Steady-State Error
Steady-state error is the allowed difference for the dynamic stiffness and loss angle between two consecutive cycles of the sinusoidal excitation. The computations for a particular frequency of excitation terminate when the calculated error is less than the tolerance.
The steady-state error tolerance is dimensionless. Specifically, the error tolerance is satisfied if, for two consecutive cycles of the sinusoidal excitation:
error_dynamic_stiffness < (steady-state error)
and
error_loss_angle < (steady-state error)
where,
error_dynamic_stiffness =
Max(stiffness_calculated(amplitude_1)/stiffness_max_measured
(amplitude_1),...,
stiffness_calculated(amplitude_n)/stiffness_max_measured
(amplitude_n))
error_loss_angle =
Max(loss_angle_calculated(amplitude_1)/loss_angle_max_measured
(amplitude_1),
...,loss_angle_calculated(amplitude_n)/loss_angle_max_measured
(amplitude_n))
and the stiffness and cdyn and loss angle are calculated over one sinusoid cycle.
The steady state error indicates when the system is considered to be in steady state condition. This is used to shorten the overall CPU time.