Method for determining importance degree of components of satellite control system

A technology of satellite control system and determination method, which is applied in the field of aerospace, can solve the problems of large uncertainty and arbitrariness of identification results, and quantitative analysis of parts that cannot be analyzed, so as to reduce redundant backup, reduce system weight and power consumption, and index Physically defined effects

Active Publication Date: 2012-11-21
BEIJING INST OF CONTROL ENG
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Problems solved by technology

The above methods generally can only give single-point faults, but cannot quantitatively analyze the importan

Method used

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  • Method for determining importance degree of components of satellite control system
  • Method for determining importance degree of components of satellite control system
  • Method for determining importance degree of components of satellite control system

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Embodiment approach

[0038] Construct the function tree of the satellite control system. The root of the function tree is the general function of the satellite control system. The general function includes three functions: attitude control, orbit control and sailboard control. Each function is divided into three parts: measurement function, controller and actuator. Each sub-function can be further divided into lower-level sub-functions according to different implementation methods. The sub-functions serve as the trunk of the function tree, and the components that realize the sub-functions serve as the leaves of the function tree. The implementation method is to connect with the gate or the gate;

[0039] The specific construction steps of the satellite control system function tree are as follows:

[0040] ①Aiming at the problem to be analyzed, select the total function (tree root) of the function tree. When analyzing all the functions of the satellite control system, the root of the function tree...

Embodiment

[0075] The present invention is described in detail by taking the attitude control function of a typical high-orbit satellite when jet control is used in orbit as an example. In engineering practice, the satellite control system has a variety of components, so the function tree is also relatively complex. In order to illustrate the simplicity of the specific implementation, the composition of the satellite control system is simplified here, and the composition is as follows:

[0076] ① 2-way earth sensor (ES master and ES backup): under normal circumstances, one ES works, and the other cold backup. If necessary, two ESs can also work at the same time.

[0077] ② 4-way sun sensor (SS): including pitch SS master, roll SS master, pitch SS backup, roll SS backup. The pitch SS master and pitch SS backup are mutually active and backup, and the rolling SS master and rolling SS backup are mutually active and backup.

[0078] ③Propulsion system: The propulsion system includes multiple...

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Abstract

The invention provides a method for determining importance degree of components of a satellite control system. The method includes: (1) a satellite control system function tree is established, and different levels of the function tree are connected through a conjunction gate or a disjunction gate according to function realization ways of the satellite control system; (2) a cut set family C of the function tree is determined by adopting a descending method or an ascending method according to the conjunction or disjunction relationship among the different levels of the function tree, elements in the cut set family are cut sets, and the cut sets are sets of components for achieving functions of the satellite control system; (3) absorption processing is performed on the cut set family C determined in the step (2), a minimum cut set family (Cmin) of the function tree is obtained, elements in the minimum cut set family (Cmin) are minimum cut sets cmin, and the minimum cut sets cmin are sets of minimum components required for achieving the functions of the satellite control system; and (4) the importance degree of each component in the function tree is determined. The method overcomes the defect that a failure mode and effects analysis (FMEA) technique can only show single point failure and can provide a basis for design of reliability and reconfigurability of a satellite.

Description

technical field [0001] The invention belongs to the field of aerospace and relates to a method for calculating the importance degree of satellite components based on the minimum cut set analysis of a function tree. Background technique [0002] With the development of science and technology, satellites have played an irreplaceable role in various fields such as national defense, military, communications, and meteorology. In order to ensure the safety and operation quality of satellites in orbit, it is necessary to identify important components, and to ensure that the on-orbit failure rate of important components is reduced as much as possible by strengthening the reliability design, hardware redundancy or functional redundancy design of important components, or In the event of a failure, it can realize switching or system reconstruction, and minimize the impact of the failure. [0003] At present, in the process of satellite development, the importance of components is main...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 刘成瑞王南华何英姿王大轶
Owner BEIJING INST OF CONTROL ENG
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