1. University of Sfax, National School of Engineering of Sfax,CES Laboratory,Tunisia
2. University of Sfax, National School of Engineering of Sfax,CEM Laboratory,Tunisia
3. University of Nantes,IREENA Laboratory,Saint-Nazaire,France,44602
4. Ecole Supérieure des Techniques Aéronautiques et de Construction Automobile (ESTACA),Montigny-le-Bretonneux,France