F254-Z3215 - Four Post Rig Wheel Pan Loadcells
Customer: UK based Formula 1 company
Loadcell: F254-Z3215 +15kN -5kN
Special Features: Moment insensitive, Low mass
The customer required four loadcells for a vehicle chassis dynamics rig. The specifications supplied were for measurement of dynamic vertical load, Fz of +15kN to -5kN and insensitive to moments Mx and My. Lateral resonance of the structure must be greater than 1000Hz, with the live mass of the system kept low to minimise inertial force errors. Maximum diameter for the wheel pan was 340mm.
A generic 'pancake' design with a large outer diameter provided a large contact patch area of 320mm diameter for the racecar tyre to bounce upon. The live mass of the structure was the outer ring providing the largest active footprint with the lowest mass. Tests of moment insensitivity were carried out in house by applying a mass of 38.6kgf around a 100mm concentric radius on the loading plate. These tests showed a 0.01% of rated load error due to the offset load.