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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Manipuliatoriaus pavaros su elektroreologiniu skysčiu kūrimas ir tyrimas / Research and development of manipulator drive with electrorheological fluid

Varnavičius, Vytis 26 July 2005 (has links)
The research object of this work is to investigate implementation of ERF in manipulators drive systems and independent actuation of manipulator elements by one actuator – electrorheological fluid. In order to achieve these goals the following issues has to be considered in this work: theoretical and experimental investigation on ERF working modes in array and planar manipulators drives; development of principal design schemes of manipulator drive based on ERF; design and analysis of dynamic models of array and planar manipulators drives; research on advantages and disadvantages of using controllable fluids in thin layers of electrodes of manipulator drives.
2

Asinchroninio variklio ir dažnio keitiklio pavaros energetinių rodiklių tyrimas / The research on power paremeters of variable speed AC drive

Astrauskas, Tomas 17 June 2005 (has links)
The theme of Master project of Energetics engineer is to analyze the power paremeters of noncontrollable speed AC drive. Is to analyze the power paremeters of variable speed AC drive. Is to accomplish the power paremeters of variable and noncontrollable speed AC drive. Describe the results of investigate and render the respective findigs.
3

Konvejerio modeliavimas ir tyrimas / Modeling and Investigation of conveyor

Mozūras, Gediminas 16 August 2007 (has links)
Darbe nagrinėjamas juostinio konvejerio skaldos transportavimui projektavimas naudojant šiuolaikinę kompiuterinio projektavimo įrangą. Suprojektuotas ir sumodeliuotas SolidWorks kompiuterinio projektavimo sistemoje juostinis konvejeris skaldos transportavimui. Atliktas konvejerio laikančiųjų konstrukcijų stiprumo tyrimas, nustatyta, kad jų stiprumas pakankamas. Konvejerio pavara suprojektuota ir jos komponentų stiprumo tyrimai atlikti APM WinMashine programinio paketo pagalba. Pagrindinio konvejerio pavaros veleno stiprumo tyrimas parodė, kad jis yra tinkamas dirbti maksimalaus apkrovimo sąlygomis. Atlikti darbai parodė, kad naudojant kompiuterizuoto projektavimo sistemą SolidWorks, projektuose sumažėja klaidų skaičius, bei padidėja projektų atlikimo sparta. / The development of belt conveyor for transportation of macadam, using modern computer aided design (CAD), is analysed in the work. The conveyor was developed and modeled using CAD software SolidWorks. The analysis of the strength of conveyor frame was performed, it was rated that the strength of the frame is sufficient. The drive of the conveyor was developed and the analysis of the strength of its components was performed using APM WinMashine software. The analysis of the main conveyor shaft showed that it is suitable for operation under the conditions of maximum load. The performed works showed that using CAD system SolidWorks, number of design errors and design time decreases.
4

Daugiafunkcinių dvikoordinačių vykdymo sistemų valdymas / Control of multifunctional two-coordinate drive systems

Blažiūnas, Giedrius 19 July 2005 (has links)
The research object is to develop and investigate methods and algorithms for fmleexthiboldes ,c othnetr oplr oobfl etmwso -ocfo osradviinnagt ea nddri vrea tisoynsatel mhas.n dAlipnpgl inogf edneevreglyo,p eeqdu cipomnternotl and global material resources have to be investigated in cases of two dimensional positioning and scanning processes under circumstances omaximal.
5

Tiesiaeigių asinchroninių variklių nesimetrinių režimų tyrimas / Investigation Into Non-Symmetrical Modes Of Linear Induction Motors

Lisauskas, Saulius 11 January 2007 (has links)
Linear induction motors are applied in equipments with different requirements set up to the controlled motion parameters. Investigation of motoring and breaking modes remains the relevant problem nowadays. The scientific novelty is based on analysis of non-symmetrical operation modes of linear induction motor at supplying it by a voltage source, developing a generalized model of motoring and breaking dynamic modes and analyzing influence of linear motor windings connection way and control parameters on dynamic breaking characteristics. The coordinate transformations of linear induction motors dynamic models, based on rotational motor with assumptions valid for low speed motor and multi-pole motor, are considered. Mathematical and computer models to investigate symmetrical dynamic modes of linear induction drives are presented. Generalized model to investigate non-symmetrical dynamics modes is elaborated. The results of simulation are presented by dependences on the main variables in the time domain, and dependences on both constructional and control parameters that give possibility to optimize constructional parameters of motors.
6

Tiesiaeigių asinchroninių variklių nesimetrinių režimų tyrimas / Investigation Into Non-Symmetrical Modes Of Linear Induction Motors

Lisauskas, Saulius 17 January 2007 (has links)
Linear induction motors are applied in equipments with different requirements set up to the controlled motion parameters. Investigation of motoring and breaking modes remains the relevant problem nowadays. The scientific novelty is based on analysis of non-symmetrical operation modes of linear induction motor at supplying it by a voltage source, developing a generalized model of motoring and breaking dynamic modes and analyzing influence of linear motor windings connection way and control parameters on dynamic breaking characteristics. The coordinate transformations of linear induction motors dynamic models, based on rotational motor with assumptions valid for low speed motor and multi-pole motor, are considered. Mathematical and computer models to investigate symmetrical dynamic modes of linear induction drives are presented. Generalized model to investigate non-symmetrical dynamics modes is elaborated. The results of simulation are presented by dependences on the main variables in the time domain, and dependences on both constructional and control parameters that give possibility to optimize constructional parameters of motors.

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