rb1=vibA*tA1+vibB*tB1
rb2=vibB*tB2+vibA*tA2
all are vectors. * is vector multiplication, ie phase angles are added, moduli are multiplied.
rb = required balance, vib is the measured vibration, t is the influence vector or transfer function.
A is one accelerometer, B is the other. The corrections are applied at planes 1 and 2 on the wheel.
't's will be constant for a given wheel and tyre. I doubt that they can be determined analytically with sufficient accuracy.
Cheers
Greg Locock