Response Analysis and Optimization of a Lightweight Seat Ring under Airborne Landing Impact

In order to meet the high lightweight and transmission accuracy requirements of a certain airborne system, the seat ring bearing adopts a lightweight material 4-point contact ball slewing bearing. However, the non-linear contact of a large number of balls during the working process of the seat ring makes simulation difficult, and ball damage often occurs in previous experiments. Based on the bearing capacity of the shaft, the influence of uneven load transmission of the ball on the response was considered. The response of the bearing under shooting and airdrop landing impact loads was calculated and analyzed using multi rigid body and finite element methods, respectively. The results indicate that under the impact load, the stress on the ball has exceeded the yield limit of the material, resulting in irreversible plastic deformation. The plastic deformation morphology is basically consistent with the damage morphology of the test ball, which verifies the accuracy of the simulation model. In response to the issue of insufficient ball strength, the seat ring and ball were optimized and designed. After improvement, the structural stress level was significantly reduced and remained within the elastic range of the material, indicating the effectiveness of the optimization and improvement measures.