Computer aided analysis for connection precision of spacecraft section

Connection precision verification and assembly datum changing will lead to iterative calculation of connection precision in spacecraft section. Therefore, connection structure and end face deviation of spacecraft section were analyzed. Then, extremum method, root-mean-square method and normal distribution method were used to calculate the synthesis deviation, relative deviation and offset along three directions of torsion, miss-shifted and bending. According to semantic analysis of spacecraft section, the spacecraft section, joint face model and variation ontology were constructed based on Web Ontology Language (OWL); storage and inference calculation of deviation data were performed based on ontology example. Rapid verification and result data output of connection precision were realized. It provided supplementary tools for repeated design and optimization of connection precision in spacecraft section. Finally precision analysis system for spacecraft section was introduced and its practicability was proved by example.