Fawzia AMOKRANE : " Contribution to the robust observation of uncertain dynamical systems - Application to small force metrology"

PhD works of Fawzia AMOKRANE : "Contribution to the robust observation of uncertain dynamical systems - Application to small force metrology "

Résumé : Small force metrology has become a strategic research area for several metrology institutes around the world. Indeed, the absence of a force standard in the range below $10 , mu$N makes the force measurements at this scale questionable. The objective of this thesis is to propose a solution to guarantee the traceability of low forces in the range below $100 , mu$N. This issue was addressed by combining the tools of control theory with the ones of conventional metrology. A generator of traceable forces, based on auto-stabilized magnetic springs and the concept of dead weight machines, has then been developed. This generator has been designed and realized to guarantee the application of a vertical force, traceable to the International System of units. A study of the disturbances that degrade the measurement was also made. Among these disturbances, seismic vibrations generate acceleration forces that act in a dynamical and unknown way on this generator. In order to take them into account, an accelerometer was also designed and built. A new unknown input observer, called GeLESO (Generic Linear Extended State Observer), was developed to estimate these seismic accelerations while the associated measurement uncertainty was computed by an new interval observer named GeLESO based interval.

Jury Composition :

Emmanuel PIAT Maître de conférences Université Bourgogne - Franche-Comté, PhD Director

Michel ZASADZINSKI Professeur des Universités Université de Lorraine Reporter

Xavier BRUN Professeur des Universités INSA de Lyon Reporter

Mme Michèle ROMBAUT Professeur des Universités Université Grenoble Alpes Reviewer

Luc JAULIN Professeur des Universités Université de Bretagne Occidentale Reviewer

Zaccaria SILVESTRI Ingénieur de recherche Cnam Reviewer

Adrien DROUOT Maître de conférences Université Bourgogne Franche-Comté Reviewer

Joël ABADIE Ingénieur de recherche CNRS Reviewer

Localization : Amphithéâtre Emilie du Châtelet - ENSMM, 26, Rue de l'Epitaphe- 25000 Besançon