| Diaphragm coupling is the key component to connect the speed-increasing box with the generator.The misalignment fault occurs,which causes the eccentricity of the coupling,the gear of the speed-increasing box,the bearing and the bearing of the generator,and at the same time causes the noise of the unit to increase and the stability of the unit to decrease.Therefore,theoretical analysis,software simulation and experimental verification of early non-intermediate latent faults at the output end of the speed-increasing box of wind turbines are of great practical significance to ensure long-term stable operation and safe generation of power.Based on the National Natural Science Foundation of China "Research on Dynamic Modeling and Fault Diagnosis Method for High Speed Bearing of Large Wind Turbine"(Project Approval No.51865045),this paper takes high speed end diaphragm coupling of wind turbine as the research object,carries out dynamic modeling analysis and experimental verification for high speed end misalignment fault,and explores the law of response characteristics.The main research contents include:(1)Theoretical analysis of diaphragm coupling.Firstly,the static analysis of the parallel/angle misalignment fault of diaphragm coupling is carried out.Then,the motion coordinate system is established for parallel and angle misalignment.The energy equation is deduced by establishing velocity constraint equation through coordinates.The theoretical model of misalignment dynamics is simplified by using Lagrange energy equation,and solved numerically by using MATLAB and Runge-Kutta method of order 4-5.Finally,the misalignment is analyzed.The response characteristics of the system under the change of degree and dimensionless speed parameters are compared and analyzed.(2)Software simulation of high-speed end diaphragm coupling of wind turbine drive system.Based on SolidWorks,the component CAD modeling and assembly of the transmission system of wind turbine are carried out.Then using Adams software to set materials for each part of the transmission system,add constraints according to the movement law,parametric modeling,and establish the motion function.By changing the coupling misalignment simulation analysis,the parallel/angle/comprehensive simulation image is obtained and the time-frequency parameters are analyzed.(3)Verification of misalignment test of coupling.The coupling-rotor test bench was built,and the parallel misalignment test scheme was formulated.The vibration signals of the bearing seat and generator were collected under 10 sets of working speed conditions under various fixed misalignment conditions.At the same time,the time domain index and frequency doubling characteristics of the signals were analyzed,which verified the validity of theoretical analysis and Adams simulation. |
