| The heliostats of solar-thermal power tower are emerging in recent years,which is a solar power generation system,using a large number of mirrors converging light on target tower and to have the effect of solar power generation.The wind resistance design of heliostat has always been a difficult problem,general design of heliostat has to meet the requirement of normal work under the force 6 wind and no destruction under force 10 wind.It should be sure that the sunlight through the reflection of the the mirror can accurately target the object all the time.Heliostat is susceptible to damage under strong wind,which makes it necessary to study the wind load and wind-induced response of heliostat.Firstly,this paper introduces development of the solar-thermal power tower heliostat,and the research progress of the wind-induced response,non-Gaussian peak factor,wind-induced fatigue were summarized;Secondly,on the basis of wind tunnel test,the distribution of the wind pressure of the mirror surface and shape coefficient under the condition with different wind angle and elevation has been studied;Thirdly,the higher order statistics distribution of the mirror under different wind angle and elevation has been compared,the wind pressure probabilistic distribution research has also been done,putting forward a variety of wind pressure probabilistic distribution hybrid model,improving the peak factor arithmetic,and compared the accuracy and applicability of the several arithmetics;Fourthly,the time history analysis method is adopted to analyse the wind-induced vibration of heliostat,and using four different methods respectively to calculate the cumulative fatigue damage of heliostat both in time domain and frequency domain,and comparing their accuracy;Finally,using the TPP method,the research of the local wind-induced damage characteristics of mirror has been done,which is also based on the theory of the probability,the failure probability under a certain condition has been analysed. |
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