Transactions of Nanjing University of Aeronautics & Astronautics
Analysis of Effective Working Hours of Automatic Assembly Equipment for Aircraft Assembly Stations
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Abstract:
To improve the accuracy of capacity analysis and prediction for the aircraft assembly stations， an approach for calculating the effective working hour （EWH） of automatic assembly equipment is introduced by using the dynamic mixed Weibull distribution （DMWD） model. Firstly， according to the features of aircraft assembling， a DMWD model considering the dynamic reliability of multiple subsystems and their synthetic effects on the whole equipment is established. A typical automatic drilling & riveting machine is selected as the research object， and the dynamic weights of reliability of three subsystems are modeled and solved. Subsequently the unknown parameters of the DMWD model are estimated based on maximum likelihood estimation （MLE） and Newton-Raphson method. Finally， the EWH of an automatic station is defined and modeled by using the solved dynamic reliability function. Based on the experimental study on a real automatic drilling & riveting machine from a wing panel assembly station， it is shown that the proposed DMWD and EWH models could effectively calculate the equipment reliability with full consideration of its multiple subsystems. The DMWD model is more suitable for improving the solution precision of EWH than the traditional three-parameter Weibull distribution.
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V240.2
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