20th Edition
PROCEEDINGS OF INTERNATIONAL CONFERENCE OF HYDRAULICS, PNEUMATICS, TOOLS, SEALING ELEMENTS, FINE MECHANICS, SPECIFIC ELECTRONIC EQUIPMENT & MECHATRONICS HERVEX 2012
PARTNERS
Magazine of HYDRAULICS, PNEUMATICS, TRIBOLOGY, ECOLOGY, SENSORICS, MECHATRONICS
ISSN 1454 - 8003 Proceedings of 2012 International Conference of Hydraulics and Pneumatics - HERVEX 7 - 9 November, Calimanesti-Caciulata, Romania
COMMITTEES
HONORARY COMMITTEE
Etienne PIOT – President of European Fluid Power Committee - CETOP John SAVAGE – Vice President CETOP – Education / BFPA Chairman Education and Training, England Henryk CHROSTOWSKI - Wroclaw University of Technology, POLAND Hubertus MURRENHOFF - Institute for Fluid Power Drives and Controls at Aachen University , GERMANY
ORGANIZING COMMITTEE
COORDINATED BY Dipl.Eng. Gheorghe RIZOIU - General Manager of Chamber of Commerce and Industry Valcea, Romania Dr. Ing. Corneliu CRISTESCU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Assoc.Prof. PhD.Eng. Erol MURAD - “POLITEHNICA” University of Bucharest, Romania Prof. PhD. Eng. Dan OPRUTA – Technical University of Cluj, Romania Assoc.Prof. PhD.Eng. Constantin CHIRITA - Technical University “Gheorghe Asachi”- Iasi, Romania Prof. PhD. Eng. Ilare BORDEAŞU - Politehnica University from Timisoara, Romania PhD. Eng. Elmar DORGELOH – Manager of Development and Assessment Institute in Waste Water Technology at RWTH Aachen University, Germany PhD. Eng. Krzysztof KEDZIA - Wroclaw University of Technology, POLAND
MEMBERS PhD.Eng. Mohamed HAJJAM – University of Poitiers - IUT Angouléme France Prof. PhD.Eng. Nicolae ALEXANDRESCU - “POLITEHNICA” University of Bucharest, Romania Eng. Ionel ANDREI - Romanian Ministry of Education, Research and Innovation Assoc.Prof. PhD.Eng. Constantin RANEA - General Secretary - National Authority for Scientific Research from Romania (NASR) Dipl.Eng. Radu ALEXANDRU - FESTO S.R.L. Prof. PhD.Eng. Valeriu BANU - S.M.C. Romania PhD.Eng. Zygmunt DOMAGALA – Wroclaw University of Technology, POLAND 6 ISSN 1454 - 8003 Proceedings of 2012 International Conference of Hydraulics and Pneumatics - HERVEX 7 - 9 November, Calimanesti-Caciulata, Romania
PhD.Eng. Amadio BOLTZANI - ASSOFLUID – Italy PhD.Eng. Gabriela MATACHE - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Dipl.Eng. Marius BURLANESCU - S.C. HERVIL Ramnicu Valcea, Romania
Prof. PhD.Eng. Doru CALARASU - Technical University “Gheorghe Asachi”- Iasi, Romania Dipl.Eng. Ioan CAMPEAN - S.C. HIDROSIB S.A. Sibiu, Romania PhD.Eng. Tudor CRACIUNOIU - S.C. ICTCM S.A. Bucharest, Romania Dipl.Eng. Mircea DANCIU - PARKER HANNIFIN Corporation Romania
Prof. PhD.Eng. Gheorghe GHEORGHE - General Manager - National Institute of Research and Development in Mechatronics and Measurement Technique (INCDMTM), Bucharest, Romania Prof. PhD.Eng. Vasile JAVGUREANU - Technical University of Chisinau Moldova PhD.Eng. Ioan LEPADATU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Dipl.Eng. Leopold LUPUSANSCHI- S.C. CEROB S.R.L. Bucharest, Romania Prof. PhD.Eng. Pavel MACH – Technical University of Praga, Czech PhD.Eng. Daniel MARIN- S.C. General Fluid S.A. Bucharest, Romania PhD.Eng. Adrian MIREA – SC ROMFLUID SA, Bucharest, Romania Dipl.Eng. Ioan MOLDOVEANU - Festo S.R.L.,Bucharest, Romania
