Processing and Analysis of Calspan Tire Measurements of Goodyear Custom PolysteelP195/75R14 Tire

摘要

Although light-vehicle tire-friction parameters are available for use withvehicle computer simulations in the form of Calspan coefficients for a large number of tires (1), most of the tests which produced these results were conducted with the test tire under modest operating conditions. In such tests, tires are generally tested under typical normal loads and with small slip and camber angles. The tire forces and moments produced by tire models employing such coefficients may be acceptable as long as the maneuvers being simulated do not exceed the test conditions which produced the coefficients. However, once the maneuver being simulated exceeds the test conditions, the tire model may not be able to accurately simulate tire friction forces due to the complex nature of tire-terrain interaction. This is particularly true when simulating vehicles in severe handling and braking scenarios, spin-outs, and rollover situations. The tires of vehicles in such extreme maneuvers experience a wide range of normal loads, slip and chamber angles, and slip ratios. It is in response to the need to simulate a vehicle operating under these extreme conditions that Calspan Corporation conducted a comprehensive set of tests on one size and model of light-vehicle tire. That tire was the Goodyear Custom Polysteel P195/75R14 tire. The simulation being used to investigate the tripped-rollover response of light vehicles (2) was the Advanced Dynamic Vehicle Simulation (ADVS) (3)-(5) developed by A.G. Nalecz at the University of Missouri-Columbia (UMC). The report does not cover the experimental test procedure, but rather the processing and analysis of the experimental data and the validation of the ADVS tire friction model performed by UMC.