Laboratory tests of inlet pressure changes of electrohydraulic vibrations generator

In the paper laboratory researches are presented of the multi pump hydraulic power unit used for supplying pressure to the hydraulic systems, which characterise frequently occurring dynamic states of operation. It concern supplying e.g. electrohydraulic servodrive working in the capacity of shakers generating mechanical vibrations. Researches are carried out in order to characterise the mutual interaction of the hydraulic power supply and its receiver working under dynamic states. The authors investigate how real pressure course in the outlet of the hydraulic power supply is differing from the set up value stabilised by pressure relief valve. The influence of the hydraulic power unit surplus output flow and following pressure supply changes on the servomechanism operation is being investigated as well. Most interesting results of researches are illustrated by the time characteristics. (authors)