CADFamily.com

11/15/2011

Post-processing Brake System Analysis

In this chapter using HyperView

-HvTrans to translate ODB files to H3D files

-View multiple mode shapes simultaneously

Overview of HvTrans

HvTrans is an Altair tool that translates solver results files, such as ODB files, to H3D files. An H3D file is an Altair proprietary file containing model or results data or both.

HvTrans runs in GUI mode and batch mode. From HvTrans, you select the results you want extracted to an H3D file. You can also specify whether or not to include model information in the H3D file from the result file or corresponding input file. Because only some information is extracted, the H3D file is usually smaller than the solver output file. This is a benefit. When you want to work with a smaller results file, use HvTrans to create one.

H3D files can be read into HyperView and HyperView Player. HyperView Player

enables your organization to visualize 3D CAE models and results via the Internet. HyperView Player includes a web browser plug-in as well as a standalone executable for both PC and UNIX. It can be downloaded from Altair’s web site www.altair.com and used on Windows for free; no license is required. H3D files are useful when you want to focus in on certain information and share it with others.

H3D files can also be created from inside HyperMesh and from HyperMesh results translators using the –h3d option.

Although HyperView can directly read ODB files and the ODB file from the brake system analysis is only 3.3 MB, the next exercise demonstrates creating an H3D file from the ODB file using HvTrans.

On Windows, open HvTrans by clicking HvTrans in the start menu under Altair HyperWorks, Altair Tools. On UNIX, execute the altair/scripts/hvtrans script to open HvTrans. Below is an image of the HvTrans window and following are descriptions of some of the options and sections in it.

HvTrans window

Table 9.1: Options in HvTrans

Item no. in Figure 9.1

Option Name

Function

File menu

Select results file and config file. Exit HvTrans.

Select Subcase

In a results file with multiple simulations, select a simulation to convert to H3D. Multiple selections are allowed.

Compression Options

Compress the created H3D file

Browse…

Select the model file to include in the H3D file

All/None/Reverse

Select a set of results or components

Result Dimension

The dimensions available for the selected result(s)

Result Type

Select result types to be put in H3D file

Ply

Used with composite material results

Components

Components of selected results

Translate…

Select the results file name (*.h3d)

Include model with translated results

If no, create a H3D with only results (smaller)

Exercise 1: Create H3D file and load it in HyperView

Create an H3D file containing only the mode shapes for the frequency analysis *STEP. Do not extract the results for the contact analysis or dummy *STEPs to the H3D file. Then load the H3D file into HyperView.

Create H3D file

1. Open HvTrans from the Windows Start Menu.

2. From File, select Open Result File.

3. Select the ODB file BrakeDisc_Complete.odb.

Notice the Current subcase is CONTACT_STEP.

4. Click Subcase and unselect CONTACT_STEP and DUMMY_STEP. Leave MODAL_STEP selected.

5. Leave all the modes under Simulation selected.

6. Leave all other defaults in the HvTrans window set as they are.

7. Click Translate.

8. Specify a location and name for the H3D file you will create.

9. Click Save.

10. From File, select Exit.

The H3D file is created and it is approximately 374 KB.

http://www.cadfamily.com/html/Article/Post-processing%20Brake%20System%20Analysis_964_1.htm

Details of the front casing design with Alias

1.《Open File》: camera_L5.wire. 【L5_s0-1】

Step1:鏡頭 ( Lens )

1. Make the Lens crvs layer visible. 【L5_s1-1】

2.《Revolve》[ Revolution Axis: Y ] 【L5_s1-2】

3.《Intersect》【L5_s1-3】

4.《Trim》and make the Lens crvs layer invisible. 【L5_s1-4】

Step2: ( Flush )

1. Make the Flush crvs layer visible. 【L5_s2-1】

2.《Skin》【L5_s2-2】

3.《Round》【L5_s2-3】

4.《Intersect》flush boundary loop surfaces with front casing. 【L5_s2-4】

5.《Trim》【L5_s2-5】

6. Pick template lines and toggle them to pickable state. 【L5_s2-6】

7.《Draft》[ Direction: Y ; Depth: 1 ] 【L5_s2-7】

8. Make the Flush crvs layer invisible.

9.《Round》[ R0.5 ] 【L5_s2-9】

10.《Project》and《Trim》. 【L5_s2-10】

11.《Planar》【L5_s2-11】

(Step3: Battery cover )

1. Make the BatCov crvs layer visible.

2.《Project》【L5_s3-2】

3. Make the BatCov crvs layer invisible.

4.《Offset》CrvOnSrfs -0.5mm. 【L5_s3-4】

5.《Trim divide》【L5_s3-5】

6. Clear the remained CrvOnSrfs.

7. 《Offset》the slot and remove the orginal. 【L5_s3-7】

8.《Skin》[ Rebuild: On ] to construct slot walls. 【L5_s3-8】

http://www.cadfamily.com/html/Article/Details%20of%20the%20front%20casing%20design%20with%20Alias_970_1.htm

11/10/2011

Creating the Bottom Base in Cimatron

In Exercise 1 we received a basic introduction to Cimatron E and created a simple fitting. In this exercise we are going to create another part, and the aim is to get better acquainted with the Sketcher.

