Time dynamics of the nematic liquid crystal director in the field of a sequence of rectangular pulses

We study theoretically and experimentally the Freedericksz transition in a sequence of rectangular pulses. We show the dependence of the accumulation effect on the pulse filling coefficient. We demonstrate that at a constant energy value in a pulse, the accumulation phenomenon substantially depends on the pulse repetition frequency. An analytical consideration of the initial stage of development of orientational instability fully confirms the conclusions of numerical analysis. The results of experiment agree well with the conclusions of theoretical analysis.