Failure Mechanism Analysis and Simulation Verification of an Unidirectional Transmission Mechanism

Unidirectional transmission mechanism (UTM) is widely used in mechanical field. The UTM studied in this paper is the core component of the aircraft hatch system, which is used to transfer the power of the motor to drive the hatch to be retracted and locked automatically after the motor closes. Aiming at the failure mode exposed in the experiment, the matching relations of both geometric parameters and mechanical parameters are studied, and the force analysis model of the UTM is established. The results show that the load of the UTM reaches its maximum at 65°, and if the friction coefficient between the friction plates is less than its critical value, braking failure will occur, which is in agreement with the test phenomena. In order to further verify the failure mechanism and obtain the effects of the gradual damage on the performance, a parameterized simulation model is established, through which failure phenomenon in the test is recovered, and the correctness of the failure mechanism analysis is verified. Finally, combined with its failure mechanism, the maintenance advice is proposed, and the validity is verified through the simulation model.