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Transcript
00:00
In this video, you’ll interpret common errors and warnings and predict their impact,
00:07
conclude whether common errors and warnings violate the constraints of a linear static analysis,
00:13
take appropriate action to address common errors and warnings,
00:18
generate and inspect mesh elements for a study,
00:22
and ensure that the Pre-check information aligns with analysis plan.
00:28
Using the optional Pre-check feature before an analysis
00:33
verifies the study to ensure that all required analysis settings are applied,
00:38
so the study can be solved.
00:41
While Pre-check will detail missing elements,
00:44
always review inputs yourself to ensure that the intended simulation is being solved.
00:51
To begin, open the file Simulation Pre-check.f3d and activate the Simulation workspace.
01:00
On the Toolbar, in the Solve panel,
01:04
the Pre-Check button graphically indicates the status of the simulation setup,
01:10
even before you actually click it.
01:12
An exclamation mark on a red background indicates that there are issues
01:17
with the study inputs, and that the study cannot be solved.
01:23
An exclamation mark on a yellow background informs you that there are potential issues.
01:30
The study can be solved, but the solver may issue warnings or errors.
01:36
This state is a warning and may be simply pointing out that the setup is not common.
01:42
A check mark on a green background means that there are no issues, and that the study can be solved.
01:49
Select Pre-check.
01:52
The Cannot Solve dialog displays, which contains a list of errors detected in the setup.
01:59
You can see that there are insufficient structural constraints.
02:03
Also, because there are no loads, all forces are in equilibrium.
02:09
These issues must be addressed if you wish to compute this study.
02:14
Close the dialog.
02:16
First, to address the insufficient structural constraints, add pin constraints.
02:23
From the Toolbar, expand Constraints and select Structural Constraints.
02:30
The Structural Constraints dialog displays.
02:34
Expand the Type drop-down and select Pin.
02:38
Then, in the canvas, select both rear cylindrical faces of the model.
02:45
For the sake of this demonstration, deliberately leave the axial translation
02:50
and tangential rotation degrees of freedom deselected for both pin holes.
02:57
Click OK.
02:59
Now, to address the forces in equilibrium, add a bearing load onto the end.
03:06
From the Toolbar, expand Loads.
03:10
Select Structural Loads.
03:13
In the Structural Loads dialog, expand the Type drop-down and select Bearing Load.
03:20
Then, in the canvas, select the front cylindrical face.
03:25
Back in the dialog, edit the Direction Type to Vectors (x, y, z).
03:31
Then, in the Fx field, enter 20,000.
03:36
Click OK.
03:39
Click Pre-check to run the Pre-check again.
03:43
The Ready to Solve with Warnings dialog displays
03:47
and still indicates that there are insufficient structural constraints.
03:52
While you can deduce that there are no axial forces in the model,
03:56
and therefore the model should stay still, the solver must be told this explicitly.
04:03
Close the dialog.
04:06
You can control the rigid body motion in the axial direction
04:10
by locking the axial degree of freedom in one of the pin constraints.
04:16
To do so, in the Browser, expand Constraints and then right-click Pin1.
04:24
From the shortcut menu, select Edit Structural Constraint.
04:30
In the Structural Constraints dialog, enable Axial to lock the axial degree of freedom.
04:37
Click OK.
04:39
Repeat this process for Pin4.
04:43
Now in the Toolbar, the Pre-Check indicates that there are no issues and that the study can be solved.
04:52
Click Pre-check, and a dialog indicates that the study is Ready to Solve.
04:58
Click OK to close the dialog.
05:01
Before moving on, it is important to be aware that, in Stress Analysis,
05:08
results are highly dependent on the quality of the mesh being used.
05:12
Therefore, you must generate the mesh with the current settings.
05:17
In the Browser, right-click Mesh and, from the shortcut menu, select Generate Mesh.
05:25
You can see that, while a mesh does exist, it is very rough.
05:32
The results will be calculated quickly, but they may not have sufficient accuracy for a first pass solution.
