ISSN: 2067-3809 ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Tome XIV [2021] Fascicule 2 [April–June] Edited by: UNIVERSITY POLITEHNICA TIMISOARA with kindly supported by: THE GENERAL ASSOCIATION OF ROMANIAN ENGINEERS (AGIR) – branch of HUNEDOARA Editor / Technical preparation / Cover design: Assoc. Prof. Eng. KISS Imre, PhD. UNIVERSITY POLITEHNICA TIMISOARA, FACULTY OF ENGINEERING HUNEDOARA Commenced publication year: 2008 ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Tome XIV [2021] | Fascicule 2 [April – June] ASSOCIATE EDITORS and REGIONAL COLLABORATORS MANAGER & CHAIRMAN ROMANIA Imre KISS, University Politehnica TIMISOARA, Faculty of Engineering HUNEDOARA EDITORS from: ROMANIA Dragoș UȚU, University Politehnica TIMI OARA – TIMI OARA Vasile ALEXA, University Politehnica TIMI OARA – HUNEDOARA Sorin Aurel RAŢIU, University PolitehnicaŞ TIMI OARA –Ş HUNEDOARA Vasile George CIOATĂ, University PolitehnicaŞ TIMI OARA – HUNEDOARA Emanoil LINUL, University Politehnica TIMI OARAŞ – TIMI OARA Virgil STOICA, University Politehnica TIMI OARA –Ş TIMI OARA Simona DZIŢAC, University of Oradea – ORADEAŞ Ş Valentin VLĂDUŢ, Institute of Research-DevelopmentŞ for MachinesŞ & Installations – BUCURE TI Mihai G. MATACHE, Institute of Research-Development for Machines & Installations – BUCURE TI Dan Ludovic LEMLE, University Politehnica TIMI OARA – HUNEDOARA Ş Gabriel Nicolae POPA, University Politehnica TIMI OARA – HUNEDOARA Ş Sorin Ștefan BIRIȘ, University Politehnica BUCURESTIŞ – BUCURESTI Stelian STAN, University Politehnica BUCURESTI –Ş BUCURESTI Dan GLĂVAN, University “Aurel Vlaicu” ARAD – ARAD REGIONAL EDITORS from: SLOVAKIA Juraj ŠPALEK, University of ŽILINA – ŽILINA Peter KOŠTÁL, Slovak University of Technology in BRATISLAVA – TRNAVA Tibor KRENICKÝ, Technical University of KOŠICE – PREŠOV Peter KRIŽAN, Slovak University of Technology in BRATISLAVA – BRATISLAVA HUNGARY Tamás HARTVÁNYI, Széchenyi István University – GY R József SÁROSI, University of SZEGED – SZEGED György KOVÁCS, University of MISKOLC – MISKOLCŐ Zsolt Csaba JOHANYÁK, John von Neumann University– KECSKEMÉT Gergely DEZSŐ, University of NYÍREGYHÁZA – NYÍREGYHÁZA Arpád FERENCZ, Pallasz Athéné University – KECSKEMÉT Loránt KOVÁCS, Pallasz Athéné University – KECSKEMÉT Sándor BESZÉDES, University of SZEGED – SZEGED Csaba Imre HENCZ, Széchenyi István University – GY R Zoltán András NAGY, Széchenyi István University – GY R László GOGOLÁK, University of SZEGED – SZEGED Ő Krisztián LAMÁR, Óbuda University BUDAPEST – BUDAPESTŐ Valeria NAGY, University of SZEGED – SZEGED Ferenc SZIGETI, University of NYÍREGYHÁZA – NYÍREGYHÁZA SERBIA Zoran ANIŠIC, University of NOVI SAD – NOVI SAD Milan RACKOV, University of NOVI SAD – NOVI SAD Igor FÜRSTNER, SUBOTICA Tech – SUBOTICA Eleonora DESNICA, University of NOVI SAD – ZRENJANIN Ljiljana RADOVANOVIĆ, University of NOVI SAD – ZRENJANIN Blaža STOJANOVIĆ, University of KRAGUJEVAC – KRAGUJEVAC Slobodan STEFANOVIĆ, Graduate School of Applied Professional Studies – VRANJE Sinisa BIKIĆ, University of NOVI SAD – NOVI SAD Živko PAVLOVIĆ, University of NOVI SAD – NOVI SAD CROATIA Gordana BARIC, University of ZAGREB – ZAGREB Goran DUKIC, University of ZAGREB – ZAGREB