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A quantification method for diagnosability of time-varying systems under the influence of bounded disturbances

A technology of time-varying systems and interference effects, applied in general control systems, control/regulation systems, instruments, etc., can solve problems such as not considering or only considering the influence of known distributed noise, and achieve easy implementation, wide application range, sufficient The effect of flexibility

Active Publication Date: 2020-11-20
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

However, the existing quantitative research results of diagnosability based on K-L divergence, Bhattacharyian distance, and directional similarity are all specific research work on linear time-invariant system models, and do not consider or only consider the influence of noise in known distribution forms

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  • A quantification method for diagnosability of time-varying systems under the influence of bounded disturbances
  • A quantification method for diagnosability of time-varying systems under the influence of bounded disturbances
  • A quantification method for diagnosability of time-varying systems under the influence of bounded disturbances

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Embodiment Construction

[0023] The present invention will be further explained and described below in combination with specific embodiments.

[0024] A method for quantifying diagnosability of time-varying systems under the influence of bounded disturbances, comprising the following steps:

[0025] S1. Establish a time-varying equivalent space model of the spacecraft system based on the model standardization processing method and the equivalent space transformation processing method;

[0026] S2. Establish a fault set according to the time-varying equivalent space model of the spacecraft system;

[0027] S3, using the time-varying equivalent space model and the fault set of the spacecraft system to judge whether the fault is detectable according to the first preset condition; if detectable, proceed to S4; otherwise, end;

[0028] S4, using the time-varying equivalent space model of the spacecraft system to calculate the detectability metric value through the Hausdorff distance;

[0029] S5, using t...

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Abstract

The invention discloses a time-varying system diagnosability quantification method under the influence of bounded interference, and belongs to the technical field of space. The method comprises: converting a spacecraft system described by a state space into a time stack dynamic model; converting a diagnosability quantification problem of the system into a full-symmetric polytope similarity calculation problem, giving mathematical definitions of system fault detectability and isolability, and quantifying diagnosability (including detectability and isolability) of the fault through a Hausdorff distance. Compared with an existing method, the method has the advantages that the spacecraft system model is popularized to the time-varying model from the existing time-invariant model, only the boundary of interference needs to be known, the specific form of interference does not need to be defined, actual engineering requirements are better met, and operation and execution of designers are facilitated.

Description

technical field [0001] The invention relates to a method for quantifying the diagnosability of a time-varying system under the influence of bounded interference, which belongs to the field of space technology. Background technique [0002] With the continuous improvement of investment scale and system complexity, more stringent requirements are put forward for the accuracy and speed of autonomous fault diagnosis of spacecraft systems. On the one hand, it directly proposes a diagnostic algorithm with higher performance to meet the specific requirements of fault diagnosis in actual engineering; on the other hand, it fundamentally improves the self-diagnosis capability of spacecraft systems by quantifying the fault diagnosability of the system. [0003] Fault diagnosability is an inherent property of the system itself, and it is an important index to measure the difficulty of fault detection and isolation. Diagnosability mainly includes two parts: detectability and isolateabil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/042
Inventor 王大轶李文博刘文静刘成瑞张香燕李佳宁韩洪波
Owner BEIJING INST OF SPACECRAFT SYST ENG
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