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COE Ask The Expert

Welcome to the COE Ask the Expert Webinar

Presented by Jeff Roark

Our next Ask the Expert will be August 29th at 10:00 am CentralPresented by Ed Ladzinski

Visit http://www.coe.org/events/experts.cfm for event details!

http://www.coe.org/events/experts.cfmhttp://www.coe.org/events/experts.cfm

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KBE Tips and Tricks

Speakers:

Jeff Roark

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KBE Topics

KWA Rules, Reactions and Checks

Topology Control in Power Copies

Knowledge Pattern

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Design of a simple rib

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What is there to consider?

Function

Structural

Aesthetic

Manufacturing

Quality

Time

Assembly

Material ABS Polypro Nylon

Every design consideration is complex

Constraints:

Draft

Function

Material

Thickness

Texture

Function

Thickness Base Material Rib Thickness Material Selection

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Basic Rib Design Rules

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Basic Rib Design Rules

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Basic Rib Design Rules

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How can all these rules be captured?

KWA:

Rules

If Then conditions

Unchanging facts or conditions

Reactions

Dynamically overload values

Multiple rules can modify a parameter

For While looping

Checks

Testing the state of a parameter for

True or False

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Parameters

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Rib To Wall Reaction

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Rib Height Reaction

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Top Of Length Reaction

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Rib To Wall Rule

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How it works

Modify Parameters

Checks are evaluated

The Rule Overloads

Rib_To_Wall_Max

Reactions evaluate

If they need to fire or not

Checks are evaluated

The Part Updates

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Resolving Rules/Reactions

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Rib Height Reaction Fired

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Top Of Rib Reaction Fired

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Rib To Wall Reaction Fired

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Top Of Rib Reaction Re-fires

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Before

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After

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Comparison

Before After

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Topology Control in PowerCopies

David Burke

Johnson Controls Inc.

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Overview

Background of Topology

Problem/Solution Scenario

Example #1

Example #2 Advantages/Disadvantages

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Topology Control in PowerCopies

What is topology? A boolean that describes the orientation of an object. Could be known as positive/negative, true/false,

up/down, etc.

Why is it important? Topology of objects help control many actions in

CATIA. The default direction of a split, offset plane,start/end of a line, etc. are all determined by the topologyof their reference object.

PowerCopies rely on topology to be defined on the flyfrom a user since all of their reference objects are beingreplaced upon instantiation.

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Problem:

Users trying to instantiate PowerCopies accidentally usethe wrong orientation (flipping of arrows) which causesthe PowerCopy to fail or the result is undesirable.

Arrows Dont MatchResult is undesirable

or part fails

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Solution:

Use Knowledge Advisor (KWA) to test fororientation and control it so a desirable result isachieved every time.

Arrows Dont Match

Intended result is

still achieved.

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Example #1

Using a measure to test a planes orientation A PowerCopy with a plane and a point for inputs

The arrow always needs to point towards the point input

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How Does it Work?

A KWA rule controls the topologyDeclare some variables to be used later. Create the test plane to measure

off of and control its direction

with a boolean.

Make two measures to be compared.

Evaluate the measures and decide if the

reference should be set to the original plane

the user selected or an inverse of that plane.

All of the geometry in the PowerCopy should reference the plane

created as a formula instead of the plane selected by the user. This

way the reference plane is swapped to the correct orientation by the

rule before any geometry can fail.

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How Does it Work? Now the user can select either orientation and the

PowerCopy will still work as intended.

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Example #2 Another strategy to test a surfaces orientation

A PowerCopy with three planes and a surface for inputs.

The surface will trim the part, and the side with the leastamount of material must be removed.

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How Does it Work? First some geometry is created to measure from

A line that is as long as the entire part

without the trim is created.

The aforementioned line is trimmed

with the input surface.

These lines will be evaluated later in the

KWA rule

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How Does it Work? The lines are evaluated in a KWA rule.