BULGARIA Krasimir Ivanov TUJAROV, “Angel Kanchev” University of ROUSSE – ROUSSE Ivanka ZHELEVA, “Angel Kanchev” University of ROUSSE – ROUSSE Atanas ATANASOV, “Angel Kanchev” University of ROUSSE – ROUSSE 3 | Fascicule 2 ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Tome XIV [2021] | Fascicule 2 [April – June] BOSNIA & Tihomir LATINOVIC, University in BANJA LUKA – BANJA LUKA HERZEGOVINA POLAND Jarosław ZUBRZYCKI, LUBLIN University of Technology – LUBLIN Maciej BIELECKI, Technical University of LODZ – LODZ TURKEY Önder KABAŞ, Akdeniz University – KONYAAALTI/Antalya GREECE Apostolos TSAGARIS, Alexander Technological Educational Institute of THESSALONIKI – THESSALONIKI Panagiotis KYRATSIS, Western Macedonia University of Applied Sciences – KOZANI SPAIN César GARCÍA HERNÁNDEZ, University of ZARAGOZA – ZARAGOZA The Editor and editorial board members do not receive any remuneration. These positions are voluntary. The members of the Editorial Board may serve as scientific reviewers. We are very pleased to inform that our journal ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering is going to complete its ten years of publication successfully. In a very short period it has acquired global presence and scholars from all over the world have taken it with great enthusiasm. We are extremely grateful and heartily acknowledge the kind of support and encouragement from you. ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering seeking qualified researchers as members of the editorial team. Like our other journals, ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering will serve as a great resource for researchers and students across the globe. We ask you to support this initiative by joining our editorial team. If you are interested in serving as a member of the editorial team, kindly send us your resume to ISSN: 2067-3809 [email protected]. copyright © University POLITEHNICA Timisoara, Faculty of Engineering Hunedoara, 5, Revolutiei, 331128, Hunedoara, ROMANIA http://acta.fih.upt.ro 4 | Fascicule 2 ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Tome XIV [2021] | Fascicule 2 [April – June] INTERNATIONAL SCIENTIFIC COMMITTEE MEMBERS and SCIENTIFIC REVIEWERS MANAGER & CHAIRMAN ROMANIA Imre KISS, University Politehnica TIMISOARA, Faculty of Engineering HUNEDOARA INTERNATIONAL SCIENTIFIC COMMITTEE MEMBERS & SCIENTIFIC REVIEWERS from: ROMANIA Viorel–Aurel ȘERBAN, University Politehnica TIMI OARA – TIMI OARA Teodor HEPUŢ, University Politehnica TIMI OARA – HUNEDOARA Ilare BORDEAȘU, University Politehnica TIMI OARAŞ – TIMI OARAŞ Liviu MARȘAVIA, University Politehnica TIMIŞ OARA – TIMI OARA Ioan VIDA-SIMITI, Technical University of CLUJŞ -NAPOCA – ŞCLUJ-NAPOCA Csaba GYENGE, Technical University of CLUJ-ŞNAPOCA – CLUJŞ -NAPOCA Sorin VLASE, “Transilvania” University of BRASOV – BRASOV Horatiu TEODORESCU DRĂGHICESCU, “Transilvania” University of BRASOV – BRASOV Maria Luminița SCUTARU, “Transilvania” University of BRASOV – BRASOV Carmen ALIC, University Politehnica TIMI OARA – HUNEDOARA Liviu MIHON, University Politehnica TIMI OARA – TIMI OARA Ş SLOVAKIA Ervin LUMNITZER, Technical University of KOŠICE – KOŠICE Ş Ş Miroslav BADIDA, Technical