Generating a simulation mesh

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En provenance du cours de Autodesk

Engineering Design Process with Autodesk Fusion 360

45 notes

Autodesk

Engineering Design Process with Autodesk Fusion 360

45 notes

Cours 4 sur 5 dans Specialization CAD and Digital Manufacturing

This course provides a deeper exploration of mechanical assemblies and simulation, which are key engineering features of the design and manufacturing process. The foundation of engineering design is exploration and iteration. Design is rarely a perfectly linear and straightforward process. In this course, we'll explore mechanical assembly design and simulation, focusing on testing and improving design components and performance. As we move through design assumptions, testing, and refining design ideas, we'll come closer to a final design, while developing a deeper knowledge in Autodesk® Fusion 360™ for simulating and analyzing product functionality. After completing this course, you will be able to: • Describe the engineering design process and workflow in Fusion 360. • Summarize the trends that are influencing the design industry. • Demonstrate knowledge and skills in more advanced Fusion 360 CAD and simulation skills

À partir de la leçon

Design Validation

Even with today's rapid manufacturing processes, there is still a cost associated. Regardless if you have access to a 3D printer, making informed design decisions is critical to the success of any product. In this week's lessons, we'll explore static simulation to identify weak areas of our design so they can be addressed before production.

Creating a static simulation study5:55

Adding simulation constraints and loads7:36

Generating a simulation mesh5:53

View simulation results9:36

Refine a mesh simulation7:20

Rencontrer les enseignants

Autodesk Education

In this lesson, we'll generate a mesh for simulation.

After completing this lesson,

you'll be able to generate a mesh and use press/pull.

Carry on with a file from our previous example.

The next step is going to be generate our mesh.

Now, if you use the solve option, by default,

it will automatically go through and generate a mesh based on the default settings.

And that's okay, but in this case,

I want to generate the mesh and make sure that it's

fine enough in the areas that we want to focus on.

This will also help present any problems that may arise.

So, from our browser under Mesh,

we're going to right-click,

and click generate mesh.

Notice that we get an error,

and this does happen from time to time,

and in this case says, "Meshing error!

Phase: Solid meshing Description: No further information."

It doesn't really help us out unfortunately,

but luckily, I know where the problem lies.

Anytime you create geometry,

you want to make sure that it perfectly aligns with

the surrounding cell bodies or ideally has a slight bit of overlap,

that we know that there's no small gaps in between edges or faces.

Now in our case, I know that the issue lies when we added the small segments and here,

they were adding additional structure.

Now, if you remember, we created one using the exact inside profile this opening,

we extruded it up,

we patterned it, and then we combined all four of them.

Now, there are certain areas where it

perfectly aligns but I'm going to guess that in these corners,

these filleted corners, that we're likely going to have an issue,

and sometimes, you can find this by hovering over these edges,

and you'll notice how this arc on top is one single edge,

but on the bottom, we actually have four smaller segments.

Now, this doesn't instantly dictate that we have a problem here,

and there are other ways that we can go about finding it.

For instance, going into the simplify, workspace,

and starting to delete some entities,

but you'll notice again that hovering over this shows me that I

have three edges here where this upper edge has four,

and if you look in the smaller recesses where we did our extrude cut,

the arc on the top and the bottom match in

terms of the number of entities that make up that.

And that's true, for any of these edges that you go around to.

And there are some cases like this where we have

a sharp corner that we could come back in,

we can address that but again,

the bottom, the top have the same number.

So in order to fix this,

I'm going to go back to the model workspace.

It's something that we could adjust inside of

the simplify workspace and simulation but

we want to make sure that it applies to the model itself.

We're going to select XSTAR,

we're going to expand it, and I'm going to come in,

and I want to click on this face,

and I want to take a look in the timeline to figure out where that feature is.

So we have the combine,

we have the mirror,

and we have this source mirror,

and then we have this extrude.

So, I'm going to right-click and I want to roll the history marker here.

So, when we're at this extrude,

rather than going back and adjusting the original sketch or making any changes to that,

what I'm actually going to do is come into the bodies folder,

I'm going to hide my body bottom surface as well as the XSTAR body,

and I'm simply going to use the modify, press/pull command.

So, this is going to allow me to grab all of these external faces,

and we're going to use this selection,

and we're going to extend them out a small amount.

Now, the rid that they intersect with is two millimeters thick,

but I'm only going to add 0.5 millimeters,

it's going to extend that out by drag the marker just past it.

It'll still mirror this because it's the same body.

I mirror those across.

I show the XSTAR body.

We'll allow those to combine.

And again, once they're combined,

they take on the nylon six material in appearance.

So now, we're going to take the history marker.

I'm going to drag it down the timeline and go all the way to the end.

Because our timeline extends past this end,

what I'm going to do is I'm going to make sure that I scroll as far as I can go,

and I'm going to take the history marker,

and drag it pretty far down the line.

Now, in some cases, you might be able to just

go ahead and drag that marker all the way to the end.

In some cases, you might want a step forward a couple of features at a time.

It really depends on the geometry that you're editing,

and whether or not, other things are going to rely on that.

Now in our case, we can drag it all the way to the end.

We can update all the graphics.

And in this case, I want to actually go ahead,

and save the file after these changes before I go back in,

and going to make changes to our simulation.

So, let's save the file,

and then navigate back to our simulation workspace.

So again, we still have the warning on the mesh.

We're going to right-click on mesh and we're going to regenerate it.

Once the mesh generation is complete,

you can view it on the screen on your model.

If it doesn't instantly show,

you can turn on the light bulb icon or right-click and toggle mesh visibility.

You see that we have mesh on the component tray,

as well as a mesh on the airframe itself, and if we zoom in,

you can see that the mesh element sizes are reduced in this area,

so we can analyze the small generative mesh shape that we created.

Everything looks pretty good here.

We might want to come back and make some refinements later.

But for right now,

I want to go ahead and save my file,

so we can move on to our next step.

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