| The international concern over climate change is driving many governments toreducing carbon-dioxide emissions by means of political and regulatory pressure andto actively trying to increase the percentage share of the total electrical supplyenergy from renewable sources. Meanwhile wind power industry has experiencedquick growth, as one of the most expensive components of the wind turbine system，has been plagued by wind power industry, has experienced higher-than-expectedfailure rates. Gear damage accounted for the highest proportion of common fault ofwind power gearbox, fatigue broken teeth accounted for the highest proportion of intooth damage and the second is the surface contact fatigue. Contact fatigue lifestudying of wind turbine speed-increase gearbox is beneficial to improve thereliability of gear on wind power growth gearbox and reduce the cost of the productdesign stage.This topic is supported by the national science and technology supportedproject "7mw wind power gear box and the spindle bearings industrialization keytechnology research and development" and Science and technology research projectsof Chongqing City Board of Education "study on gear contact fatigue life underrandom loading",respectively analysis and simulate tooth contact fatigue life ofwind turbine speed-increase gearbox under random load by analytical method andfinite simulation element method.(1) The time series of the main shaft torque on the five typical workingconditions is simulated and calculated. History of random load history is counted.(2) According to the level of planetary gear system dynamics model,considering time-varying meshing stiffness， gear integrated error and thetime-variant stiffness of bearing, the simulation analysis of the gear dynamicmeshing force, speed, acceleration, and the influence of random errors on thedynamic meshing force, and the crack initiation life and crack propagation life.arepredicted, random error is studied, the effect of residual stress and friction coefficienton the initiation life and crack propagation life.(3) The initial crack in spur gear model is analyzed by analytical method andcalculate the equivalent stress intensity factor of the crack front.The crackpropagation path is simulated.we study the effects of the load on the equivalent stress intensity factors.(4) The whole3D solid model of the first level of planetary gear system onwind turbine speed-increase gearbox is built in UG. All stress of first level ofplanetary gear system is calculated in Abaqus. Contact fatigue life of gear pair iscalculated in Fe-safe, and study the influence of random load distributionparameters on the contact fatigue life. |
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