Practice exercise

00:01

This is a practice exercise video solution.

00:07

For this practice, we will carry on with our data set from our previous practice or we want to upload the supply dataset conveyor drive simplified.

00:15

At this point, we need to inspect the materials and add our loads and constraints in order to properly analyze this design.

00:23

So we'll get started by inspecting our materials, noting that there are a lot of different bodies inside of this design.

00:30

Because the materials are going to be applied to mainly our bracket, we're going to cancel the materials and first go to our loads.

00:39

Inside of loads, we're going to use Point mass (auto).

00:43

Point mass auto will automatically toggle on gravity and that's fine,

00:47

and we want to make sure that we expand our model components and select the entire component for our motor.

00:53

Then the geometries will be the location where the mass will be applied.

00:58

For this we're going to be applying it to the inside diameter of the mounting bracket.

01:02

Because the mass is going to be what's called hub centric,

01:06

this means that the face of the motor is going to slide into the mounting bracket and it's going to help carry the load.

01:12

Next we want to take a look at the mass.

01:15

If we change the units to pounds, you'll note that this is 52.776 pounds.

01:22

Based on the specs of this motor, we know it's about 55 pounds which means that the automatic mass is relatively close,

01:28

but we're still going to modify this and then say Ok.

01:32

You'll note now that the bracket is left in the screen but the motor has been hidden.

01:37

If we go to our materials, we can see that we're only looking at a single component.

01:42

Now, we want to modify the material of our component and in this case we're going to go to an aluminum, we're going to use A356 T6 and say Ok.

01:52

We are going to use the home button to make sure that I'm fit to screen and now I want to apply some loads and constraints.

01:58

First, we'll select a fixed constraint.

02:01

We'll be using the section of the counter bore where the head of a bolt would be held to prevent motion in the Z direction.

02:08

Next, we'll apply another constraint and in this case we're going to be using a pin constraint on the inside locations,

02:15

where a bolt or shoulder would be holding the bracket.

02:18

This will be only in the radial direction and we'll select Ok.

02:23

Now that we have our constraints, let's take a look at our structural loads.

02:27

In this case, we have a motor that automatically has a mass applied to it.

02:31

So the mass is going to be loading up our bracket but there are also other aspects such as torque and rpm that we might want to consider.

02:40

If we were looking at just rpm this would be a global angular load,

02:44

but in our case we're going to be looking at our structural loads and for our example, we're going to be using a remote moment.

02:51

We need to select our targets and in this case, the moment will be applied to the bolts.

02:56

Once we begin selecting multiple bolt locations, you'll note that the moment itself is being applied in the center of our selection,

03:05

you'll notice that it's going back to two faces.

03:08

If we have any problems with the selection, it's a good idea to make sure that you zoom in and select the appropriate faces.

03:15

If we grab our targets, you can see that we are missing the lower two.

03:19

And once we select those, we have our target moment in the center of our bracket.

03:25

If we need to reposition this at all, we can slide it inside or out.

03:29

But because we are dealing with an electric motor, I'm going to leave it here centered between these four bolts.

03:34

I am going to change my units because the torque that I have from this specific design, it's in the inch, pound or in this case pound force per inch.

03:45

We're going to modify this value to be 335.

03:49

And we'll say Ok.

03:51

Now our design has all the information required for us to solve but there is still a warning.

03:56

It's telling us that the degrees of freedom are partially unconstrained.

04:01

You will note that there's a warning telling us that we have 34 fully unconstrained groups,

04:05

and that's because the bodies are hidden for the motor but they are still in the design.

04:10

Because no loads or constraints are applied to them we really don't have to worry about that,

04:14

but it is always a good idea to take a look at the degrees of freedom.

04:18

In our case, you'll notice that the degrees of freedom are not really showing us anything,

04:22

and that's because we have our inspect and component color cycling toggled on.

04:28

The component color cycling will automatically override what we're seeing here in the degrees of freedom,

04:33

so it's a good thing to turn it off to make sure that we do analyze if things are fixed, potentially partially or free.

04:41

At this point, everything is ready to solve but let's make sure that we do save before moving on.