Riassunto analitico
The activity defines a procedure to use 4-Wheel Steer Vehicle experimental data from Sweep Steer and Slow Ramp Steer Test, extending the capability of a Stellantis Software currently used for Vehicle Dynamics Handling Analysis for 2-Wheel Steer Vehicles. A simplified 4 Wheel Steer Vehicle model is developed, extending the Single-Track Model concept. The procedure is verified using VI- CarRealTime Few-Body Simulations(14-DOF), performed at multiple speeds, lateral accelerations, and using multiple rear wheel steer logics. The parameter identification for the Sweep Steer Test is performed in Time Domain using Real Time History, Frequency Domain, and Time Domain using an Ideal Time History, exploring multiple error functions. The Cornering Stiffness, Equivalent Relaxation Lengths, and Yaw Inertia are identified to obtain the Characteristic Vehicle Response Functions. The Axle Characteristics are identified from the Slow Ramp Steer Test using the Magic Formula, and further used to obtain the Steady-State Gradients. Analytical formulas are also used to obtain the kinematic turning diameter. The procedure is validated using experimental measurements performed at Balocco Proving Ground on multiple 4-Wheel Steer Vehicles, at multiple speeds and lateral accelerations. The results obtained from this activity are used for benchmarking.
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Abstract
The activity defines a procedure to use 4-Wheel Steer Vehicle experimental data from Sweep Steer and Slow Ramp Steer Test, extending the capability of a Stellantis Software currently used for Vehicle Dynamics Handling Analysis for 2-Wheel Steer Vehicles. A simplified 4 Wheel Steer Vehicle model is developed, extending the Single-Track Model concept. The procedure is verified using VI- CarRealTime Few-Body Simulations(14-DOF), performed at multiple speeds, lateral accelerations, and using multiple rear wheel steer logics. The parameter identification for the Sweep Steer Test is performed in Time Domain using Real Time History, Frequency Domain, and Time Domain using an Ideal Time History, exploring multiple error functions. The Cornering Stiffness, Equivalent Relaxation Lengths, and Yaw Inertia are identified to obtain the Characteristic Vehicle Response Functions. The Axle Characteristics are identified from the Slow Ramp Steer Test using the Magic Formula, and further used to obtain the Steady-State Gradients. Analytical formulas are also used to obtain the kinematic turning diameter. The procedure is validated using experimental measurements performed at Balocco Proving Ground on multiple 4-Wheel Steer Vehicles, at multiple speeds and lateral accelerations. The results obtained from this activity are used for benchmarking.
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