Static And Dynamical Behavior Of Huge Vertical-Axis Wind Turbine

The problem of energe sources is becoming one of the grimmest problems we face recently.Wind power is reproducible energy ,which is mature in technic,and possesses of potential to empolder,and it is likely to be an important substitute of energy in the future.People now pay more and more attention to new types of wind turbines. Wind turbine can be classified into two groups:horizontal axis wind turbine and vertical axis wind turbine. Horizontal axis wind turbine is traditionally and broadly used,while vertical axis wind turbine is the trandency in the future for its superexcellence performance.The huge vertical-axis wind turbin belongs to towery mast in structure,and possesses some characteristics of rotor in working state,and constitutes a complex structure system because towery mast and dynamical rotor act one another. The dynamical behavior of the turbine structure is analysed and explained with the help of software Ansys in this paper.Static calculation mainly aims at the reaction on the rotor, laminas,cables and nodes under the action of the centrifugal force. We can see from the calculation that the tensile force is greater than the bending moment of the lamina,which accords with the trait that the specified material is more able to bare tension than bending. For the cable and the bar, their tension stress change slightly under the different rotate speed.The dynamical behavior of the rotor and the cable is calculated separately in the forth part of the paper. For the rotor,the dynamic frequency is different with the static frequency,and it changes with the rotate speed and the axis stress of the middle axis,that is ,it increases with the rotate speed and decreases with the initial stress of the cable.For the cable,inspired with the rotor,it need to avoid the sympathetic vibration.In addition.The wind vibration factor,related to dynamic frequency ,and becoming more complicated, is calculated and deduced in this paper.Compared with 1.5 in the criterion,a new value is suggested. Furthermore, the Campbell-figure of the cable and the rotor are obtained according the relation of the frequency and the rotary speed,then the resonance vibration points are get, which supplys reference datas for the further design of the VAWT later.There are 45 figures,22 tables,60 referencrs literature in this paper.