This paper discusses the mechanism for adjusting aircraft fuselage with four positioners. A calculation method is proposed to analyze dynamic posture-adjusting accuracy of aircraft parts. The Small Displacement Torsor (SDT) is used to model the critical tolerances of the positioner, and the SDT model of four level errors is established for the positioner. An explicit function relationship between manufacturing errors and fuselage's posture error is built based on differential transform method, and the transfer and accumulation coefficient matrices of manufacturing errors are also derived. A mathematical model for dynamic error transfer of a single positioner is established using the five-order polynomial trajectory planning method. Then, to overcome error coupling of multi-positioner, a method for calculating dynamic error coupling of multi-positioner spherical centers is proposed by using indirect adjustment method and weighted least square method, and the expression for error compensation is also derived. The test data show that position and pose errors can be reduced, and posture-adjusting accuracy can be improved with driving compensation according to the proposed method, which can thus provide an effective way to ensure assemble coordination accuracy of large components.
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