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The concept of design of adaptive materials composed of elements with controllable yield stresses is presented and the corresponding, gradient-based numerical design tools are described. Numerical simulation of the adaptation effect to various impact scenarios is demonstrated. The crucial point to get an additional value of energy dissipation (due to synergy of repetitive use of dissipaters in honeycomb-like cellular microstructure) is to pre-design an optimal distribution of yield stress level in all controllable elements, triggering a desired sequence of local collapses. High effectiveness of active impact energy absorption by the yield stress adjustment demonstrates potential application of the concept e.g. in shock-absorbing systems.

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The paper presents a study of the impact of oil mineral-based and synthetic-based oils on the efficiency of the single stage cycloidal gear. Experimental studies were carried out for different loads and input speeds of the gears. The reference levels were the results of theoretical calculations of efficiency of the cycloidal gear obtained at the corresponding values of loads and input speeds as in the experiment.