Molecular dynamics model-based rotating part friction force calculation method

The invention discloses a rotating part friction force calculation method based on a molecular dynamics model, and relates to the technical field of molecular dynamics, and the method comprises the following steps: constructing a pressure head model and a matrix model, sleeving the matrix model outside the pressure head model, the pressure head model being used for simulating a journal in a rotating part, the base body model is used for simulating a bearing hole in a rotating part, and the axes of the pressure head model and the base body model coincide with the Y axis; rotating the matrix model around an X axis by a set angle to simulate an initial state that a journal axis is not overlapped with a pressure head axis; the pressure head model is moved downwards by a set distance along the Z axis; and applying sinusoidal vibration in the X direction and the Z direction to the moved pressure head model under the micro-regular ensemble, simultaneously applying constant-speed rotating motion around the Y axis, an