Effect of each direction component in 3D wind field on dynamic response of heliostat

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (8) : 156-163.

FENG Yu,CHEN Xiao’an

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Abstract

In the process of the wind-resistant design of heliostat,only longitudinal wind was considered and vertical and transverse winds were neglected in literature.For this reason,power spectrums of fluctuating wind pressure in different wind directions and an AR model were proposed to simulate time history samples for 3D wind field in this work.And then the mean wind loads and fluctuating wind loads were applied to the finite element model of the heliostat.The effects of each direction component of the wind field on heliostat were investigated by evaluating dynamic characteristics and wind-induced dynamic responses of the heliostat in five positions.The results show that the vertical and transverse fluctuating winds may cause the resonant response in the first five natural frequencies of the heliostat.Furthermore,the wind vibration coefficients of displacement for operational positions are small,in which only the longitudinal and vertical winds can be taken as the influence factors of dynamic responses.In contrast,the wind vibration coefficients of displacement are large as well as the longitudinal,vertical,and transverse winds should be taken into account simultaneously when the heliostat is in survival stow positions.

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heliostat / 3D wind field / power spectrum of fluctuating wind pressure / AR model / dynamic response

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FENG Yu,CHEN Xiao’an. Effect of each direction component in 3D wind field on dynamic response of heliostat[J]. Journal of Vibration and Shock, 2017, 36(8): 156-163

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