CATIA运动仿真教程.pdf
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1、Crankslider Mechanism Tutorial Problem Statement The purpose of this exercise is to use the IntelliMotion Builder to demonstrate the procedure for configuring the mechanism and to then check for interference. The mechanism comprises of a crank connected via link1 and a universal joint (cardan compon
2、ent) to the Arm component to provide an oscillatory motion. This in turn is connected via another link to a collar that slides back and forth on a shaft. Link2 Collar Crank Arm Link1 Cardan Step 1 Open Model & Set Workbench You will need to run the DDMV5R7 or DDMV5R8 profile shortcut to enable the D
3、ynamic Designer Workbench. Open the product file crankslider_tutorial.CATProduct located in the crankslider sub-folder in the tutorials directory of the installation. If your workbench is not already set to Dynamic Designer (look at the Workbench icon at the top right hand side of the toolbar), then
4、 activate the Dynamic Designer Workbench under START DIGITAL_MOCKUP DYNAMIC DESIGNER. The Dynamic Designer commands can be accessed via the toolbar icons or the pull down menu (see below) Step 2 Create Mechanism from Assembly To auto create the mechanism from the assembly, click on the Convert Mecha
5、nism Icon . This will bring up a dialog box asking if you want to convert the assembly constraints when the mechanism is created. Make sure this option is selected before proceeding. The Screen should now look like that below where there are motion entity icons on the graphics screen. Expand the tre
6、eview to show the APPLICATIONS DYNAMIC DESIGNER branches. You should see the following mechanism data: Note that the assembly constraints have been mapped to Dynamic Designer joints and that the grounded parts in the assembly have been automatically made grounded in Dynamic Designer. Step 2 Default
7、Simulation Settings The Dynamic Designer Settings can be accessed from two locations. Global settings can be found in the Catia OPTIONS dialog (TOOLS OPTIONS menu selection) These setting are applied to future mechanisms in different assemblies. We will not be changing these for this exercise, but t
8、his is useful to be aware of. Model specific settings can be found by expanding the APPLICATIONS BRANCH of the Catia Treeview, and under the Dynamic Designer Branch, right clicking on the MOTION MODEL branch and selecting the PROPERTIES option. This option can only be done once a mechanism has been
9、started (i.e. a moving or ground part exist). You can also access mechanism settings from the MOTION MECHANISM settings. We need to change the direction of gravity to match the orientation the model was built in. In this case gravity must act in the X axis direction. To change this, click on the dir
10、ection pull down list and select the Standard X option. STEP 3 Define Motion The complete mechanism is not designed to operate under gravity, so we need to provide input motion representing a motor connected to the system. Because the joints define how the parts move with respect to one another, we
11、apply motion to the joints as it is clear in which directions the parts can move. To drive the crankslider, we are going to put a motion on the cylindrical joint connecting the Crank to the Crank Housing. In the image shown below, this is joint 4. Please expand the branch under the joint to verify t
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