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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2017, Vol. 38 ›› Issue (12): 421301-421301.doi: 10.7527/S1000-6893.2017.421301

• Material Engineering and Mechanical Manufacturing • Previous Articles     Next Articles

Accuracy analysis for automatical adjustment of aircraft fuselage posture based on SDT and indirect adjustment

ZHU Yongguo1, ZHANG Wenbo1, LIU Chunfeng2, ZHAO Shuang2   

  1. 1. School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China;
    2. AVIC Jiangxi Hongdu Aviation Industry Group Company Ltd., Nanchang 330024, China
  • Received:2017-04-05 Revised:2017-08-21 Online:2017-12-15 Published:2017-08-21
  • Supported by:
    National Natural Science Foundation of China (51565042); Focus on Research and Development Plans in Jiangxi Province (20161BBE53005, 20171BBE50007)

Abstract: 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.

Key words: aircraft, assembly, fuselage, Small Displacement Torsor (SDT), indirect adjustment, error transfer, error coupling

CLC Number: