Analysis of the Laser Forming of Shaped Surfaces Using the Adaptive Neuro-fuzzy Technique

Three-dimensional (3-D) shape modelling from a flat sheet by lasers needs numerous irradiations along surface paths with different parameters of heating. In this study it was attempted to form a three-dimensional shaped surface by laser. The main aim of the study was to analyse the impact of various machining parameters like laser power, scan speed and spot diameters on the surface modelling process. Adaptive neuro-fuzzy inference system (ANFIS) and variable selection procedure was used in order to determine the parameters influence on the surface heights prediction. The selection procedure was done to obtain the found the process parameters which has the highest influence on the surface heights. The method can produce results to simplify the surface heights prediction

Analysis of the Laser Forming of Shaped Surfaces Using the Adaptive Neuro-fuzzy Technique

Three-dimensional (3-D) shape modelling from a flat sheet by lasers needs numerous irradiations along surface paths with different parameters of heating. In this study it was attempted to form a three-dimensional shaped surface by laser. The main aim of the study was to analyse the impact of various machining parameters like laser power, scan speed and spot diameters on the surface modelling process. Adaptive neuro-fuzzy inference system (ANFIS) and variable selection procedure was used in order to determine the parameters influence on the surface heights prediction. The selection procedure was done to obtain the found the process parameters which has the highest influence on the surface heights. The method can produce results to simplify the surface heights prediction

Determination of power losses in worm gear reducer

© 2018 Institute of Physics Publishing. All rights reserved. In this paper are presented the power losses and sources of their occurrence in worm gear reducer. These are the losses that occur in the coupling of worm teeth and worm gear, losses in bearings, seals and oil churning power losses in the transmission. Power losses are determined for the actual model of worm gear reducer, on the specialized testing device AT200 at the Center for testing power transmission at the Faculty of Engineering in Kragujevac, Serbia. The total losses are determined for different values of input number of revolution, output torque and by variation of types of oil, according to the pre-defined experiment plan. The aim of the paper is an experimental proof of theoretical assumptions of the influence of various factors on losses in the worm gear reducer

Experimental determination of worm gearing efficiency

© 2019 Published by the Serbian Academic Center. This paper deals with the analysis of impact of various factors on power loss and efficiency of worm gearing. Factors that significantly affect the power losses are, principally, types of materials of meshed gears and geometry of worm pair, type and viscosity of lubricating oils, input rotational speed, worm shape, loading, temperature, etc. Results of experimental tests of worm gearing efficiency are also presented in the paper. Tests were conducted according to planned experiment schedule on specialized device AT200, where single-stage worm gearboxes with transmission ratio i=18 has been used. During the test stage, oils of different viscosities (ISOVG 220, ISOVG 460 and ISOVG 680) have been used and their impact on efficiency was monitored. The values of efficiency level are determined at different input rotational speeds (circumferential velocity) and output torques (loads)

Examination of wear resistance of polymer-basalt composites

Olivine basalt, as a natural material, has excellent physical and mechanical properties such as hardness, compressive strength, wear resistance, color and gloss. On the other hand it is difficult for processing, because of its high values of mechanical properties. Retention of physical and mechanical properties of basalt and its formation is only possible by mixing basalt powder with polymers, which would enable the composite material that can be formed by the casting process into complex shapes. The mechanical properties of the obtained composites and production technologies are, to a great extent, unknown in both, local and foreign literature. Researches conducted and presented in this paper show an overview of tribological behavior of the basaltic composite material, and some technological parameters of the production process. Based on the obtained results, it can be determine the best ratio of components in the composite. These data are important for the development of new composite materials based on basalt, which will have significant application in the future