Structural Simulation

Chassis Torsional Stiffness Simulation

Écurie Aix · RWTH Aachen Formula Student
01 What

The previous-year chassis (EXO4) wasn't stiff enough, causing the monocoque to act as an unintended third spring between the front and rear suspension. I took ownership of the stiffness target from first principles, learning by doing: I picked up FEA in Altair HyperMesh and delivered a validated result within a matter of months, open to feedback from the suspension department and drivers throughout.

02 How
  1. 01Derived the stiffness target by weighing lap-time gains against the mass penalty of a stiffer structure, informed by suspension-department and driver feedback.
  2. 02Mechanical balance tolerance sets the minimum torsional stiffness target.
  3. 03Built the monocoque FE model in Altair HyperMesh, applied the torsion load case, and extracted deflection to calculate stiffness.
03 Result
  • -Raised torsional stiffness by 75%, while mass increased by only 35%.
  • -Correlated the FEA prediction against the team's prior-year physical test bench data to within ~2% error.
  • -Delivered within all constraints, including the frame mass target.