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Transcript
00:09
This unit will cover using subcases to compare different analyses.
00:16
So, we'll continue using this hitch that we set up in the prior unit.
00:20
What we'll be doing is looking at a different load direction.
00:23
So, so far, we have a gravity, a bearing load, a pin constraint and a receiver constraint.
00:29
What we want to do is look at a different load case or a different scenario.
00:33
So, this could be, the load is changing orientation.
00:36
It could be the load is changing magnitude.
00:38
Either way, the best way to approach this is with a new subcase.
00:42
If I were to create a new analysis, I would need to sort of start over with my idealizations and my mesh,
00:48
it's also more difficult to make sure that those are the same and consistent as you're applying new loads or constraints.
00:54
So, if the only thing changing is one of the boundary conditions, I recommend using a subcase instead of a new analysis.
01:01
The idealization. So, the solid elements, the material as well as the mesh size will remain the same.
01:07
But everything else here can be changed.
01:10
So, I'll go ahead and start by right clicking on "Subcase" and going to "New".
01:14
This is a dialogue box where I can choose which constraints or loads I would like to keep,
01:20
I don't need to keep any of them, but it's nice to add these back in if they're remaining the same.
01:27
So, what I'll do is I'll keep gravity.
01:29
So, I'll select "Gravity" from the list that's not going to change.
01:32
The bearing load, I'm going to leave out.
01:35
The reason is I'll be adding a new bearing load in a different direction or a different magnitude.
01:41
The pin constraint and receiver constraint.
01:43
I will select both of those since those will remain the same.
01:46
I'm not changing the way that this is attached to the vehicle.
01:50
I'm changing the direction of the load.
01:53
So, I'll select, "Ok".
01:54
Notice Subcase 1 is still there.
01:57
Subcase 2 has been added.
01:59
And if you'd like to have better visibility into what changes you're making,
02:03
I do recommend right clicking on "Subcase 1" and checking activate,
02:08
this will deactivate the subcase, it will turn gray and it will hide those loads.
02:15
So, I can see what I'm adding that's new.
02:17
Otherwise, they'll be added in on top of one another and it's very difficult to see what you're doing.
02:22
So, for Subcase 2, I'm going to add a new load.
02:27
And before I do anything, what I'm going to do is look at the subcase option box here where you see Subcase 1 and Subcase 2,
02:36
whichever one is selected is the one that will receive this new load.
02:41
So, I will activate Subcase 2 and deactivate Subcase 1, whichever one is blue is where this load will be added to.
02:49
I will rename the load.
02:57
Bearing.
02:58
Negative Z.
02:59
So, I know what it is.
03:01
I'll change my load to bearing load.
03:04
So, I'm changing the type, I'll select that same cylindrical face as before.
03:10
And then for my magnitude, I'm going to do negative 1,000 pound-force in the FZ box,
03:17
I'll turn the glasses on and it should look the same as what we've done before.
03:20
But now in the negative Z direction creating compression on that hitch.
03:26
So, I can verify that's all correct.
03:27
Again, make sure that Subcase 2 is selected and not Subcase 1 and then select "Ok".
03:34
And you'll notice that Subcase 1 remains the same.
03:37
Subcase 2 now has 1000 pound-force bearing negative Z.
03:40
Gravity is the same.
03:42
Constraints are the same.
03:43
So, now I'm ready to solve and compare the results.
Video transcript
00:09
This unit will cover using subcases to compare different analyses.
00:16
So, we'll continue using this hitch that we set up in the prior unit.
00:20
What we'll be doing is looking at a different load direction.
00:23
So, so far, we have a gravity, a bearing load, a pin constraint and a receiver constraint.
00:29
What we want to do is look at a different load case or a different scenario.
00:33
So, this could be, the load is changing orientation.
00:36
It could be the load is changing magnitude.
00:38
Either way, the best way to approach this is with a new subcase.
00:42
If I were to create a new analysis, I would need to sort of start over with my idealizations and my mesh,
00:48
it's also more difficult to make sure that those are the same and consistent as you're applying new loads or constraints.
00:54
So, if the only thing changing is one of the boundary conditions, I recommend using a subcase instead of a new analysis.
01:01
The idealization. So, the solid elements, the material as well as the mesh size will remain the same.
01:07
But everything else here can be changed.
01:10
So, I'll go ahead and start by right clicking on "Subcase" and going to "New".
01:14
This is a dialogue box where I can choose which constraints or loads I would like to keep,
01:20
I don't need to keep any of them, but it's nice to add these back in if they're remaining the same.
01:27
So, what I'll do is I'll keep gravity.
01:29
So, I'll select "Gravity" from the list that's not going to change.
01:32
The bearing load, I'm going to leave out.
01:35
The reason is I'll be adding a new bearing load in a different direction or a different magnitude.
01:41
The pin constraint and receiver constraint.
01:43
I will select both of those since those will remain the same.
01:46
I'm not changing the way that this is attached to the vehicle.
01:50
I'm changing the direction of the load.
01:53
So, I'll select, "Ok".
01:54
Notice Subcase 1 is still there.
01:57
Subcase 2 has been added.
01:59
And if you'd like to have better visibility into what changes you're making,
02:03
I do recommend right clicking on "Subcase 1" and checking activate,
02:08
this will deactivate the subcase, it will turn gray and it will hide those loads.
02:15
So, I can see what I'm adding that's new.
02:17
Otherwise, they'll be added in on top of one another and it's very difficult to see what you're doing.
02:22
So, for Subcase 2, I'm going to add a new load.
02:27
And before I do anything, what I'm going to do is look at the subcase option box here where you see Subcase 1 and Subcase 2,
02:36
whichever one is selected is the one that will receive this new load.
02:41
So, I will activate Subcase 2 and deactivate Subcase 1, whichever one is blue is where this load will be added to.
02:49
I will rename the load.
02:57
Bearing.
02:58
Negative Z.
02:59
So, I know what it is.
03:01
I'll change my load to bearing load.
03:04
So, I'm changing the type, I'll select that same cylindrical face as before.
03:10
And then for my magnitude, I'm going to do negative 1,000 pound-force in the FZ box,
03:17
I'll turn the glasses on and it should look the same as what we've done before.
03:20
But now in the negative Z direction creating compression on that hitch.
03:26
So, I can verify that's all correct.
03:27
Again, make sure that Subcase 2 is selected and not Subcase 1 and then select "Ok".
03:34
And you'll notice that Subcase 1 remains the same.
03:37
Subcase 2 now has 1000 pound-force bearing negative Z.
03:40
Gravity is the same.
03:42
Constraints are the same.
03:43
So, now I'm ready to solve and compare the results.
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