Search

The paper proposes an air multi-jet cooling system, mounted in the block drum-shoe brake of a vehicle. A method for controlling the energy load of a friction unit of a drum-shoe type using its cooling by the ejector system is proposed. The load and heat fluxes in the friction unit of the advanced drum-shoe type brake device are analyzed.

In the work, a liquid cooling system mounted in the block of a drum-shoe brake of a vehicle is proposed. A method for calculating the temperature of the outer surface of the rim of the brake drum is proposed. The dependence of the thickness of the rim on the temperature of the outer surface of the rim of the brake drum is given.

The most important parameter evaluating the technical condition of power plants is directly the pressure in the lubrication system. At various operating modes of power plants, emergency conditions may occur, accompanied by a resonant change in the pressure in the lubrication system. This article describes one of the possible methods for assessing the operating mode of the lubrication system of power units. The analysis of control methods and measures to identify dangerous operating conditions of the lubrication system is presented.

The purpose of the lubrication system of an internal combustion engine is to provide optimal conditions for the formation of an oil film in all friction pairs, such as a piston-cylinder, piston rings-cylinder, main and connecting rod bearings, etc. The oil film is designed to minimize wear of elements while ensuring the smallest possible friction loss. The lack of continuity of the oil film, and therefore the boundaries or mixed friction conditions, obviously have a negative effect on friction losses. Nevertheless, a continuous oil film, depending on the conditions of its formation, can be characterized by different values of friction losses. One of the factors that can affect the conditions for the formation of an oil film is the amount of oil pressure in the lubrication system. The article presents the results of studies on friction losses carried out on an engine test bench. The study consisted of measuring the torque of an internal combustion engine using an electric machine, which is the source of the load on the internal combustion engine.

ITER (International Thermonuclear Experimental Reactor) is a nuclear fusion research and engineering project. It is supposed to be the first fusion device to test the integrated technologies, materials and operational regimes necessary for the commercial production of fusion-based electricity. Front (explored in this paper) and Back diagnostic racks are used as supporting structures of the so-called ITER Divertor Thomson Scattering (DTS) Diagnostic System that is created to measure plasma characteristics. They will be attached to the lower port walls (ITER ports are used to locate diagnostic equipment and its supporting structures) through the so-called Divertor Rails. The developed design of the Front (Diagnostic) Rack locking (e.g. Rack attachment to the rails mechanism) was analyzed in this research to be consistent with thermal stresses, electromagnetic and seismic loads taking into account some specific assembly and maintenance loads including preloading under installation. The analysis of the rack locking design’s resistance to the mentioned loads should prove correspondence of the suggested common rack design with the structure integrity criterions. Construction strength under the most severe loading scenario was estimated in this research and appropriate conclusions were made. It was found out that the stress criterion was not fully satisfied, so a new rack locking design concept was proposed. Its main details are also described at the end of this article.

ITER is a nuclear fusion research and engineering project. It is supposed to be the first fusion device designed for testing the integrated technologies, materials, and physical aspects necessary for development of the commercially available fusion-power plant. One of the important components of the project is optical diagnostic systems with collecting mirrors. These mirrors have to provide stability of optical systems under severe loads of different types that could possibly arise in the tokamak. The collecting mirrors of several ITER diagnostics have a large scale and should be installed into diagnostic ports. Thermal stress analysis of the mirror updated design is aimed to obtain deformation and rotation values of the mirrors’ reflecting surfaces in order to conduct ray tracing analysis and to edit mirrors alignment to provide correct functioning of the optical systems. The maximum temperature values of the Divertor Thomson Scattering collecting mirrors were estimated for the normal operation mode. The FE model of the second mirror takes into account all the force boundary conditions, basic kinematic boundary conditions and constraints. Boundary conditions taken for the simulation were applied on surfaces contacting with the diagnostic rack. Thermally stressed state was calculated and corresponding displacement and rotation distributions were obtained.