Helicopter main reducer transmission system nonlinear dynamics modeling method

The invention discloses a nonlinear dynamic modeling method for a helicopter main speed reducer transmission system. The method comprises the following steps: (1) establishing a helicopter main speed reducer transmission system model; (2) establishing a bearing dynamic model, and calculating a bearing force; (3) establishing a relative displacement equation on a meshing line of each gear pair of the system; (4) establishing a sliding friction force model of a system meshing pair; (5) establishing a nonlinear dynamic equation set of the transmission system of the main speed reducer of the helicopter; (6) reasonable parameters are selected to solve the nonlinear dynamic equation set of the system, and nonlinear dynamic response characteristics of the system are obtained; the method has the beneficial effects that the nonlinear dynamic response characteristics of the helicopter main reducing gear transmission system are disclosed, and the related technical blank of nonlinear dynamic modeling of the current helic