TY - CHAP AU - Németh, Huba AU - Kristóf, Gergely AU - Szente, Viktor AU - Palkovics, László ED - Lajos, Tamás ED - Vad, János TI - Advanced CFD simulation of a compressed air injection module T2 - Proceedings of Conference on Modelling Fluid Flow (CMFF’06) PB - Budapest University of Technology and Economics, Department of Fluid Mechanics CY - Budapest SN - 9630603829 PY - 2006 SP - 388 EP - 395 PG - 8 UR - https://m2.mtmt.hu/api/publication/2610445 ID - 2610445 AB - Turbocharged engines exhibit the so called turbo lag phenomenon causing a disadvantageous response comparing to atmospheric or mechanically supercharged engines. There are many solutions developed to reduce the lag effect although each of them has some disadvantages. This paper investigates a booster module that injects compressed air to increase the response of turbocharged compression ignition engines of commercial vehicles. The investigations applied 3D computational fluid dynamic (CFD) simulations in stationary and transient manner as well. The transient simulations were applied as standalone and coupled calculations to a 1D engine simulation code to capture more accurate boundary conditions (BC). The drawbacks and problems of this new and advanced approach are emphasized in the paper. Due to the deformation of the flow field boundary surface during the dynamic process a deforming mesh method has been applied here. Instant shape of flow field boundary has been obtained by solving the equation of motion of the actuator rotor. By applying the above methods it was possible to validate the booster module design variants and to identify the main characteristics of the complete system including the engine. LA - English DB - MTMT ER - TY - CONF AU - Szente, Viktor AU - Vad, János ED - Voith, András ED - Szatmári, Éva TI - Noise and vibration studies on pneumatic circuit protection valves T2 - Összevont Gépjármű Konferencia: XXXVI. Autóbusz Szakértői Tanácskozás és Haszongépjármű Konferencia PB - Gépipari Tudományos Egyesület (GTE) C1 - Budapest PY - 2005 PG - 6 UR - https://m2.mtmt.hu/api/publication/2610439 ID - 2610439 AB - Pneumatic circuit protection valves are frequently used in the air supply systems of commercial vehicles. This paper presents a flexible computational simulation tool being applied in industrial research and development related to complex mechanical and fluid dynamical aspects in such devices. The numerical model has been created with AMESim, a commercial simulation environment, and then validated by simplified experiments. The comparative numerical and experimental study confirmed that the validated numerical model is able to predict the oscillatory behavior appearing in certain setups, and the system parameter alterations suggested by the simulation successfully eliminated the harmful vibration in the experimental setups as well. LA - English DB - MTMT ER - TY - JOUR AU - Szente, Viktor AU - Vad, János TI - Félempirikus modell kisméretű pneumatikus mágnesszelepekre JF - GÉP J2 - GÉP VL - 55 PY - 2004 IS - 2 SP - 22 EP - 27 PG - 6 SN - 0016-8572 UR - https://m2.mtmt.hu/api/publication/1632968 ID - 1632968 AB - Elkészítettünk egy félempirikus modellt, amely képes kisméretű elektropneumatikus (EP) szelepek átömlési karakterisztikájának visszaadására igen széles nyomásviszony-tartományban. Az átömlési karakterisztika alapjául egy egyszerűsített geometriára megalkotott analitikus modell szolgált. A valóságos geometria összetettebb voltából adódó korrekciókat a FLUENT CFD program segítségével készült kvázi-3D modellszámítások alapján végeztük el. Különféle geometriák vizsgálata alapján meghatározhatóvá vált az átfolyási szám és a geometria közti korreláció. LA - Hungarian DB - MTMT ER - TY - CHAP AU - Szente, Viktor AU - Vad, János ED - Meyer, J P TI - Computational and experimental investigation on the flow characteristics of small-scale pneumatic solenoid valves T2 - 2nd International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics (HEFAT 2003) PB - s.n. CY - Centurion SN - 9780620305037 PY - 2003 PG - 5 UR - https://m2.mtmt.hu/api/publication/2608669 ID - 2608669 AB - A simplified one-dimensional (1D) simulation model has been elaborated in AMESim environment, which is capable of analyzing and predicting the flow characteristics of small electropneumatic (EP) valves within a wide range of pressure ratios. The flow coefficient in the model has been identified on the basis of experiments and was compared with the Perry model. The flow coefficient values have been successfully reproduced by axisymmetric quasi-3D (Q3D) computations using the FLUENT code. A number of different geometries were analyzed