Jan 19, 2009 - CATIA Training. COPYRIGHT ... The aim is to adapt a strap on a pre-existing assembly containing 3 wheels and a wheel adjuster. The strap ...
Version 5 Release 19 January 2009 EDU-CAT-EN-PEO-FS-V5R19
Product Engineering Optimizer
Detailed Steps
Table of Contents Master Exercise: Strap tension optimization ....................................................................................... 3 Step (1): Define and run the optimization........................................................................................... 4 Step (2): Analyze the results .............................................................................................................. 8 Step (3): Create a strap PowerCopy ................................................................................................ 10 Step (4): Instantiate the Strap PowerCopy into an assembly........................................................... 14 Step (4): Instantiate the Strap PowerCopy into an assembly........................................................... 20
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Product Engineering Optimizer
Detailed Steps
Master Exercise: Strap tension optimization In this exercise you will optimize the tension in a strap and save results of the optimization iterations. You will then include this optimization feature in a PowerCopy for a later reuse in any gear assembly. This is the summary of the optimization problem. Givens: The aim is to adapt a strap on a pre-existing assembly containing 3 wheels and a wheel adjuster. The strap has to be chosen from predefined lengths. The position of the wheel adjuster will allow to get a specific tension in the strap. Goal: Optimize the tension in the strap to a target value by modifying the position of the wheel adjuster.
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Product Engineering Optimizer
Detailed Steps
Step (1): Define and run the optimization 1.1 - Define the optimization in Problem tab. • • • •
Open \…\Data\Start\Strap.CATPart document located in Student\Data\Strap directory. Go to PEO workbench. Click the Optimize icon. The Optimization editor panel displays. Go to Problem tab. Select in the Optimized parameter field the parameter TENSION using the button Select.
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Select in the Optimization type Target value type of optimisation. Click in the Target value field and enter with 1000N. Click Edit list button in the Free parameters field. The Choose the free parameters for the optimisation algorithm panel appears. Select x_adjuster in the Parameters window then click the arrow to put the parameter in the Free Parameters for Optimisation window as shown on the picture below. Click OK.
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x_adjuster appears in the Free parameters field of the Optimization panel. Select it then click Edit ranges and step button. Specify 1mm as the Inferior Range, 200mm as the Superior Range and 0.5mm as the Step for x_adjuster. Click OK.
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Product Engineering Optimizer
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Detailed Steps
Click Edit list button in the Free parameters field. The Choose the free parameters for the optimisation algorithm panel appears. Select y_adjuster in the Parameters window then click the arrow to put the parameter in the Free Parameters for Optimisation window. Click OK. y_adjuster appears in the Free parameters field of the Optimization panel. Select it then click Edit ranges and step button. Specify 140mm as the Inferior Range, 280mm as the Superior Range and 0.5mm as the Step for y_adjuster. Click OK. The Free Parameters field looks now like on the picture below.
Switch on Constraints tab to define constraints, Define the first constraint named ”No sag”. This constraint ensures that there is no sag in the Strap, so that the strap winds around the wheels. Click New button in order to display Optimization Constraints Editor panel. In this panel, type TENSION > 0N using the Dictionary of parameters and functions as shown on the picture below.
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Product Engineering Optimizer
Detailed Steps
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Click OK. Select this constraint in the list of constraints of the Constraints tab. In the Name field, type No sag instead of the default name Constraint.1. In the Weight field, type 20.
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Define the second constraint named ” Adjuster”. This constraint ensures that the adjuster wheel centre stays inside a circle with the centre point having coordinates (80mm,200mm) and the radius of 60mm. Click New button in order to display Optimization Constraints Editor panel. In this panel, type (x_adjuster-80mm)**2+(y_adjuster-200mm)**2 - 60mm2
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