A rotary platform is studied.The control method of its electromechanical transmission system is studied by usingvirtual prototype technology and control theory.Virtual prototype model of rotary platformis established in RecurDyn/Gear based on the Hertz elastic contact theory.A feed-forward link and three-ring control systemwhich are position

speed and current control link are designed in Colink.And then

the mechanical and control simulation model is setup.The response of the typical position command signal is analyzed.The simulation results show that the control method has effective engineering application

and the method can satisfy the objective of engineering control and a reference for the design and analysis of other electromechanical transmission control system is provided.