PhD.Eng. Andrei Drumea - “POLITEHNICA” University of Bucharest, Romania Prof. PhD.Eng. Johann NICOLICI - Technical University of Viena, Austria Dipl.Eng. Cristian Sen - SUSZI - INDUSTRIAL SRL Constanta, Romania Prof. PhD.Eng. Petru PATRUT - Technical University of Civil Engineering of Bucharest, Romania PhD.Eng. Ion PIRNA - General Manager - National Institute Of Research - Development for Machines and Installations Designed to Agriculture and Food Industry – INMA, Bucharest- Romania PhD.Eng. Mircea PRICOP- S.C. HESPER S.A. Bucharest- Romania Dipl.Eng. Petru BREAZ - HIDRAULICA U.M. PLOPENI – Plopeni, Romania
Prof. PhD.Eng. Liviu VAIDA - Technical University of Cluj, Romania
Prof. PhD.Eng. Nicolae VASILIU - “POLITEHNICA” University of Bucharest, Romania Dipl.Eng. Nicolae TASU - HANSA FLEX Romania
Prof.PhD.Eng. Paul SVASTA - “POLITEHNICA” University of Bucharest, Romania
Phd.Eng. Catalin DUMITRESCU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Prof. PhD.Eng. Kallita WLODZIMIERZ – Faculty of Rezjow – Poland Assoc.Prof.PhD. Marian KRÁLIK - University of Technology in Bratislava - Slovakia
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EXECUTIVE COMMITTEE Dipl.Eng. Valentin CISMARU - President of Chamber of Commerce and Industry Valcea, Romania PhD.Eng. Petrin DRUMEA – Manager - Hydraulics and Pneumatics Research Institute in Bucharest, Romania PhD. Eng. Elmar DORGELOH – Manager of Development and Assessment Institute in Waste Water Technology at RWTH Aachen University, Germany Assoc.Prof. PhD.Eng. Constantin CHIRITA - Technical University “Gheorghe Asachi”- Iasi, Romania Prof. PhD.Eng. Alexandru MARIN – “POLITEHNICA” University of Bucharest, Romania PhD.Eng. Adrian MIREA – General Secretary – Association FLUIDAS, Bucharest - Romania Dipl.Eng. Gheorghe RIZOIU - General Manager of Chamber of Commerce and Industry Valcea, Romania PhD.Eng. Corneliu CRISTESCU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania PhD.Eng. Zygmunt DOMAGALA - Wroclaw University of Technology, Poland Prof. PhD. Eng. Liviu VAIDA – Technical University of Cluj Napoca, Romania PhD. Eng. Gabriela MATACHE - Hydraulics and Pneumatics Research Institute in Bucharest, Romania
SECRETARY Valentin MIROIU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania PhD.Eng. Iulian DUTU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Lorena MATEESCU - Chamber of Commerce and Industry Valcea, Romania
EXCHIBITION ORGANIZING COMMITTEE Lorena MATEESCU - Chamber of Commerce and Industry Valcea, Romania PhD.Eng. Ioan LEPADATU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania
SPECIALIZED REVIEWER COMMITTEE
PhD.Eng. Heinrich Theissen - Institute for Fluid Power Drives and Controls, Aachen University - Germania PhD.Eng. Petrin DRUMEA - Manager - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Assoc.Prof. PhD.Eng. Constantin RANEA - General Secretary - National Authority for Scientific Research from Romania (NASR) Prof. PhD.Eng. Nicolae ALEXANDRESCU - Politehnica University of Bucharest, Romania Prof. PhD.Eng. Paul SVASTA - Politehnica“POLITEHNICA” of Bucharest, Romania 8 ISSN 1454 - 8003 Proceedings of 2012 International Conference of Hydraulics and Pneumatics - HERVEX 7 - 9 November, Calimanesti-Caciulata, Romania
