Study on Flow Induced Vibration Characteristics of Laminated Plate Structure under High Temperature

In order to study the effect of high temperature on the flow induced vibration characteristics of laminated plate structure, a dynamic equation is established for the simplified laminated plate structure considering the action of viscous incompressible fluid. By solving the characteristic matrix, the sensitivity effects of three temperature-affected parameters (elastic modulus of laminated material, cooling water density and saturated water viscosity) on the natural frequency and critical velocity of instability of laminated plate are analyzed. Furthermore, the effect of temperature on the flow induced vibration characteristics of laminated plate structure is studied when the three parameters change at the same time. The results show that the natural frequencies of laminated plate in static and dynamic water decrease with the increase of temperature; the decrease of the elastic modulus of the laminate material leads to the decrease of the rigidity of the laminated plate, which has the greatest effect on the natural frequency of the laminated plate. At the same time, the critical velocity of instability decreases at first and then increases gradually, but the change range is not significant; the additional mass reduction caused by the reduction of cooling water density has the greatest effect on the critical velocity of instability.