22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 PDF
Preview 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014
22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Proceedings of 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 25th – 27th of June 2014, Jasná, Slovak Republic Sponsors: http://aum.svsfem.cz 1 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. © SVS FEM s.r.o. ISBN: 978-80-905525-1-7 http://aum.svsfem.cz 2 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Content ANALYSIS OF TOLERANCE FIELD IMPACT ON CRADLE BEARING OF SWASH PLATE DESIGN AXIAL PISTON PUMP. ......................................................................................................................................... 5 Pavol Balco, Michal Masny APPLICATION OF THE DIFFERENT COMPUTATIONAL MATERIAL MODELS OF POLYMER MATERIAL FOR EXPLICIT SOLUTION OF FEM IN LS-DYNA .............................................................................................. 10 Martin Dobeš, Jiří Navrátil COMPARISON OF CALCULATION OF PARAMETERS IN FRACTURE MECHANICS ................................... 20 Dušan Drobný, Oľga Ivánková MODELING OF A CAPACITIVE MICRO ACCELEROMETER WITH FE METHOD ........................................ 28 Gabriel Gálik, Vladimír Kutíš STRUCTURAL MULTIBODY DYNAMICS USING ANSYS – ADAMS INTERFACE ......................................... 40 V GOGA LOAD-BEARING CAPACITY OF FRICTIONAL JOINTS IN STEEL ARCH YIELDING SUPPORTS ..................... 49 Petr Horyl, Pavel Maršálek MATERIAL PARAMETERS ESTIMATION OF SMALL PUNCH TEST BY TWO VARIANTS OF GENETIC ALGORITHMS ......................................................................................................................................... 57 Jozef Hrabovský1, Petr Lošák2, Jaroslav Horský1 STUDIE VLIVU MÍRY ROZTRŽENÍ TĚSNÍCÍHO SVARU LAMELOVÉ PÁSNICE NA VELIKOST FAKTORU INTENZITY NAPĚTÍ ................................................................................................................................. 66 Pavel Hrubý, Ondřej Krňávek, Aleš Nevařil, Lucie Totková CFD ANALYSIS OF FUEL ASSEMBLY USING ANSYS CFX CODE ................................................................ 75 Jakub Jakubec, Vladimír Kutiš, Juraj Paulech DYNAMICKÁ ANALÝZA ŽELEZOBETÓNOVEJ VALCOVEJ NÁDRŽE ........................................................... 87 Norbert Jendželovský, Ĺubomír Baláž DETERMINISTIC AND PROBABILISTIC ANALYSIS OF STEEL HALL COLLAPSE LOADED UNDER EXTREME WIND LOADS ......................................................................................................................................... 96 J. Králik NONLINEAR PROBABILISTIC ANALYSIS OF THE REINFORCED CONCRETE STRUCTURES USING ANSYS- CRACK SOFTWARE ............................................................................................................................... 102 Juraj Králik REMOVING HEAT FROM THERMAL SOURCE TO HEAT SINK THROUGH PRINTED CIRCUIT BOARD .... 114 Zbynek Makki, Marcel Janda PILOTOVÉ ZÁKLADY A VRSTEVNATÉ PODLOŽIE ................................................................................... 119 Ľubomír Prekop PROPOJENÍ SYSTÉMU STRENGTH SE SYSTÉMEM ANSYS ..................................................................... 125 http://aum.svsfem.cz 3 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Zdeněk Ramík, Stanislav Vejvoda DESIGN OPTIMIZATION OF FOUNDATION SLAB IN INTERACTION WITH SUBSOIL ............................. 134 Martin Štiglic OPTIMALIZÁCIA DOSKY NA PRUŽNOM PODLOŹÍ ................................................................................ 139 Katarína Tvrdá EXPERIMENTS WITH the influence of a Magnetic Field on the Speed of Temperature Change ........ 149 Eliška Vlachová-Hutová, Karel Bartušek, Pavel Fiala MODELOVANIE VYĽAHČENÝCH DOSIEK V PROGRAME ANSYS ............................................................ 158 Norbert Jendželovský, Kristína Vráblová AXIAL DIFFUSER DEVELOPMENT USING ANSYS SOFTWARE TOOLS .................................................... 165 Lukáš Zavadil1, Tomáš Krátký1, Vít Doubrava2 http://aum.svsfem.cz 4 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. ANALYSIS OF TOLERANCE FIELD IMPACT ON CRADLE BEARING OF SWASH PLATE DESIGN AXIAL PISTON PUMP. PAVOL BALCO, MICHAL MASNY Engineering CAE, High Power Closed Circuit, Hydrostatic Division, Danfoss Power Solutions a. s., Považská Bystrica Abstract: Swash plate design is the common used in axial piston pumps. One of the solutions for supporting of Swash-plate is Unitized Cradle bearing. This type of bearings is loaded mainly static. Tolerances of Inner and Outer race are closely associated with distribution of contact pressure and corresponding bearing life. In this paper there is shown how FEA approach could be used to analyze the issue of tolerance impact into the contact pressures, from pre-processing to post-processing. Keywords: FEA, axial piston machine, bearing, cradle bearing, roller, swash-plate, contact pressure, tolerance field, clearance. 