Automotive Amplitude based frequency response simulation in Abaqus

AI Thread Summary
The discussion centers on setting up an amplitude-based frequency response simulation in Abaqus, specifically applying a displacement of 0.2 mm at a concerned frequency of 100 Hz. It is noted that Abaqus does not allow nonzero displacements as boundary conditions in mode-based dynamic response procedures, meaning users must use base motion or apply a force instead. The original poster seeks guidance on how to configure the analysis and whether amplitude can be applied in steps over a frequency range of 0-200 Hz. A suggestion to search for existing resources on Abaqus frequency analysis is provided. Ultimately, the user decides to proceed with applying a force for the simulation.
Sam George
Messages
2
Reaction score
0
TL;DR Summary
Enforce displacement in Frequency Response Simulation
Hi,

I have inputs like displacement of a driving mechanism and then the frequency of concern .

Displacement: 0.2 mm
Concerned Frequency: 100 Hz


I would like to evaluate a part with the input displacement applied to a node and not as base excitation.
It can be sweep over the frequency range 0-200Hz

How do we set it up in Abaqus, can we give amplitude in steps over the frequency range?

Please guide me with a link or syntax on how to proceed with the analysis setup.

Regards,
Sam George
 
Engineering news on Phys.org
Here’s a quote from Abaqus documentation (chapter about SSD analyses):

It is not possible to prescribe nonzero displacements and rotations directly as boundary conditions in mode-based dynamic response procedures. Therefore, in a mode-based steady-state dynamic analysis, the motion of nodes can be specified only as base motion; nonzero displacement or acceleration history definitions given as boundary conditions are ignored, and any changes in the support conditions from the eigenfrequency extraction step are flagged as errors.

So you have to either use a base motion BC or apply a force instead.
 
  • Informative
  • Like
Likes Sam George and berkeman
FEAnalyst said:
Here’s a quote from Abaqus documentation (chapter about SSD analyses):

It is not possible to prescribe nonzero displacements and rotations directly as boundary conditions in mode-based dynamic response procedures. Therefore, in a mode-based steady-state dynamic analysis, the motion of nodes can be specified only as base motion; nonzero displacement or acceleration history definitions given as boundary conditions are ignored, and any changes in the support conditions from the eigenfrequency extraction step are flagged as errors.

So you have to either use a base motion BC or apply a force instead.
Thanks for the reply, I think I will have go with using Force.
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Thread 'What's the most likely cause for this carbon seal crack?'
We have a molded carbon graphite seal that is used in an inline axial piston, variable displacement hydraulic pump. One of our customers reported that, when using the “A” parts in the past, they only needed to replace them due to normal wear. However, after switching to our parts, the replacement cycle seems to be much shorter due to “broken” or “cracked” failures. This issue was identified after hydraulic fluid leakage was observed. According to their records, the same problem has occurred...
Back
Top