The decision-making process in the stage of technical preparation, during the planning of logistic portfolio and production queries is marked by individual decisions that may be affected by errors causing in extreme cases the fatal consequences. The tools of computer simulation help to eliminate the negative effects of bad decision-making. This article describes the usage of computer simulation in process of optimization of material flow using an appropriate spatial deployment of production facilities. The triangular method was used for the optimization of the spatial deployment. The factors to create the triangular method were obtained from the final report of the simulation of the current production state in the assessed facility. Subsequently a simulation of the proposed optimization variants was conducted. Based on the selected criteria, the most suitable alternative was chosen for the enterprise.

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The paper deals with the influence of gear weight reduction on its modal properties. The aim of thepaper is to use the simulation tools to introduce the dependence of natural frequencies on the change in the shape of the gear, which is reflected in the change in weight. At the beginning of the paper, the theory and experimental bases of vibration testing and analysis are introduced to understand the principles of modal parameter specification. Verification of the boundary conditions used in the simulation was performed using the experimental method and it is described in the next part of the article. Tests confirmed the consistency of the values achieved by both approaches. Thus, the same boundary conditions could be used to specify the dependence of natural frequencies on the change in the geometry ofthe gear (which is associated with weight reduction). Numerical analysis was performed by FEM analysisusing PTC Creo software. Experimental modal analysis was performed using a PULSE measurement system.

Abstract. 3D printing is currently growing very rapidly and it allows to produce structurally complex elements consisting of one or more parts. 3D printing technique delivers some problems which are necessary to solve. The article deals with the hardness and surface roughness investigation of a component produced by direct metal laser sintering technology. The goal of the research was to study the influence of a surface orientation on observed parameters mentioned above. The tested sample was designed as a complex part that includes many geometrical features, which can also influence properties of a product. The part was produced from maraging steel 1.2709. Executed preliminary tests have shown that the obtained values differ, what indicates that there are effects of manufacturing conditions on the product quality. Next experiments will be performed to specify the impact degree of individual factors.

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