Coordination analysis of aircraft composite inlet as- sembly based on measurement model

The core issue in assembling composite aircraft intake duct structures lies in analyzing and con-trolling the assembly gaps between components. To address this problem, this paper proposes a simulation analysis method for composite intake duct structure assembly gaps driven by actual measurement models. An array of support units maintains the product structure's shape, reducing geometric deformation in the exact measurement point cloud. Additionally, a multi-objective pro-gressive iterative NURBS surface reconstruction model is established to enhance the reconstruc-tion accuracy of geometric features, considering global accuracy, local accuracy, and smoothness. Based on the point cloud registration model, a pose adjustment target model with coplanar engi-neering constraints is introduced to solve the pose adjustment's rotation and translation parame-ters, thereby improving positioning accuracy. Finally, simulation experiments on composite in-take manifold assembly gaps showed that the proposed method reduced the gap from 0.5 mm to 0.2 mm compared to the traditional method, effectively improving assembly quality.