System
Identification by Self-excited Oscillation Method
&nbs=
p;
It has be=
en
known that a hydraulic servo system can be generally dealt with a second or=
der
delay element for designing an adequate controller. Our research group
developed a simple method utilizing the self-excited oscillation of a hydra=
ulic
servo system to directly estimate the dynamic parameters such as the damping
ratio and undamped natural frequency. The advantage of this method is the &=
#8220;on-line”
ability that is able to identify these parameters instantaneously with chan=
ging
the operating conditions.
&nbs=
p;
![](3D"Identification.files/image010.gif")
Figure Angular position
self-excited oscillation system
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p;
![](3D"Identification.files/image004.gif")
&nbs=
p;
Figur=
e Schematic diagram of hydraulic servo motor system=
=
![](3D"Identification.files/image012.gif")
&nbs=
p;
Figure Experimental system
![3D"Moto_PS.WMF"](3D"Identification.files/image014.gif")
Figure Identified parameters with changing supply pressure
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