Based On MIMO System Flutter Derivative Identification And Suspension Bridge Flutter And Buffeting Research

The structure characteristics of the suspension bridge bring its wind-induced responses problems, This paper set yuzui Yangtze river bridge as engineering background. Base on the suspension bridge identify flutter derivatives, aerostatic stability and response of buffeting. The overall study bridge wind researchs. This paper introduced the new place is multiple input multiple output system (MIMO systems) that simulate the bridge section flutter derivatives.This paper mainly work and conclusions are follows:(1) According to the Gaussian excitational input,the FLUENT software got the aerodynamic output. Through the system theory of multiple input multiple output system (MIMO systems), simulate the thin plate and bridge section flutter derivatives.And contrast with the theoretical solution of plate. The results show that the method has the characteristics of reliable and fast.(2) According to the incremental and internal and external twofold iterative method, use ANSYS software APDL language to study aerostatic stability analysis of yuzui Yangtze river bridge. Results show that the suspension bridge aerostatic instability is the space coupling instability forms.Its instability process relate the bridge sections of static three component coefficient and initial Angle of attack. With the increase of the initial attack Angle, reduced stability of Bridges.(3) Adopts MATLAB software, using spectral representation and fixed inverse Fourier transform method simulate fluctuating wind field of bridge. And found fixed inverse Fourier change method is a kind of more accurate method.(4) Adopts self-excited force model of LIN, through ANSYS software of the APDL language, analysis bridge for vibration of time domain method, show that self-excited force under the low speed of bridge structure has an inhibitory effect.(5) Use the frequency domain method to analyze bridge structure, and with the time domain method consistency analysis. Obtained the buffeting bridge is the first frequency vibration primarily.