Noor III光热电站吸热塔气动阻尼研究

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Abstract Heat absorption tower of Noor III solar thermal power station in Morocco, Africa was taken as engineering background.The wind tunnel test results at University of Western Ontario in Canada showed that the tower displacement value under the designed wind velocity is 40% higher than the code value, but the structure’s vortex-induced vibration (VIV) critical wind speed is lower than the designed wind speed, and the response in crosswind direction within VIV area has a control action.Accordingly, an aero-elastic model for the tower was tested in wind tunnel.A 15 min-long acceleration time-history was collected at the top of the model under different structural damping ratios.Aerodynamic damping ratios were obtained using the random decrement technique and the extended Kalman filtering method, respectively.The results showed that aerodynamic damping ratios recognized with the two methods agree better each other; the total damping ratios recognized at different acceleration amplitudes firstly increase and then decrease with increase in acceleration amplitude; according to ASCE/SEI7-10, the identified aerodynamic damping ratio is negative and the minimum at wind speed of 6.5 m/s under the recurrence period of 50-year and C geomorphologic condition; these laws provide a reasonable explanation for the phenomenon of the response in crosswind direction within VIV area having a control action.

Key words： towering structure vortex induced vibration aerodynamic damping ratio random decrement technique extended Kalman filter

Received: 07 June 2017 Published: 28 October 2018

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I21/177

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