to determine the correlation between the geometry and the flow coefficient. LA - English DB - MTMT ER - TY - JOUR AU - Szente, Viktor AU - Vad, János TI - A semi-empirical model for characterisation of flow coefficient for pneumatic solenoid valves JF - PERIODICA POLYTECHNICA-MECHANICAL ENGINEERING J2 - PERIOD POLYTECH MECH ENG VL - 47 PY - 2003 IS - 2 SP - 131 EP - 142 PG - 12 SN - 0324-6051 UR - https://m2.mtmt.hu/api/publication/1632967 ID - 1632967 AB - A semi-empirical model has been elaborated for analyzing and predicting the flow characteristics of small electro-pneumatic (EP) valves within a wide range of pressure ratio. As a basis for characterization of flow coefficient, an analytical model has been established for a simplified geometry. This model has been corrected corresponding to more complex valve geometries, utilizing the results of axisymmetric quasi-3D (Q3D) computations using the Computational Fluid Dynamics (CFD) code FLUENT. By this means, a semi-empirical modelling methodology has been elaborated for characterization of through-flow behavior of pneumatic valves of various geometries. LA - English DB - MTMT ER - TY - JOUR AU - Németh, Huba AU - Ailer, Piroska Gyöngyi AU - Hangos, Katalin TI - Nonlinear modelling and model verification of a single protection valve JF - PERIODICA POLYTECHNICA TRANSPORTATION ENGINEERING J2 - PERIOD POLYTECH TRANSP ENG VL - 30 PY - 2002 IS - 1-2 SP - 69 EP - 92 PG - 24 SN - 0303-7800 UR - https://m2.mtmt.hu/api/publication/1020775 ID - 1020775 LA - English DB - MTMT ER - TY - CHAP AU - Szente, Viktor AU - Vad, János ED - Penninger, Antal ED - Ziaja, György ED - Vörös, Gábor TI - Computational and experimental investigation on the flow characteristics of electropneumatic valves T2 - Gépészet 2002 PB - Budapest University of Technology and Economics Faculty of Mechanical Engineering CY - Budapest SN - 9636991650 PY - 2002 SP - 431 EP - 435 PG - 5 UR - https://m2.mtmt.hu/api/publication/1632964 ID - 1632964 AB - A simplified one-dimensional (1D) simulation model has been elaborated in AMESim environment, which is capable for analyzing and predicting the flow characteristics of small electropneumatic (EP) valves within a wide range of pressure ratios in the sonic range. The flow coefficient in the model has been identified on the basis of experiments and was compared with the Perry model. The flow coefficient values have been successfully reproduced by axisymmetric quasi-3D (Q3D) computations using the FLUENT code. LA - English DB - MTMT ER - TY - CHAP AU - Szente, Viktor AU - Vad, János TI - Computational and experimental investigation on solenoid valve dynamics T2 - 2001 IEEE/ASME International Conference on Advanced Intelligent Mechatronics Proceedings PB - IEEE Press CY - New York, New York CY - Piscataway (NJ) SN - 0780367367 PY - 2001 SP - 618 EP - 623 PG - 6 DO - 10.1109/aim.2001.936537 UR - https://m2.mtmt.hu/api/publication/1633008 ID - 1633008 LA - English DB - MTMT ER - TY - CHAP AU - Szente, Viktor AU - Vad, János AU - Lóránt, Gábor AU - Fries, Ansgar ED - Palmberg, J O TI - Computational and Experimental Investigation on Dynamics of Electric Braking Systems T2 - 7th Scandinavian International Conference on Fluid Power (SICFP'01) PB - Linköping Institute of Technology CY - Linköping SN - 9173730564 PY - 2001 SP - 263 EP - 276 PG - 14 UR - https://m2.mtmt.hu/api/publication/1632961 ID - 1632961 AB - Electro-pneumatic (EP) components are frequently used in brake systems of commercial vehicles. The simulation of EP brake systems is of great importance in order to understand their dynamics for developing a control logic being robust but fulfilling the modern functional demands. On the other hand, the simulation aids the design of EP components being able to execute the commands of a precision control. The paper presents a flexible computational simulation tool being applied in industrial research and development related to complex mechatronics in brake systems for commercial vehicles. The Electric Braking System (EBS) case study presented herein comprises an air supply unit, an EBS modulator, piping, a diaphragm brake chamber, and the connected brake mechanism. The simulation environment is AMESim® 3.0. Considering the complexity of the EP components and the related phenomena, special models have been elaborated for the solenoid valves, piping, and the diaphragm brake chamber. The simulation results show good agreement with measurement data. The comparative numerical and experimental study confirmed that the simulation tool can be effectively used in design, research and development of EP brake systems. LA - English DB - MTMT ER -