Categorypublications

MODELING OF HIGH-SPEED FLYWHEEL DESIGNS FOR TECHNOLOGICAL EQUIPMENT

M

The article analyzes the design of mechanical energy drives and their use areas. Based on the analysis, the kinetic energy drive designis based on the composite material’s flywheel, capable of working with a high frequency of rotation. The most optimal flywheels in terms of accumulation of kinetic energy and at the same time the maximum strength of the design are proposed, and their numerical simulation is carried out. The modal analysis results established the values and forms of the eigenfrequencies of oscillations of rotors with flywheels of various structures, which allows controlling the process of overclocking, knowing the limit values of the maximum permissible frequency of rotation of the flywheels. Numerical modeling established that the flywheel’s shape and its mass significantly affect the rotor speed limit with the flywheel. At the same time, the flywheel with the lowest mass but the highest frequency of rotation has the maximum specific energy intensity per unit of mass, which determines it as the most effective option in terms of the cost of material and the use of this design in devices for energy accumulation during the operation of technological equip-ment. The calculation results also show that the lamb flywheel has the most incredible absolute energy in-tensity. Simultaneously, the costs of the composite material above 68% are compared with the flywheel, which has the maximum specific value of the energy intensity per 1 kg of its mass

TESTS OF THE TIME CONSUMPTION OF THE OPERATIONS PERFORMED AT THE WORKSTATION FOR ASSEMBLING AND DISASSEMBLING ENGINE

T

The paper includes the description of the tests on the time consumption of the operations performed at the workstation for assembling and disassembling bus engines. The paper presents the method called ChronFoto_RC which was used to analyse the workstation. Then, the authors proposed to improve the workstation with a specially designed mobile scissor lift. The summary presents the assessment of this solution.

THE INFLUENCE OF THE DIRECTIVITY OF THE GEOMETRIC STRUCTURE ON THE LOAD CAPACITY OF SINGLE-LAP ADHESIVE JOINTS

T

The aim of the work was to investigate the influence of the directivity of the geometric structure obtained in the grinding process on the load capacity of single-lap adhesive joints made of steel S235JR and aluminum alloy 2024-T3. The research was carried out for five different variants of joints differing in the direction of grinding and the arrangement of the ground surfaces to each other. The test results show that in the case of steel joints, the most advantageous solution in terms of joint load capacity is grinding the adhesive surfaces at an angle of 45˚ to the direction of the force loading the joint and connecting them in such a way that the created texture crosses (joint load capacity Pt = 4667.36 N). However, in the case of joints made of aluminum alloy, the best solution is to grind the adhesive surfaces perpendicular to the direction of the force loading the joint (joint load capacity Pt = 3210.46 N). The results of the significant difference test (test-t) show that in the assumed range of variability of the input parameters, the directionality of the geometric structure has a significant impact on the load capacity of the adhesive joints.