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Professional CAD/CAM tools built on Inventor and AutoCAD
Integrated BIM tools, including Revit, AutoCAD, and Civil 3D
Professional CAD/CAM tools built on Inventor and AutoCAD
Transcript
00:02
Generative Design loads and constraints.
00:05
In this video, we will apply a load, apply a constraint and will clone a load case.
00:12
In Fusion 360, you can carry on with your own design or you can upload the supply Generative Design geometry setup V5.
00:20
The first thing that we're going to do is we are going to rename Load Case1 by selecting it and then left clicking again.
00:26
We're going to call this our static load.
00:30
We're going to assume that the motorcycle is completely compressed from both ends and statically loaded.
00:37
In order to do that, let's expand the loads and notice that gravity is already applied.
00:42
You can see at the rear wheel at the origin of our coordinate system that gravity is pointing down, so the orientation is correct.
00:49
But we want to go ahead and apply the constraints on our frame to define the rest of our loading.
00:55
We're going to start by adding a structural constraint and because this might be difficult with all of the other geometry included,
01:01
I'm going to hide my Obstacle Geometry. So that way I'm only looking at the rest of the geometry as well as our Preserve regions.
01:10
So for our fixed constraint, we're going to be taking a look at our frame mounts,
01:15
and I'm going to include a fixed constraint on the inside of my frame mounts in all three directions.
01:22
When we're making our loads and constraints for a Generative Design study,
01:26
it is extremely important that we accurately represent the real world because I’m treating this as a structural frame member,
01:35
I’m going to assume that all these points are going to be fixed for the rest of my design,
01:39
and I'll be loading the rear shock as well as the front stem.
01:43
However, for your designs, you need to make sure that you do replicate those real-world scenarios.
01:49
Let's go ahead and hide the Obstacle Geometry again and note that we have an Unassigned Geometry section which we can hide all Unassigned Geometry.
01:58
This once again will help us quickly and easily see just the geometry of interest.
02:03
Now that we have our fixed constraint. Let's talk about applying those static loads.
02:08
We're going to do this by going to structural loads, and we're going to apply a force to the bottom of the steering stem.
02:15
When the suspension is compressed at the front of the motorcycle,
02:19
the load is applied to the steering stem of the frame, through the forks and through the triple clamp.
02:24
We're going to assume that we have a 30 kN force.
02:28
So this is going to be 30,000 or 30,000 Newtons.
02:33
And it's going to be pointing in the direction of our stem.
02:37
Next, we need to incorporate a load at the rear shock.
02:40
So I'm going to use the right click marking menu to repeat the structural loads,
02:44
and I'm going to place the load on the inside faces for both of these.
02:49
In reality, this is going to be a bearing load.
02:53
Now the bearing load is going to be applied just across the upper section or the direction of the load being applied,
03:00
and it is a parabolic distribution, It's not going to be entirely applied to those faces,
03:05
but you'll note that we have arrows that are currently pointing down.
03:09
We need these to point up and in the direction of the shock.
03:13
In our case, the shock is at about 175 degrees but with the orientation of this load, it's going to be -185.
03:22
The load that we're going to apply is 24,675 Newtons.
03:28
We're going to say Okay, and now we have the load applied for our rear shock and for the front forks.
03:34
This only accounts for our first load case which is our static loading.
03:39
What we want to do at this point is we want to now incorporate some additional loading that's going to happen on the front of the motorcycle,
03:46
while the rear of the motorcycle with a single shock is going to remain relatively the same in terms of the loading conditions,
03:53
what we will see is that the front is going to encounter braking forces as well as torsion from leaning.
04:00
So we're going to right click on static, and we're going to select Clone Load Case.
04:05
When we clone a load case, we need to activate it, and we need to take a look at what was brought forward.
04:12
The constraints that we applied for our motor mounts as well as the force and the bearing load.
04:18
What we want to do from here is we want to modify the force that's applied to the forks.
