Mechanical Behavior Of Flexible Photovoltaic Support With Elastic Wind Resistant Cable

With the global energy problem becoming more and more serious,the world photovoltaic industry ushered in greater development.At present,China has dominated the photovoltaic industry,and the future development space and market demand of photovoltaic industry are huge.There are many shortcomings in the traditional rigid photovoltaic support,and the construction and development are limited.The ordinary flexible photovoltaic support can not resist wind load well,so this paper proposes two kinds of flexible photovoltaic support with elastic wind cable,which can reduce the wind-induced response of the structure to a certain extent.The main research contents and achievements of this paper are as follows(1)The numerical wind tunnel simulation of PV array group in different wind directions,different PV inclination angles and two mountain states was carried out to obtain the wind field flow and wind pressure distribution of PV array group;The shape factor of wind load suitable for photovoltaic panel array group is proposed.(2)According to the different characteristics of the two kinds of flexible photovoltaic support with elastic wind resistant cable,the calculation method suitable for the two kinds of flexible photovoltaic support with elastic wind resistant cable is derived by referring to the design theory of suspension structure,and verified by the finite element method.It is found that the theoretical calculation method and the finite element result are almost the same.(3)The AR model based on the linear filtering method is used to obtain the fluctuating wind speed time history of the flexible photovoltaic support with elastic wind resistant cable,and the fluctuating wind speed time history is converted into the wind load time history,which is ready for the next step of wind-induced response analysis of the structure.(4)The finite element models of two kinds of flexible photovoltaic supports with elastic wind resistant cables are established to analyze their dynamic characteristics;The wind-induced vibration response of two kinds of flexible photovoltaic supports is analyzed,and the node displacement time history and element internal force time history of the structure are obtained;And the distribution characteristics of node displacement time history and element internal force time history are analyzed by using normal distribution Q-Q diagram.It is found that the node displacement time history and element internal force time history of the structure basically conform to normal distribution.(5)The displacement augmentation factor,the generalized internal force augmentation factor and the support reaction wind-induced vibration factor of the flexible photovoltaic support with elastic wind resistant cable are defined,and the relationship between the peak wind-induced vibration response of the structure under fluctuating wind load and the response under average wind load is established;The effects of the spring stiffness of the wind resistant cable,the initial prestress level of the load-bearing cable and the mid span sag of the load-bearing cable on the wind-induced vibration coefficients of the two kinds of flexible photovoltaic support structures with elastic wind resistant cable are analyzed,and some meaningful conclusions are obtained;Finally,the displacement augmentation factor,the generalized internal force augmentation factor and the support reaction force wind-induced vibration factor of two kinds of flexible photovoltaic support with elastic wind-resistant cable are given.