Multi-objective Optimization Design And Simulation Analysis Of The Wind Turbine

As one of the important parts of wind turbine,gearbox is a device of gears transmission which is set up at high altitude and bears low speed,heavy and variable wind load during a long time.Its work environment and characteristics which often make it break down in the process.With the development of society,the contradiction between the increase of installed capacity and lightweight has attracted more attention and people have the high request about the design,manufacture,reliability and power of the gearbox.Hence,the optimization design and dynamic analysis of the gearbox have a great of significance to improve the reliability of gearbox and develop the technology of the wind power.(1)According to the design requirements and work characteristics of wind turbine,reasonably consider the balance between lightweight and high-power density of gearbox.The paper studies the optimization of gearbox with two planet gears pairs and the helical gears of one parallel shaft.It establishes a multi-objective optimization model which takes the modification coefficient,interference of the transition curve and assembly condition of gears as the constraints.The design model pursuits the goal of the minimum volume and the maximum power density.(2)Solving the design model which use the weighted coefficient,and then the design model is performed using Matlab.On this basis,a case study is calculated and analyzed.Under the condition of ensuring the strength of each component and the normal operation of the gearbox,the volume of the gearbox is decreased,and the manufacturing and installation cost is reduced.The results show that the power density is increased,especially the low-speed stage whose power density is improved more;the total volume of the gearbox is reduced after optimization.It is important for the lightweight design of high-power gearbox.(3)In consideration of the meshing damping,meshing impact and output load of gearbox,using Pro/E and Adams co-simulation set up the model of the gearbox for simulation and analysis,and model was also tested correctly;According to the simulation,solve the gear meshing impact and analyze the meshing impact force of time-frequency characteristic.It provides good reference value for the study of the vibration and trouble-shooting of gearbox.(4)It is defined the load condition that the input speed is 17.4r/min(the input torque is 8.23×10~5 N·m),the load torque is 6.03×103 N?m and the gravity.The fatiguelife of gearbox is obtained and analyzed by using RomaxDesigner.On this foundation,the paper studies the effect of gear mesh misalignment on the gearbox.The shaft-sections which generate suddenly stress also have the necessary improvement,while the strength of the gear shaft are checked.Using RomaxDesigner and the optimization analysis can improve the efficiency and quality of the design greatly.(5)When the deflection scaling factor is 1,the mode shapes of shafts and natural frequency are analyzed.Using Ansys workbench to calculate the mode shapes of the wind turbine under the pre-stress.The harmonic response curves of gears meshing are studied.The results reveal that the gearbox may cause resonances and appear the noise during the segment of the medium and high frequencies under the excitation frequency.