Method for determining fault diagnosability of momentum wheel based on relevance model

A correlation model, determination method technology, applied in the aerospace field, can solve problems such as lack of fault diagnosis performance

Active Publication Date: 2012-10-17
BEIJING INST OF CONTROL ENG
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Problems solved by technology

[0003] The information used by the momentum wheel for fault diagnosis mainly includes shaft temperature, motor current, speed direction, speed signal and power switch status, but there is still a lack of a mature theory and method to assist designers in analyzing whether these measurement points are sufficient, whether Capable of representing all failure modes considered, enabling accurate fault location
At the same time, there is also a lack of a quantitative fault diagnosability index for measuring the fault diagnosis performance of the momentum wheel. Therefore, the present invention proposes a method for determining the fault diagnosability based on the correlation model based on the correlation diagram of the momentum wheel. , realize the detectability and separability discrimination of the failure mode of the functional module, and give the calculation method of the diagnosability measure of the momentum wheel

Method used

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  • Method for determining fault diagnosability of momentum wheel based on relevance model
  • Method for determining fault diagnosability of momentum wheel based on relevance model
  • Method for determining fault diagnosability of momentum wheel based on relevance model

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specific Embodiment approach

[0043] The momentum wheel is a relatively independent electromechanical actuator. Its core is a high-speed rotating wheel body, which controls the star by changing the speed. Its functional modules are mainly divided into shell components, wheel components, bearing components, The motor components and circuit are composed, and the function of each functional module is shown in Table 1. Analyzing the relationship between each functional module, we can get figure 2 The correlation diagram of the function modules of the momentum wheel is shown.

[0044] Table 1 Momentum wheel function modules

[0045]

Embodiment approach

[0047] Through the failure mode effect analysis (FMEA, Failure Mode and Effect Analysis) of the momentum wheel, the typical failure mode set that occurs during the on-orbit and test phases is obtained as F={F 1 , F 2,…},As shown in table 2. The severity and probability of failure of the momentum wheel are determined according to the classification of severity and probability of failure in the aerospace field. The definition of failure severity and probability of occurrence in the aerospace field are shown in Table 3 and Table 4, respectively.

[0048] Table 2 Analysis of the influence of the failure mode of the momentum wheel

[0049]

[0050] Table 3 Definition of severity level

[0051]

[0052] Table 4. Definition of classification of failure probability

[0053]

[0054] Implementation of step (3):

[0055] Step (3) mainly establishes a correlation model, including the establishment of multi-signal flow graphs and the acquisition of fault-test correlation mat...

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Abstract

The invention discloses a method for determining the fault diagnosability of a momentum wheel based on a relevance model. The method comprises the following steps of: establishing an association relation diagram of functional modules of the momentum wheel; determining a momentum wheel fault mode set; obtaining a multi-signal flow diagram of the momentum wheel, and establishing a fault and test association matrix of the momentum wheel based on the multi-signal flow diagram; giving detectability and separability conditions corresponding to various faults of the momentum wheel based on the relevance model; and obtaining the fault detectability and separability of momentum wheel fault modes and parts by a diagnosability measurement calculation method. By the method, the detectability and separability of the momentum wheel fault modes are distinguished, and the diagnosability of the momentum wheel is measured.

Description

technical field [0001] The invention relates to a method for determining the diagnosability of a momentum wheel, in particular to a method for determining the diagnosability of a momentum wheel based on a correlation model, which belongs to the field of aerospace. Background technique [0002] As the inertial actuator of the spacecraft, the momentum wheel can not only output torque accurately and continuously, but also does not consume fuel, does not pollute optical equipment and the flight environment, and is not easy to stimulate the vibration of flexible accessories on the star, so it is the first choice for long-life satellites . At the same time, improving the failure response capability of the momentum wheel is also an important factor to ensure the safe and reliable operation of the spacecraft. [0003] The information used by the momentum wheel for fault diagnosis mainly includes shaft temperature, motor current, speed direction, speed signal and power switch status...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 王南华刘文静刘成瑞吕楠何英姿
Owner BEIJING INST OF CONTROL ENG
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