1 Introduction Hydrostatic machines are commonly used in wide range of applications in mobile industry. Advantages of hydrostatic machines are impressive in many cases, but demands of the market and requests of the customers drive the manufacturers to provide better products, offering higher performance, working at higher pressures. Hydrostatic machine contains a lot of rotating parts and all this parts are supported by bearings. It means that choice of bearings is very important task. Axial piston pumps (Image 1) are the most commonly used pumps when variable displacement is required for a machine. They possess many advantages especially in region of higher operating pressure. A demerit of piston pumps is relatively high number of moving parts. Image 1- Axial piston machine of Swash Plate design [1] Bearings are currently used in numerous applications important in everyday life. Main goal of bearing is to reduce friction between moving parts or to support moving loads. It is known two basic types of mechanical bearings used in machinery: Sleeve bearings and Rolling bearings. Cylindrical roller bearings are the best solution for exceptionally heavier- duty applications. Variable displacement pump require an adjustable Swash-plate. A frequently used design for support of Swash-plate in radial roller bearing is depicted in the Image 2, known as “Cradle bearing”. http://aum.svsfem.cz 5 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Image 1 - Partial exploded model of the Hydrostatic units Swash Plate design 2 Motivation and scope of the paper Clearance between Housing and Swash plate has influence on the contact pressure and reaction forces distribution within the bearing – in each roller interaction. This contribution is focused on the CAE approach how this similar issue can be analyzed from FEA point of view. 3 Numerical FE simulations of bearing in an axial piston pumps 3.1 FE model The analysis contained three modifications which reflect three positions in the tolerance field from tolerance stack up analysis point of view. Cumulative effect form the stack up analysis shows two worst cases – minimum and maximum clearances. Additionally, assembly with nominal dimensions has been also used for the FEA (Image 3). Image 3 - All three modifications from tolerance field. http://aum.svsfem.cz 6 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Simplified geometry prepared for calculation is shown on the Image 4. Angle of the Swash plate has been tilted at maximum displacement together with Cradle bearing. Image 4 – Simplified CAD and FE model Bearing cage of Cradle bearing is substituted by spring elements COMBIN14. Two types of spring’s elements with different stiffness has been used: 1) first type of spring elements have fixed the rollers on right position – substitution of bearing cage; 2) second type of spring elements reduced rigid body motion of the rollers and others parts. The stiffness of spring’s elements is different to the previous one. The first type had 20 times higher stiffness than second one - springs has been used for stabilization of the calculation. Image 5 – Cross-sectional view on the FE model Sectional view of corresponding FE model is presented on the Image 5. In the model there is used combination of linear/quadratic solid hexagonal and tetrahedral elements. The Inner and Outer bearing ring have been meshed by high order solid element SOLID186 to obtain hexagonal mesh. Next volumes, Housing and Swash-plate have been meshed by low order element SOLID185. Linear solid hexagonal mesh has been crated for the volumes of Swash plate under the contact region. Tetrahedral elements have been used for the rest volumes of the FE model. http://aum.svsfem.cz 7 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. The volumes of Rollers have been split due to creating quadratic solid hexagonal mesh in contact area using the element type SOLID186. The inner volumes have been removed from the rollers and this volume was replaced by “Multi-point constrains equation” with “pilot” point in the center of roller (Image 6). Behavior of surface connected with pilot point was adjusted as “Rigid”. Diameter of removed volume is calculated from Hertz’s elastic theory of contact. This practice saves a lot of number of degrees of freedom. This approach is suitable for relative comparison of contact pressures and reaction forces distribution for all three variants of the tolerance field. Image 6 – Simplification of rollers with rigid inner surface + pilot point The FE model contains linear and quadratic shape function elements, therefore bonded contacts between the parts of various shape function meshes has been used. All parts which interacts each other have been defined as frictional contact. All three clearances from the tolerance zone mentioned above have been represented by “Contact offset settings” of contact between Rollers and Inner race. The contact offset corresponds with the values from tolerance field. It means that the maximum clearance has been represented by the positive value of contact offset and vice-versa, for minimum clearance, the contact offset has been represented by the negative value. 