PhD. Eng. Costinel POPESCU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania PhD. Eng. Krzysztof KEDZIA - Wroclaw University of Technology, Poland PhD.Eng. Mohamed HAJJAM - University of Poitiers - IUT Angouléme, France Prof. PhD.Eng. Vasile JAVGUREANU - Technical University of Chisinau, Moldova Prof. PhD.Eng. Pavel MACH - Technical University of Praga, Czech Prof. PhD.Eng. Johann NICOLICS - Technical University of Viena, Austria
MANAGER OF PUBLICATION - PhD.Eng. Petrin DRUMEA - Manager - Hydraulics and Pneumatics Research Institute in Bucharest, Romania
EDITORIAL STAFF Chief Editor - PhD. Eng. Gabriela MATACHE - Hydraulics and Pneumatics Research Institute in Bucharest, Romania Executive Editors - Ana-Maria POPESCU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania - Valentin MIROIU - Hydraulics and Pneumatics Research Institute in Bucharest, Romania
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CONTENTS
SECTION I: INDUSTRIAL HYDRAULICS AND MECHATRONICS
• MODERN TRENDS OF SUSTAINABILITY RELATED RESEARCH IN FLUID POWER Hubertus Murrenhoff – Executive Director of Institute for Fluid Power Drives and Controls – IFAS, Aachen, GERMANY 15 - 55 • HYDRAULIC SWITCHING CONTROL – OBJECTIVES, CONCEPTS, CHALLENGES AND POTENTIAL APPLICATIONS Rudolf Scheidl, Helmut Kogler, Bernd Winkler- Institute of Machine Design and Hydraulic Drives, AUSTRIA 56 - 67 • MAINTENANCE OF FLUID POWER EQUIPMENTS Corneliu Cristescu, Krzysztof Kedzia, Catalin Dumitrescu, Radu Radoi - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA / Wroclaw University of Technology, POLAND 68 - 76 • SOME ASPECTS OF THE NEW MODEL OF ROBOT ACTUATION – MERO Ion Ion, Alexandru Marin, Laura-Florenta Boanta, Cristian Simion, Cornel Dinu – “POLITEHNICA” University of Bucharest, ROMANIA 77 - 86 • REHABILITATION AND TESTING OF AXIAL PISTON AND ADJUSTABLE FLOW HIGH-WEAR PUMPS Petrica Krevey, Radu Sauciuc, Genoveva Vranceanu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 87 – 93 • THE VISION-BASED MECHATRONIC SYSTEMS USED IN PRODUCTION QUALITY CONTROL OF HYDRAULIC COMPONENTS Anca Atanasescu, Sorin Sorea, Alexandru Constantinescu – National Institute of Research and Development in Mechatronics and Measurement Technique in Bucharest-ROMANIA 94 – 102 • NUMERICAL SIMULATION OF THE SERVO MECHANISM FOR ADJUSTING THE CAPACITY OF THE RADIAL PISTON PUMPS Cătălin Dumitrescu, Liliana Dumitrescu, Ioan lepădatu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 103 – 108 • DESIGN AND DEVELOPMENT OF MECHATRONIC SYSTEM WITH TELEMONITORING AND PREDICTIVE TELEMAINTENANCE CONTROL Anghel Constantin , Sergiu Dumitru - National Institute of Research and Development in Mechatronics and Measurement Technique in Bucharest-ROMANIA 109 – 116 • MECHATRONIC SYSTEM FOR WINDING ROLLED WIRE Ioana Ilie, Marian Blejan, Constantin Ranea - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA / “POLITEHNICA” University of Bucharest, ROMANIA 