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Slide rules: analysing an oversteering car
What makes a car quick in steady state and in transient? Claude Rouelle develops his analysis of lateral acceleration and yaw moment variation. In April’s RE (V27N4), we saw that there are 12 causes for the yaw moment: four tyre lateral forces Fy, four tyre longitudinal forces Fx; and four tyre self-alignment moments Mz.
Getting to grips with your yaw moments
One important part of a racecar performance engineer’s job is lap time simulation. Simulating and comparing the effect of car design and set-up parameters on the lap time is essential. With the many inputs and outputs that exist in such simulation, it is always worth having metrics other than the lap time to know if and why we improve the car’s performance.
Intelligent Testing to Advance Vehicle Performance
In February 2010 OptimumG in collaboration with Oreste Berta S.A. performed a comprehensive vehicle dynamics test in Argentina. The primary goals of this test were to characterize vehicle performance and demonstrate what is possible with advanced data acquisition.
Vehicle data acquisition using CAN
Data acquisition is one of the best tools to increase the understanding of vehicle behavior. One can get tons of information just from a couple of potentiometers and accelerometers connected to a simple data logger. However as one adds more and more sensors a number of problems arise. First, the number of cables and connectors increase to where it becomes both a logistical and economical issue.