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Dynamic Simulation of Late Model Car Performance on a Dirt Track
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English
Abstract
The objective was to determine the effects of dirt track geometry, the driver's elliptical path, and the car parameters on lap time. A dynamic simulation model was developed to: 1) investigate variables over which a racing team has control for a Late Model Class car on a short dirt track, and 2) compare them to actual field observations at a local track. The suspension dynamics were not included; overall tire COF (Mu) was used. Designed experiments predicted lap time. Considered were car mass, rotating mass, gear ratio, Mu, engine torque, aerodynamic & tire drag, track geometry, and elliptical path axis angle.
Mu was critical. Matching tires to track surface dominated reducing lap time, followed by driver judgement on braking point. Slight differences were significant. Simulation times compared well with the fastest cars.
Quantitative performance data on dirt tires is needed.
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Authors
Citation
Furney, C., "Dynamic Simulation of Late Model Car Performance on a Dirt Track," SAE Technical Paper 962530, 1996, https://doi.org/10.4271/962530.Also In
References
- Cann, Hathaway Vochaska “Critical Suspension Relationships and their Influence on Transient Behavior of Performance Vehicles” SAE December 1994
- Brown et al “National Speedway Directory” 1995 National Speedway Directory Comstock Park, MI 49321
- Allen, R.W. Magdaleno, R.E. Rosenthal, T. J. Klyde, D.H. Hogue, J. R. “Tire Modeling Requirements for Vehicle Dynamic Simulation” SAE Paper 514 December 1995
- “VISSIM”, Version 2.0, a commercial PC program for simulating dynamic systems Visual Solutions, Inc. Westford, MA