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	To some dynamic properties of parametric - heteronomous systems with internal kinematic couplings and split power flow Hortel, Milan ; Škuderová, Alena The contribution deals partly with the problems of influence of material damping of gearing by normal and inverse mesh and the effect of viscous damping of lubricant surrounding, i.e. the influence of oil during cog contact bounce in the gap - technological backlash and partly with the analysis of issue causation of sharp discontinuity locality in the resonance characteristics, which is associated with the cog contact bounce with the impact effects in dependence with given resonance tuning, the gear mesh duration term on stiffness level of the parametric stiffness function or the modify stiffness function, inclusive the time phase shifts of relative motion towards these stiffness function. Detailed record
	To influence of damping on impact effects in gear mesh Hortel, Milan ; Škuderová, Alena The motion equations of nonlinear parametric system of kinematic pair with elastic supported cog wheels were assembled on the basis of analytical Lagrange’s theory of mechanics, principle of virtual work, d’Alembert’s principle of conversion of kinetics problem onto statics and Lagrange’s release principle and analytical solved by means of equivalent nonlinear integrodifferential equations with solved kernels in the form of split Green’s resolvent. The influence of linear and nonlinear damping in the several phasis of gear engagement onto impact effects in gear mesh is solved in the contribution by means of numerical simulation in MATLAB/Simulink. Detailed record
	To issue of tooth backlash in dynamics of aeronautical and mobil gear systems with split power flow Hortel, Milan ; Škuderová, Alena In framework of internal dynamics of highparametric gear systems with split power flow the impact effects caused by greater dynamic than static-elastic deformations in the gear mesh have important role. They cause not only the additional dynamic load of gear pairs, but also violation of existence conditions of continuous carrier layer of lubrication. This make possible creation of dry friction in gear mesh with eventuality of self-excited vibrations rise and consequently decrease of gearing service life. Detailed record

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