摘要：Based on Mindlin plate theory, Timoshenko beam theory and Bloch’s theorem, an improved finite element model for periodic stiffened plate structures with any number or orientation of stiffeners is developed to describe the propagation of elastic waves in the periodic structures undergoing flexural vibration. Using the finite element model, the flexural vibration band gaps of a periodic grid structure and several periodic stiffened plate structures with different skin thicknesses are compared and analyzed. The results indicate that the vibration coupling between the skin and the stiffeners influences the formation of flexural vibration band gaps.
关键词：phononic crystals; band gaps; periodic structures; stiffened plates; vibration and noise control
