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ETTC'2003 - SEE

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All the five points can be achieved using the CRONE Toolbox developed by the<br />

CRONE Team [3].<br />

1.3 - Application to the test-bench<br />

The principal element of this test bench is a hydraulic actuator that<br />

compresses a mechanical structure to be tested with a given profile of position.<br />

The validation tests of the control design method have been achieved on the<br />

hydraulic test-bench of figure 1 that is much smaller than the final test-bench of the<br />

LAMEFIP but that has the same equipment.<br />

Figure 1 – Hydraulic test bench used for validation of the control design<br />

method<br />

The dynamic system to control is at the same time nonlinear and uncertain,<br />

the mechanical structure being by definition unknown and likely to evolve during<br />

the test. The first work consists in establishing a nonlinear physical model of the<br />

bench of tests [4]. Then, although the structures to be tested are badly identified, it<br />

is necessary to establish a model - even uncertain - of these structures. It is<br />

chosen to model them by a mass-damping-spring set whose parameters vary in<br />

certain bounds. Then a set of linear models of the test bench is established using<br />

the linearised-tangent models around the various operating points and using the<br />

various parameters of the structure to be tested (Figure 2).<br />

ETTC2003 European Test and Telemetry Conference

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