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Zhang C.,Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance | Zhang C.,Civil Aviation University of China | Li Q.,Civil Aviation University of China | Shi X.,Civil Aviation University of China
Soft Computing | Year: 2015

This paper focuses on an uncertain (N, T) block replacement policy with minimal repairs for the aircraft structure under corrosion damage. We consider a kind of structure component which is made by a new developed composite material, and its failure time is considered as an uncertain variable because of the absence of historical data. Given the chance constraint of corrosion maintenance allowance, an uncertain programming model for (N, T) block replacement model with minimal repairs which minimizes the expected cost rate is proposed based on uncertain theory, and the optimal time interval (Formula presented.) and the number (Formula presented.) of preventive repairs can be obtained by an improved branch and bound algorithm. Finally, a numerical example with parameter sensitivity analysis is illustrated to verify the proposed model and algorithm. © 2015 Springer-Verlag Berlin Heidelberg Source

Su J.,Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance | Lu P.,Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance | Wang Z.,Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2013

Two types of Ni-Al alloy coatings were prepared on 45 steel by duel wire spraying process in which NiAl-95/05 alloy wire and NiAl-80/20lux-cored wire were employed separately in order to investigate the effects of spraying materials and techniques on the performance of anti-skid coatings. The microstructure, phase structure and bonding strength of the resultant coatings were were measured. The static friction coefficient of the coatings was measured with inclination method. The environmental resistance of both coatings was studied with NaCl solution bathing. The results show that both coatings were well combined with the base materials and no cracks were observed. The average bonding strength was 68 MPa for NiAl-95/05 coating and 69 MPa for NiAl-80/20 coating. Both coatings performed excellently in corrosion environments. The static friction coefficient of NiAl-95/05 coating was smaller than that of NiAl-80/20 coating. Source

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