Research On Performance Analysis And Engineering Application Technology In MW Level Wind Turbine Gearbox

With people's increasing quality of green low-carbon life,higher requirements have been put forward for the technical development and innovation of many renewable energies such as wind power generation,hydroelectric power and photovoltaic power generation.Currently,wind turbines have turned into higher-yielding renewable energy sources.The Doubly-fed wind generator with speed increasing box gets very large installed capacity,and it has many advantages,such as high transmission efficiency,convenient maintenance,low cost of wind turbine,etc..However,due to the extremely bad external environment of the wind turbine and the instability of the load,the gear transmission part of the wind turbine is facing a very high challenge.How to improve the gear of wind generator capacity,improve NVH performance and improve the gearbox of wind turbine gearbox structure strength is an important research direction of the wind turbine,at the same time,it also play a very important research significance in the engineering application technology of the wind turbine gearbox.In this paper,the theoretical calculation method of gear meshing load distribution is first deduced that the meshing misalignment is the key factor that affects the effective contact length when gear meshing.In order to reduce the meshing misalignment in gear meshing,the micro modification of gear is the best solution.A single tooth or tooth profile modification has been difficult to meet the good working condition of the gear box,so the full consideration of the key elements of mesh misalignment,tooth contact deformation and meshing impact,analyzes the calculation method of tooth profile modification technology and profile modification technology,for the follow-up based on the Romax software for wind power gear box the micro modification lays a solid theoretical foundationThe modification parameters of the micro-gear modification directly affect the performance and efficiency of the entire transmission system of the wind turbine.In this paper,the rigid flexible coupling model of 2MW wind turbine gearbox is established according to the relevant parameters in Romax Designer software,and the best micro modification data is obtained through the multiple modification experiments combined with the micro modification theory of gear.The effect of gear micro-shape modification on transmission error,tooth contact strength and tooth surface bearing capacity was analyzed.The dynamic performance of the corresponding nodes of the wind turbine gearbox is studied in detail by simulating the measured position in the actual bench test.Finally,the ultimate strength and fatigue strength of a planet carrier with maximum capacity for wind turbine gearbox bearing external loads are analyzed.When the strength of planet carrier is checked,the existence of interference fit between pin shaft and planet frame is fully considered.The method of loading is applied in reverse direction,and the fatigue strength analysis of planet carrier is carried out by using multiple operating steps analysis methodThe results show that the microscopic modification of the gearbox greatly reduces the gearbox transmission error,the gear tooth load capacity and the contact strength of the tooth surface are optimized,and the dynamic performance of the gearbox is improved,further analysis of the wind power gear box planet carrier ultimate strength and fatigue strength.It has been found that the gearbox meets the design requirements for 20 years.