VIBRATIONAL BEHAVIOR OF LATTICES OF PLATES - BASIC BEHAVIOR AND HYPERSENSITIVITY PHENOMENA

This paper deals with lattices of plates connected at a non-zero angle . The purpose is not only to identify the usual behaviour of lattices of plates (where pass-bands and stop-bands appear) but also to explain the rise of the amber-band. The notion of hypersensitivity existing f or the case of two plates still exists for the case of a lattice of pl ates. When dealing with a lattice of identical systems, it is usual to observe the behaviour when some defects are included. This kind of st udy is proposed in this work, and some rules describing the rise of ef fects due to angular defects at a connection angle are proposed. A stu dy focusing on a lattice of different coupled plates, is also proposed ; a numerical approach shows results which could be suitable for an ex perimental tool detecting hypersensitive connections. (C) 1997 Academi c Press Limited.