| Abstract |
In this contribution, two methods for the estimation of the mechanical parameters of a rotating threeinertia
system are presented. The estimation methods have been tested at two different experimental
set-ups. Each experimental set-up consists of a motor, which is connected to a load machine by
a coupling and a shaft. The set-ups have to be considered at least as weakly damped three-inertia
systems. The first presented estimation method is the classic Least-Squares estimation with ARMAXmodel
(Auto-Regression with Moving Average and eXtra inputs) with high order. With this method,
the resonant frequencies are extracted and from them and from the total inertia the three inertias
and the two torsional stiffnesses are calculated. The second method is a more graphical one. From
the FFT of the system response the maximum values and the minimum values are searched for. The
dominant frequencies are found with suitable criterions. The results, which are achieved with both
methods, are accurate enough for designing a state controller, which damps both resonances actively.
The classic estimation method can be fitted to other systems, whereas the graphical method takes
much less calculation time and is less sensitive to disturbance. |
