Hello everyone,

 

I'm modelling a 4 bar linkage and am trying to optimize the design based on the angular displacement of the red link.  This optimization is being done through the use of a design study, which uses motion analysis sensors as goals.

 

4bar.gif

 

When looking at the results from the motion study, sensible values for the link angular displacement are obtained.  However, when these results are integrated into the design study as goals, values in the 1000's are typically obtained, which do not allow the design study to properly optimize. 

im2.PNG

im3.PNG

Any insight into this would be greatly appreciated.  I've attached my solid model as well.  I am using SOLIDWORKS Education 2017.

 

Thank you,

Alex


Categories: Simulation

Comments
Last comment By: Rasmus Høtoft Sørensen   Thu, 19 Apr 2018 14:05:20 GMT
Re: Motion analysis sensors in design study - angular displacement

Hello Alexander,

 

I have downloaded and run your case with the Design Study tool and I have encountered the exact same problem. I simply couldn't solve it using the Design Study, so instead, I run it through our own Solidworks Add-in, CORTIME.

 

If I understand correctly your problem (feel free to correct me if I don't) you want to minimize the angular displacement of the red bar while fulfilling Grashof's condition. For that to happen, I changed two things from your original set up:

 

First, I changed the ranges you were working with. I run the design through our Built checker, and it had problems rebuilding at some of the points.

 

With the new ranges, as you can see by the green light, the model rebuilds at any point.

 

The second change was done to the goals, since I assumed your goal was to make the angular displacement smaller I tried to minimize the Maximum value of the ang. displacement and maximize the Minimum value.

 

graph.PNG

 

This is the resultant graph obtained. The angular displacement went down to a total of 16 degrees.

 

Variables_objectives.PNG

 

 

 

As you can see in the last attached picture, I used the same constraints as you did in order to fulfill all the Grashof requirements.

 

Let me know if this was what you were looking for.

 

/Omar

By: Omar López  Mon, 05 Mar 2018 16:14:45 GMT
Re: Motion analysis sensors in design study - angular displacement

Alexander, this problem is known and has been reported as SPR 614207.

To request a fix and be notified of the evolution of the status of this SPR, please search for SPR 614207 in the SOLIDWORKS Knowledge Base (KB) and select 'notify me'.

At the current time, you can multiply the values you see in the table of results by PI/180 to get the correct value in degrees.

By: Julien Boissat  Thu, 08 Mar 2018 17:23:12 GMT
Re: Motion analysis sensors in design study - angular displacement

Thanks Omar!

 

This is great.  What a coincidence that you replied.  I am actually familiar with CORETIME, as I spoke with your team at SOLIDWORKS world this past February, any chance that you provide trial licenses so I could try this for myself?

 

Cheers,

Alex

By: Alexander Hunt  Wed, 14 Mar 2018 01:10:22 GMT
Re: Motion analysis sensors in design study - angular displacement

Hi Alexander.
Just to make sure you've recieved an answer.

 

CORTIME will be available for free for all students and professors using it for educational purposes.

 

Let us know if you need further information and we are of course happy to help.

 

All the best
/Rasmus Høtoft

By: Rasmus Høtoft Sørensen  Thu, 19 Apr 2018 14:05:20 GMT
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