This paper considers the dependence of the influence of the gas factor of a power fluid on the physical properties of hydraulic oils. When describing the processes, the hydraulic drive should be considered as a system with lumped parameters. The work is important because the hydraulic fluid is a mixture of liquid and undissolved gas. This mixture can arise when tanking and during dynamic processes because of the different dissolution rates of gas and flow rate of the liquid in a pressure fall in some spots of power fluid flow.

This paper reports the results of study of the influence of gas content in working fluid on the dynamics of hydraulic drive of equipment for oil and gas well development. A mathematical model of the hydraulic drive obtained in the Cauchy form is proposed. The dependence of piston speed, pressure in the piston chamber of the hydraulic cylinder, and pressure in the rod chamber of the hydraulic drive on time at 0 and 8% undissolved gas content in the fluid is established.

The problem of creating effective structures that ensure mutual rotation of the rotor and stator of an electric generator. The wide practical application of counter-rotor wind-electric generators, which provide a significant increase in specific power, is hindered by the disadvantages and low reliability of existing systems for removing electric energy from the windings of a rotating counter-rotor, due to the dry friction mode. It is possible to increase the reliability of the contact removal of electrical energy from the counter rotor (rotating stator) by replacing solid brushes with liquid metal contact groups, which will lead to a certain increase in the resistivity of the contact group, compensated by the contact area of the liquid metal with the contact ring. It is most advisable to use liquid metal contact groups based on gallium, which will raise the permissible temperature limit of operation by about 2 times compared to the achieved level to 275 °C and, thereby, additionally raise the specific power of the electric generator.

Currently, in the forest industry, methods of test control of the technical condition of the elements of the hydraulic drive of forest harvester machines have been used, based on the creation of special impulse actions on the hydraulic drive in order to obtain transient characteristics, the analysis of which allows to determine their technical condition. However, these methods can only be used for maintenance or repair of machines. Analysis of the work performed to date shows that the task of developing and developing methods for monitoring the state of hydraulic drives of technological machines is an urgent task. This article presents the justification of the spectral method for monitoring the technical condition of hydraulic drives of forest harvester machines during the full life cycle, based on the control of its load when operating with woods.

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