Papers by Author: Kastytis Slivinskas

Abstract: The paper analyzes problems related to optimal selection and possible control of parameters of transport movements of the manipulator serving galvanizing and quenching baths. Evaluation of the acceleration and braking processes as well as minimization of the deflection during oscillations of the suspended loading are considered. Mathematical models of the transfer manipulator together with the loading unit were developed, which enable dynamic evaluation of transporting movements. Calculations of the dynamics of the model and simulations of the transfer process were performed. The obtained research results allow to improve the quality of the processing and reduce the emission of pollutions.

Abstract: The essence of the considered problem is to improve line scale gauge calibration quality by studying vibrations that are induced during the calibration process. To assess the influence of vibrations it is necessary to solve a lot of scientific and technical tasks. Serious difficulties were confronted during the mathematical analysis - development of analytical model and determination of its coefficients. An in-depth analysis of line scale measurement means had to be performed to this aim, because only experimental measurements enabled to estimate the majority of coefficients.

Abstract: In the paper the method of creating the dynamical model of the mechanical system is considered. The transient process measured after the hammer blow is used as input data. Prony method with its improvements is used for the estimation of unknown parameters of the model. Using the FFT and IFFT procedures the sample data is decomposed into two parts: a high frequency component and a low frequency component. Each part is investigated separately. While the high frequency component was modeled by using a simple six poles model, the low frequency component was modeled by a single multiple pole. The correctness of the model was checked by RMSE criteria. The RMSE of the low frequency component model versus the multiplicity of the pole was investigated. The results show good agreement with experimental data. The full final model was used to get the amplitude-frequency response of the system.

Abstract: The method of creating the dynamical model of the CNC gear hobbing machine and for its analyzing is presented in this paper. The model comprises detail mechanical parts of the hob spindle and work spindle axes, their electrical counterparts, linking, and allows one to investigate dynamic characteristics of the machine and to simulate processes, which take place during gear hobbing. The article also presents the simulation diagram, introducing these axes and the third axis, which help to model the cutting process. It also presents results of simulation of processes during hobbing and amplitude-frequency characteristics calculated.