Transfer function-based method for determining failure diagnosticability of momentum wheel

Abstract

The invention discloses a transfer function-based method for determining the failure diagnosticability of a momentum wheel. The method comprises the following steps of: (1) on the basis of a momentum wheel model, adding failure influence of each functional module, and establishing a failure model of the momentum wheel; (2) obtaining a transfer function from each failure to output according to the failure model of the momentum wheel; (3) obtaining detectable conditions of various failures by judging whether the transfer functions from the failures to the output are 0 or not according to the transfer functions, obtaining separable conditions of various failures by judging whether the transfer functions corresponding to different failures are linearly dependent or not, and substituting relevant parameters of the momentum wheel to the detectable conditions and the separable conditions to obtain failure diagnosable analytic results of the momentum wheel; and (4) calculating the failure diagnosable analytic results by a diagnosable measurement calculation method to obtain the detectable degree and separable degree of a momentum wheel failure mode and the failure detectable degree and separable degree of components.

Description

technical field [0001] The invention relates to a method for determining the diagnosability of a momentum wheel fault, in particular to a method for determining the diagnosability of a momentum wheel fault based on a transfer function, which belongs to the field of aerospace fault diagnosis. 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. At present, the staff has set some measurement points for the momentum wheel to monitor the health of the momentum wheel, but whether these measure...

AI Technical Summary

Problems solved by technology

At present, the staff has set some measurement points for the momentum wheel to monitor the health of the momentum wheel, but whether these measurement points have covered all the failure modes considered, and whether it is necessary to optimize these measurement points or add new measurement points To achieve a certain diagnosability requirement, it is the content that the staff need to consider in the design stage, but there is currently no mature theory and method to guide the staff to analyze, and because the momentum wheel has established a relatively accurate quantitative model, Therefore, based on the momentum wheel model described by the state space expression, the present invention proposes a fault diagnosability analysis method based on transfer function, realizes the detectability and separability discrimination of functional module faults, and obtains the diagnosability of the momentum wheel Diagnostic Metrics

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