117 – 120 • SCIENTIFIC STRATEGIES AND METHODS OF ADAPTRONICS APPROACH, AS KEY TECHNOLOGY FOR FUTURE Gheorghe Gheorghe - National Institute of Research and Development in Mechatronics and Measurement Technique in Bucharest-ROMANIA 121 – 130 • FLOW ASPECTS THROUGH HYDRAULIC RESISTANCES Ioana Sfârlea, Florin Bode, Dan OpruȚa – Technical University of Cluj-Npoca, ROMANIA 131 - 134 • THE CONSTRUCTIVE-FUNCTIONAL STRUCTURE OF THE MODEL SLOW RUNNING ROTATIONAL HYDRAULIC MOTOR Laura Grama, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 135 - 139 • ROTATIONAL SPEED MATHEMATICAL MODEL OF THE ALTERNATING FLOW DRIVEN THREE-PHASE HYDRAULIC MOTORS Ioan-Lucian Marcu, Daniel-Vasile Banyai, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 140 – 145 • MEANS AND METHODS FOR TESTING ADJUSTABLE HYDROSTATIC PUMPS Teodor-Costinel Popescu, Ioan Lepadatu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 146 - 152
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• NEW CONTRIBUTIONS TO THE STUDY OF DESTRUCTION BY CAVITATION OF TWO BIPHASIC (AUSTENITE + FERRITE) STAINLESS STEEL FOR THE MANUFACTURE OF BLADES AND ROTOR HYDRAULIC MACHINES Ilare BORDEAȘU, Constantin BORDEAȘU, Brandusa GHIBAN, Ain Dan JURCHELA, Octavian OANCĂ, Adrian KARABENCIOV – “POLITEHNICA” University of Timisoara, ROMANIA 153 - 159 • MAINTENANCE AND TESTING OF THE HYDRAULIC SERVOVALVES Radu Radoi, Ioan Balan, Iulian Dutu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 160 - 165
SECTION II: MOBILE HYDRAULICS AND TRIBOLOGY
• WHAT TO DO WITH A HYBRID DRIVE SYSTEM? Krzysztof Kedzia - Wroclaw University of Technology, POLAND 166 – 174 • TRIBOLOGICAL RESEARCHES REGARDING THE INCREASING OF PERFORMANCES OF THE FLUID POWER EQUIPMENTS Corneliu CRISTESCU, Petrin DRUMEA, Constantin Ranea - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA / “POLITEHNICA” University of Bucharest, ROMANIA 175 – 184 • HYDRAULICS FOR MOBILE VEHICLES. NEW DRIVE SCHEMES Mihail Petrache, Sava Anghel, Alina Popescu – LYRA PROD IMPEX Company / Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 185 – 190 • LIFTING PLATFORM WITH POTENTIAL ENERGY RECOVERY SYSTEM Catalin Dumitrescu, Corneliu Cristescu, Florin Georgescu, Liliana Dumitrescu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 191 - 194 • HYDRAULIC DRIVING SYSTEMS FOR MOBILE EQUIPMENTS DESTINED FOR ASPHALT POURING Victor Balasoiu, Mircea Popoviciu, Ilare Bordeasu - “POLITEHNICA” University of Timisoara, ROMANIA 195 – 202 • RESEARCH ON FRICTION LOSSES IN THE TENSIONING DEVICES UNDER LOAD Andrei Grama, Constantin Chirită, Mihai Afrăsinei, Vasile Damaschin – Technical University “Gheorghe Asachi” of Iasi, ROMANIA 203 – 209 • TRANSFER FUNCTION OF A PRESSURE TRANSDUCER WITH DRAWER I. Nicolae, M. Cotrumba - Ovidius University of Constanta, ROMANIA 210 – 214 • LIFTING EQUIPMENT WITH RECOVERY SYSTEM OF POTENTIAL ENERGY Stefan Alexandrescu, Corneliu Cristescu, Gheorghe Sovaiala, Alexandru Marinescu, Ioan Pavel - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 215 – 222 • NUMERICAL SIMULATIONS FOR A HYDRAULIC SYSTEM WITH SECONDARY CONTROL Vasile Huian, Doru Călărasu, Constantin Chirită, Mihai Afrăsinei - Technical University “Gheorghe Asachi” of Iasi, ROMANIA 223 – 228 • DIGITAL CONTROL MODULES FOR HYDRONIC EQUIPMENTS Iulian Dutu, Radoi Radu, Despina Duminica - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA / “POLITEHNICA” University of Bucharest, ROMANIA 229 – 234 • INCREASING THE ENERGETIC EFFICIENCY OF PET BUNDLING PRESS USING HIDROSTATIC ENERGY RECOVERING SYSTEMS Ionel Nita., Corneliu Cristescu, Alexandra Liana Visan, Alexandru Marinescu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 235 – 241 • HYBRID SYSTEM FOR ENERGY RECOVERY AT BREAKING Alexandru Vasile, Andrei Drumea, Cristina MARGHESCU, Paul SVASTA, Andreea BRODEALA - “POLITEHNICA” University of Bucharest, ROMANIA 242 – 247 • MOBILE SKID SIMULATOR FOR TRAINING OF CAR DRIVERS Radu Radoi, Ioan Balan, Marian Blejan - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 248 – 252 • THEORETICAL AND EXPERIMENTAL RESEARCH OF RECIPROCATING ROD SEALS Monica Crudu, Aurelian Fatu, Mohamed Hajjam, Corneliu Cristescu - University of Poitiers, FRANCE / Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 253 – 260
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• MODELING AND SIMULATION OF HYDRAULIC AND MECHANICAL SYSTEM OF COMPACT UTILITY LOADER Shinok Lee, Mingi Cho, Daeyoung Shin, Gangwon Lee - Institute of Industrial Technology, KOREA 261 – 269
SECTION III: HYDRAULICS SYSTEMS
• HYDRAULIC SCHEMES FOR IMPACT DEVICES. A CONTROL SYSTEM FOR IMPACT MECHANISMS USING A ROTATABLE DISTRIBUTION VALVE – PART1 Claudia Kozma, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 270 – 280 • HYDRAULIC SCHEMES FOR IMPACT DEVICES. A CONTROL SYSTEM FOR IMPACT MECHANISMS USING A ROTATABLE DISTRIBUTION VALVE – PART2 Claudia Kozma, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 281 – 284 • STRENGTHENING SURFACE LAYERS OF COMPONENTS Marian Kralik – University of Technology in Bratislava, SLOVAKIA 285 – 290 • CAMIRO LONG LIFE NEW HYDRAULIC EQUIPMENT TECHNOLOGY FOR DRILLING FLUIDS AND SALT WATER INJECTION PUMP Miron M. Procop, Oana-Miruna Procop, Rodica Procop - CAMIRO ENGINEERING Company Constanta, ROMANIA 291 – 294 • SOME ASPECTS OF THE DRIVE WITH THE MASSES UNBALANCED VIBRATING Stoica Dorel, Voicu Gheorghe, Carmen Rusanescu - “POLITEHNICA” University of Bucharest, ROMANIA 295 – 300 • CONSIDERATIONS ABOUT THE SELECTION OF THE HAMMER MILLS OF LOW CAPACITY Mihaela Duţu, Ladislau David, Ion Dinu, Carmen Rusănescu - “POLITEHNICA” University of Bucharest, ROMANIA 301 – 304 • A NEW SOLUTION FOR WATER JET CUTTING MACHINE TOOL Rareş Petruş, Cornel Ciupan, Emilia Ciupan - Technical University of Cluj-Napoca, ROMANIA 305 – 308 • RESEARCHES TO IMPROVE WORKING PROCESS OF ACTIVE WORKING PARTS, HYDRAULIC ACTUATED, FROM CONSTRUCTION OF THE EQUIPMENT "EXPLANT 500" Constantin Cota, Elena Nagy, Nicolae Cioica - National Institute of Research - Development for Machines and Installations Designed to Agriculture and Food Industry – Bucharest- ROMANIA 309 – 314 • THE CONTROL OF THE ABRASIVE WATER JET PROCESSING USING A NEURONAL NETWORK MODEL Emilia Ciupan, Cornel Ciupan, Rareş Petruş - Technical University of Cluj-Napoca, ROMANIA 315 – 319 • EXPERIMENTAL RESEARCH BY