- #1

LIL2606

- 9

- 1

**Hi everyone, thank you for reading my thread I know the question is weird but I can't seem to explain it otherwise.**

**My problem:**

Basically I am finishing a final year project which I based on a Formula Student Vehicle. Using CAD I have the vehicle modeled, and through the model analysis and with the help of excel I have a CG value for the whole car, and I have inertia momentum values for each sub assembly which I combined using the parallel axis theorem to get Ixx Iyy and Izz for the whole car. Roll Pitch Yaw.

**General Questions:**

Are they supposed to characterise the loads through the car? Pitch - Squat and Dive, Yaw - over steer under steer, Roll (??) - Cornering lateral loads?

**After research:**

The way I wrapped my head around this so far, and came up with the idea that it might have to do something with the load transfers, is that inertia is a characteristic describing a body's tendency to stay unchanged. These inertia momentum values are part of a matrix and this matrix describes the values of a rotating body in different positions. So the two combined and I might be wrong here, is that these values are describing how the car "doesn't want to" dive or squat or, spin... but I can't seem to find any evidence behind this, and while I know my whole car's Ixx Iyy and Izz values, I can't involve them in any of my calculations, when I look at for example on a straight line acceleration case..

Specified question:

Specified question:

If I tried to calculate a straight line acceleration - with a vehicle 45%FWD weight distribution, 1600 wheelbase, 200 kg, for a 1 meter fraction of the track, from velocity = 0, slip or power limited acceleration (I'd calculate both and would go with the smaller value), unequal length double A-arm suspension, with Prod and a spring. - how would I involve Iyy, the pitch inertia momentum which (decides) how much the car will (not want to) squat?

**Thank you very much!**