Ouissi, Mohammed NabilHoumat, Abderrahim2013-03-112013-03-112013-03-11https://dspace.univ-tlemcen.dz/handle/112/1544A bi-hierarchical four nodes quadrilateral element with three displacements as degrees of freedom by node is developped to analyze the free vibration of isotropic shells of revollution with linearly varying thicknessenNON AXISYMMETRIC FREE VIBRATION ANALYSIS OF LINEARLY VARYING THICKNESS SHELLS OF REVOLUTION BY A BIHIERARCHICAL FINITE ELEMENTOther