How onboard IMU, wheel-speed, and strain-gauge streams from a single vehicle are used to adjust the free parameters of a template multi-body model until it converges on that vehicle's actual physical behavior.
The initial twin is instantiated from a trim-level template: nominal spring rate, damper curve, and bushing stiffness published by the supplier. As the vehicle accumulates mileage, an onboard estimator compares predicted suspension travel against measured travel and nudges the twin's parameters toward the residual that minimizes that specific car's prediction error—typically converging within the first 2,000 to 5,000 kilometers of ordinary driving.
Raw estimator output is vulnerable to temperature drift, wiring degradation, or a momentarily loose connector being misread as chassis wear. The twin cross-validates candidate parameter shifts against a physically plausible envelope derived from the vehicle's known material properties, rejecting updates that would imply, for example, a spring rate change impossible within a single week of driving.