Aircraft structure checking task planning method based on risk and cost analysis

A technology for aircraft structure and cost analysis, applied in data processing applications, predictions, calculations, etc., can solve problems such as rising false alarm events, increasing maintenance costs and operating costs, shutdown inspection activities, etc.

Inactive Publication Date: 2017-01-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, compared with the traditional inspection method based on non-destructive testing equipment (NDE), the introduction of SHM technology can implement more frequent autonomous inspections. However, a new problem brought about by frequent implementation of SHM inspections is that it may lead to an increase in false alarms. Cause unnecessary downtime for inspection activities, adding additional maintenance and operating costs

Method used

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  • Aircraft structure checking task planning method based on risk and cost analysis
  • Aircraft structure checking task planning method based on risk and cost analysis
  • Aircraft structure checking task planning method based on risk and cost analysis

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Embodiment

[0057] The embodiments described here are only used to explain and illustrate the present invention, not to limit the present invention.

[0058] This embodiment takes typical modern civil aircraft structural planning and maintenance task planning as an example, figure 1 It represents a typical contemporary civil aircraft structure maintenance plan, in which the first inspection time is set at 12000FC, and the repeated inspection interval is 3000FC. In the analysis of the embodiment, it is assumed that there is a fleet of 1,000 aircraft, and the design service life of the aircraft structure is 60,000 cycles. Assume that the cost of an NDE inspection of structural parts in base maintenance is $1000, the cost of inspection using the online SHM system is $50, the cost of structural repairs in base regular inspections is $2000, and the cost of unplanned repairs on the route is $10000.

[0059] image 3 It represents the single-flight failure risk (SFPOF) and each The change cur...

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Abstract

The invention discloses an aircraft structure checking task planning method based on risk and cost analysis. The checking mode comprises traditional structure non-destructive detection and structure health monitoring. The method comprises the steps that based on the principle of probability damage tolerance analysis, the calculation model of single flight failure probability of an aircraft structure element is established; based on the model, a cumulative risk calculation model of a fleet in a certain period of time is established; in the existing aircraft structure plan maintenance mode, the maintenance cost calculation model of the aircraft structure element in the service life cycle is established, wherein the calculation model comprises structure checking cost, repair cost and false alarm cost; the single flight failure risk and fleet cumulative risk are used as the risk assessment indicators of a structure maintenance policy; under the premise that a safety risk requirement is satisfied, the optimal structure checking policy can be determined according to the analysis of the structure whole service life cycle maintenance cost. The optimal structure checking interval and repair threshold can be determined based on the tradeoff between the structure failure risk and the service life cycle maintenance cost.

Description

technical field [0001] The invention belongs to the technical field of aircraft structure maintenance task design and planning, and relates to a method for formulating an aircraft structure maintenance task plan based on risk and cost analysis, in particular to the periodic non-destructive inspection (NDT) of aircraft fatigue damage tolerance structures or the regular structural health monitoring interval Confirm and optimize. Background technique [0002] There are many kinds of aircraft structure maintenance strategies, preventive maintenance, after-event maintenance, etc. are all one of the maintenance strategies. Preventive maintenance is maintenance performed at pre-determined intervals or according to relevant specified standard times, with the aim of reducing the probability of failure of structural components. The complete set of life-cycle preventive maintenance tasks is called a scheduled maintenance plan and is usually determined during the design and manufacture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04
CPCG06Q10/04
Inventor 孙见忠陈丹李超役闫洪胜左洪福
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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