Modeling method of moment-limited hydraulic coupler-driven complex mechanical system

The invention relates to a modeling method related to a hydraulic coupler in a mechanical engineering field, in particular to a modeling method for a torque limited hydraulic coupler to drive a complex mechanical system. The modeling method for the torque limited hydraulic coupler to driving drive the complex mechanical system separates the mechanical system into two independent parts for the respective modeling and respectively treats a pump wheel and a turbine wheel of the hydraulic coupler. One independent part is that a motor is connected with the pump wheel of the hydraulic coupler and the other independent part is that the turbine wheel of the hydraulic coupler is connected with the mechanical system. Respective motion equations are constructed separately and motion amounts in the mechanical system are calculated according to the two equations. The modeling method of the invention avoids errors which are brought from a traditional direct excitation of an original characteristic curve on the mechanical s