Can anyone help with a Sine-on-Random Vibration Simulation?

I want to make a simulation for 400 time steps, how can I give in Ansys Workbench?

Hello everyone,

I'm modeling on ansys apdl.

I would connect two different elements: beam 188 and shell 181 with cerig command.

I tried to apply cerig command with this code:

"

allsel,all,all

!Cerig beam e shell

csys,12 !12 is the local system for the beam

! MASTER node

NodoMaster=node(0,0,0)

! slaves

csys,global !shell is defined in the global system

alls

nsel,s,loc,y,1740,1750

cerig,NodoMaster,all,all

allsel,all,all "

Sadly it does not work, error message is "the independent node (node number) is undefined or unselected. The cerig command is ignored"

Has someone idea about any solution for this problem?

Hope you can help me, thank you very much

I want to perform time history analysis on an RCC frame structure for earthquake loading in the transient module of ANSYS mechanical. From the input table of applied acceleration, when I turn on the base excitation option, I can not select the boundary conditions and the direction of applied acceleration; while I turn off the base excitation option, the software selects all bodies, but I am also not able to select any direction. Can anyone explain how to figure this out?

Please have a look at the snapshots of both cases.

Hi

I have a simulation where an impactor with initial velocity strikes another part. I want to observe the oscillation of the part that has been struck, however the impactor gets in the way and strikes the part again.

Is there a way I can set a time limit for how long the impactor is active? So that it is deleted, avoiding a secondary impact?

Hi,

I'm traying to perform a successive modal analysis using APDL, at the end of every analysis i need to save modal frequencies in a table by APDL commands. Please, is there anyone who can help?

kind regards

Does LS DYNA have a function similar to ABAQUS's periodic media analysis?

I try to find a method to replace dynamic loading with equivalent static loading. As you know designing a structure with static loading is more easier than dynamic loading, especially when design is based on topology optimization process. Therefore, for dynamic events (for example impact loading), the problem must be replaced with equivalent static one. Complicated theoretical method can not be useful for industrial application. I need a simple method to be used for FEM analysis.

Hello,

A structure is tested for a Random Vibration (say Z axis, 0.1PSD, 20-3000Hz), where I obtained response acceleration from measurement system. Now I wanted to obtain same output(amplitude of modes) by giving Harmonic(sine) sweep as input(in Frequency domain) to Shaker machine. I read some on-line papers explaining conversion/equivalence from PSD to harmonic but none of them are actually working. Can someone please refer some good source?

Thank you,

Currently I am doing a CAE simulation using transient dynamic method. In that I am having time domain data and I need to convert it into frequency domain data.

I tried to conversion using Various software like Hyperview , metapost . But I didn't get the exact output what it is mentioned in the attachment. I tried in MATLAB also using FFT & PWELCH function. But I am not getting exact output what it is there in the attachment. What I need to do the in the MATLAB to get the proper results

Could anyone help me out in this