Suspension Testing Report.docx - Objective By changing the pressures in the shocks the ride height is changed the sag percentage is changed and the

Suspension Testing Report.docx - Objective By changing the...

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Objective By changing the pressures in the shocks the ride height is changed, the sag percentage is changed and the overall suspension geometry is changed. This test will determine the shock pressures that yield the best ride quality which will be quantified with a calculation of driver average absorbed power (AAP). Procedure/Setup An IPhone 6s was attached to the floor of the car just in front of the seat. Its accelerometer was used to collect motion information. A 10Hz Low pass filter was used to eliminate engine noise. The accelerometer recording was started and then three laps were driven. The suspension settings were then changed and the process was repeated. Both the Evol Shocks and Float Shocks were tested. The majority of the testing was on the Floats. Results As it can be seen in Figure 1, the lowest average absorbed power was seen when the shock pressures were 40 front and 45 rear. This corresponded to an average absorbed power of 1.03W. These pressures happen to correspond to the designed ride height of 9.4F/9R (in) and sag of 33% F/R (with a 165lb driver). In order to keep the same geometry for a lighter or heavier driver, the pressures would need to be changed. It is important to note that the track had few large obstacles and did have frequent jumps. 15 20 25 30 35 40 45 50 55 60 65 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 Effect of Shock Pressure on Driver Average Absorbed Power Front Pressure (psi) (Rear = Front + 5 psi) Average Absorbed Power (W) Figure 1: Float Shocks Average Absorbed Power
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0 5 10 15 20 25 30 35 01:16. 01:17. 01:18. 01:19. 01:19. 01:20. 01:21. 01:22. 01:23. Effect of Experience on Lap Times Run Number Lap TIme (min:sec) Figure 2: Experience
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It can be seen in Figure 2 that the effect of driver experience has a very clear effect on the Lap Times. This result nullifies any conclusions that could be made from Figure 3. It can be concluded that the shock pressures did not have a significant effect on lap times.
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  • Fall '08
  • Yong,Y
  • Shake, Suspension, washboards

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