WORKSHOP 12 SUSPENSION SYSTEM II

Workshop Objective Software Version Files Required In this workshop, you use the model you built in (Workshop 11 - Suspension System I) to inspect the toe angle that the wheel exhibits throughout its vertical travel of 80 mm in jounce and rebound. Software Version Adams 2013 Files Required Use file suspension.cmd. (command file from previous workshop) Imported from exercise_dir/mod_11_suspension_1.

Problem description Use the diagram below for placements of parts. Be sure to point out that the model does not contain the spindle geometry. They will add the geometry at the end of the workshop.

Suggested Steps Open the model and simulate. Create a point-to-point measure. Use a Function Measure to Create a Toe Angle. Plot graph. Import CAD-based geometry. Turn off spindle geometry. Save your model. Perform optional tasks.

Step 1. Import Model and Simulate To import a model: Select Existing Model and start Adams/View from the directory exercise_dir/mod_12_suspension_2. From the directory exercise_dir/mod_11_suspension_1, search and opens the model that you created in the previous workshop. If you need a fresh copy of the model, open the command file, suspension_1_completed.cmd, from the directory exercise_dir/mod_11_suspension_1/ completed. Simulate the model to verify the motion.

Step 2. Create Point-to-Point Measure To create measures: Create a point-to-point measure, named .suspension.Wheel_Height, for the relative wheel displacement in the YG direction: To Point: Spindle_Wheel.Center From Point: ground.WH_ref Tip: From the ribbon Design Exploration, select Create a Point to Point measure. Run a one-second, 50-step simulation. Adams/View displays the relative wheel displacement as shown. a b

Step 3. Use a Function Measure to Create a Toe Angle Using an Adams/Solver function measure, create a toe angle measure using the markers Spindle_Wheel.Center and Spindle_Wheel.TA_ref (see Figure on slide 10) Tip: From the ribbon Design Exploration, select Create a New Function Measure. Fill in the Function Builder as shown. Before selecting OK, select Verify to check the syntax of your function. Note: You must run a simulation after creating the function to view its plot. Hint: To get help while working in the Function Builder, press F1 a b

Markers for Toe Angle Measure

Step 4. Plot Graphs f e b a c d In Adams/PostProcessor, plot toe angle versus wheel height. Set Source to Measures. Set Independent Axis to Data. Select Wheel Height. Select OK. From the Measure list, select Toe_Angle. Select Add Curves. Return to Adams/View. c d

Step 5. Import CAD-Based Geometry Now, you’ll import more realistic, CAD-based spindle/wheel geometry, as shown next. Knuckle Wheel

Step 5. Import CAD-based geometry (Cont.) The two geometry files that make up the spindle/wheel are: wheel.slp knuckle.slp They are render files, which have an extension of .slp. They were created in Pro/ENGINEER. By default, when you import the files, Adams/View names the geometry based on the Pro/ENGINEER assembly from which they came and not based on their file names. In this case, the CAD geometry came from a model named suspensn. Therefore, Adams/View names the geometry suspensn and suspensn_2. When you export your model, Adams/View exports one .cmd file (suspension.cmd) and one .shl file for each CAD geometry (suspensn.shl and suspensn_2.shl).

Step 5. Import CAD-based geometry (Cont.) To import the geometry: Import the geometry files located in exercise_dir/mod_12_suspension_2/suspension_cad: From the File menu, select Import. Set File Type to Render. Browse File To Read and select wheel.slp and knuckle.slp Attach the geometry to the part named Spindle_Wheel. Import one file, select Apply, and then import the other.

Step 6. Turn off Spindle Geometry a Turn off the appearance of Adams/View spindle geometry so that only the CAD geometry is visible: From the Edit menu, select Appearance. Highlight the following at the right. Select OK. Change the Visibility setting to Off. b d e c

Step 7. Save Your Model To save your work: Save your model as suspension_parts.cmd. If you want to further explore the model, as suggested in the next section, leave the model open. Otherwise, proceed with the next step. Exit Adams/View.

Step 8. Optional Tasks Replace other Adams/View geometry with CAD geometry: From the directory exercise_dir/mod_12_suspension/suspension_cad/more_susp_cad, open the rest of the CAD-based suspension component geometry. Tips: Remember to associate each CAD geometry with the appropriate part in the Adams/View model. Not all the CAD geometry is associated with the Spindle_Wheel part. These geometry files are called render files, which have an extension of .slp. There is one file for each Adams/View part. Turn off the appearance of Adams/View geometry so that only the CAD geometry is visible.

Step 8. Optional Tasks (Cont) Import a parasolid file into Adams/View Start a New Model in Adams/View from the directory exercise_dir/mod_12_suspension_2. Create a model named parasolid, with Gravity set to Earth Normal (-Global Y), and Units set to MMKS - mm, Kg, N, s, deg. Import the parasolid file From the File menu, select Import. Set File Type to Parasolid. Import the file crankshaft.xmt_txt from exercise_dir/mod_12_suspension_2/completed. Enter .parasolid for the model name and hit OK. Note: You can store the geometry under a model or part name Note: This file can also be found under $install_dir/durability/examples/engine sub-folder

Step 8. Optional Tasks (Cont) Assign mass to the imported parasolid Right-click the piston part and select Modify. Use the pull-down menu to change the ‘Define Mass By’ option from User Input to Geometry and Material Type. Right-click the Material Type and select the steel material. Hit OK. You will now see a center of mass ‘piston.cm’ has been created and mass and inertia properties have been assigned to the piston part. Add geometry to the existing part From Settings > Working Grid select the location to be the center of mass of the piston part. Click on the Link tool and choose the option of ‘Add to Part.’ Specify length = 20.0 cm, width = 4.0 cm and depth = 2.0 cm. Select the piston part. Select .piston.cm as one of the ends and drag to the other end. Note that the position of the center of mass of the part is now based on the new geometry that consists of the parasolid and the link geometry. Also note that the mass and inertia is calculated based on the new geometry.

Workshop 12, Review Is there any difference between a point-to-point measure and a function measure using a displacement function (for example, DX(I, J, R))? ________________________________________________________________________________________________________ Where does a CAD file fall in the model hierarchy? What is the CAD file a child of? ________________________________________________________________________________________________________