Juan 🏎️ Profile picture
Aug 7, 2022 9 tweets 3 min read Read on X
A very useful computation in vehicle dynamics is the g-g diagram. What the heck is that? Well... ⤵️ #F1Tech 🏎
Given a car, its set-up, and a velocity, the g-g diagram represents its acceleration envelope: the maximum acceleration the car can perform. Image
Higher longitudinal accelerations mean the car has more traction and it can brake harder, whereas higher lateral accelerations mean the car can squeeze through tighter corners
What can be used for: have a glimpse on how a car will perform, study different set-ups, detect design flaws, and to learn vehicle dynamics. Data obtained from g-g diagrams is also usually fed to simplistic quasi-steady optimal laptime simulators
How does the car performance vary with velocity? Acceleration decreases (higher drag), lateral acceleration increased (higher downforce), braking acceleration increases (higher drag + higher dwf). In the traction zone, pyramid shape means tire limited whereas flat is engine ltd.
The effect of brake bias its only noted at negative longitudinal accelerations, with braking 60% with the front the best
Aero balance can be analyzed too, having the best cornering dynamics in my particular study case (not in general) with 45% FW and 55% RW
Lastly, we see how critical is the height of the center of mass as it worsens the whole performance of the car as expected
Many other car and setup configurations can be studied! The g-g diagram is a computation module available for free in Fastest-lap! Now available in windows 😊 Head to the link for more info github.com/juanmanzanero/…

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More from @fastestlap_f1

Aug 21, 2022
The brake-bias is one of the adjustments more often tweaked by the drivers🕹

The 5️⃣7️⃣.0️⃣ in the picture means the front brakes will have 57% of the braking force and the rears the remaining 43%.

But do you 🫵🏼 know does it really work? Let's discover it! 🧵🏎 #F1Tech
(You might benefit from some technical concepts explained here ⤵️. Consider taking a read first!)
A decelerating tire needs to roll slower than the free-rolling tire rate, v/R. In this case, the longitudinal slip ratio is negative.
Read 13 tweets
Aug 14, 2022
In Formula 1, performance is dictated by the tires. But how do they work? How drivers extract their maximum grip? Let's learn about it! #F1Tech
A tire is free-rolling when it rotates at a rate, ω, such that the points at the contact patch move with the same velocity of the tire hub, v. This rate is ω=v/R. Under these assumption, and if we neglect the rolling resistance, the tire produces zero grip and its speed stays...
... unchanged. If we roll a carpet around the tire, we would see that it is left on the road perfectly unwrinkled. The velocity of the contact point, vc = v-ωR, will be zero. Under real conditions, tires need to violate this condition to generate grip.
Read 24 tweets

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