Gear Box analysis

hi all,

I am doing the FEA on gear box of wind turbine, which is a very complex system.

I want to carry out  static and dynamic analysis. I want to consider all the gears in this analysis.

If anyone is having experience in the gearbox analysis, please help me. how to simplify this complex system.

If anyone is having any reference documents please forward to me.

thanks

regards

sagar