1、WORKSHOP 8 Using the Tire Testrig,Tire Testrig,In this workshop, you will learn how to use the new Tire Testrig available in Adams/Car. The testrig provides the ability to visualize the effects of tire properties and compare tire model performance. The testrig provides the capability to easily produ

2、ce plots of tire characteristics using a tire property file and a list of inputs.,Tire Testrig,Problem Statement: The tire testrig model consists of single tire (wheel) mounted on a spindle that can be suspended to ground by a spring, or preloaded by a single component force or fixed at a certain ax

3、le height. The road can be fixed or moving (moving in x, y, z-direction, or rotating around x-axis), while the road itself can be flat with or without a cleat (pothole), or user-defined (road property file). The wheel movements can enhance steering (slip angle variations), wheel rotations (longitudi

4、nal slip variations), inclination with the road (camber), vertical and longitudinal wheel (center) displacements.,Tire Testrig,The procedures to use Tire Testrig: This Workshop is split into two parts. One where the default loadcase file is being used and one where you creates your own loadcase file

5、. Using the shared tire loadcase file Run a Loadcase file with the tire testrig Reviewing the results in ADAMS/Postprocessor Creating a tire loadcase file Creating a Tire Loadcase file Reviewing the results in ADAMS/Postprocessor,Tire Testrig,Using the shared tire loadcase file: In this section you

6、will see how to use and modify the existing tire loadcase file. The default loadcase file (combined_slip_test.xml) has been provided in the loadcase.tbl under acar_shared_database. This loadcase has four analyses which define four experiments for the tire testrig. The tire characteristics at differe

7、nt slip angles are measured. A longitudinal slip sweep is carried out at each of the slip angles of interest (0, 2, 5, and 10 degrees).,Tire Testrig,Run a Loadcase file with the tire testrig: Open ADAMS/Car session. Click Simulate - Component Analysis - Tire Testing The Tire Testrig screen will appe

8、ar,Tire Testrig,Run a Loadcase file with the tire testrig (cont): Click File-Open and select the combined_slip_test.xml from the shared database The Tire Testrig screen shows the four analyses defined in the combined_slip_test.xml for the tire. Click Run It. After submitting the job a dialog box pop

9、s up indicating the Tire Testrig plots are available.,Tire Testrig,Reviewing the results in ADAMS/Postprocessor: The ADAMS/Postprocessor is automatically displayed in plotting mode once the analysis is complete. In the tree view on the left highlight each page to display the plots of various tire cu

10、rves.,Tire Testrig,Creating a tire loadcase file: You will create a new tire loadcase file. Here, you will compare two Fiala tire property files with different CSLIP parameter. Note: The mdi_fiala02.tir required in this workshop is provided in your acar_training_MD.cdb database. Open ADAMS/Car sessi

11、on Click Simulate - Component Analysis - Tire Testing Click File - New. Enter name in the New File window as New_Loadcase_Fiala. Click OK,Tire Testrig,Creating a tire loadcase file (cont): You will be prompted with following window. Click OK,Tire Testrig,Creating a tire loadcase file (cont): Select

12、“mdi_fiala01.tir” provided in acar_shared_database. Click Kinematics tab. In the Tire Radius field click Load from file to use the radius in the tire property file. Change Wheel Spin Motion to have Long_slip_sweep and the Amplitude to be 100 as shown in the figure below. Click the Out of Plane tab a

13、nd set the slip and inclination angle values to be 0,Tire Testrig,Creating a tire loadcase file (cont): Click on Enter name for the new analysis in Name field . Click Add to add a second analysis analysis_2. This is where the user can modify solver parameters like End Time, Number of Steps, Error To

14、lerance, Integrator etc.,Tire Testrig,Creating a tire loadcase file (cont): Double click on analysis_2 - Select Tire tab - Select tire property file as“mdi_fiala02.tir” from the database acar_training_MD.cdb. This tire property has modified CSLIP parameter. Make sure the other inputs to the testrig

15、match those for analysis_1. Click Save As to save this loadcase file in your acar_training.cdb directory. Click Run It. After submitting the job you get information window when the plots are ready. Click OK,Tire Testrig,Reviewing the results in ADAMS/Postprocessor: ADAMS/Postprocessor is launched when the plots are ready. Look at the Longitudinal Force vs. Slip plot. The red curve show the response when CSLIP=1000 and the blue one when CSLIP