University of KOŠICE – KOŠICE Juraj ŠPALEK, University of ŽILINA – ŽILINA Karol VELIŠEK, Slovak University of Technology BRATISLAVA – TRNAVA Imrich KISS, Institute of Economic & Environmental Security – KOŠICE Vladimir MODRAK, Technical University of KOSICE – PRESOV CROATIA Drazan KOZAK, Josip Juraj Strossmayer University of OSIJEK – SLAVONKI BROD Predrag COSIC, University of ZAGREB – ZAGREB Milan KLJAJIN, Josip Juraj Strossmayer University of OSIJEK – SLAVONKI BROD Antun STOIĆ, Josip Juraj Strossmayer University of OSIJEK – SLAVONKI BROD Ivo ALFIREVIĆ, University of ZAGREB – ZAGREB HUNGARY Imre DEKÁNY, University of SZEGED – SZEGED Cecilia HODÚR, University of SZEGED – SZEGED Béla ILLÉS, University of MISKOLC – MISKOLC Imre RUDAS, Óbuda University of BUDAPEST – BUDAPEST István BIRÓ, University of SZEGED – SZEGED Tamás KISS, University of SZEGED – SZEGED Imre TIMÁR, University of Pannonia – VESZPRÉM Károly JÁRMAI, University of MISKOLC – MISKOLC Ádám DÖBRÖCZÖNI, University of MISKOLC – MISKOLC György SZEIDL, University of MISKOLC – MISKOLC Miklós TISZA, University of MISKOLC – MISKOLC József GÁL, University of SZEGED – SZEGED Ferenc FARKAS, University of SZEGED – SZEGED Géza HUSI, University of DEBRECEN – DEBRECEN BULGARIA Kliment Blagoev HADJOV, University of Chemical Technology and Metallurgy – SOFIA Nikolay MIHAILOV, “Anghel Kanchev” University of ROUSSE – ROUSSE Stefan STEFANOV, University of Food Technologies – PLOVDIV SERBIA Sinisa KUZMANOVIC, University of NOVI SAD – NOVI SAD Zoran ANIŠIC, University of NOVI SAD – NOVI SAD Mirjana VOJINOVIĆ MILORADOV, University of NOVI SAD – NOVI SAD Miroslav PLANČAK, University of NOVI SAD – NOVI SAD ITALY Alessandro GASPARETTO, University of UDINE – UDINE Alessandro RUGGIERO, University of SALERNO– SALERNO Adolfo SENATORE, University of SALERNO– SALERNO Enrico LORENZINI, University of BOLOGNA – BOLOGNA 5 | Fascicule 2 ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering Tome XIV [2021] | Fascicule 2 [April – June] BOSNIA & Tihomir LATINOVIC, University of BANJA LUKA – BANJA LUKA HERZEGOVINA Safet BRDAREVIĆ, University of ZENICA – ZENICA Zorana TANASIC, University of BANJA LUKA – BANJA LUKA Zlatko BUNDALO, University of BANJA LUKA – BANJA LUKA Milan TICA, University of BANJA LUKA – BANJA LUKA Strain POSAVLJAK, University of BANJA LUKA – BANJA LUKA MACEDONIA Valentina GECEVSKA, University “St. Cyril and Methodius” SKOPJE – SKOPJE Zoran PANDILOV, University “St. Cyril and Methodius” SKOPJE – SKOPJE GREECE Nicolaos VAXEVANIDIS, University of THESSALY – VOLOS PORTUGAL João Paulo DAVIM, University of AVEIRO – AVEIRO Paulo BÁRTOLO, Polytechnique Institute – LEIRIA José MENDES MACHADO, University of MINHO – GUIMARÃES SLOVENIA Janez GRUM, University of LJUBLJANA – LJUBLJANA Štefan BOJNEC, University of Primorska – KOPER POLAND Leszek DOBRZANSKI, Silesian University of Technology – GLIWICE Stanisław LEGUTKO, Polytechnic University – POZNAN Andrzej WYCISLIK, Silesian University of Technology – KATOWICE Antoni ŚWIĆ, University of Technology – LUBLIN Aleksander SŁADKOWSKI, Silesian University of Technology – KATOWICE AUSTRIA Branko KATALINIC, VIENNA University of Technology – VIENNA SPAIN Patricio FRANCO, Universidad