Variational approach for mechatronic tolerancing: application to a DC motor Hana Siala, Faïda Mhenni, Maher Barkallah, Jean-Yves Choley, Jamel Louati and Mohamed Haddar Mechanics & Industry, 21 2 (2020) 206 Published online: 07 February 2020 DOI: 10.1051/meca/2019056