International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

The application of mathematical methods is one of the most rational approaches used to solve tasks of evaluating the efficiency of unconventional metal forming processes. Using computer simulation in the DEFORM-3D application software package, we performed virtual full factorial experiments for the processes of producing individual samples by equal-channel angular pressing (ECAP) and highpressure torsion (HPT) from the Mg-1%Ca magnesium alloy, taking assumptions into account. At the stage of the simulation task preparation, it was accepted that the most significant factors that influence the fabrication of defect-free semi-products by severe plastic deformation (SPD) via ECAP are the processing temperature and the number of processing cycles via route Вс. In both models, strain intensity was taken as the response parameter. To simulate the SPD process of HPT, the processing temperature and the number of revolutions were used as the main variable factors. In the virtual full factorial experiment, the effect of independent factors on strain intensity was evaluated. As a result of the experiments, regression equations were obtained, variants of the rational processing regimes for the investigated alloy were presented, and their effect on the response parameter was analyzed. The proposed and implemented numerical models allow us to recommend the ECAP processing of the Mg-1%Ca magnesium alloy at a deformation speed of 1.0 mm/s and temperature of about 350 °С for 2 – 4 cycles, and the HPT processing under a hydrostatic pressure of 6 GPa at room temperature with the number of revolutions from 3 to 5.

Pneumatic vane motors are important actuators in industry, their optimization is difficult without e best mathematic model and computer simulation. In this article we presents a mathematical model for pneumatic vane type motors, construction of a simulation program associated with constructive engine parameters, experimental confirmation , and pneumatic motor performance optimization based on this model. The article begins with the description of the working principle of the vane type pneumatic motors, the geometric parameters that characterize it. The set of mathematical model equations consists in: the equations of geometry, the equation that describe the rotating moment, and equations expressing the mass flow into the motor. For the construction of the simulation program we have used the programming language of the G type LabView. Matching the results obtained from the simulation with the measured ones experimentally indicate that the built mathematical model is accurate and can be used to optimize pneumatic motors.

Using computer simulat ion in the environment of the DEFORM-3D appl icat ion package, a virtual ful l factorial experiment was conducted on the process of producing long length workpieces from low -al loyed chrome bronze by equal channel angular pressing (ECAP) using the Conform scheme. During the virtual experiment, an assessment was made of the inf luence of independent factors (impel ler rotat ion speed, number of cycles, and temperature of deformat ion treatment) on the response parameter — deformat ion force. As a resul t of the experiment , a regression equat ion was obtained, a variant of solving the opt imizat ion problem wi th determining the numerical values of the accepted independent factors was presented, an d their inf luence on the response parameter was analyzed.

The subject of the paper are linked processes in agriculture. Sophisticated relations between operational and transportation farm practises in time, place, and mass balance need compound simulation based on computer software. Important prerequisites for a good solution is a well-founded land management project. The last one have to include at least proper crop rotation plan and corresponding road net. The different combinations of crop yield, bulk density, distant of transportation for distinct plants require many concrete solutions. Furthermore, transportation can be realized with or without intermediate capacity like buffers, bins, overloader trailers, exchangeable trailers, etc. For fastets harvest, computation are made with maximum number of selfpropeler harvesters or enough to end of crop gather in acceptable periods. In the example, a joint work of Claas Lexion 600 and tractor with 9, 12 and/or 21 tons carrying capacity of trailer are discussed. For easy choice of every concrete solution, additiobnal information can be used like linked processes performans and graphic illustration. The proposed optimal procedure garatees enough data for reasonable solution based on real combinations of technology, machinery, vehicles, intermediate and final capacities.

This paper is focused on numerical analysis of a hydraulic arm for use on a light goods vehicle. The designed arm is used for loading and manipulation with load up to 300 kg. Its load capacity depends on the light goods vehicle to be placed on. Great operability of this mechanism predetermines its wide application, e.g. in construction, transport, business etc. Firstly, analytical calculations of the forces, moments and reactions are introduced. Further, locations and values of the maximum stress in the structure of the designed hydraulic arm are calculated using the FEM software. These results determine the relevant data necessary for correct design functioning of the machine. After carrying out all the analyses and calculations we will be able to determine the safe use of the designed handling machine and put it into operation.

The development of new and modernization of existing methods of plate-rolling in order to obtain high-quality and competitive products is a promising task. This paper presents the results of a comparative analysis of the classical plate rolling technology and new technology, including rolling in relief rolls and workpiece alignment on a smooth barrel followed by rolling to the desired size. Comparison of these technologies was carried out with the help of computer simulation methods in finite element software package SIMUFACT FORMING together with a database of materials properties MATILDA. The analysis was conducted by parameters such as: the degree of elaboration of the workpiece, deformation scheme, the evolution of the microstructure. For comparison, the values of the stresses and deformations of the workpieces to be processed on existing and proposed technologies, studied the stress-strain state using the coefficient Lode-Nadai. Analysis results obtained in the course of the simulation allows to predict better quality plate production with the use of the proposed technology plate rolling.

The motion of a dislocation in Aluminum is considered at room temperature with allowance for the Peierls relief. This study has been accomplished using the methods of mathematical modeling. It was shown by means of numerical experiment that the free path length of dislocation depends on the frequency of applied external elastic field. Here a hardening of crystal took place due to the dynamical losses. In the presence of resonant frequency external alternating elastic field the gradient of hardening curve growth, and therefore, the yield strength, is reduced. It was shown that the regularities of large-scale processes occurring in deformable body may be clarified by means of analyzing the micro processes.

This report presents a software platform that can be used for computer simulation of one of the most dangerous natural disasters. Offers a software product can be used for training by experts on protection of the population and infrastructure.