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calculate damping ratios using the quarter car approximation. Remember the quarter car approximation is a very powerful tool to estimate what our damping rates should be and the spring
The high damping ratios immediately suggest that body control is paramount. Looking at the bump at 13mm/s the damping ratio jumps to 2.03. This indicates the damper engineer is trying to give some feel to the car as well as load the tyres. Beyond this range the dampers blow off to a low ratio to allow the car to ride the bumps. In rebound
a FSAE car will require a damping ratio of 0.5-0.7 to control the heave, pitch and roll resonances of the sprung mass, and a damping ratio of 0.3-0.5 to control the unsprung mass. But this is NOT the entire answer, so keep reading!
25 Οκτ 2016 · Here is the graphs I have available to me, left is front dampers, right is the rear. There is "open" and "closed" values, which as I understand the ECU is able to use a actuator to open and close valves to vary the damping.
The first step is to calculate the desired damping in ride, single wheel bump, roll, and finally pitch. An undamped system will tend to eternally vibrate at its natural frequency. As the damping ratio is increased from zero, the oscillation trails off as the system approaches a steady state value.
body motion and lightly damped to allow the bumps to blow off. The heart of this approach was to evaluate the natural frequency of the quarter car model and then use this to evaluate the damping ratio. For the readers convenience I’ll present the two equations below, which are the heart of the technique, B B 0 m K ω = (7) B ω C 2 m 0 B ...
reduce the amount of oscillation resultant from road bumps, in return reducing the need for a flat ride. Damping ratios will be explained in the next tech tip in detail.
