38 research outputs found

    The Place of 3D Printing in the Manufacturing and Operational Process Based on the Industry 4.0 Structure

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    The article presents the place of 3D printing in the manufacturing and operational process. It analyzes selected incremental technologies in the product life cycle. It describes selected processes for testing the properties of materials used in 3D printing, including accelerated aging tests and simulation of operating conditions. Areas of application of 3D printing were defined, starting from design and prototype development through manufacturing of technological tools and finally finished products. Design criteria of additivelymanufactured elements in relation to the exploitation process are discussed. A methodology for the development of 3D-CAD models of manufactured elements, software processing of data and data storage format for manufacturing products and spare parts is presented. The assumptions of repair procedures based on the production of spare parts by means of 3D printing in relation to data circulation compatible with the idea of Industry 4.0 structure have been adopted

    Modelling of the injection and combustion processes in the gasoline direct injection engine

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    Rad prikazuje modeliranje procesa ubrizgavanja pomo─çu KIVA programa. Slo┼żeni matemati─Źki modeli koji se koriste u izra─Źunima i koji opisuju procese koji se odvijaju unutar cilindra motora omogu─çuju generiranje kompliciranih virtualnih modela koji odra┼żavaju stvarne uvjete na zadovoljavaju─çi na─Źin. To─Źnost rezultata prora─Źuna odre─Ĺena je kvalitetom ulaznih podataka, koji se mogu dobiti na temelju ispitivanja s modelom. Na temelju modeliranja procesa ubrizgavanja i izgaranja u GDI motoru, predstavljenih u radu, dobivena je osnova za ┼íiru analizu plinsko-dinami─Źkih pojava.The paper presents modelling of the injection process by means of KIVA program. The elaborate mathematical models used in calculations describing the processes occurring inside the engine cylinder make it possible to create complicated virtual models reflecting real conditions in a satisfactory way. The accuracy of calculation results is determined by the quality of input data, which can be obtained based on model investigations. Based on the modeling of injection and combustion processes in the GDI engine, presented in the work, the basis for a broader analysis of the gas-dynamic phenomena was obtained

    MODELLING AND TESTING OF DYNAMIC PROPERTIES OF C0-45 TURBOCHARGERS

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    The paper presents modelling process and results of the bench tests of the C0-45, which is a turbocharger for heavy-duty diesel engines. For turbochargers like this, it is necessary to measure the level of vibration. This paper presents the test results for 115 turbochargers. Rotor speed during the tests varied between 25,000 and 42,000 rpm. Rotor speed during the tests on a C0-45 turbocharger varied within three ranges, i.e., Range I: n=25,000-32,000 rpm and a=0.5g; Range II: n=33,000-38,000 rpm and a=1.0g; Range III: n=39,000-42,000 rpm and a=1.5g; (g=9.81m/s2). Measurement of vibrations was realized by a sensor located on the body of the turbocharger. Bench tests also included measurement of key charge parameters such as the amount of mass trapped, mean flow velocities, turbulence level, gas pressure, temperature and oil flow. The results are presented in the form of diagrams showing the amplitude of the acceleration function with regard to the rotorÔÇÖs RPM. Research shows that using the correct parameters in construction and technological processes of assembly are very important for the effective functioning turbochargers
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