DYNAMIC RESPONSE OF COMPOSITE PANELS WITH RANDOM MATERIAL PROPERTIES AND RANDOM LOADING

摘要

In most engineering applications, vibration is generally undesirable and its accurate prediction is important. In determining the dynamic response of system made of composites, it is customary to assume that the given system has precisely defined properties. However, due to the large number of parameters associated with its manufacturing and fabrication processes and our inability to control all of them precisely, the system properties can at best be obtained only within a certain range. The uncertainties inherent in the system response induced by uncertainties in the system parameters and randomness in external excitation need to be incorporated in the system modeling for a rigorous analysis. In the present study, a formulation based on state-space approach is presented for curved composite panels with all edges simply supported and having material properties and excitation as random. The material properties have been modeled as random variables with the excitation as a random process in time. Results are presented for symmetric and anti-symmetric cross-ply laminated spherical and cylindrical panels. The response has been compared with independent Monte Carlo simulation.