Science and Education Publishing American Journal of Mechanical Engineering 2 7 2014 10 07 Some Methods of Analysis of Chaos in Mechanical Systems 199 203 EN Peter Sivák Department of Applied Mechanics and Mechatronics, Faculty of Mechanical Engineering, Technical university of Košice, Košice, Slovakia Ingrid Delyová Jozef Bocko Juraj Šarloši AJME2014276 10.12691/ajme-2-7-6 2014 09 03 2014 09 17 2014 10 07 Solution of non-linear dynamic systems is dependent on exact knowledge of the initial conditions. Even a slight deviation of these values can cause substantial change in the overall course of the event. It then appears chaotic. Development of such dynamic system can be represented using abstract phase space through attractors, fractals, etc. A typical example is Lorenz attractor, which is in a three-dimensional view shaped as two intertwined spirals. Rössler attractor is a relatively simple system on which chaos in geometric form can be shown in a time sequence. Among the non-traditional oscillators in non-linear mechanics can be classified Duffing and Van der Pol oscillators. This paper shows an example of a chaotic attractor formed in a non-periodic mode, obtained in an experiment of water dripping from an unclosed valve.