Abstract
High-efficiency posture prealignment for large components is an important application in aircraft manufacturing. In this article, a new prealignment method for large components via indoor global positioning and laser ranging is proposed. Based on the smart automated guided vehicle (AGV) system, the component is transported from the previous processing station to the assembly station under the guidance of an indoor global positioning system (iGPS), and a predictive correction algorithm is proposed to solve the potential drift problem. The subsequent close-range prealignment is achieved with the proposed laser alignment method, and to improve the accuracy, the estimation of posture error is presented in detail, along with the layout optimization of laser displacement sensors (LDSs). The analysis indicates that the symmetric form with two LDSs on each edge is the most desirable layout. A prototype system is developed, and the verification experiment shows that the posture error is no more than 0.3 mm in translation and 0.02° in orientation. Besides the outstanding performance in precision and efficiency, it possesses great repeatability and applicability.
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