WORKSHOP 12 BUILDING A WHEEL TEMPLATE

1. WORKSHOP 12 BUILDING A WHEEL TEMPLATE

3. Building a Wheel Template • In this workshop, you create a wheel template that sets up the interface to your tire model.

4. Building a Wheel Template • Creating a template To create the wheel template: • From the File menu, select New. • Name the template wheel. • Set Major Role to wheel. • Select OK.

5. Building a Wheel Template • Creating communicators To create communicators: • Create two left/right input communicators for toe and camber angles. They should be of type parameter real and be named toe_angle and camber_angle. • Create a left/right input location communicator, named wheel_center, that receives the wheel center location. This communicator positions the wheel at the location dictated by the suspension. The corresponding output communicator, wheel_center, resides in the MacPherson suspension you created in Workshop 9—Template-Builder Tutorial in Adams Online help. Tip: Enter an initial value for the wheel center, or else the default value will be 0,0,0, and the wheel centers will be located on top of each other. You will see the result of this in the next steps. Remember that the negative y-direction is left.

6. Building a Wheel Template • Creating construction frames and mount parts To create the construction frame and mount part: • Create a left/right construction frame, named wheel_center, to be used as the spin axis. Locate this construction frame on the wheel_center input communicator, which should match the output communicator from the suspension. This construction frame should also be dependent on two communicators for toe and camber angles. (See the different orientation dependency options.) Verify that the spin axis is defined correctly, such that the z-axis points out from the vehicle (this should be done automatically for you). • For the wheel, create the mount part that will attach to the suspension, and name the mount part, wheel_to_susp. The coordinate reference should be the wheel center construction frame.

7. Building a Wheel Template • Creating the wheel part • To create the wheel part: • From the Build menu, point to Wheel, and then select New. • Create the wheel part with the following data: • Name: wheel • Mass: 20.0 (kg) • Ixx Iyy: 5E4 (kg-mm**2) • Izz: 1E4 (kg-mm**2) • Property File: mdi_tire01.tir • Coordinate Reference: cfl_wheel_center • Location: 0, 0, 0 mm • Construction Frame: cfl_wheel_center • Orientation: 0, 0, 0 (deg) • Select OK to create the wheel part. Note: Adams/Car automatically creates a pair and sets the tire geometry in the property file.

8. Building a Wheel Template • Viewing tire geometry To view the tire geometry: • To view the tire property file, open the Modify Wheel dialog box and select the View File tool. • Search for the data block named DIMENSION. The parameters in this data block specify the size of the tire geometry. • Connecting mount and wheel parts To connect the mount part to the wheel part: • Create a fixed joint between the wheel and the mount part located at the cfl_wheel_center.

9. Building a Wheel Template • Modifying communicators • You’ll now modify a mount output communicator in the MacPherson template to be able to assemble these two templates as subsystems. • To modify a communicator: • Open the MacPherson template you created in Workshop 9—Template-Builder Tutorial in Adams Online help (be sure to use the one you created rather than the one in the shared database, because these have topological differences). • From the Build menu, point to Communicator, point to Output, and then select Modify. • Modify co[l,r]_suspension_mount to include the matching name wheel_to_susp. This allows the MacPherson template to pass on information to the wheel template about the part to which the wheels should attach.

10. Building a Wheel Template • Testing communicators To test communicators: • Test the communicators and select this wheel template and the suspension template you intend to use (make sure that you have these templates open in your session). Note that this template has been developed to be used with the MacPherson suspension template you created in Workshop 9—Template-Builder in Adams Online help. If you use this template with another suspension, there might be other communicators you must match.

11. Building a Wheel Template • Testing assemblies To check communicators: • Save the templates for the generic assembly. • Switch to Standard Interface, and create subsystems for your templates. • Save the subsystems you created in the previous step. • Create the generic assembly (for testing only, since you're not including a test rig): • Tools Command Navigator acar files assembly new generic • assembly class: generic • subsystems: wheel and macpherson • Investigate the assembly to confirm that the subsystems assembled correctly.

12. Building a Wheel Template • Note: The tire template you just created contains the minimal entities to run with Adams/Car and Adams/Tire. Use the tire template (_handling_tire.tpl) in the shared Adams/Car database if you want to use all the features of Adams/Car (for example, quasi-static setup), unless you require a special template. Some of the other entities set up in the _handling_tire.tpl model are: • A pair of DIFFs, one for each tire. Static-setup analyses use the DIFFs to determine the initial longitudinal slip of the tires. The tire UDE parameters reference the DIFF. • A pair of JPRIMs (jo[lr]per_sse_jprim) to lock the wheel during the static-setup analysis. These are perpendicular JPRIMs between the wheel part and ground (road). Tire UDEs reference these JPRIMs. • Output communicators co[lr]_tire_force to output the left and right tire force Adams_ids to powertrain templates for wheel omega calculations.