Measurement variables declared in the rule.

Set one distance to the entire length and

the other to the length of the split line.

If the NormalDist is lessthan the MeasuredDist,

the split must be OK

since the larger amount

of material is left over.

Otherwise the split must

be flipped by swappingsurfaces because the

smaller amount of

material would be left

over.The geometry is swapped

by the rule just as in the

first example.

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How Does it Work? Now no matter what the user sets for the orientation of the

surface, the larger part of the material will be left over.

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Some Advantages and Disadvantages

Advantages: Users can use PowerCopies much easier

The intended result is generated every time

The PowerCopy is more robust

The creator of the PowerCopy can make moreassumptions about the result since it will be the sameevery time

There are many ways to test for topology, only a coupleare shown here

i.e. center of gravity, volume, area, etc

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Some Advantages and Disadvantages

Disadvantages: It is difficult to come up with a solution for each

PowerCopy, since each solution will be different

Extra geometry needs to be created, which could be aproblem with large and/or complicated surfaces.

Note that instead of swapping the surface, one could activateand deactivate two splits that split in the opposite direction

There needs to be an input that acts as a reference(something to measure off of perhaps)

It can become confusing to try to control more than oneinput since one input switching could affect another

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Knowledge Pattern

Anthony Pulcini

Johnson Controls Inc.

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Contents

What is Knowledge pattern Advantages

Where is knowledge pattern

Knowledge pattern interface

Example 1 Knowledge Language Notes

Example 2

Knowledge Language Notes

Capability Speaker Grill Example

Conclusion

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What is a Knowledge Pattern

Creates a pattern of datums (points, lines, planes) orudf templates in an associative way using theknowledgeware language.

Associative is key

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Advantages of using a Knowledge Pattern

Allows user to make a pattern of datums that arecontrolled by parameters.

Allows user to bring in the same template many times

with different results (instances). Allows user to bring in multiple templates in the same

pattern.

Automates UDF instantiation (no user interaction).

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Where is Knowledge Pattern

Located in Product Knowledge Template (PKT)workbench

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Knowledge Pattern Interface

Highlights Execution Mode

List Editor

Pattern

Definition Parameter

Dictionary

LanguageBrowser Panel

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Example 1

Parametersdrive numberof planes and

spacing inpattern

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Example 1

Add lists

For while loop

Set variable p

Name p

Tip: List will

automaticallypopulate uponexecution

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Knowledge Language Notes

CreateOrModifyDatum

Creates the planes and populates the list planeoffset

Offsets the plane a certain length (l)

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Example 2

Bring in aUDF usingthe planes

as inputs.

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Example 2

UDF inputsthat need to

be defined.

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Example 2

For while loop Finds UDF in

Catalog

Sets inputs

Names UDF

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Knowledge Language Notes

CreateOrModifyTemplate Finds UDF in a catalog and populates list

udf_cylinder.height_plane Sets first input of UDF to a plane in the list Planes2

Planes2.GetItem(i) Gets plane from list at index I

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Capability

Automatic execution upon any change affecting the pattern

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Capability

A simple if elsestatement canchange which

template isbrought in

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Speaker Grill Example

Design requirements Holes need to be in

die draw

Two types of holes:through holes andblind holes

Speaker grill isnormally not perfectcircle

Each hole is uniquebased on the surface

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Speaker Grill Example

Due to design requirements a typical pattern cannotbe used

This process was automated by projecting points ontoa surface and using a knowledge pattern

The same process works for every speaker grill andspacing can be modified quickly

Before automation designers would have to manuallyuse the draft command more than 1000 times in some

cases Automation reduced design time from 40hrs to 3hrs

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Conclusion Knowledge Pattern

Can bring in the same UDF with different instancesthat depend on the inputs the creator sets.

Can bring in totally different UDFs that may require

different inputs. Parameters can modify which UDF comes in, and the

inputs of the UDF, which allows the ability to makequick and easy modifications.