Linking ADAMS/Car with ADAMS/View

jsph_inc over 1 year ago

Hi All,

Apologies if this has already been documented or discussed. I did a search but did not find anything on the topic.

What is the method(s) to link an ADAMS/Car model with an ADAMS/View model?

The only way I can think of is bringing both into Simulink and performing a cosimulation.

Is there a direct way within the ADAMS environment of doing this?

joe.

0 Rishikesh Mokashi over 1 year ago

Hi Joe

FMU is the best approach here. Here is an example :

Article Detail (hexagon.com)

Here differential is modeled using Adams/Machinery in View and a full vehicle model in Adams/Car.

Regards,

Rishi
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0 jsph_inc over 1 year ago

Thank-you Rishi! Will review. joe.
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0 Jesper Slattengren over 1 year ago

It's not ideal to co-simulate a mechanical system coupling in this way. Hopefully it will work, but there is a chance that the discretization of the coupling makes the system unstable. (But yes, FMU is the best way to do it for co-simulation; don't involve Simulink).

The other alternative is to create a template of your View model. The only downside I can see is that A/Machinery bearings are not supported in Car yet.

There are a few different ways to do it, but this is should work.

Save your View model as a cmd file.

Open A/Car template builder and create a new empty template. Save this. Edit the cmd file and remove the model create statement. Then search and replace all instances of the model name with the name of the template. Now you should be able to import this modified cmd into your template. Then go ahead and setup your communicators to work with the rest of your model.
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0 jsph_inc over 1 year ago

Thanks JSlat..I will try the FMU method.

I'm trying to run the example model from the link above.

When I try to solve the load case in ADAMS/Car I get the following error:

---- START: ERROR ----

The initialization of ESL test2_open_diff_fmu fails.

ID = 8

---- END: ERROR ----

I am using ADAMS version 2022.2

Any ideas about why this error occurs?

joe.
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0 Jesper Slattengren over 1 year ago

I don't even know what state the FMU import/export was in that old version. Try a later version.

Another possibility is that the FMU can't check out Adams licenses. The FMU will run in its own process and will take a full set of licenses.
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0 jsph_inc over 1 year ago

Thanks for the quick response. OK will test this out thanks. joe.
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0 jsph_inc over 1 year ago

I was able to solve the example in the link above.

In reviewing the results I see the full set of A/Car outputs but very limited results for the A/View model (and only when I import the results into the A/View model). I only see some A/View joint forces.

I tried different output settings in A/View and A/Car for this but didn't seem to help.

Is there a way to write out and view the full set of A/View results for the process in this example ... including graphic results of the A/View model?

thanks for any help,

joe.
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0 Jesper Slattengren over 1 year ago

OK, so you used the FMU approach. So you will get all the results from the Car model. And you have found the results file from the unpacked FMU for the View model. Correct?

Well, you have to define in the View model what outputs you want. Results, graphics and request files. Adams/View does not automatically create requests for all elements in the way Car does it, so you have to define all requests manually in the View model.

You will never be able to animate both models at the same time, at least not in Adams PPT (well you could load both models, bit results or graphics files and animate in separate views).

Was the simulation successful? No strange discretization problem? Stable results?

One thing I'm currently working on is stability of co-simulations and that includes FMU connections. So we are very interested in what you are doing. Anything you can tell us can help us create a better interface in Adams.
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0 jsph_inc over 1 year ago

Thanks JSlat ....problem solved. I didn't realized the ADAMS/View result files are written to the folder <working_directory>\fmu\test\resources. That's what I was looking for as I was just seeing the A/Car result files.

The example model solved with no strange results..though this was just a rerun of the MSC example model.

Will likely use this FMU method so I can keep you posted on any suggestions.

thanks again,

joe.
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0 Jesper Slattengren over 1 year ago

Much appreciated.
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