Infoplaner 1-2007 - Cadfem

CADFEM INFOPLANER 1/2007CADFEM CAE ConsultingDo you generally outsource analysis and simulationtasks? Or do you have to fill a temporary shortage inprofessional skills? Do you have to solve a very specificanalysis problem? Are you new to FEM (Finite ElementMethod) or CFD (Computational Fluid Mechanics) andwish to work on a problem in collaboration with ourexpert staff?CADFEM is the answer! The company’s engineers havein-depth experience in the most diverse analysis disciplinesand can thus provide you with reliable, qualified,confidential implementation of your chosen analysis service.Fig 3: SRSS displacement forhorizontal earthquake excitationdefined e.g. by governmentauthorities (Fig. 2). Now,the analyst’s task is to do amodal analysis first to get theeigenfrequencies and modeshapes of the structure. Afterthat the mode shapes arescaled according to the givenresponse spectrum. A modecombination method likeSRSS or CQC is applied to getthe final result, for instancein terms of maximum displacement(Fig. 3). This waya response spectrum analysisdoes not compute thewhole transient time historyof the earthquake excitation.Rather it is a simplifiedmethod to get the maximumresponse. Large models withmore some million degrees offreedom can be analyzed thisway. A special filtering techniquemay be used in orderto suppress negligible modes.Usually a certain percentageof the overall structural massis required to participate inoscillation. For that purposemodal participation factorsand modal effective massoutput from ANSYS may beused.Simulation Expertise• Statics/Dynamics• Fatigue• Crash• Passenger & Pedestrian Safety• Metalforming• Heat Transfer• Computational Fluid Dynamics• Fluid-Structure-Interaction• Acoustics• Electromagnetics/Electrostatics/HF• Multiphysics• MEMS• Mechatronics• Bonding• Material/Composites• Optimization• Processes (Welding, Casting, Coating, Molding)ContactDr.-Ing. Marold MoosrainerPhone +49 (0)8092-7005-45E-Mail mmoosrainer@cadfem.de15Figures by courtesy ofVERTEX Antennentechnik GmbH.Fig. 2: Specified response spectrum specified in a log-log scale. This isthe input for an earthquake analysis.Applications and Technology