Suspensions have become more complex in order to get the right combination of ride and refinement and handling, which is always a challenge--that's exactly where you need an SPMM," says Best.
An SPMM measures parameters: there's the same number of those irrespective of the number of bushes and suspension arms.
An SPMM takes around five hours but it has been done in half that.
Best refers to his new generation SPMM as a dynamic kinematics and compliance machine--but it's only dynamic to the extent that it gives good results at 2Hz.
A recent development is a converter, allowing SPMM data to be exported directly into the CarSim multibody vehicle dynamic modelling tool.
Once you've got the right tyre characteristics, and inertial characteristics, which we can also measure on the SPMM, you can start dynamic modelling of the whole vehicle and see how it behaves doing a certain manoeuvre.
The SPMM records the wheel displacements and forces and moments occurring at the tyre to road interface, caused by bounce, roll and pitch of the vehicle body and also by the application of simulated cornering, braking and traction forces.