Mechanical system model self-updating method and system based on digital twin technology

The invention relates to the field of mechanical system control, in particular to a mechanical system model self-updating method and system based on the digital twin technology, and the method comprises the steps: calculating a sliding mode surface according to the state of a digital twin system and a state vector obtained in a mechanical system, and calculating a sliding mode switching variable and an iteration error estimation variable according to the sliding mode surface; judging whether an error between the digital twin system and the mechanical system is greater than a set requirement or not according to the sliding mode surface; if the error is greater than the set requirement, constructing an overdetermined linear equation set according to an iterative error estimation variable, and calling a pseudo-inverse algorithm to update an internal coefficient target value of the digital twin system; the digital twinborn system calculates a sliding mode switching variable and an iterative error estimation varia