The Study Of Comparative On The Mechanical Properties1.25-MW Taper Cylinder Tower With Hybrid Wind Tower

Wind turbine tower, as the main supporting device, plays an important role inensuring its security and reliability. The cone type tower is generally applied in theinternational wind power market. However, the transportation and price problem of thecone type tower come to surface with the wind turbine generator gradually upsizing.Therefore, it is significant to study and design a new type of tower structure.In order to further research and analysis, this article makes the S6x-1.25MWcone type tower on Huitengxile wind farm in Inner Mongolia as a research object, doesa environmental pulse measurement with the vibration test equipment. Applying theANSYS finite element software and the theoretical calculation, the dynamiccharacteristics, the strength, stiffness and stability of the tower are analyzed. Under thedesign conditions of the wind farm, this paper designs a1.25MW hybrid tower, andwith the help of ANSYS finite element software to do the evaluation, makes acomprehensive comparative analysis on the two forms of the tower at last.Research results show that the tower inherent frequency of the environmental pulsemeasured results, the theoretical calculation as well as the finite element analysis resultsis consistent, the wind power tower can avoid resonance effectively. According to thetheoretical calculation and finite element analysis, we can see that the strength, stiffnessand stability of the tower all meet the relevant requirements, and the both calculationresults are in a reasonable range. The strength bearing capacity of the tower1379kN ishigher than the stability bearing capacity1067kN, it is proved that the tower isdetermined by the stability, the stability of the cone-type tower structure depends on thestorm’s first order buckling critical load of wind speed conditions. To the hybrid windpower tower, the stability of the pillar strength and the section at the top of the tower isthe main factor to control the design, when the aspect ratio is between1/8¹/9, theslope is between8.5¹1.5, H₁/H₂（H₁is the part at the bottom of the lattice tower height, H₂is the section at the top of the tower height） is1.2¹.6, the design of thehybrid wind power tower is relatively reasonable, it can not only satisfy the strength,stiffness, stability and dynamic characteristics requirement of the tower, but also meetthe appropriate amount of steel. Compared with the cone type tower, in the aspect ofmechanical performance, economy and transportation, the hybrid tower has obviousadvantages, in the aspect of strength utilization can be increased by35%, horizontalstiffness can be increased by15%, steel can be saved by35%, but the more constructionprocess, longer construction period is the main factor restricting its development.The environmental pulse measured results can be used as a reference of windpower tower structure dynamic characteristics analysis. Through the comparativeanalysis study of these two types of tower, this article provides a scientific and rationalguidance for the design of large-scale wind turbine tower.