On global bending–shear core transition effects for the vibroacoustic of sandwich structures: Analytical and numerical investigations /O. Baho a,b,1 , Z. Zergoune a,b,1 , M.N. Ichchou b, ⇑ , B. Harras a , R. Benamar c , B. Troclet d , O. Bareille b - Baho,O.