30 articole găsite pentru „Simulations”.
-
OPTIMISATION OF LOSSES IN ASYNCHRONOUS MOTORS FOR GENERAL USE
Prof. Eng. Ion VLAD PhD, Prof. Eng. Aurel CAMPEANU PhD, Prof. Eng. Sorin ENACHE PhD, Lecturer Eng. Gabriela PETROPOL PhD
Proiectarea optimala a motoarelor asincrone reprezinta un proces de cautare si selectare a unei masini electrice care sá corespundá unui criteriu stabilit si anumitor conditii restrictive impuse. Simularile, numeroase si semnificative care se fac, aduc info…
-
REDUCTION OF THE STARTING LOSSES FOR THE WOUND ROTOR INDUCTION MOTOR
Prof. Eng. Sergiu IVANOV, PhD
In actionarile grele (sute de kW), inca sunt utilizate motoarele asincrone cu rotor bobinat. In ciuda simplitatii reglarii vitezei pe caracteristici reostatice, pierderile importante aferente metodei, mai ales la viteze mici, fac ca facilitate sa fie utiliza…
-
TWO-PHASE INDUCTION M ACHINE WITH TOROIDAL WINDING AND IMPROVED PERFORMANCE
PhD Student Eng. Ana-Maria MIHAI, Prof. Eng. Alecsandru SIMION, PhD Eng. Sorin MIHAI, Assoc. Prof. Eng. Leonard LIVADARU , Assis. Prof. Eng. Adrian MUNTEANU PhD
In aceasta lucrare se propune o solutie originala in scopul ameliorarii performantelor masinii asincrone bifazate,prin eliminarea armonicii spatiale de ordinul trei din spectrul campului din intrefier. In acest scop, este utilizata tehnica infasurarii in inel…
-
ATP ANALYSIS OF TRANSMISSION LINES BEHAVIOUR ON DIRECT LIGHTNING STROKES
Prof. Eng. Marcel Istrate, PhD, Assist. Prof. Eng. Dragos Machidon
Lucrarea abordeaza comportarea liniilor aeriene de 400 kV la lovituri directe de trasnet. Regimurile tranzitorii generate de lovituri directe de trasnet in elementele liniilor sunt analizate cu ajutorul simularilor in ATP-EMTP. Conturnarea izolatoarelor a fo…
-
IMPACT EVALUATION OF DIRECT LIGHTNING STRIKE ON A TOWER. GROUND POTENTIAL RISE ALTERNATIVE COMPUTATIONS
Dr. Andrei CECLAN, Prof. Dr. Eng. Vasile TOPA , Assoc. Prof. Dr. Eng. Dan Doru MICU, PhD. Stud. Levente CZUMBIL
Orice structura metalica, in special cele inalte de telecomunicatii, turnuri eoliene sau alt tip de turnuri metalice pot servi ca si canale de descarcare pentru curenti de trasnet de ordinul sutelor de kA si astfel sa conduca la aparitia unor potentiale ele…
-
ENERGY SECURITY THREAT SCENARIOS FOR REDUCING LOAD CHP-1 AND CHP -2 MOLDAVIAN POWER SYSTEM
Elena BICOVA, PhD, Vitaly POSTOLATY, ac., Mihail GRODETSKII, eng. - Rep. Moldova
Aceasta lucrare prezinta modelarea de scenarii de amenintari de securitate energetica pentru sistemul energetic al Moldovei, care apar in timpul off-CET 1 si CET-2 de reducere a si-o singura etapa a sarcinii.
-
PERMANENT MAGNET SYNCHRONOUS MACHINES WITH HALBACH ARRAY CONFIGURATIONS – A F.E.M. APPROACH
Leonard LIVADARU, Florin LAZAR, Alecsandru SIMION, Adrian MUNTEANU, Adrian MALANCIUC, Sorin VLASCEANU
Utilizarea configuratiilor Halbach in constructia masinilor de curent alternativ cu magneti permanenti constituie o solutie relativ noua ce urmareste imbunatatirea performantelor si, mai nou, eliminarea fierului din anumite zone ale circuitului magnetic clas…
-
CONSIDERATIONS ON THE USE OF FLUX 2D SOFTWARE FOR THE ANALYSIS OF THE DEFECTS IN POWER TRANSFORMERS
Tiberiu-Octavian CUJBA
Pornind de la defectarile transformatoarelor electrice de putere, observate pe parcursul exploatarii acestora, am abordat aceata problema pe baza unor simulari efectuate pe calculator. Analiza defectelor la un transformator de putere cu ajutorul programului F…
-
SOME ASPECTS REGARDING STRESS WAVE PROPAGATION IN TRONCONICAL SHORT BARS WITH VARIABLE ANGLE
Nicolae ILIESCU, Vasile NĂSTĂSESCU, Costică ATANASIU
In the first part of the paper an algorithm of calculus, using FEM, developed by the authors in a previous paper, is presented. This computational algorithm was applied in the study of stresses wave propagation produced by an axial impact in a tronconical sho…
-
NEW RESEARCH ON COMPOSITE MATERIALS AT THE METAL FORMING RESEARCH CENTRE
Claudia GÎRJOB, Octavian BOLOGA, Gabriel RACZ, Cristina BIRIS
The Metal Forming Research Centre functions as separate research unit within "Lucian Blaga" University of Sibiu, Romania. This is one of the first centres of its kind in Romanian higher education system and emerged under the aegis of the European inter-univer…