ETTC'2003 - SEE

All the five points can be achieved using the CRONE Toolbox developed by the
CRONE Team [3].
1.3 - Application to the test-bench
The principal element of this test bench is a hydraulic actuator that
compresses a mechanical structure to be tested with a given profile of position.
The validation tests of the control design method have been achieved on the
hydraulic test-bench of figure 1 that is much smaller than the final test-bench of the
LAMEFIP but that has the same equipment.
Figure 1 – Hydraulic test bench used for validation of the control design
method
The dynamic system to control is at the same time nonlinear and uncertain,
the mechanical structure being by definition unknown and likely to evolve during
the test. The first work consists in establishing a nonlinear physical model of the
bench of tests [4]. Then, although the structures to be tested are badly identified, it
is necessary to establish a model - even uncertain - of these structures. It is
chosen to model them by a mass-damping-spring set whose parameters vary in
certain bounds. Then a set of linear models of the test bench is established using
the linearised-tangent models around the various operating points and using the
various parameters of the structure to be tested (Figure 2).
ETTC2003 European Test and Telemetry Conference