3.2 FEM results of contact analysis One of the major results from this analysis is outcomes related with the contact results, especially contact pressures and contact forces distribution. Results presented on the underlying elements of each roller are contact pressure and contact force distribution on the Inner bearing race. Results are presented on the picture Image 7. The results show the most loaded roller and its contact pressure. This information are very important for estimation of load bearing capability and fatigue life with respect of whole range of tolerance field. 4 Conclusion Clearance between Housing and Swash plate has influence on the contact pressure and reaction forces distribution within the Cradle bearing. It can lead to one of the major impacts to the endurance and also on noise and vibration of whole unit. This contribution is very briefly focused on the CAE approach and method how to do the FEA on this similar issue. Valuable outcomes from this analysis can lead the design engineers to making an decisions about tolerances of Swash-plate and Housing and also to reducing final costs and increasing endurance of the Cradle bearing and also the hydrostatic unit. http://aum.svsfem.cz 8 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. Minimum clearance Nominal dimensions Maximum clearance Minimum clearance Nominal dimensions Maximum clearance Image 7 – Contact force and Contact pressures distribution on inner race of each roller interaction References IVANTYSYN J., IVANTYSYNOVA M., 2001. Hydrostatic pumps and motors: principles design, performance, modeling, analysis, control and testing. New Delhi, India: ABI Overseas Limited. 512 s. ISBN 81 855 221 62 BATHE K. J., 1995. Finite Element Procedures. New Jersey: Prentice Hall, Englewood Cliffs ANSYS Release 15, Documentation. Contact address: Ing. Pavol Balco Danfoss Power Solutions a. s., Kukučínova 2148-84, Považská Bystrica, Slovakia. http://aum.svsfem.cz 9 22nd SVSFEM ANSYS Users' Group Meeting and Conference 2014 SVSFEM s.r.o. APPLICATION OF THE DIFFERENT COMPUTATIONAL MATERIAL MODELS OF POLYMER MATERIAL FOR EXPLICIT SOLUTION OF FEM IN LS-DYNA MARTIN DOBEŠ, JIŘÍ NAVRÁTIL Development of fuel delivery modules – CAE simulations, Robert Bosch spol. s.r.o. Abstract: This article deals with the experimental measuring of material data used for computational FEM analyses. Obtained material computational models are used in common engineering work. The focus is on the strain rate dependence of the tensile behavior of the Polymer materials. Acquired results are demonstrated on the problem of crash test of the fuel tank with fuel supply module. The applied loading is from real crash tests. Keywords: finite element method, LS-DYNA, polymer, strain rate dependence, fuel supply module 1 Introduction Fuel supply module, which consists of fuel pump, filter system, rail of the fuel, regulation system and flange belongs between main components of the fuel system of the car. The majority of all parts is made from Polymer materials. The materials based on TSCP (typical semi-crystal polymer) are the most common ones in this automotive branch. The development approach based on FEM calculations is commonly used in present time. This approach offers financial and time saving during development process; the number of tests can be reduced, due to virtual testing based on simulations. Image 2 – Position of the fuel supply module in the car The basic precondition for correct FEM analyses are correct input material data. This paper deals with obtaining suitable material data with strain rate dependency and their using in different cracking models in software LS-DYNA. These data are later used in simulations of parts from polymer materials (TSCP) loaded by impact signal. It is demonstrated in chapter 5 where the response of the fuel supply module in the fuel tank from crash car loading is shown. 2 Experimental measurements – model of material *MAT_24 http://aum.svsfem.cz 10
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