Learning Forum

[Fabricio.Urquhart]

Hello,

I would like to know if it happens with other people. When I change the parameters of my model, the slices are losed. As you see in the picture below. So I have to do every slices again.

Every time I have to do it. Is there any problem that I am not finding?

 

[Sandeep Medikonda]

When you say slices, do you mean the shared topology faces? what are these parameters? if it is the dimensions of the model I am not surprised as the parts are being regenerated.

Regards,

Sandeep

[peteroznewman]

Fabricio,

In one of your recent models, I counted 233 parameters.

I don't believe you have 233 independent parameters. I expect there is a short list of a few (tens of) parameters that are truly independent.

I expect many planes that are created for slicing are dependent on some other plane that is driven by an independent parameter.

You need to construct the DM geometry so the independent parameters are used directly in many plane constructions for slicing.

That will reduce the number of parameters showing up in Mechanical.

Regards,

Peter

 

 

[Fabricio.Urquhart]

Peter,

Actually I have 18 parameters.

But a lot of dimensions that depends on the parameters. I think that I am doing something wrong. For example, if I have a dimension that depends on one parameters, this dimension is not necessary a parameter. So I reduce the parameters to 18. I think that it is the error, isn't it?

Below is the list of parameters, and between the parameters and the dimensios which depend on parametrs, there is a line between them.

 

[Fabricio.Urquhart]

Another question that I have, is about the table of design points.

I have 18 design points. So I have run all of them, but sometimes I need to check the stress results of someone, and I have to run again.

I thought that the design points when you run one time, it is not necessary to run again. The result would be saved. But no, I have to run again. Do you know if is there any option to do not need to run again?

 

[peteroznewman]

Fabricio,

In DM in the Design Parameters tab, delete the 215 rows below the # row. You only want to see 18 rows for the independent parameters. The other tab, Parameters/Dimension Assignments is where the 233 assignments to dimensions are made using formulas based on the 18 independent parameters.

You also coincidentally want to do 18 runs in the Parameter Set in Workbench. Once you delete all those rows, there will be far fewer columns in the Parameter Set. The third last column is Retain, and if you check that, all runs will be saved and you can access all the plots in Mechanical by right clicking on a row and picking Set as Current.

 
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[Fabricio.Urquhart]

Thank you Peter.

Another question, I check the number 1 or 2?Because I have checked all retain for each row, but the first row (number 1 in the picture) I did not check. I think that because this that it did not save.

Thank you.

[peteroznewman]

Check 1 means to check all, which is handy if you have 18 rows. When you don't want all the rows checked, you can selectively check them in section 2.

[Fabricio.Urquhart]

Ok. 

But I check all the rows individually, and it did not save the results. At night I will check again.

 

 

[peteroznewman]

First check all, then Update All Design Points.  Workbench will solve each row and the results are saved for the checked rows.

[Fabricio.Urquhart]

Peter, I when I click on update all design points, I have the picture below:

 

I would like, to see the stress pictures in the results of each model with different parameters. Some parameters change the geometry for example, but I thought that the result were saved, but it seems to not.

 

[Fabricio.Urquhart]

Now I checked the option "Update full project". I am waiting, it is processing. But in first moment, it looks like it will work...

[Fabricio.Urquhart]

Peter,

As I said before, the parameters change de geometry, some change completely, others not. So if I run each one separated, it is OK. But with the full project uptade, there are some errors.

Which, I think, thate are because the share topology, that happens the problem in the first post. But I am not sure.

[Fabricio.Urquhart]

Peter, the problem is: there are some "probe point results", that were lost with the change of parameters values. I am looking for another way to take the deformation results in these points.

[Fabricio.Urquhart]

Peter, is there anway to delete all selected rows in the design parameters Tab?Because yesterday I have deleted row by row, it takes a long time.

[peteroznewman]

Fabricio,

Row-by-row is the only way I know to delete unnecessary design parameters.

Replace the probe point results with results at a coordinate system that can move with the parameter values. Or if you have a vertex, edge or face you can select.

Some rows can have parameter values that create a model that will not converge to the full load, so the Solution component of the update fails. You would see the failure to converge when you are running with that model open in Mechanical. You have to modify the Automatic Time Stepping controls to help this model converge to the full load.

Regards,

Peter

[Fabricio.Urquhart]

Peter,

I think that the problem is the bolt's preload. Because it changes depending on the bolt diameter. Is it possible to parametrize the load dependent on the parameter diameter?

Another question. If I run the models separated, with differents preloads, the results will be saved, despite the load is different?

[peteroznewman]

Fabricio,

If you add the bolt preload as a parameter it will show up as a column in the Parameter Set. Then you can enter the value you want based on the diameter of the bolt that is in another column. I don't know if you can use an equation, but you only have 18 rows, so that is manageable.

If you separate the models by doing File, Save As and create a new Workbench Project, then yes, each file can have it's own Preload and saved results.

Regards,

Peter

[Fabricio.Urquhart]

Peter, I saved as an did all the models. When I create a new parameter, it is possible to create only geometric parameters. As pre-load is not a geometric parameter, I could not do it.

I will create another post with some doubts about extracting the results.

 

Thank you!!

[peteroznewman]

Fabricio,

What shows up in the Workbench Parameter Set is a mixture of Geometric Parameters that come from DesignModeler (or SpaceClaim) and Model Parameters that come from Mechanical.  Don't bother trying to create a Parameter in DesignModeler and expect to use it in Mechanical.  It doesn't work that way.

In Mechanical, if you see a box, you can click that box and a P will appear and cause that value to show up in the Parameter Set. There is such a box next to the Preload field in Bolt Pretension.

Regards,

Peter

[Fabricio.Urquhart]

Peter,

I did not find this box next to the preload field in bolt pretension.

[peteroznewman]

That's because you are at Step 3, when the Preload is Locked.

You can only add the Preload as a Parameter when you are at Step 1, when the Preload value can be entered.

[Fabricio.Urquhart]

Peter, at step 1 I did not find the box, too. Where is t?

[peteroznewman]

Fabricio,

I am learning too and I just remembered... Parameters are not available in multi-step solutions. Sorry.

If any members knows how to implement a size-dependent Bolt Preload in a multi-step solution, I would like to know also.

Regards,

Peter

[Fabricio.Urquhart]

Peter,

I think that I have a problem with shared topology. I posted in this  topic.

 

Regards.

Fabricio

[peteroznewman]

You should review this post.  It talks about having Parameters in Multistep solutions.