Oscillation in Abaqus

[dunst89]

Hello,
I am currently researching shaken baby syndrome at Cardiff University, I have a current model of a neck structure made of aluminium and rubber disks. I was wondering if there is a boundary or initial condition where I can simulate an oscillating base in order to view the range of motion of my neck?
Thanks,
Ben

 

[rstupplebeen]

Apply a boundary condition and create an amplitude. You probably want to run an explicit analysis to include inertial affects. Sounds like a cool and valuable simulation good luck.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[dunst89]

Hi, thanks for the help!

I have tried this before with no luck, as I get confused with what step i need and which type of amplitude to apply.

If I wished to oscillate the base back and forth through 750mm at varying speeds could you be more specific as to how I achieve this?

Cheers,
Ben

 

[rstupplebeen]

In Abaqus/CAE User's Manual check out section 55. "The Amplitude toolset" I hope this helps.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[dunst89]

Hi, haven't had much luck with that simulation, another valuable simulation would be applying an impact load, any suggestions as to how I do this? It seems like quite a simple simulation but I am new to ABAQUS! Cheers

 

[rstupplebeen]

I suggest starting with a very simplified model of something like a vertical rod and try to apply boundary conditions until you get your desired input. Most likely you need to model in explicit for your desired effects. Once you simplify your model post it here and we can probably help more.

Rob Stupplebeen

https://sites.google.com/site/robertkstupplebeen/

 

[dunst89]

Hi, I have had no joy with the manuals unfortunately, there is an extremely simplified model of the neck attatched. I wish either to apply an impact force of 10N to one of the sides of the Aluminium plate (with the base fixed), or to view how the neck moves when the base is oscillated at a low frequency (No steps or loads/pressures have been added to the simple model yet). It will be much appreciated if anyone can help! Cheers, Ben

 

[dunst89]

Hello, i was wondering if anyone had any updates for me, i am getting quite desperate now as my dissertation is due in a month!! thanks

 

[corus]

Create a step, say explicit dynamic, and apply a fixed displacement to the base. In the window that appears there is an option to create an amplitude for that displacement.

Tara

 

[dunst89]

This is where I dont really know what i am doing.. the create amplitude box displays lots of options (Tabular, Equally Spaced, Periodic, Modulated, Decay, Solution Dependent, Smooth Step, Actuator, User) and I dont know which one will best suit my problem, can you offer any more help?
Thanks

 

[corus]

You refer to oscillations at a low frequency. That suggests a periodic amplitude. Other than that I suggest you read the book yourself as students shouldn't be posting here.

Tara