Steps to Follow:

1. Sketch the Initial Shape

2. Add Circles

3. Add Drill Holes and Extrude

4. Finishing (add rounds and ribs)

Step 1 - Sketch the Initial Shape

Open a new Part document, and assign it the name demo.

Enter the Sketcher and use the Symmetry tool to draw a vertical symmetry line at the origin.

Remember, the Symmetry tool is always activated with a geometry creation tool. Right now the default geometry creation tool is the Line tool, so when you finish creating the symmetry line you will be drawing symmetric lines.

Now use the Line tool to draw a line, starting from one side of the screen.

Remember: If you press Exit after drawing the symmetry line, the Symmetry tool will be turned off. To turn it on again, click the Symmetry tool and pick the symmetry line to re-activate it.

Now we need to draw an arc tangent to the line.

Select the Arc tool or select Arc from the popup menu.

The default geometry creation option is Pt (Point) - the end point of the arc we need to draw.

Keeping the symmetry option, draw the arc starting from either endpoint.

We are now going to draw a circle in the center, so turn off the Symmetry tool.

Using the default Center option, draw a circle as shown below. Use dynamic constraints to make sure the center lies on the Y axis, and for the next point (circumference) choose one of the arc endpoints.

Now use the Trim tool to trim the extra circle parts. Make sure you trim any arc segments that overlap the circle.

We are now ready to assign dimensions to the sketch. Remember there are two different ways of working with dimensions:

Automatic Preview: The sketch is updated with every dimension change. This is the default way of working.

Manual Preview: The sketch is not updated automatically, and changed dimensions appear with an underline. This way of working is convenient when you want to change many dimensions, then udpate all at once by clicking the Update button.

For the first dimension, use the default Automatic Preview method. Set the following length between the symmetry line and the arc center.

The sketch updates accordingly.

Note: You can move the display of the dimension by clicking and dragging the witness line. Clicking on a dimension itself allows you to change the value. Also, for a dimension between two points, you can drag the witness line so that it switches from vertical to horizontal:

Now switch to Manual Preview, and assign two radial dimensions. How?

Click on the arc, then click to locate the dimension.

Remember, dimension colors have the following meanings:

x Red indicates a geometric problem.

x Orange indicates an over-defined sketch.

x Pink indicates a fully dimensioned (fully constrained) sketch.

Click the Update icon to adjust the sketch.

The sketch is not yet fully defined, since there is still a degree of freedom in the Y direction. But for now we will consider the sketch finished.

http://www.cadfamily.com/html/Article/Creating%20the%20Bottom%20Base%20in%20Cimatron_953_1.htm

http://www.cadfamily.com/html/Article/Creating%20the%20Bottom%20Base%20in%20Cimatron_953_2.htm

http://www.cadfamily.com/html/Article/Creating%20the%20Bottom%20Base%20in%20Cimatron_953_3.htm

Finishing the Assembly in Cimatron

Steps to Follow:

1. The Handles

2. The Spout Connectors

3. The Spout

Files (*.dtf's) to receive:

1. handle

2. screw

3. handle_button

4. connector1

5. connector2

6. bot_cover

7. top_cover

8. filter

Step 1 - The Handles

The top base is still active, but we have finished creating it.

Make the entire assembly active by right-clicking on the assembly name and selecting Activate Assembly.

(You could also open the popup menu in the graphic area and select Activate Main Assembly, or click the icon.)

Show all components. The easiest way is to click the Show icon, then the Select All icon .

You will still see the sketches associated with the top base. To hide them you need to activate the top base component, hide the desired entities, and then re-activate the main assembly.

Now use the Add Component function to add two handle components.

The handle is to be connected to the sub_assembly component. First select the inner face of the handle.

Then select the upper face of the sub_assembly.

Connect using Coincident and Anti-Align.

To complete the connection, select the axis of the handle and one of the cylindrical faces of the sub assembly or water connector.

Connect using Concentric and Align. Repeat for the second handle.

Now add the screw component twice.

Connect the screws so that they sit inside the handles.

How to connect?

First, select the lower inner face of the handle and the lower face of the screw.

Connect using Coincident, Anti-Align.

Then select the axis of the screw and the axis of the handle.

Connect using Coincident, Align. (Or, instead of the handle axis you could select the cylinder of the water connector. In that case, use Concentric, Anti-Align.)

If connected properly, you can see the screws in top view.