04:23
So the first thing that I want to do is I want to rename Static1. This is going to be my Torsion load.
04:29
So this torsion load is not going to be a single force applied to the bottom face.
04:34
So what I want to do is either delete or suppress this force.
04:38
We can suppress it by clicking on the checkmark in the box to the left or we can right click and delete it altogether.
04:45
Then I want to apply a structural load.
04:48
What I'm going to do at this point is I'm going to take a load and apply it to the upper face of the stem in one direction.
04:56
So I'm going to rotate this around to -90 degrees, and we can manually enter -90 if it's easier.
05:03
Keeping in mind that we are using a force which will be applied to the entire outside of this face,
05:08
We could include this as a bearing load, which would only apply to half of it.
05:14
If we want to change that to a bearing load, note that the direction also changes.
05:19
So I'm going to set this to -90, so it's pointing to the left, and we're going to include a load in this case of 15,000 Newtons.
05:29
So we're going to set this at 15,000, And that's 15,000 pointing to the -X Direction.
05:38
We need to apply that same load in the opposite direction on the bottom
05:42
Or what we can do is we can take this torsion load which I'll rename as Torsion, T for top, we can right click on it and we can copy it.
05:52
Now if we copy a load, and then we right click and we paste the load.
05:57
Notice that we don't have the same option that we did when we try to clone it.
06:01
We don't have the same ability to just simply take a load and copy it over as we do the entire load case.
06:09
What we want to do is we want to go to the top of the loads, and we want to select Paste.
06:13
Now this gives us the available option to rename it and modify what was selected in the direction.
06:20
Now that we have Torsion L, we can edit, we're going to change the face target to this bottom face,
06:26
and we want to change the direction, so that it's pointing to the right or positive 90 degrees.
06:31
Now what we've done is we've created a second load case that looks at twisting the front position of the frame.
06:38
We're going to take this torsion, and we're going to clone this load case.
06:42
Once it's clone, again we're going to activate it. We're going to rename it.
06:46
And instead of Torsion 1, we're going to call this one Torsion 2, and then we want to modify the load cases.
06:53
We're going to modify the torsion at the top to be positive 90 degrees,
06:57
so it's pointing to the right, and we'll modify Torsion L at the bottom to be negative 90 degrees, so it's pointing to the other direction.
07:07
Now that we've accounted for our static loading, which is just completely fully compressed rear suspension and front suspension,
07:14
and we've incorporated some Torsion that's introduced into the frame.
07:19
We now need to take into account some breaking loads.
07:22
Breaking loads, we can simply take this Torsion load case, and we can clone it as well,
07:26
and then we're going to rename the new load case to be a breaking load.
07:30
So we want to activate it, we'll call this one breaking, and in the case of the breaking load case, we're going to take that Torsion Top.
07:38
And when we have the Torsion Top, what we're doing is we're actually going to be having a load pointing forward on the frame.
07:47
So if we were to point this forward, it's going to go to 0 degrees.
07:51
The load in this case will simply keep at 15,000 Newtons,
07:55
and then we want to modify the Torsion L or the Torsion Lower, and this one is going to be pointing backwards.
08:02
And the reason that we do this is because in reality when the front wheel of the motorcycle is breaking,
08:07
it's compressing but it's also pushing backwards on this lower section.
08:12
And based on the mechanics of the frame, it's actually going to be introducing a little bit of tension in the top section of the frame.
08:20
So while these numbers might be higher than expected or might be the inclusion of some additional loading.
08:27
This gives us a very good representation of statically loading,
08:31
twisting the frame about the Z-axis left and right and also twisting the front about the X-axis under braking.
08:39
Again, there are more loads, and we're not taking a look at all of the dynamic loads are included on a motorcycle frame,
08:45
but this will allow us to understand the process and give us a good result.
08:50
So from here, let's make sure that we do save our design.
