VIBRATIONAL BEHAVIOR OF JOINED-PLATE STRU CTURES

The aim Of this work is to explain the vibrational behaviour of severa l plate structures whose plates are joined at different angles, having same widths but different lengths. An analytical formulation using a semi modal decomposition along the junction direction and a wave formu lation along the perpendicular one is developed. This approach is very powerful because its numerical implementation is not too heavy (contr ary to FEM) and because it's very versatile. Basic vibrational control parameters such as the quadratic velocity and the transfert mobility are shown. The simplest structure considered in this study is made of twin plates connected at any angle. It is shown that in some particula r configuration, the vibrational behaviour of the structure can be hig hly sensitive to slight modifications of a geometrical parameter, part icularly the angle between the plates. A statistical way is used to il lustrate this phenomenon currently encountered in industrial applicati ons. This formulation can also deal with periodic structures such as c orrugated plates.