Structural strength analysis of meteorological tower under Antarctic inland climate conditions and its influence on wind speed measurement
Antarctic continent is in the southernmost part of the earth.The climate conditions there is special,and has the largest glacier in the world.Nowadays,more evidences show that Antarctic climate change plays an important role on global climate change.Therefore,Antarctic meteorological monitoring is of great significance to the study of global climate change.In recent years,countries have paid much more attention to the monitoring of Antarctic meteorology,and there are many automatic weather stations established in the Antarctic especially in the inland area.For the harsh climate of Antarctic continent and long-term unattended running conditions of the stations,it has high requirements of the structural strength and stability of the meteorological tower.In this paper,the structural strength of meteorological tower and its influence on wind speed measurement are studied.Guyed mast structure,the structure of the meteorological tower,is sensitive to wind.Unfortunately,Antarctic continent has the strongest wind on earth.The high wind-speed in the Antarctic region would cause the tower to vibrate violently.Under long-term dynamic load,the tower may have serious wind-induced fatigue damage,which may lead a shortened life of the tower.So we have to analyze the wind-induced fatigue under cyclic wind loads.The extreme wind in Antarctic continent may break down the meteorological tower,rendering it inopera-ble,so analysis of the tower's buckling stability is also necessary.Base on the concurrence of solid and fluid,fluid-solid coupling analysis is a good method for the simulation in this paper.On the one hand,the strength of the meteorological tower can be discussed in the actual size,and on the other hand,this method is more suitable for long-term dynamic load simulation.Using the 24-hour meteorological data of the larger wind day of the Ant-arctic Taishan Station on July 17,2017,the fluid-solid coupling analysis was carried out.In the case of a calcu-lated scale factor of 20,the minimum safety factor for one-month circulation is still 1.065 by using rain-flow method,which indicates that the current structure of the meteorological tower has a good fatigue life.Through the buckling stability analysis,it is found that the minimum safety factor is still 3.8016 under the wind-speed of 50 m·s-1,which indicates that the meteorological tower can remain stable in the Antarctic.Wind speed measure-ment is an important work of the meteorological tower.However,the structure of the tower would affect the measurement of wind speed.In order to ensure the accuracy of the wind speed,we should analyze how the struc-ture of the tower affects the wind speed measurement.The working conditions of the meteorological tower under different wind-speed are simulated,and the maximum average deviation from the original wind speed is only 1.37％.It shows that the structure of the meteorological tower has little influence on the measurement data of the wind speed sensor,which ensures the reliability of the Antarctic meteorological data monitored by the meteoro-logical tower.The result of the analysis prove that the structure of the meteorological tower has a reliable struc-ture strength and can provide a reliable data of Antarctic wind-speed.
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