Simulation for a Bridge Section Model&rsquo;s Wind Tunnel Test Based on Feedback Control

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 120-126.

Simulation for a Bridge Section Model’s Wind Tunnel Test Based on Feedback Control

DENG Zhi,SONG Hanwen

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Abstract

When a bridge stays in a windy environment,the aerodynamic force makes it act as a non-classic system.For studying this,a five-parameter bridge segment model based on active control was proposed here to simalate a bridge section wind tunnel test model with eight flutter derivatives.According to the principle of equivalent force system,the proposed model constructed with the signal feedback technique coincided with the wind tunnel test model in the aspects of mathematics and mechanics.With a geometric transformation,the linear displacement signals measured in the wind tannel test could be transformed into the angular displacement signals.Meanwhile,the system’s FRF matrix was obtained with the MIMO analysis technique simply and accurately.Then the control parameters were identified with the left-right eigenvectors identification algorithm based on the complex modal theory.Through simulations,the rationality of the proposed model was validated.The results revealed the application prospect of the proposed model in bridge wind-induced vibration study.

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wind-induced vibration / active control / modal analysis / parametric identification

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DENG Zhi,SONG Hanwen. Simulation for a Bridge Section Model’s Wind Tunnel Test Based on Feedback Control[J]. Journal of Vibration and Shock, 2017, 36(5): 120-126

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