A maintenance decision-making method for aircraft bleed air pressure regulating valve

Abstract

The invention discloses a maintenance decision-making method for an aircraft bleed air pressure regulating valve. The method comprises: step 1, initializing parameters; step 2, counting the use history of each component, and analyzing a reliability sample; step 3, analyzing a function relationship among various maintenance costs of the aircraft bleed air pressure regulating valve; step 4, evaluating the reliability distribution of the aircraft bleed air pressure adjusting valve; step 5, calculating the maintenance cost rate and availability of the aircraft; step 6, establishing a multi-objective planning model; step 7, converting the multi-objective planning model into an unconstrained optimization problem; step 8, carrying out iterative solution on the unconstrained optimization problem;step 9, judging whether the iterative computation meets an end condition or not, if so, turning to step 12, and otherwise, turning to step 10; step 10, updating a Lagrangian multiplier penalty factor;step 11, updating the multiplier parameters, and turning to step 8; and step 12, analyzing the rationality of the maintenance decision of the aircraft bleed air pressure regulating valve.

Description

technical field [0001] The invention relates to a maintenance decision-making method for an aircraft bleed air pressure regulating valve, which belongs to the interdisciplinary application of maintenance engineering, computer-aided decision-making, optimization methods and the like. Background technique [0002] The function of the aircraft air supply system is to provide air with suitable pressure and temperature to the air conditioning system according to the needs of each system of the aircraft. One of the key components of the air source system is the bleed air pressure regulating valve installed on the engine case, which can adjust and shut off the bleed air. Although the bleed air pressure regulating valve is very important to the safe flight of the aircraft, in fact, it is also one of the components with the highest failure frequency in the aircraft. Faults such as air leakage in the signal tube, low bleed air pressure or no bleed air often occur, especially some fau...

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Problems solved by technology

However, the Nelder-Mead simplex method actually has many defects. For example, in 1998, McKilmon used multiple negative examples to prove that the Nelder-Mead simplex method cannot converge in some cases

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