The article contains a description of the design solutions proposed by the authors for a hybrid wind turbine bearing, in which the sliding part takes over the load to the turbine shaft after reaching the shaft rotation speed, ensuring hydrodynamic lubrication of the plain bearing and relieving the rolling bearing. This allows for low starting resistance of the power plant and ensures quiet operation during use. Two conceptual solutions of a hybrid bearing were presented, differing in the shape of the plain bearing journal. A mechanism for automatic switching of the load between a rolling and a plain bearing was developed. A solid simulation model of this mechanism was built in the Autodesk Inventor—Dynamic Simulation software Inventor Professional 2023 environment, and its operation was simulated. The results confirmed the usefulness of using this design in shaft-bearing systems of wind turbines with a vertical axis of rotation. Based on the simulation, the speed at which the thrust roller bearing will be released was determined. Technical parameters of a plain bearing with a spherical journal shape were calculated. The height of the lubrication gap and the shaft rotational speed at which the bearing load capacity index reaches a critical value were determined.

The operating costs of breaking coal particles into fine powder, to achieve optimum combustion for the boilers in a power plant, are made up of power input to carry on an energy intensive comminution mechanism and to overcome friction losses within pulverising machines. The operating costs also include the cost of the replacement of the processing system’s components due to wear. This study presents the development and application of an attrition test machine that enables an investigation of the factors that influence pulverizing efficiency. The attrition tester simulates grinding conditions in real vertical spindle mills. In this kind of mill, as with the tester, the size reduction process results from a shearing action during the redistribution of the coal particles. The redistribution and attrition within the coal bed are forced by movement of the rollers (or by a disc rotation, in the case of the tester). The testing method was oriented toward mechanical properties, i.e., internal friction shear strength, abrasiveness and grindability. This method enables facilitated testing procedures and a more exact simulation of grinding in vertical spindle coal mills. Ball-race mills and Loesche roller mills were used.

Known solutions of devices for crush hardening do not ensure sufficient effectiveness of machining the teeth of a gear working surfaces. Due to the need to increase the load to working machines, and thus the degree of gear effort, while reducing their dimensions (i.e. downsizing), it is necessary to search for, test and implement new solutions for strengthening the gears. The proposed solution of the device, intended for jet burnishing the working surfaces of the gear teeth with an arch tooth line met the increased requirements regarding the effectiveness of strengthening. Effective cooling and lubrication of the processed surface and a significant increase in the dynamic burnishing force enable exceptionally favourable operational properties of gear wheels to be obtained using the discussed device. The opposite direction of the peripheral speed of the machined wheel in relation to the speed of the burnishing stream allows for obtaining the greater depth of surface deformation, generating higher compressive residual stresses in the surface layer. The parameters of the burnishing process with this device can be easily adjusted within wide limits, and the final effect depends on the selection of the diameter and type of the backshot material, its ejection speed, processing time and the number of processing passes.