05:40
To refine the mesh, from the Browser, right-click Mesh and select Mesh Settings.
05:47
In the Mesh Settings dialog, under Average Element Size,
05:53
use the slider to reduce the Average Element Size to 2%.
05:59
Click OK.
06:01
A warning dialog displays, that the fine mesh size will lead to high memory consumption.
06:07
Click Yes to continue.
06:10
Now you can regenerate the mesh.
06:13
Again, from the Browser, right-click Mesh and select Generate Mesh.
06:19
A progress dialog displays as the mesh generates.
06:24
Solve the analysis.
06:26
From the Toolbar, Solve panel, select Solve.
06:30
The Solve dialog displays.
06:34
Click Solve.
06:35
The Job Status dialog shows you the progress of the study.
06:40
When it is complete, close the dialog.
06:43
The results display in the canvas.
06:46
Here, however, you can see that the stress results are not being accurately computed.
06:54
This is because there is a rigid body mode not previously accounted for
06:59
that was not detected by Pre-check.
07:03
To inspect this, from the Toolbar, Result Tools panel, select Animate.
07:10
In the Animate dialog, enable Two-way to make the movement of the model more conspicuous.
07:16
Then, expand the Speed drop-down and select Fastest.
07:22
Click Play.
07:24
The model moves rigidly.
07:26
As you can see, the rotational degree of freedom
07:30
of the pin constraints in the back of the model is not fixed.
07:34
Click OK.
07:36
From the Toolbar, select Finish Results.
07:40
Lastly, you must edit the pin constraints and restrict rotation about the axis.
07:48
From the Browser, right-click Pin1 and select Edit Structural Constraint.
07:55
From the dialog, select Tangential to lock the remaining degree of freedom.
08:02
Click OK to repeat this for Pin2.
08:06
Solve the study once more.
08:08
The results reveal a much more reasonable stress distribution.
08:12
This is because all rigid body modes have been adequately controlled.
08:18
Save the model.
Video transcript
00:00
In this video, you’ll interpret common errors and warnings and predict their impact,
00:07
conclude whether common errors and warnings violate the constraints of a linear static analysis,
00:13
take appropriate action to address common errors and warnings,
00:18
generate and inspect mesh elements for a study,
00:22
and ensure that the Pre-check information aligns with analysis plan.
00:28
Using the optional Pre-check feature before an analysis
00:33
verifies the study to ensure that all required analysis settings are applied,
00:38
so the study can be solved.
00:41
While Pre-check will detail missing elements,
00:44
always review inputs yourself to ensure that the intended simulation is being solved.
00:51
To begin, open the file Simulation Pre-check.f3d and activate the Simulation workspace.
01:00
On the Toolbar, in the Solve panel,
01:04
the Pre-Check button graphically indicates the status of the simulation setup,
01:10
even before you actually click it.
01:12
An exclamation mark on a red background indicates that there are issues
01:17
with the study inputs, and that the study cannot be solved.
01:23
An exclamation mark on a yellow background informs you that there are potential issues.
01:30
The study can be solved, but the solver may issue warnings or errors.
01:36
This state is a warning and may be simply pointing out that the setup is not common.
01:42
A check mark on a green background means that there are no issues, and that the study can be solved.
01:49
Select Pre-check.
01:52
The Cannot Solve dialog displays, which contains a list of errors detected in the setup.
01:59
You can see that there are insufficient structural constraints.
02:03
Also, because there are no loads, all forces are in equilibrium.
02:09
These issues must be addressed if you wish to compute this study.
02:14
Close the dialog.
02:16
First, to address the insufficient structural constraints, add pin constraints.
02:23
From the Toolbar, expand Constraints and select Structural Constraints.
02:30
The Structural Constraints dialog displays.
02:34
Expand the Type drop-down and select Pin.
02:38
Then, in the canvas, select both rear cylindrical faces of the model.
02:45
For the sake of this demonstration, deliberately leave the axial translation
02:50
and tangential rotation degrees of freedom deselected for both pin holes.
