3 Replies Latest reply on Jul 8, 2014 4:59 AM by Jared Conway

helical conical spring simulation, equilibrium not achieved

Feng-Yueh Chan Jul 4, 2014 4:37 AM

Hello everyone,

I'm trying to simulate a helical conical spring to acquire spring k-value.

Beside the spring itself, I modeled a circular disk on each side of the spring to support and to apply force.

I use large displacement and soft spring to solve it.

Everytime I execute, the dialogue pop out, tell me that equilibrium not achieved.

I checked previous post and checked my contact condition, can't figure out what's going on.

The spring itself will contact after force applying onto, so I set no penetration between sweep body; and both the disks on each side are set BONDED to the spring.

Is there anything I miss-operated or I forgot?

Please check the attachment and give me some advices.

C40-1010-001 ONzSpr_N2D4_Sim2.SLDPRT.zip 383.0 KB

Re: helical conical spring simulation, equilibrium not achieved

Jared Conway Jul 7, 2014 12:02 AM (in response to Feng-Yueh Chan)

it sounds like you're trying to do this with static analysis, you will likely have a lot of challenges and the best fit would be nonlinear. do you have access to simulation premium?

second, why are you using soft springs? do you know that this may affect your ability to get good results?

also consider in the "real world" what woudl happen if you put a spring between 2 plates. it would be kind of unstable right? in simulation, same thing. you'll need to find a better way to stabilize the simulation. my suggestion to start would be to FIX the bottom of the spring and apply a force to the top or a displacement to the top and compress it without contact to get started.
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- Re: helical conical spring simulation, equilibrium not achieved
  
  Feng-Yueh Chan Jul 7, 2014 5:16 AM (in response to Jared Conway)
  
  Thanks for your suggestion, I',m now trying non-linear without softspring. Also, remove both the plate and model the spring like the real one. But now it solves so slow, takes 40 min to get a result. I guess it's because the element number or degree of freedom.
  
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  - Re: helical conical spring simulation, equilibrium not achieved
    
    Jared Conway Jul 8, 2014 4:59 AM (in response to Feng-Yueh Chan)
    
    And because you're using nonlinear.
    
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