Simulation Study On Dynamics And Fault Diagnosis Of Digital Twin In Planetary Gearbox

The planetary gear system of wind turbine is an indispensable part of mechanical transmission of wind power system.Because the wind power planetary gear system is installed inside the head of the wind tower which is tens of meters or even hundreds of meters high,it is in the working environment of high speed variable load,great natural temperature difference and no supervision for a long time,and the failure rate is very high and the life cycle is short,but the operation and maintenance personnel can not grasp the running state and the failure situation in time and accurately.Therefore,in this paper,the digital twin model of fault diagnosis corresponding to wind power gear system is established according to the characteristics of digital twin technology.The model can solve the problem of gear system in the service,meet various complex wind conditions to the physical entity of the accurate state of the synchronous evolution,ensure the implementation of remote monitoring of the state of wind turbine gear unit and failure caused by the pre-judgment.The wind power gear transmission system is a three-stage planetary gear box structure,and the wind energy of the driving mechanism is huge,which can not be simulated under the test conditions.For this reason,this paper takes the first class wind turbine planetary gearbox test bench in the laboratory as the research object,uses 2.5 kw motor as the power source of the gearbox,simulates instead of the wind turbine blade and the front-end power input part,and uses the magnetic powder brake as the output load of the gearbox.Combined with digital twin technology,the digital twin model of gear box fault diagnosis is established,and then its fault mechanism is analyzed,and then the correctness of gear digital twin model is verified by comparing the kinematics and dynamics results of theoretical data,experimental data and simulation results.The main tasks are as follows:(1)The tooth profile of the tooth-bearing member is depicted by means of parameter point-driven method,and a three-dimensional model is established in the Solid Works which matches the object's physical height.the digital model is verified by the interference inspection of the assembly model.(2)In the ANSYS software,the transient dynamic analysis of the normal and fault conditions of the planetary gear box is carried out,and the stress distribution at the contact surface of the meshing gear is analyzed.(3)The planetary gear box transmission system is introduced into the ADAMS dynamics simulation software to simulate the normal and fault conditions dynamics models respectively.Through the continuous modification of the simulation boundary conditions,the influence of damping factors on equipment operation is considered synthetically.And the simulation results are compared with the theoretical values to verify the accuracy of the twin model.(4)Vibration testing of planetary gearboxes using test platforms.The vibration data collected by the experiment are compared with the simulation data,and the simulation model can highly simulate the running state of the real equipment.