Throttling ring wear diagnosis method based on fluid-solid coupling analysis

The invention provides a throttling ring wear fault diagnosis method based on fluid-structure interaction. The method comprises the following steps: establishing a fluid-structure interaction fault diagnosis model for a backseat device by using AMESim system simulation software; implanting a fault into the fluid-solid coupling fault diagnosis model of the recoil device, and simulating an influence rule of the fault on characteristic index parameters; analyzing an influence rule of the fault on the characteristic index to obtain a fault diagnosis index; based on the influence rule of the fault on the characteristic index parameter and the fault diagnosis index, obtaining a diagnosis index and an index parameter expression of the abrasion fault diagnosis of the throttling ring of the anti-recoil device; then calculating a pulse index Cf of the pressure; and substituting the calculated pulse index into a diagnostic index formula for reflecting the abrasion of the throttling ring of the anti-recoil device to obta