02:57
Click OK.
02:59
Now, to address the forces in equilibrium, add a bearing load onto the end.
03:06
From the Toolbar, expand Loads.
03:10
Select Structural Loads.
03:13
In the Structural Loads dialog, expand the Type drop-down and select Bearing Load.
03:20
Then, in the canvas, select the front cylindrical face.
03:25
Back in the dialog, edit the Direction Type to Vectors (x, y, z).
03:31
Then, in the Fx field, enter 20,000.
03:36
Click OK.
03:39
Click Pre-check to run the Pre-check again.
03:43
The Ready to Solve with Warnings dialog displays
03:47
and still indicates that there are insufficient structural constraints.
03:52
While you can deduce that there are no axial forces in the model,
03:56
and therefore the model should stay still, the solver must be told this explicitly.
04:03
Close the dialog.
04:06
You can control the rigid body motion in the axial direction
04:10
by locking the axial degree of freedom in one of the pin constraints.
04:16
To do so, in the Browser, expand Constraints and then right-click Pin1.
04:24
From the shortcut menu, select Edit Structural Constraint.
04:30
In the Structural Constraints dialog, enable Axial to lock the axial degree of freedom.
04:37
Click OK.
04:39
Repeat this process for Pin4.
04:43
Now in the Toolbar, the Pre-Check indicates that there are no issues and that the study can be solved.
04:52
Click Pre-check, and a dialog indicates that the study is Ready to Solve.
04:58
Click OK to close the dialog.
05:01
Before moving on, it is important to be aware that, in Stress Analysis,
05:08
results are highly dependent on the quality of the mesh being used.
05:12
Therefore, you must generate the mesh with the current settings.
05:17
In the Browser, right-click Mesh and, from the shortcut menu, select Generate Mesh.
05:25
You can see that, while a mesh does exist, it is very rough.
05:32
The results will be calculated quickly, but they may not have sufficient accuracy for a first pass solution.
05:40
To refine the mesh, from the Browser, right-click Mesh and select Mesh Settings.
05:47
In the Mesh Settings dialog, under Average Element Size,
05:53
use the slider to reduce the Average Element Size to 2%.
05:59
Click OK.
06:01
A warning dialog displays, that the fine mesh size will lead to high memory consumption.
06:07
Click Yes to continue.
06:10
Now you can regenerate the mesh.
06:13
Again, from the Browser, right-click Mesh and select Generate Mesh.
06:19
A progress dialog displays as the mesh generates.
06:24
Solve the analysis.
06:26
From the Toolbar, Solve panel, select Solve.
06:30
The Solve dialog displays.
06:34
Click Solve.
06:35
The Job Status dialog shows you the progress of the study.
06:40
When it is complete, close the dialog.
06:43
The results display in the canvas.
06:46
Here, however, you can see that the stress results are not being accurately computed.
06:54
This is because there is a rigid body mode not previously accounted for
06:59
that was not detected by Pre-check.
07:03
To inspect this, from the Toolbar, Result Tools panel, select Animate.
07:10
In the Animate dialog, enable Two-way to make the movement of the model more conspicuous.
07:16
Then, expand the Speed drop-down and select Fastest.
07:22
Click Play.
07:24
The model moves rigidly.
07:26
As you can see, the rotational degree of freedom
07:30
of the pin constraints in the back of the model is not fixed.
07:34
Click OK.
07:36
From the Toolbar, select Finish Results.
07:40
Lastly, you must edit the pin constraints and restrict rotation about the axis.
07:48
From the Browser, right-click Pin1 and select Edit Structural Constraint.
07:55
From the dialog, select Tangential to lock the remaining degree of freedom.
08:02
Click OK to repeat this for Pin2.
08:06
Solve the study once more.
08:08
The results reveal a much more reasonable stress distribution.
08:12
This is because all rigid body modes have been adequately controlled.
08:18
Save the model.
Step-by-step guide
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