MEASURING THE PULLING FORCE OPERATING PRESSURE USING THE DATA ACQUISITION BOARD Constantin Chirită, Andrei Grama, Mihai Afrăsinei, Vasile Damaschin - Technical University “Gheorghe Asachi” of Iasi, ROMANIA 320 – 326 • RISK ASSESSING WITH FMEA ANALYSIS AND FUZZY LOGIC Despina Duminica, Mihai Avram, Iulian Dutu - “POLITEHNICA” University of Bucharest, ROMANIA / Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 327 – 334 • THE STUDY OF ELASTIC-PLASTIC PROPERTIES OF THE COMPOSITE PLATING MACROINDENTATION Vasile Javgureanu, Pavel Gordelenco - Technical University of Moldova - MOLDOVA 335 – 340 • PLOTTING THE CLARIFYING CURVES AND DETERMINATION OF THE SPECIFIC AMOUNT OF SETTLED MATERIAL DURING THE INITIAL PERIOD TO SEDIMENTATION IN STATIONARY COLUMN OF AQUEOUS SUSPENSIONS OF SOLIDS Viorel Safta, Mirel Dilea, Gabriel Constantin-“POLITEHNICA” University of Bucharest, ROMANIA 341 – 346 • THE MEASUREMENT WITH PNEUMATIC TRANSDUCERS OF THE CERAMIC PRODUCTS CONTRACTION AT DRYING Murad Erol, Haraga Georgeta, Dumitrescu Catalin, Liliana Dumitrescu - “POLITEHNICA” University of Bucharest, ROMANIA/ Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 347 – 351 12 ISSN 1454 – 8003 Proceedings of 2012 International Conference of Hydraulics and Pneumatics - HERVEX 7 - 9 November, Calimanesti-Caciulata, Romania
• DIRECT / INDIRECT ADAPTIVE ROBUST CONTROL FOR LINEAR HYDRAULIC ACTUATOR Daniel-Vasile Banyai, Ioan-Lucian Marcu, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 352 – 358 • THE CALORIC EFFECTS IN ONE SERIAL SONIC INSTALLATION BAL Carmen, BAL Nicolaie - Technical University of Cluj-Napoca, ROMANIA 359 – 363 • SOME ELASTOPLASTIC DEFORMATION AND FAILURE GALVANIC ELECTROLYTIC IRON COVER Vasile Javgureanu, Pavel Gordelenco - Technical University of Moldova - MOLDOVA 364 – 368 • DESIGN OF THE SYSTEM DRIVE TO THE PNEUMO-VEHICLE WITH PNEUMATIC LINEAR ENGINE IN 2 CYLINDERS Constantin Bungău, Tudor Mitran, Tiberiu Vesselenyi, Dan Crăciun- University of Oradea, ROMANIA 369 – 375
SECTION IV: ENVIRONMENT, ECOLOGY AND RENEWABLE ENERGY
• NOTES ON THE ENERGETIC TRANSFER IN HYDROSTATIC SYSTEMS Eugen Dobanda - “POLITEHNICA” University of Timisoara, ROMANIA 376 – 382 • EXPERIMENTAL RESEARCH TO VALIDATE SIMULATION MODEL OF HYDRAULIC MOTOR HYDRAULIC TRANSMISSION FOR LOW POWER WIND TURBINES Constantin Chirită, Mihai Afrăsinei, Vasile Damaschin, Andrei Grama - Technical University “Gheorghe Asachi” of Iasi, ROMANIA 383 – 391 • CERCETĂRI SI TEHNOLOGII PENTRU REDUCEREA CONSUMULUI DE CARBURANT AL AUTOVEHICULELOR DE TRANSPORT MARFĂ SI PERSOANE Zorin Bercea, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 392 – 402 • EXPERIMENTAL RESEARCH TO VALIDATE SIMULATION MODEL OF CONSTANT SPEED AT LOW POWER AXIS WIND TURBINE Mihai Afrăsinei, Constantin Chirită, Vasile Damaschin, Andrei Grama - Technical University “Gheorghe Asachi” of Iasi, ROMANIA 403 – 410 • STATE OF THE ART BIOMASS COMBINED HEAT AND POWER TECHNOLOGY Curac Ioan, Craciun Bogdan Ionut Creta Ioan - Technical University of Cluj-Napoca, ROMANIA 411 – 417 • FACTORI CARE INFLUENTEAZĂ SEMNIFICATIV CONSUMUL DE CARBURANTI ÎN TRANSPORTUL AUTO Zorin Bercea, Liviu Vaida - Technical University of Cluj-Napoca, ROMANIA 418 – 425 • INFLUENCE OF CRIMPING ANGLE ON HEAT TRANSFER FOR HEAT EXCHANGERS Oana Giurgiu, Dan Opruta, Angela Plesa - Technical University of Cluj-Napoca, ROMANIA 426 – 429 • SOLAR POWER INSTALLATION HOT WATER TO HOUSING FAMILY TYPE Carmen Rusanescu, Adriana Gruia, Mihaela Dutu, Stoica Dorel – “POLITEHNICA” University of Bucharest, ROMANIA 430 – 433 • STUDY ON THE WORKING PRINCIPLE OF A HYDRAULIC ENERGY DISSIPATION DEVICE Gavril Axinti, Florin Nedelcuţ, Fanel Şcheaua- “Dunarea de Jos” University from Galati, ROMANIA 434 – 439 • HEAT GENERATORS WITH TLUD GASIFIER FOR GENERATING ENERGY FROM BIOMASS WITH A NEGATIVE BALANCE OF CO2 Erol Murad, Florian Dragomir – “POLITEHNICA” University of Bucharest, ROMANIA 440 – 447 • PNEUMATIC MEASURING OF THE BIOMASS CONSUMPTION FOR TLUD GENERATOR Erol Murad, Georgeta Haraga, Cătălin Dumitrescu, Liliana Dumitrescu - “POLITEHNICA” University of Bucharest, ROMANIA / Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 448 – 453 • MONITORING OF ENVIRONMENTAL FACTORS AT VEGETABLE OILS PRODUCING UNITS Gabriela Simion, Alina Colan, Mihaela Dutu - “POLITEHNICA” University of Bucharest, ROMANIA 454 - 459
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• EXPERIMENTAL RESEARCH TO VALIDATE THE SIMULATION MODEL HYDRAULIC TRANSMISSION FOR WIND TURBINES SMALL ADAPTIVE PRESSURE CONTROL ON CALCULATION ERRORS Vasile Damaschin, Mihai Afrăsinei, Constantin Chirită, Andrei Grama - Technical University “Gheorghe Asachi” of Iasi, ROMANIA 460 – 468 • CONSIDERATIONS FOR OPTIMIZING THE CROPS IN AGRICULTURAL FARMS FROM THE MARKET ECONOMY IN ROMANIA Oana David, Ladislau David, Mihaela Duţu - “POLITEHNICA” University of Bucharest, ROMANIA 469 – 472 • BIODEGRADABLE OILS – METHODS FOR DETERMINING THE PERFORMANCES OF BIODEGRADABLE OILS Alina Popescu, Sava Anghel, Adrian Pantiru, Alexandru Marinescu, Mihail Petrache - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA / LYRA PROD IMPEX Company 473 – 477 • HYDRAULIC INSTALLATION WITH ENERGETIC AUTONOMY FOR LAKES AERATION Adrian Ciocanea, Sanda Budea - “POLITEHNICA” University of Bucharest, ROMANIA 478 – 484
SECTION V: EDUCATION AND TRAINING IN FLUID POWER
• EDUCATION & QUALIFICATIONS IN FLUID POWER John Savage – CETOP / National Fluid Power Centre, UNITED KINGDOM 485 – 506 • NEW SMC DIDACTIC EQUIPMENTS – SUPPORT FOR PERFORMANCE IN EDUCATION Valeriu Banu, Dragos Gheorghe – SMC ROMANIA 507 – 523 • NEW INSTRUMENT FOR LUBRICANTS BEHAVIOR EDUCATION AND TRAINING Alexandru Radulescu, Irina Radulescu - “POLITEHNICA” University of Bucharest, ROMANIA / Mechanical Engineering and Research Institute – ICTCM, ROMANIA 524 – 529 • RELATII PUBLICE SI COMUNICARE IN FOLOSUL ACTIVITATILOR DE CERCETARE-DEZVOLTARE-INOVARE Radu Jecu – Centre of Technological Information – CENTIREM, Bucharest, ROMANIA 530 – 532 • STOCK EXCHANGE OF NEW INVENTIONS Petrin Drumea, Niculae Ioniţă, Costinel Popescu, Catalin Dumitrescu - Hydraulics and Pneumatics Research Institute in Bucharest, ROMANIA 533 – 542 • EDUCATION IN DEVELOPMENT OF ELECTRONIC MODULES USING FREE AND OPEN SOURCE SOFTWARE TOOLS Andrei Drumea, Alexandru Vasile – „POLITEHNICA” University of Bucharest, ROMANIA 543 – 548 • ELEMENTS OF STRATEGY AND INNOVATION POLICIES IN THE FIELD OF FLUID POWER – INTRODUCTION Henryk Chrostowski, Zygmunt Popczyk – Wrocław University of Technology, POLAND 549 - 581
