Vol 7, No 1 (2021): 10.03.2021

Renewable energy is the production of energy from resources that are inexhaustible on a human scale. The main principle is the use of energy from processes occurring in the environment.

Alternative energy is a set of promising methods for obtaining, transferring and using energy, which are less common than traditional ones, but are of interest due to the low risk of causing harm to the environment.

Currently, the generation of electricity through the use of wave energy is not common and is experimental. Nevertheless, it is one of the most promising renewable energy sources, and also has the potential to become one of the main components of the world's energy production.

In this work, a wave generator based on a hydraulic system has been designed. Various versions of this installation are considered, and the existing designs of such devices are analyzed. Based on this, the most efficient design was selected.

The following stages have been completed: the design of the wave generator, the design of the hydraulic system, the calculation of the system elements according the technical requirements, the selection of standard components and units, the calculation of efficiency and mathematical modeling of the system operation.

When adjusting the gas turbine engine for operating parameters, taking into account pressure pulsations in the gas generator path, acoustic probes are used with the sensor moving out of the high temperature zone. The input waveguide included in the probe is an acoustically resonating element that significantly distorts the measurement result. Among the various corrective elements for acoustic probes, in practice, a special role is given to non-reflective loads in the form of long lines. During bench tests, it is often advisable for manufacturers to use structures made up of durite hoses with short sections of metal pipelines in addition to long lines. The attached material shows the test results of a model probe with several types of such agreed loads. The possibility of such a solution to increase the accuracy of measuring pressure pulsations in conditions of increased temperatures is shown.

In this paper, the issues that need to be taken into account when analyzing the vibration state of rolling bearings with the defect "wear of the inner bearing cage" are touched upon. A design diagram of rolling bearings and a diagram of the forces acting on the bearings during their operation in a screw compressor are presented. Studies of the vibration state of rolling bearings on an operating screw compressor at a real industrial facility have been carried out. Vibration measurements were carried out when the compressor was operating with new bearings and with workers on whom there was obvious wear of the inner cage. The effect of wear of the inner bearing cage on the vibration state of the screw compressor is shown. It is established that for this type of bearing defect, in relation to the object un-der study, when analyzing the vibration state, the use of direct autospectral parameters is ineffective. For the case under consideration, the most effec-tive are the parameters of amplitude and frequency modulation.