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Hi everyone, I have some questions regarding violated and active responses. As attachment to this post there is a excerpt of f06 file of an optimization cycle. There are 4 DRESP2 Responses, all of them have an upper bound of 0.19. If you look to the top, you can read the following...

Hello everybody, I have some experience creating the FE models for the spot welds of steel structures like body-in-white (normally I use RBE3-CHEXA). Now, I am working for a new company where the body-in-white has some aluminium parts. Should it be expected a difference in the modelling of the...

Hello guys, generally in an optimization problem what would increase more the simulation time, increase the number of design variables (DESVAR) or increase the number of constraints (DCONSTR)? Looking forward your feedback. Thanks

Hello everyone, does anybody have experience using MAC? Could anyone explain me what is the importance of having the AUTOMAC coefficients for a given structure? I know that AUTOMAC can give the insight about how good is the node pair table used, but do you know any other aspect that is...

Hello, can anyone explain me how this script works? Tool in Matlab to extract the modal parameters from FRF data (Complex Mode Indicator Function - CMIF): http://www.mathworks.com/matlabcentral/fileexchange/9476-cmif-complex-mode-indicator-function/content/jzcmif.m

I have a small task to perform and the command “syms k m c” doesn’t work. If you have any idea why doesn’t work, please let me know.

Hi, I have some acceleration curves measured by a test-engineer (the data available consists into Magnitude and Phase). Currently, I would like to have a list of the normal modes (eigenfrequencies). So, the question is: how to extract the normal modes using FRF-experimental data? Since I have a...

Hello, I am new using ABAQUS, could anybody help me how to define a dynamical load using GUI or through editing a inp file? Thank you

Hello, I am doing some acoustic simulations using MSC Nastran and the perturbed models consist often into some modifications in the doors and body-in-white (mainly, meshing tasks). The cavity model remained untouched. So, as result of these modifications, the SET1 of elements for the command...

Hello everyone, I am trying to perform a simple frequency response analysis using ABAQUS - using a 2-DOF model Here is the NASTRAN inputdeck: ID FRF_TWO_DOF SOL 111 CEND TITLE = TWO-DOF SYSTEM SUBTITLE = MODAL FREQUENCY RESPONSE LABEL = NASTRAN EXAMPLE $ SPC = 996 METHOD = 10 DLOAD = 999...

Hello everyone, I am attempting to generate some FRF plots in Abaqus to be able to compare to experimental data taken with an impact-hammer/accelerometer (unv file). My questions are: 1 - Which step should I use? "Direct-solution steady-state dynamic analysis"? 2 - How should I define the...

Hello everyone, anyone knows if it is correct to include Solid elements in the Fluid-Structure interaction? I am doing some simulations using ACMODL card, and the SSET that I have in the baseline model has solid elements (CHEXA from the structure), and one-dimension elements (CBUSH, CROD, RBE2...

Hello everyone, For a given hinge model of a car door, somebody replaced a CBAR by a RBAR connection. The frequency response results in the door outer panel were considerably changed. The CBAR is referenced to an isotropic material with the properties of the Steel. Both approaches allow the...