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Univ.-Prof. Dr.-Ing. Hubertus Murrenhoff Institutsdirektor / Executive Director Institut für fluidtechnische Antriebe und Steuerungen (IFAS) Institute for Fluid Power Drives and Controls (IFAS) - RWTH Aachen University E-mail: [email protected]
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55 ISSN 1454 – 8003 Proceedings of 2012 International Conference of Hydraulics and Pneumatics - HERVEX 7 - 9 November, Calimanesti-Caciulata, Romania
HYDRAULIC SWITCHING CONTROL – OBJECTIVES, CONCEPTS, CHALLENGES AND POTENTIAL APPLICATIONS
Rudolf SCHEIDL1, Helmut KOGLER1, Bernd WINKLER2 1 Johannes Kepler University Linz, [email protected]. 2 Linz Center of Mechatronics, [email protected]
Abstract: Hydraulic switching control operates via the switching of valves. Numerous principles exist, some of which are already routinely applied, some others have been studied, but many more are possible. A successful realization of many switching techniques requires fairly advanced hydraulic components, foremost fast switching valves, fast check valves and compact accumulators which can resist high load cycles, and a sound understanding of the relevant processes by advanced modelling, simulation, and experimental analysis. Switching control can bring the following advantages: lower costs, higher robustness, better standardization, easier control due to better repeatability and less hysteresis; better energetic efficiency by the application of energy saving converter principles; generation of very fast motion for relatively high loads. Some elementary switching principles and switching converter principles are described in this paper. The authors expect an early industrial application of novel switching techniques in heavy duty and in agricultural machines.
Keywords: Hydraulic switching control, switching converters, buck converter, electric hydraulic analogy.
1 Introduction
The idea to employ switching systems for realizing some sort of hydraulic transformers is an old idea as the hydraulic ram of Montgolfier from 1796 and Pollard’s work on pulsating hydraulic power transmission (1964) [1] show. The major motivation for the current attempts to realize hydraulic switching control is the success of switching control in modern electric drive technology.
Hydraulic switching control is a sub-domain of digital hydraulics, which is characterized by performing control only by the use of components with discrete states (see [2]). In hydraulic switching control these discrete state components are switching valves. Control input parameters are some timing characteristics of these valves which can be: the pulse-width of a pulse width modulated valve switching, the duration of individual pulses, switching frequencies, or the phase shifts of switching pulses of different valves, to mention just a few.
The basic motivations for switching control are: