Search

The load carrying capacity of designed self-centring permanent magnet based vibro-isolating support is analysed in the article. COMSOL Multiphysics® modelling software was used for nu-merical simulation. Results are presented as repulsion force ver-sus support cap displacement graph as well as magnetic flux density distribution graphs. Repulsion force was also measured experimentally. It is established that differences between numeri-cally and experimentally obtained force values are only about 2-8%. It is established that maximum normal load force of the support can't exceed 150 N. It is also established that near-zero stiffness of the support is achieved in case of approximately 70 N normal load force. [ABSTRACT FROM AUTHOR]

The article investigates the physical processes of plasma spraying. The application of the finite element method has assisted in establishing the distribution of the voltage of the plasma arc and current density in the plasma stream during numerical simulation. With reference to the results of experimental data, the real location of an anode spot of the electric arc in the plasma spray process has been evaluated. The paper has calculated the values of electromagnetic Lorentz forces and established their influence on plasma low. With the help of the two-layer model for the semi-molten nickel particle, contact between the particle and substrate during plasma spraying has been simulated. [ABSTRACT FROM AUTHOR]

The article deals with the problem of transverse acetabular fracture fixation using different plate attachment methods. A 3D model of pelvis and hip joint structure was created and the design of three different fixation plates using SolidWorks was made. The plates were fixed at distances of 10, 20 and 30 mm from the acetabulum. The model was meshed into finite elements, a static external load of 2500 N was added and the analysis of stress distribution in plates and fracture displacement was performed. The obtained results showed that fracture displacement was quite similar in all fixation methods. However, the maximal stress in the nearest from the acetabulum plate was higher than yield strength. Thus, this placement is not eligible. The plate fixed at a distance of 30 mm from the acetabulum appeared the most suitable because of the smallest and symmetrical stress distribution in the plate. [ABSTRACT FROM AUTHOR]

The aim of this study is to analyze the problem of transverse acetabular fracture fixation using finite element analysis (FEA). 3D model of pelvis and hip joint structure was created and the design of fixation plate using SolidWorks was made. The plate was fixed using three different methods: XXOOOOXX, XOXOOXOX, XXXOOXXX (where X is screw and O is empty hole). Model was meshed into finite elements, static external load of 2500 N was added and the analysis of stress distribution and displacement was performed. The results showed that all three methods of fixture fit for transverse acetabular fracture fixation while the XOXOOXOX method appeared most suitable because of the smallest stress distribution and displacement on pelvis bone. [ABSTRACT FROM AUTHOR]

The paper deals with the strength analysis of structural devices (platform bridges) that fasten cars to a car carrier frame. The loads of all bridges are evaluated along with the indication of the areas of load concentration. The paper presents a brief structural description of platform bridges, including their drawings performed with the help of SolidWorks software. The bridge loads have been analyzed applying Ansys software. According to the results of computer simulation of the loads, dangerous structural areas of the bridges have been identified. While making attempts to solve the established structural problems of such car carriers, suggestions for their structural improvement have been put forward, and computer simulation of loads and stress spread have been performed. The paper ends with conclusions and suggestions. [ABSTRACT FROM AUTHOR]

The article describes the possibility of generating a micro and sub-microsecond magnetic impulse reaching 1-10 T, investigates various configurations of microcoils and discusses the principal circuit of a magnetic field impulse generator of microsecond duration. The transient processes of current, temperature and magnetic field are calculated applying the finite element method. [ABSTRACT FROM AUTHOR]

The article analyzes the optimization of grillage-type foundations seeking for the least possible reactive forces in the poles for a given number of poles and for the least possible bending moments of absolute values in the connecting beams of the grillage. Therefore, we suggest using a compromise objective function (to be minimized) that consists of the maximum reactive force arising in all poles and the maximum bending moment of the absolute value in connecting beams; both components include the given weights. The variables of task design are pole positions under connecting beams. The optimization task is solved applying the algorithm containing all the initial data of the problem. Reactive forces and bending moments are calculated using an original program (finite element method is applied). This program is integrated into the optimization algorithm using the "black-box" principle. The "black-box" finite element program sends back the corresponding value of the objective function. Numerical experiments revealed the optimal quantity of points to compute bending moments. The obtained results show a certain ratio of weights in the objective function where the contribution of reactive forces and bending moments to the objective function are equivalent. This solution can serve as a pilot project for more detailed design. [ABSTRACT FROM AUTHOR]