Dynamic Performance Analysis And Gear Modification Research Of Multistage Planetary Gears In Wind Power Speed-up Gearbox

In recent years,the wind power industry has developed rapidly.The wind power speedup box is a key component in the wind power system.Its transmission performance is directly related to the reliable operation of the wind power system.Gear modification is an important technology to improve the performance of gear transmission,taking the modified speed box gear can run efficiently and have more stability,and prolong the service life.In this paper,model establishment and dynamic performance simulation analysis were carried out for wind turbine growth box.Based on the simulation analysis results of tooth surface load distribution,transmission error and so on,a multi-objective comprehensive modification scheme was determined to reduce the peak of gear transmission error and the maximum load per unit length of tooth surface,and the modification optimization analysis was carried out for all levels of gear.Finally,based on the simulation data of gear modification parameters and node vibration acceleration,the prediction model between gear modification parameters and node vibration acceleration was established,and the vibration size of gear under different combination of modification parameters was accurately predicted.The main work of the paper is summarized as follows:(1)In order to solve the problems of large vibration and impact of the wind power booster box,concentrated load and stress on the tooth surface,etc.Based on professional gear modeling and simulation software,a dynamic simulation model of the wind power booster box is established.Firstly,the components such as shafting,gears,bearings,etc.were modeled and installed.Secondly,the values for each working condition were defined in the load spectrum.Finally,the contact and bending safety strengths of the gears were checked,providing a model basis for subsequent research.(2)The vibration mechanism of gears is discussed,and the dynamic performance of the model is analyzed based on the software platform.The transmission error(TE),maximum load per unit length of tooth surface,and vibration acceleration of nodes are analyzed for each level of gear transmission,providing data basis for subsequent gear modification optimization.(3)Based on the simulation and analysis results of tooth surface load distribution and transmission error,combined with the advantages of tooth alignment modification and tooth profile modification,a comprehensive gear modification method is proposed that takes into account both reducing transmission error and improving concentrated load on the tooth surface.All levels of gears have been modified,and the modification effect has been verified by simulation analysis.(4)A PLSR model for predicting nodal vibration acceleration is established.Firstly,based on the calculated gear modification range,the optimal Latin hypercube sampling is performed to obtain a combination of 250 gear modification schemes.Secondly,each modification scheme is modified,and after the modification,the dynamic performance of the transmission system is analyzed to obtain the maximum vibration value at the node.Finally,the mapping relationship between the modification parameters and the maximum vibration of the node is explored,and a prediction model between the modification parameters and the vibration acceleration of the node is obtained.