрович; Verbitskii, Vladimir; Вербицький, Володимир Григорович; Вербицкий, Владимир Григорьевич; Khrebet, Valeriy; Хребет, Валерій Григорович; Хребет, Валерий Григорьевич; Velmagina, Nataliya; Вельмагіна, Наталія Олександрівна; Вельмагина, Наталия Александровна; Muranov, Andrey; Муранов, Андрій Сергійович; Муранов, Андрей Сергеевич
An alternative approach of the determining of conditions of safe stability loss of rectilinear motion of a wheeled vehicle model with controlled wheel module in the sense of N.N. Bautin is considered. Skid forces are presented accurate within cubic expansion terms in the skid angles. Terms and conditions of safe stability loss depend on the ratio between the coefficients of resistance to the skid, the adhesion coefficients in the transverse direction of the axes and the parameter of torsional stiffness of the controlled wheel module.The presented approach to the analysis of real bifurcations related to the divergent loss of rectilinear motion mode stability has a clear geometric pattern: if in the vicinity of rectilinear motion at subcritical speed, there are additionally two unstable circular stationary states, then the stability limit is of dangerous nature in the sense of N. N. Bautin; if two circular stationary modes exist at supercritical speed, the limit of the stability loss in the parameter space of the longitudinal velocity is safe in the sense of N.N. Bautin. Analysis of the number of stationary modes in the vicinity of the critical velocity of rectilinear motion is performed for the obtained determining equation - cubic binomial.
Force structure impact on the wheel module stability and oscillation process
(Polish Academy of Sciences Branch in Lublin, Lublin, Poland, 2013-10-10) Kravchenko, Alexander; Кравченко, Олександр Петрович; Кравченко, Александр Петрович; Verbitskii, Vladimir; Вербицький, Володимир Григорович; Вербицкий, Владимир Григорьевич; Khrebet, Valeriy; Хребет, Валерій Григорович; Хребет, Валерий Григорьевич; Velmagina, Nataliya; Вельмагіна, Наталія Олександрівна; Вельмагина, Наталия Александровна
The stability and shimmies of the front non-steerable pillar free to turn on two channels – the yaw and roll relative to the longitudinal axis of the body is analyzed. The analysis of the typical system parameters impact on the unstable oscillatory region and oscillation amplitude is carried out. The approximation percent influence of the slip force and heel moment on the oscillation character is considered.
The Steerability and Stability of Automobile Non-linear Model
(Polish Academy of Sciences Branch in Lublin, Lublin, Poland, 2012-12) Kravchenko, Alexander; Кравченко, Олександр Петрович; Кравченко, Александр Петрович; Verbitskii, Vladimir; Вербицький, Володимир Григорович; Вербицкий, Владимир Григорьевич; Khrebet, Valeriy; Хребет, Валерій Григорович; Хребет, Валерий Григорьевич; Velmagina, Nataliya; Вельмагіна, Наталія Олександрівна; Вельмагина, Наталия Александровна
The problem of the automobile course stability is considered. The changeable steering character based on the analysis of non-linear velocipede model is analyzed. Generalized dependence determining “the steering curve” is obtained. Conditions caused the loss of stability with increasing speed while moving within the constant radius circle regarding the bifurcation set are analyzed. кубического двучлена.