SQP (sequence quadratic program) based allocation method for avionics system failure detection rate

Abstract

The invention discloses an SQP (sequence quadratic program) based allocation method for avionics system failure detection rate. The method mainly solves the problems of low failure diagnosis efficiency, long failure recovery time, high test cost and the like caused by unreasonable allocation of failure detection rate indexes in the upgrading and refitting process of an airborne avionics system. The method comprises the following implementation process: firstly, performing structure level dividing on an upgraded and refitted avionics system, and defining the level of testability allocation; secondly, analyzing various factors affecting the testability allocation, solving influence coefficients of the various factors, and obtaining constraint conditions so as to build a model of the avionicssystem failure detection rate allocation problem; finally, performing optimization allocation on failure detection rate indexes of the avionics system with an SQP method. Compared with traditional methods of experience distribution, distribution based on failure rate, weighted distribution and the like, the method has the advantages that the influence of personal subjective factors in the actualtestability distribution of the project is reduced, so that the distribution process is more reasonable and efficient.

Description

technical field [0001] The invention belongs to the field of testable design of avionics systems, and in particular relates to an SQP-based method for allocating fault detection rates of avionics systems. In particular, it relates to a fault detection rate allocation method for upgrading and modifying avionics systems. Background technique [0002] Testability index allocation (abbreviation: testability allocation) means that in the system scheme demonstration stage and the preliminary design stage, the testability quantitative requirements of the system are assigned step by step according to the system level according to the given principles and methods For each component of the system, the purpose is to clarify the testability and quantitative requirements of each component of the system, as the basis for testability design (references: [1], [2], [3]). [0003] With the rapid development of aviation technology, it is often necessary to upgrade and modify the avionics syst...

AI Technical Summary

Problems solved by technology

Upgrading and refitting the civil aircraft avionics system will change the structure and signal cross-linking relationship of the original system, which means secondary design and manufacture of the avionics system. The original testability indicators (fault detection rate, fault isolation rate, etc.) will no longer be applicable to the upgraded system. In the traditional system development process, there is no or little consideration of factors such as later fault diagnosis. When using a modern avionics system with a high degree of modernization and high technical complexity, there are problems such as low fault detection rate and high cost of test resources. In order to ensure the flight safety of the aircraft and meet the airworthiness requirements of the aircraft, it is necessary to redo How to allocate testable indicators is one of the important issues that must be solved in testable design. At the same time, a reasonable testable indicator allocation scheme can improve the efficiency of fault diagnosis and isolation of avionics systems and reduce the cost of testing , Troubleshooting and maintenance costs, and reducing test time have important theoretical significance and practical value

[0004] At present, there are very few domestic and foreign scholars who have studied the fault detection rate allocation method for upgrading and refitting avionics systems. The fault rate allocation method used in traditional systems has a large influence of personal subjective factors, low allocation efficiency, and unreasonable results. Therefore, the traditional method cannot be used to allocate the fault detection rate of the avionics system. In this context, it is necessary to develop an SQP-based fault detection rate allocation method for the avionics system, which is suitable for the upgraded system

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