Research On Technology Used In Vibration Isolation System Of Wind Turbines

Wind energy is a renewable natural energy which is rich and clean. Many countriesaround the world have attacked attention to how to exploit it. In2012, China had biggerinstalled capacity than America, ranking first in the world. At the same time, Our countrybecame the biggest country to manufacture wind power equipment. However, wind powerindustry in our country started later and based on weak foundation. The key technologymainly relied on imports. So the work to study technology in wind power industry hadgreat significance. This research focused on technology of wind turbine vibration isolationsystem. It could be divided into four aspects.Firstly, based on rigid body dynamics theory and engineering experience powerequipment vibration isolation calculation software was created using Matlab. Using thesoftware wind turbine vibration isolation system was calculated. The results which wereanalyzed showed that the natural frequencies of system were not in reasonable range,which could cause resonance. Besides, vibration isolation effect of system was poor in thegenerator working speed. So the wind turbine vibration isolation system was supported tobe redesigned.Secondly, through field test, the vibration performance of wind turbine system andvibration isolation effect in three directions were analyzed. The vibration performance wasshown in total values analysis, a third octave analysis, linear spectrum analysis of vibrationacceleration. According to results, vertical and horizontal vibration isolation effect wasgeneral, longitudinal vibration isolation effect was poorer. The vibration isolation effectamong the frequency of6Hz～30.17Hz was quite poor, which validated the resultcalculated in the software.Thirdly, a program was made to calculate overall vibration intensity of a generator.The results were compared with results got by test. The program was proved to be correct.The optimization procedures was developed, while the minimum vibration intensity ofwind generator was as the goal, the natural frequency as constraint. Three schemes wereproposed and compared by power equipment vibration isolation calculation software. Theoptimized stiffness of isolators in three directions were got and the vibration isolationsystem of wind turbine owned better function.Finally, design technology of wind turbine elastic support was studied using finiteelement analysis, in order to meet the performance requirements of wind turbine vibrationisolation system. The method to make model of rubber and steel was found. Coupled modeling techniques and non-linear modeling techniques were also solved. The structuralstrength and stiffness of wind turbine elastic support were analyzed. The structure designtechnology for wind turbine elastic support was developed. Many factors, such as rubberhardness, elastic support taper, rubber layer thickness, hole in rubber and so on, whichinfluent the performance of elastic support were considered, which could provide guidancefor product design.