08:53
I am going to leave the obstacle geometry hidden, but I want to make sure that I do save this design before moving on.
Video transcript
00:02
Generative Design loads and constraints.
00:05
In this video, we will apply a load, apply a constraint and will clone a load case.
00:12
In Fusion 360, you can carry on with your own design or you can upload the supply Generative Design geometry setup V5.
00:20
The first thing that we're going to do is we are going to rename Load Case1 by selecting it and then left clicking again.
00:26
We're going to call this our static load.
00:30
We're going to assume that the motorcycle is completely compressed from both ends and statically loaded.
00:37
In order to do that, let's expand the loads and notice that gravity is already applied.
00:42
You can see at the rear wheel at the origin of our coordinate system that gravity is pointing down, so the orientation is correct.
00:49
But we want to go ahead and apply the constraints on our frame to define the rest of our loading.
00:55
We're going to start by adding a structural constraint and because this might be difficult with all of the other geometry included,
01:01
I'm going to hide my Obstacle Geometry. So that way I'm only looking at the rest of the geometry as well as our Preserve regions.
01:10
So for our fixed constraint, we're going to be taking a look at our frame mounts,
01:15
and I'm going to include a fixed constraint on the inside of my frame mounts in all three directions.
01:22
When we're making our loads and constraints for a Generative Design study,
01:26
it is extremely important that we accurately represent the real world because I’m treating this as a structural frame member,
01:35
I’m going to assume that all these points are going to be fixed for the rest of my design,
01:39
and I'll be loading the rear shock as well as the front stem.
01:43
However, for your designs, you need to make sure that you do replicate those real-world scenarios.
01:49
Let's go ahead and hide the Obstacle Geometry again and note that we have an Unassigned Geometry section which we can hide all Unassigned Geometry.
01:58
This once again will help us quickly and easily see just the geometry of interest.
02:03
Now that we have our fixed constraint. Let's talk about applying those static loads.
02:08
We're going to do this by going to structural loads, and we're going to apply a force to the bottom of the steering stem.
02:15
When the suspension is compressed at the front of the motorcycle,
02:19
the load is applied to the steering stem of the frame, through the forks and through the triple clamp.
02:24
We're going to assume that we have a 30 kN force.
02:28
So this is going to be 30,000 or 30,000 Newtons.
02:33
And it's going to be pointing in the direction of our stem.
02:37
Next, we need to incorporate a load at the rear shock.
02:40
So I'm going to use the right click marking menu to repeat the structural loads,
02:44
and I'm going to place the load on the inside faces for both of these.
02:49
In reality, this is going to be a bearing load.
02:53
Now the bearing load is going to be applied just across the upper section or the direction of the load being applied,
03:00
and it is a parabolic distribution, It's not going to be entirely applied to those faces,
03:05
but you'll note that we have arrows that are currently pointing down.
03:09
We need these to point up and in the direction of the shock.
03:13
In our case, the shock is at about 175 degrees but with the orientation of this load, it's going to be -185.
03:22
The load that we're going to apply is 24,675 Newtons.
03:28
We're going to say Okay, and now we have the load applied for our rear shock and for the front forks.
03:34
This only accounts for our first load case which is our static loading.
03:39
What we want to do at this point is we want to now incorporate some additional loading that's going to happen on the front of the motorcycle,
03:46
while the rear of the motorcycle with a single shock is going to remain relatively the same in terms of the loading conditions,
03:53
what we will see is that the front is going to encounter braking forces as well as torsion from leaning.
04:00
So we're going to right click on static, and we're going to select Clone Load Case.
04:05
When we clone a load case, we need to activate it, and we need to take a look at what was brought forward.
04:12
The constraints that we applied for our motor mounts as well as the force and the bearing load.
04:18
What we want to do from here is we want to modify the force that's applied to the forks.
04:23
So the first thing that I want to do is I want to rename Static1. This is going to be my Torsion load.
