- [Instructor] We've previously created the geometry splits
and used them in the meshing
in preparation with setting up the 3-2-1 constraints.
We'll now create those constraints
and also apply the balancing loads
at the big end and the little end.
It's easier to apply the boundary conditions
with just the geometry in view,
so right mouse click on Mesh and select Hide Mesh.
We go to Fixtures, right mouse click
and choose Fixed Geometry.
The first point where we're going to apply constraints
uses constraints in the X, Y, and Z transitional directions.
That's going to be a point just down here.
Let's zoom in tightly to that first vertex region.
If we just roll the model,
and manipulate the view until the vertex
is right on the edge of the con rod,
this increases the chance of a clean pick.
Select that vertex.
Open up the Advanced options.
Select the Front Plane as a Reference plane.
You need to open up the Geometry feature tree,
Front Plane is what we want to use.
Now we see the X, Y, and Z direction shown in turn.
X is Along Plane Direction 1,
which is why we've chosen the Front Plane.
Y is Along Plane Direction 2, and Z is Normal to the Plane.
This all aligns with the directions we're expecting.
Let's check these in turn.
We want this one,
this one,
and this one, each one will be repeating.
We see the label here is telling us
that we have zero deflections.
We're imposing a deflection of zero,
which is the same thing as applying a constraint.
Check OK.
Under Fixtures, if we hover over it,
we can see there's a label saying
Translations in X, Y, and Z are zero.
That's a very useful confirmation.
Let's rename this fixture as 3 DOF, that just reminds us
we've applied three degrees of freedom in X, Y, and Z.
This is a three set out of the 3-2-1 complete set.
Right mouse click on Fixtures again, select Fixed Geometry.
The second point we want to create
is the top of the con rod.
Let's pick the standard view, Spacebar, standard,
then we can manipulate,
we want to zoom into this vertex here.
If we try and pick a clean view,
we maximize the chance of hitting that vertex.
That's the one we want.
Then we open up Advanced.
Again, we pick the same Plane,
just going to be the Front Plane.
This time, we want to open up the X and Z directions,
which is going to be the first box here,
just set that to zero,
and again, it's the direction Along Directional Plane 1,
which is X.
We missed Y and we pick Z.
Just to confirm, that's the direction, and just hover here,
it says Normal to Plane.
That's the two degrees of freedom we've selected there.
Again, we just check OK.
Again, we hover,
we can see confirmation X and Z both set to zero.
Click in here, and rename it as 2 DOF.
For the final time we right mouse click on Fixtures,
choose Fixed Geometry.
Again, we manipulate the view to get the best shot
so Spacebar, standard view,
and now I'm looking for that vertex,
just on the free edge there.
That gives me a good shot of that.
Pick that vertex, again, and we'll need to use Advanced.
We select our Front Plane,
and now we've only got one degree of freedom to choose,
and that's the first box that's the degree of freedom in X.
Again, just confirming it's Along the Plane in Direction 1,
which is our X direction.
We check OK.
Again, we hover over, we see X = 0 is confirmed there.
Let's just click in here and rename it as 1 DOF,
and now we have the complete set 3-2-1, the 3-2-1 method.
Again, just to review, hit Spacebar, come back to standard.
We've applied a constraints 3-2-1 degrees of freedom,
respectively.
Now we want to apply the axial loading
at the big end and the little end.
Right mouse click on External Loads and choose Bearing,
and we'll start at the big end.
We want to apply the load
to the right hand side of the big end.
Click on that surface.
The coordinate system we need we prepared earlier,
so we can select the big end coordinate system.
Just confirm the units are in English IPS.
We want to apply 20,000, that'll be 20,000 pounds force.
I usually like to click away
just to make sure that's been picked up properly.
It's also reverse the direction,
so again, just useful to check that.
It doesn't do any harm just to check through
a couple of times, just flick it backwards and forwards
till it settles down to the direction we want.
If we go to the big end view,
just confirm, that's looking good.
It's 20,000 applied in a Sinusoidal distribution
we'll see in a tensile type loading direction.
That's set up OK, check OK.
If we open up External Loads,
we can see we've got the Bearing Loads there.
We can see it's confirming it's 20,000 pounds.
Let's click in there and change that to big end.
Let's prepare ourselves, let's go to the little end,
pick the view, go to little end view,
and we're going to do a similar job here,
so right mouse click,
again, it's going to be a bearing load.
We pick this end here, again, think of a tensile sense,
we're going to be pulling the little end.
The local coordinate system's going to be
the one we set up especially for that little end.
Again, it's going to be 20,000 pounds.
Let's click away, see what it does.
Again, if we just click Reverse, Reverse,
it's the Reverse direction we want there, so that looks OK.
Again, confirm it's the Sinusoidal distribution.
That's the default, that's the engineering assumption
that we often make for bearing type loads
when we're applying them in this manner.
We check OK.
Then the last job is to rename this as little end.
Again, it's just confirming it's got 20,000 pounds,
actually, in the negative sense, negative X direction.
+20,000 pound the big end,
- 20,000 at the little end, that's looking good.
At this point, let's save off our model,
so File > Save As, and we'll save it as advanced_model_12.
In conclusion in this video,
we saw how to set up the three individual constraints
required for the 3-2-1 method,
and we also applied the balance load set,
bearing load at the big end,
and bearing load at the little end.