×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Adams/Car 2005 and 2018

thread823-451743

Adams/Car 2005 and 2018

Adams/Car 2005 and 2018

(OP)
hello

I'm using an MSC model called mini-Baja that has been built in Adams/Car 2005 and anlysing it in Adams 2018 . Mind you , the files are ready on MSC Adams official site .

problem is that I can't get the exact results from Adams/car 2018 Postprocessing …( Minute differences ) the parameters I want are vertical chassis acceleration and chassis longitudinal velocity

no matter what I did from changing units to changing solver integrators ( to the best of my knowledge ) was nigh on futile ...

can you explain how this happens ? is it a matter of changing Solvers Integrators because I have tried almost all of them ? was there something in Msc /Adams car back in 2005 that is changed in 2018 ? if so what can i do to get the exact results ?

my results are very similar to the results of the model in 2005 but with minute differences ? what is the reason of those minute differences ?????

FYI : i'm running the model in File Driven Events and the Baja vehicle model has post-made files for that ...

thank you very much

RE: Adams/Car 2005 and 2018

There are incremental changes in the way that templates are turned into adm files, which is what the solver actually runs. So if you build a model in 2005 and 2108 you will probably find slight differences. The solver also changes between releases. MSC support may be inclined to help you with that.

When each new version came out we used to run standard models through them and check that the results were reasonably similar. They were often different. That discipline seems to have faded away, but at least it means we can run the later versions (2013 in my case).

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Adams/Car 2005 and 2018

(OP)


thanks anyway

so i have uploaded an image of my analysis(exact same model and tets File Driven 2018 ) and the result of the model itself in 2005

would you tell me if the diferences are normal ?
as you said the differences often happen so these minute diferences that i have circled with blue would be normal right ?

sorry to consume your time ...

also i detected that with the units being different in each model but resulting the same peaks in the gragh , the original model units might be wrong ( by the owner or builder of the model )

RE: Adams/Car 2005 and 2018

(OP)
what do I compare your file with ???

RE: Adams/Car 2005 and 2018

The adm from your model. adms are written in solver language, that pretty thing on your screen is no use to the solver. Export has several options for adams files, I think one is called adams solver dataset or something like that, you want a .adm file that looks similar to the one I posted.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?

RE: Adams/Car 2005 and 2018

With Greg here.

The model you are working with will be translated/exported to the form that the solver can understand. All it takes is for the MSC team to make some change in the the export scheme and you'll get a different result. As your GUI starts working with ever more abstract concepts, the direct mapping from GUI to solver disappears. You might find details in the release notes, if a subsystem's export method has been improved.

Steve

RE: Adams/Car 2005 and 2018

(OP)
thank you very much …

sorry for understanding your answer a bit late ...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!

Resources

eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now
Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close