04:29
So this torsion load is not going to be a single force applied to the bottom face.
04:34
So what I want to do is either delete or suppress this force.
04:38
We can suppress it by clicking on the checkmark in the box to the left or we can right click and delete it altogether.
04:45
Then I want to apply a structural load.
04:48
What I'm going to do at this point is I'm going to take a load and apply it to the upper face of the stem in one direction.
04:56
So I'm going to rotate this around to -90 degrees, and we can manually enter -90 if it's easier.
05:03
Keeping in mind that we are using a force which will be applied to the entire outside of this face,
05:08
We could include this as a bearing load, which would only apply to half of it.
05:14
If we want to change that to a bearing load, note that the direction also changes.
05:19
So I'm going to set this to -90, so it's pointing to the left, and we're going to include a load in this case of 15,000 Newtons.
05:29
So we're going to set this at 15,000, And that's 15,000 pointing to the -X Direction.
05:38
We need to apply that same load in the opposite direction on the bottom
05:42
Or what we can do is we can take this torsion load which I'll rename as Torsion, T for top, we can right click on it and we can copy it.
05:52
Now if we copy a load, and then we right click and we paste the load.
05:57
Notice that we don't have the same option that we did when we try to clone it.
06:01
We don't have the same ability to just simply take a load and copy it over as we do the entire load case.
06:09
What we want to do is we want to go to the top of the loads, and we want to select Paste.
06:13
Now this gives us the available option to rename it and modify what was selected in the direction.
06:20
Now that we have Torsion L, we can edit, we're going to change the face target to this bottom face,
06:26
and we want to change the direction, so that it's pointing to the right or positive 90 degrees.
06:31
Now what we've done is we've created a second load case that looks at twisting the front position of the frame.
06:38
We're going to take this torsion, and we're going to clone this load case.
06:42
Once it's clone, again we're going to activate it. We're going to rename it.
06:46
And instead of Torsion 1, we're going to call this one Torsion 2, and then we want to modify the load cases.
06:53
We're going to modify the torsion at the top to be positive 90 degrees,
06:57
so it's pointing to the right, and we'll modify Torsion L at the bottom to be negative 90 degrees, so it's pointing to the other direction.
07:07
Now that we've accounted for our static loading, which is just completely fully compressed rear suspension and front suspension,
07:14
and we've incorporated some Torsion that's introduced into the frame.
07:19
We now need to take into account some breaking loads.
07:22
Breaking loads, we can simply take this Torsion load case, and we can clone it as well,
07:26
and then we're going to rename the new load case to be a breaking load.
07:30
So we want to activate it, we'll call this one breaking, and in the case of the breaking load case, we're going to take that Torsion Top.
07:38
And when we have the Torsion Top, what we're doing is we're actually going to be having a load pointing forward on the frame.
07:47
So if we were to point this forward, it's going to go to 0 degrees.
07:51
The load in this case will simply keep at 15,000 Newtons,
07:55
and then we want to modify the Torsion L or the Torsion Lower, and this one is going to be pointing backwards.
08:02
And the reason that we do this is because in reality when the front wheel of the motorcycle is breaking,
08:07
it's compressing but it's also pushing backwards on this lower section.
08:12
And based on the mechanics of the frame, it's actually going to be introducing a little bit of tension in the top section of the frame.
08:20
So while these numbers might be higher than expected or might be the inclusion of some additional loading.
08:27
This gives us a very good representation of statically loading,
08:31
twisting the frame about the Z-axis left and right and also twisting the front about the X-axis under braking.
08:39
Again, there are more loads, and we're not taking a look at all of the dynamic loads are included on a motorcycle frame,
08:45
but this will allow us to understand the process and give us a good result.
08:50
So from here, let's make sure that we do save our design.
08:53
I am going to leave the obstacle geometry hidden, but I want to make sure that I do save this design before moving on.
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