Reseach On Vibration Of Guide Wall And Damage Identify Based On ANSYS

Vibration of guide wall structures belongs to vibration of fluid-structure interaction. For vibration of guide wall, interaction vibration of structures with fluid dynamical loads needs to be studied; safety of structures is also included. In the paper, according to the results of model test of nuozhadu power station, the main problems studied are as follows:1) According to random function theory and power spectral analysis method, dynamical loads on the guide wall are studied on the model testing. results clarify that aeration enhances flow turbulence; standard deviation is 2-3 times more than that without aerified.2) According to the theory of proper orthogonal decomposition, fluctuating pressure on the boder of high-velocity flow is studied, high dimensional decomposition theory of fluctuating pressure is supplemented, coherent structures are separated.results indicate that there are two modes in the fluctuating pressure on the boder, in other words, coherent structures correspond to the positive mode of fluctuating pressure, and random quantities correspond to negative mode.3) Analysis system of guide wall structures is built by secondary development language of ANSYS, modeling and analysis of guide wall on condition of complex foundation is also included.Compared to previous programs, it is integrated, professional and easy to use.4) According to modal theory and structure response theory, vibration of guide wall with huge faultage is studied during model testing.It is belived that depth of physical model is 1.5-2 times of the height of guide wall, width of of physical model is the same size as the height of guide wall; and it is concentrated of dynamical stress at the conjunction of guide wall and faultage, batholith and faultage, which is the point to protect.5) Three dimensional damage identify of structure is studied based on damage factor of modal strain energy dissipation ratio.Damage factors around location of damage is symmetry ,which is sign of damage;damage extent can be found out by first 2-3 bending modes.